Valve Remote Control System for Offshore Use NAKAKITA PRODUCT CATALOG
VRCS for Offshore Use / Message 1 NAKAKITA VRCS PRODUCT CATALOG Valve Remote Control System Control Valve Butterfly Valve After-sales Service Level Measuring System Regulating Valve Moving forward Nakakita's fluid control systems have been employed in large ships, power generation facilities, and various plants, contributing greatly to the development of Japan's economy and social infrastructure. For large commercial transport vessels, we have continued to provide total systems for safe and efficient operation, including fluid control centered on valves, attitude control, and cargo handling control.
Butterfly Valves (Hydraulic) Mixing Valves 2 NAKAKITA VRCS PRODUCT CATALOG Conventional Control Console
3 This system consists of a hydraulic generator and a hydraulic directional control valve for remotely operating a hydraulically or pneumatically driven valve, and valve position signals can be indicated on a control console for remote control. Various combinations of valve operation, control, and indication methods, as well as hydraulic generators and directional control valves, can be customized. This valve controls uid ow (closure/ ow control) by means of a valve disk rotating at 90° inside a cylindrical valve body. Compared to gate valves or globe valves, this valve is lighter and more compact, with a smaller face-to-face dimension. The valve seat is easy to replace and does not require any lapping work. Valve Remote Control System for Offshore Use VRCS Nakakita's valve remote control system (VRCS) for offshore use consists of electrical equipment, hydraulic or pneumatic equipment, and various valves, and integrates related equipment for operating and monitoring main valves and pumps, measuring main tank levels and ship's position, etc. to build an optimal remote and centralized control and monitoring system. The system streamlines cargo handling operations (quick and safe loading and unloading), reduces crew labor (manpower reduction and improvement of working conditions), and improves safety (prevention of oil mixing accidents due to human error, and avoidance of operational risks and cargo handling stoppage due to equipment failure). Tanker NAKAKITA VRCS PRODUCT CATALOG
4 This is a device that detects the liquid level of a tank in a vessel and provides remote indication of it, as well as alarm indication. Centralized control is provided for remote operation of valves, monitoring of liquid level, and starting/stopping of pumps. We can also exibly incorporate systems from other equipment manufacturers and output signals externally. This is used as a device to control the temperature, pressure, liquid level, viscosity, etc. of process uids to optimum values or as an indicating device for remote monitoring. Container Ship Bulk Carrier LNG Carrier NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Butterfly Valve ■Concentric Type Eccentric type Concentric type ■Rubber Seat ■Resin Seat ■Metal Seat ■Eccentric (Double Eccentric) Type Stem Taper pins Body Disc Seat Bonnet Concentric type Eccentric (double eccentric) type Features Features •The valve seat is tted into the inner surface of the body and the inner surface is covered, so that the body and the stem do not come in contact with the uid. •Compact, lightweight, small pressure drop, and easy ow rate adjustment. •Valve seat with elasticity and the best sealing performance. •Selectable from NBR, FKM, and EPDM materials according to application. •Both concentric and eccentric types are available (FKM is available only for the eccentric type). •PTFE (polytetra uoroethylene) is employed for superior chemical resistance. •The seat structure consists of a seat part and a retainer part, and only the PTFE seat can be replaced. •Only eccentric type is available. ・NBR (nitrile butadiene rubber): High nitrile content type with excellent oil resistance ・FKM ( uoro-rubber): Can be used for uids to which NBR cannot be applied, such as gasoline. ・EPDM (ethylene-propylene rubber): Excellent environmental resistance and can be used at relatively high temperatures Features of Nakakita's Butterfly Valves •Non-leak type (completely closed: depends on valve seat structure) • Low valve operating force •Lightweight and compact • High quality and high reliability due to mass-produced products • Usable in a temperature range from high to very low, depending on structure and material • Manual, hydraulic, pneumatic, and electric drives can be selected Butterfly valves, which control fluids, can be adapted to various situations by structuring them according to application. Nakakita's long years of experience and technical capabilities allow us to meet the requirements of each user's environment. A valve with a structure in which the disc's center of rotation and the seat surface are on the same line. A valve with a structure in which the seat surface and piping center are not located in line with the center of the disc's rotation. •Except in the fully closed position, the valve seat and disc do not come into contact with each other, reducing wear on the seat surface. •Valve seat material can be rubber, metal, and resin (PTFE) depending on the application (structure differs depending on the material). •When replacing the valve seat, only the seat part can be replaced (no need to disassemble the valve). •CR rubber can be used for lining the inner surface of the body (special speci cations). •Applicable over a wide temperature range from high to very low temperatures. •Can handle corrosive uids, including solvents, through material selection. •The sealing section is made in the shape of a lip to provide elasticity. •Minute scratches can be removed by polishing the sheet surface. •Fireproof structure. •Only eccentric type is available. 5 NAKAKITA VRCS PRODUCT CATALOG
Applicable Range of Valve Seat Material Butterfly Valve Standard Specifications List List of Drive Unit Specifications ◎：Optimal ＞ ○：Usable ＞ △：Usable under certain conditions ＞ ×：Not usable ／ ―：Not applicable Seat material Valve Type Drive unit Handle type Yoke bar type Low pressure type, medium pressure type,high pressure type Low pressure type, medium pressure type Fork lever Double cylinder Single cylinder Multi-turn Double cylinder Single cylinder Single-acting Single-acting Part-turn ER type SRJ type EM type TA2 type A900 type TA2 type A900 type Lever type Worm wheel type DRY SPACE DRY SPACE ON DECK DRY SPACE IN TANK DRY SPACE ON DECK DRY SPACE ON DECK IN TANK DRY SPACE ON DECK DRY SPACE DRY SPACE ON DECK DRY SPACE DRY SPACE ON DECK Type E Type B Type F IP66 IP68 IP68 Manual Hydraulic Electric Pneumatic Type Location Protection class Nominal size Design pressure Design temperature Allowable pipe ow velocity (liquid) Pressurization direction ( ow direction) Actuator Major uses NBR FKM EPDM PTFE Stainless steel Copper alloy Concentric type 50A to 800A 80A to 800A 65A to 800A 80A to 800A 80A to 800A 80A to 400A 200A to 400A 0 to 70°C 0 to 90°C 0 to 150°C –50 to +300°C 0 to 90°C –50 to +80°C –196 to +80°C 4m/sec 6m/sec 6m/sec 6m/sec Both directions Both directions Both directions Single directions Ballast fuel oil Insulation type Pneumatic Both directions (to the valve stem side is better) (to the valve stem side is better) (to the valve stem side) IC type (rubber seat) DR type (rubber seat) DT type (PTFE seat) DM type (metal seat) DD type (damper) DTP type (dual seat) DM400 type (metal seat) Manual Hydraulic Electric motor Pneumatic Manual Hydraulic Petroleum products Product chemicals Fire extinguishing, steam Discharge valve LPG LNG Double eccentric type Low temperature speci c type 1.0MPa 1.6MPa 1.0MPa 0 to 70 °C 0 to 90 °C 0 to 130 °C –50 to +150 °C –253 to +423 °C –196 to +100 °C Applicable temperature Fluid High flow velocity type available Freshwater Seawater Crude oil Heavy oil Diesel oil Kerosene Naphtha Gasoline Steam Fuel oil LPG LNG ◎ ◎ ◎ ◎ ○ ― ◎ ◎ ― ◎ ○ ○ ◎ ◎ × ○ △ ― ◎ ◎ × ○ ○ ― ◎ ◎ × ◎ ○ ― ◎ ◎ × ◎ ○ ― ◎ ◎ × ◎ ○ ― × ◎ × ◎ ○ ― △ △ ― ◎ ◎ ○ ◎ ◎ × ○ ○ ○ × × × ◎ ◎ ― × × × ○ ◎ ◎ Top handle type ■Electric Actuator ■Pneumatic Actuator •Drive unit operated by air pressure generated by compressor. •Remote operation is possible. •No hydraulic oil is used, so there is no need to bleed air, as is done with hydraulic systems. •Various controls are possible by installing instrumentation. ■Manual Actuator •Drive unit operated manually with a handle. •Can be operated while directly checking valve position. •Self-locking is possible, and the valve does not open under uid pressure. ■Hydraulic Actuator •Drive unit operated by hydraulic power generated by a hydraulic pump. •Remote operation is possible. •High-pressure operation allows for a smaller cylinder section. •Can be installed anywhere on board, including submerged environments. •A mechanical lock prevents the valve from opening from its fully closed position under uid pressure. •Drive unit powered by an electric motor in the unit. •Remote operation is possible. •A limit switch/torque switch is provided as standard. •Protection class: Capable of meeting IP68 (immersion conditions: 8 m × 72 hours). •Self-locking is possible, and the valve does not open under uid pressure 6 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Operating Systems (Hydraulic and Pneumatic Equipment) MIMIC DIAGRAM STARTER PANEL ELECTRIC MOTER DIRECT TYPE VALVE POSI.TRAMS. HYD.POWER UNIT CONSOLE ELEC.OPERATED B.T.F.V. HYD.OPERATED B.T.F.V. （DOUBLE CYLINDER TYPE） HYD.OPERATED B.T.F.V. （SINGLE CYLINDER TYPE） SELF-SEAL COUPLING BLOCK PRESSURE RANGE SOLENOID VALVE BOX LOW MID. HIGH PRESS.: PRESS.: PRESS.: 6.9MPa（ 70K）. 9.8MPa（100K）. 13.7MPa（140K）. 5.0‒ 8.0‒ 12.0‒ 6.0MPa 9.0MPa 13.0MPa MAX. NOR. CONSOLE EMERG.HAND PUMP SOLENOID VALVE BOARD CONTROL CONSOLE I.S.BARRIER PANEL FOR VRCS DRY SPACE DRY SPACE DRY SPACE DRY SPACE IN TK. IN TK. IN TK. ON DK. SYMBOL :HYD.OIL LINE :ELECTRIC LINE The following systems are standard products. We can also build a system according to your requirements. Various combinations of valve operation, valve control, and valve indication methods, as well as hydraulic generators and hydraulic directional control valves, are available. The hydraulically driven valve can be remotely operated from a separate place such as a cabin by sending an electric signal to the solenoid valve from an operating switch on the control console to switch the direction of hydraulic pressure ow. The valve position can be remotely monitored by an in-line ow meter or a directly attached transmitter. Valve operation method Explosion-proof/ non-explosion-proof Hydraulic symbols Valve indication method Valve control method The hydraulically driven valve can be remotely operated from the equipment side by switching the hydraulic ow direction through local, manual operation of the hydraulic directional control valve. The valve position can be checked at the equipment side with an in-line ow meter. #1. In-line ow meter with a potentiometer. #2. In-line ow meter with a micro switch. #3. In-line ow meter with no electric device. ※1 ※2 ※3 ※3 Hydraulic Remote System (with a Remote Solenoid Valve) Hydraulic Remote System (with a Local Manual Valve) MANUAL VALVE SOLENOID VALVE Explosion-proof type/Non-explosion-proof type Non-explosion-proof type In-line flow meter type In-line flow meter type Transmitter type directly attached to a valve In-line flow meter type Transmitter type directly attached to a valve In-line flow meter type MANUAL VALVE VALVE POSITION INDICATOR SELF-SEAL COUPLING SOLENOID VALVE SOLENOID VALVE （P-PORT BLOCK） SOLENOID VALVE （ALL-PORT BLOCK） PILOT CHECK VALVE WITH RELIEF VALVE MANUAL VALVE （P-PORT BLOCK） MANUAL VALVE （ALL-PORT BLOCK） PILOT CHECK VALVE WITH RELIEF VALVE DIRECT TYPE DIRECT TYPE WITH POTENTIO METER WITH MICRO SWITCH VALVE POSITION TRANSMITTER SELF-SEAL COUPLING This is a method of adjusting the valve position as desired. This is a method to operate the valve either fully open or fully closed only. Three-position operation (free valve position type) This is a method of adjusting the valve position as desired. Three-position operation (free valve position type) Two-position operation (open/close type) This is a method to operate the valve either fully open or fully closed only. Two-position operation (open/close type) (Hydraulic and Pneumatic Equipment) Our hydraulically or pneumatically driven valve can be remotely operated from a control console or from equipment. For example, in the case of remote solenoid operation of a hydraulically driven butterfly valve, hydraulic pressure is generated by a hydraulic generator, and the valve is opened or closed by switching the pressure supply direction to the open or closed side of the drive unit (hydraulic cylinder) using a hydraulic directional control valve. The valve position signal is output to the control console for remote direction. 7 NAKAKITA VRCS PRODUCT CATALOG
■Variable-volume Piston Pump Unit ■Indoor Installation Type (Unit) ■Explosion-proof Type Driven by the rotary motion of an electric motor, this pump has a mechanism that automatically adjusts the discharge volume according to the pressure in the hydraulic piping. When the pump discharge pressure approaches the set pressure, the discharge volume is automatically reduced to the minimum volume required to maintain the hydraulic pressure. The discharge pressure and discharge volume are adjustable. Supplying air pressure to the air motor causes the hydraulic cylinder to reciprocate and generate hydraulic pressure. This hand pump is used to generate hydraulic pressure by reciprocating a hydraulic cylinder through manual operation of the handle. It is mainly used in emergencies, such as when the hydraulically driven valve cannot be operated due to electrical or hydraulic line problems. One-touch couplings allow quick connection. This is used to generate hydraulic pressure with a gear pump driven by manual operation of the handle. Since it is mainly installed on deck and operated manually, it is applied to valves that are operated infrequently. Driven by the rotary motion of an electric motor, as the vane passes the cam ring surface, the discharge volume goes from minimum to maximum in the suction process and from maximum to minimum in the discharge process, thus discharging a continuous ow of oil. Consisting of a vane pump, accumulator, and unload valve, it performs repeated load/no-load operation to maintain hydraulic pressure. ■Fixed-volume Vane Pump Unit Customized shapes, pipe directions, ttings, and paint colors are available upon request to meet installation conditions and applications. ■Hand Pump ■MH Operator ■Pneumatic Piston Pump Unit ■ Nakakita also offers explosion-proof equipment for special environments. The use of electrical equipment is restricted from explosion protection standpoints on ships (oil tankers, LNG carriers, etc.) that handle ammable uids such as crude oil and natural gas. Our intrinsically safe explosion-proof equipment has obtained the IECEx explosion-proof certi cation, which enables the installation of electrical equipment in each hazardous compartment, such as exposure decks and pump rooms. Outdoor Installation Type (Wave Resistant Box) 8 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Operating Systems (Pneumatic and Electric Type) Please contact us for more information. •No hydraulic oil is used, resulting in a low environmental impact. •No piping installation required, allowing system construction using only electrical wires (reduction of piping material costs/reduction of piping man-hours). •Simpli ed maintenance (no need for uid replenishment/replacement or uid quality control). •Space-saving for control equipment layout. •Valve open/close time is xed, so no adjustment is required. •No hydraulic oil is used, resulting in a low environmental impact. •No piping installation required, allowing system construction using only electrical wires. •Simpli ed maintenance (no need for uid replenishment/replacement or uid quality control). •Valve switching device is smaller and lighter than a hydraulic system. VALVE CONTROL PANEL ELECTRIC SIGNAL COMPRESSED AIR AIR SUPPLY UNIT SUPPLY AIR LINE CONTROL AIR LINE AIR OPERATED B.T.F.V. SOLENOID VALVE UNIT VALVE CONTROL PANEL ELECTRIC SIGNAL / POWER SOURCE ELECTRIC OPERATED B.T.F.V. Features Features (Pneumatic and Electric Type) In addition to hydraulic systems, we also offer a lineup of other drive systems. 9 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Operating Systems (Electric Equipment) It features piping graphics for operating valves, various gauges, and pump start/stop status, etc., which can be viewed in their entirety. There are four main types of piping graphics: acrylic, back engraving, lm, and lm + acrylic. •Valve opening/closing is operated by pushbutton. •An analog or digital indicator is used for liquid level gauge indication. •Pump start/stop is operated by pushbutton. •An analog indicator is used for pump pressure monitoring. •Valve opening/closing is operated from a monitor. •Liquid level gauge is indicated on a monitor. •Pump start/stop is operated from a monitor. •Pump pressure is displayed on a monitor. This system is designed to remotely operate valves for cargo ballast control and start/stop pumps from piping graphics displayed on the LCD. The system is compatible with full HD widescreen monitors and is capable of a four-way split screen; it can also print and save data to a USB memory device. This is a valve remote control system using a touch panel and PLC. Control through screen operation enables centralized grasp of information and visualization of operating conditions, thereby automating vessel control, improving work ef ciency, and supporting various monitoring activities. 特 徴 •Valve opening/closing is operated from a monitor. •Liquid level gauge is indicated on a monitor. •Pump start/stop is operated from a monitor. •Pump pressure is displayed on a monitor. •Faster data processing speeds provide speedy screen display and comfortable operability. •Operation is possible in the same way as the conventional type, but with greater operational safety. •Dual CPU backup system ensures system operation even in the case of a CPU malfunction (optional). •The progress of loading/unloading operation is noti ed by voice guidance in an easy-to-understand manner (optional). Space Saving Reduced Wiring Low-cost Introduction Labor Saving Example of the operation screen Features Features Features (Electric Equipment) This system can be used to remotely operate butterfly valves, monitor tank levels, remotely start/stop pumps, monitor pressure, and monitor systems from other equipment manufacturers. Our control consoles are available in conventional and computerized versions. Unlike ordinary control consoles that use push-button switches, this control panel is extremely compact and can be installed in rooms where installation space is limited. Since each signal is controlled in the PLC all at once and transmitted to the control panel by communication lines; man hours for installation cables can be reduced. Remote control and remote monitoring of valves and pumps can be performed using a single screen, saving labor. The use of touch panels and PLCs enables low-cost introduction due to downsizing of control panels and reduction of wiring man hours. 10 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / VRCS Optional Functions list •Emergency shutdown system to quickly and safely stop cargo operations of LNG/LPG carriers in the event of a re, hydraulic or pneumatic pressure drop, power failure, or other problems. • Automatically closes manifold valves and controls pump and compressor shutdown. • The system's construction is based on operational requirements for emergency shutdowns. ①The valve is open and the ship and land are connected. ②The emergency shutdown system is activated and the valve is closed, disconnecting the ship from land. •During loading and unloading, a voice noti es the operator when the tank level reaches the set range. • Customization is possible by selecting voice content, switching between male/female voices, etc. • It is possible to import liquid level information not only from our liquid level measurement systems, but also from those made by other equipment manufacturers. (Signal types: 4–20 mA, RS232C, RS485, etc.) ! Revolving Light Speaker CONTROLPANEL VALVE ELEC. SIGNAL CONTROL AIR LINE 11 NAKAKITA VRCS PRODUCT CATALOG
•This system automatically adjusts ship heels during cargo operations or boarding (automatic heel control). • The system automatically adjusts ship trims (inclination in the direction of bow/stern) (automatic trim control). ＊It optimizes the ship's attitude and improves fuel ef ciency. (＊Manual operation is also possible during the process.) ①A ship is tilting. •This supports operations during loading and unloading on tanker vessels operating domestically. • We can customize a system to make it easy for the shipowner or operator to use. For example, the system automatically starts operation when the order of loading and unloading to the manifold (connecting fueling port) and each tank is selected. Butter y Valve Ballast Tank Cross-sectional View of Hull Loading Area Loading Area ②The ship leveled off. The right side of the ship is lighter and the hull is balanced. 操作画面イメージ 1. Automatic heel control 2. Automatic trim control 3. Automatic closing control of ballast tank pour/drain valve Loading Area Butter y Valve 12 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Level Measuring System Control air supplied from the air supply unit is sent to the air purge unit in each tank and comes out of the purge mouth at the tip as bubbles via an ori ce in the unit. At this time, the pressure P in the purge mouth is equal to the value obtained by multiplying the liquid level gauge height H by the speci c gravity of the liquid γ. This is a measurement method that remotely indicates pressure measured at a depth in a pipe on an indicator. •Since no electrical equipment is used in the vicinity of each tank, explosion-proo ng considerations are not required. •Easy to understand and easy to maintain and inspect because of the application of simple principles. •High service life due to mechanical principle. •The lineup includes a all-pneumatic type and a pneumatic-to-electric conversion type. Float Magnet Guidepipe Reed Switch In principle, this type opens and closes reed switches by magnetic force provided inside the oat. Mounting multiple reed switches inside the guidepipe results in conversion to sequential electrical signals. A single-point reed switch type for bilge detection, fuel tank high liquid level alarm, etc. can also be supported. •Highly accurate. •Mainly used for fuel tanks. •Can be used for cargo tanks of oil tankers and chemical tankers. JOINT BOX AIR SUPPLY LINE AIR PURGE PIPE TANK (WBT/FWT/ DWT/FOT/ DOT/MGOT) PRESSURE-ELECTRIC SENSOR AIR SIGNAL LINE MAGNETIC FLOAT SENSOR FLOAT TYPE (ADDITIONAL TANK:COT) GAUGE BOARD / CONTROL PANEL AIR PURGE UNIT ELECTRIC SIGNAL ELECTRIC SIGNAL LEVEL MEASURING SYSTEM NAKAKITA LEVEL GAUGE m This system detects the liquid level of water ballast tanks (W.B.T.), fresh water tanks (F.W.T./D.W.T.), and fuel oil tanks (F.O.T./D.O.T./M.G.O.T.) on ships and remotely indicates these liquid levels. Draft measurement is also possible. Features Features •Capable of measuring liquid levels in tanks up to 35 m high. •Capable of high and low liquid level alarms as well as indication. •Remote indication enables streamlining of loading and unloading operations with a small number of workers. •Supports speci c gravity correction and trim/heel correction (depending on the type of equipment). 13 NAKAKITA VRCS PRODUCT CATALOG
The 2004 revision of the SOLAS Convention requires bulk carriers and other vessels to be equipped with a water ingress alarm system. Our system applies liquid-level indicator technology to detect the water level and is sold as an integrated system from sensor to alarm panel. •Compatible with various ship classi cations (NK, ABS, BV, DNV-GL). Type approval obtained. •MED (Marine Equipment Directive) certi ed for European ship registry. •JG ship classi cation compatible with ferries and other vessels (requires JG witness inspection). •It consists of a control panel that controls sensors, barriers, and alarm circuits for detection, and an alarm panel mounted in the wheelhouse. •A valve remote device drainage system for the bow compartment is installed in conjunction with a water ingress alarm system (such as IP68 electric valves and air-acting piston pump-type hydraulic valves). •Explosion-proof grade (Exia IIC T6) compliant (explosion-proof is not required for air-purged type). •Equipped with fail-safe function for self-diagnosis of malfunctions. This sensor can be installed either inside or outside a tank. In principle, the sensor directly detects the static pressure (P: pressure measured at a depth) of the liquid. As with the air purge type, the pressure P is equal to the value obtained by multiplying the liquid level gauge height H by the speci c gravity of the liquid γ. The sensor detects the static pressure of the liquid with an internal pressure-sensitive element and converts it into an electrical signal. This electrical signal is ampli ed and adjusted by the internal circuit •No air piping is required, making it easy to secure space inside the control panel. •Since it uses electrical signals, it is easy to connect to LCD, PLC, and touch panels. •Can be used with tanks that are dif cult to use with the air purge type, such as fresh water tanks. •This sensor is intrinsically safe and can be used in hazardous areas. Float Type Air Purge Type Impedance Type Pressure Type ALARM PANEL CONTROL PANEL SENSOR ・CONVERTER ・ANNUNCIATOR UNIT ・DC POWER SOURCE BARRIER PANEL WATER INGRESS ALARM SYSTEM Features Features of the sensor, and the raw sensor signal of 4–20 mA DC is transmitted as a current signal to an insulation transducer and an indicator. The cable used between the sensor and the junction box is a special cable with a built-in air tube, and through the atmospheric opening of the junction box, atmospheric pressure is always applied to the back pressure of the pressure-sensitive element in the sensor to automatically compensate for errors caused by atmospheric pressure uctuations. 14 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / Control Valves and Automatic Control Equipment They are used as the main control valves and indicating controllers for engine rooms. They are used in cooling systems for fresh water, seawater, and lubricating oil, and in heating systems for fuel oil and lubricating oil using steam to automatically control each process. ■Main Applications in the Engine Room ■Example of Use of Electric Control Valves and Controllers Combined use of a control valve and an indicating controller results in a pneumatic (or electric) automatic control equipment that automatically controls all measured values of temperature, pressure, liquid level, viscosity, etc. of a process fluid to the optimum values. Some automatic control equipment is also used in the application of indicating equipment for remote monitoring. Red text: Nakakita's production range Red text: Nakakita's production range Electric Valve Console Steam AC220V 60Hz AC220V 60Hz AC220V 60Hz 4 to 20 mA DC 4 to 20 mA DC 4 to 20 mA DC 4 to 20 mA DC Main Engine Electric Viscosity Controller Data Logger Data Logger Electric Temperature Controller Alarm Select Switch Control Arithmetic Circuit Box NS904C Vibration Type Viscosity Detector (NS904S) Resistance Thermometer 燃料油 清浄器 Steam Supply Air Pump Pump Pump Supply Air Supply Air Supply Air Heater Steam Steam Exhaust Gas Heavy Fuel Oil C Heavy Fuel Oil A Supply Air Heater Cooler Fresh Water Outboard Seawater Outboard Supply Air To each equipment Fuel Oil Purifier Fuel Oil Tank Boiler Condenser Pump Main Engine Heater Heater Supply Air Fuel Oil Pressure Control Valve Fuel Oil Puri er Temperature Control Valve Temperature Indicating Controller NSTN732 Excess Steam Treatment Valve Heavy Fuel Oil A / Heavy Fuel Oil C Changeover Valve Fuel Oil Heater Temperature Control Valve Main Engine Cooling Seawater Temperature Control Valve Main Engine Cooling Fresh Water Temperature Control Valve Steam Pressure Reducing Valve Pressure Indicating Controller NSPS732 Pressure Indicating Controller NSPS732 Pressure Indicating Controller NSPS732 Pressure Indicating Controller NSPS732 Pressure Indicating Controller NSPS732 Viscosity Indicating Controller NSVBT732 Small Tube Viscosity Transmitter NS777C 15 NAKAKITA VRCS PRODUCT CATALOG
This is used by attaching a drive unit operated by a control pneumatic signal (or electrical signal) to the main unit, which has valve opening position and ow rate characteristics depending on the shape of the internal valve. The valve opening position is adjusted according to the control signal to control the process uid. ■DY-GOZ Two-way Single-seated Control Valve Three-way Control Valve Three-way Rotary Mixing Control Valve ■DY-T ■DY-M This is mainly used as a steam control valve for heaters to control the temperature of fuel oil, lubricating oil, etc. The speci cations of the inner valve are selected according to the conditions of use. This is mainly used to control the temperature of fresh water and lubricating oil supplied to the main engine of diesel engines and power generation engines. ■MV-GOZ ■MV-M This is a valve with an electric motor which drives the two-way single-seated control valve DY-GOZ; it is mainly used as a steam control valve for heaters. This is a valve with an electric motor which drives the three-way rotary mixing control valve DY-M; it is mainly used as a temperature control valve for fresh water and lubricating oil. This is a three-way control valve with a rotary-type structure that changes the ow path by rotation of the valve disc, making it ideal for large-capacity, large-diameter applications. For corrosive uids such as seawater, a corrosion-resistant rubber lining or coating can be applied to the inside of the body. Main unit type Pressure Rating Nominal size Main unit standard material Flow characteristics Rangeability Leakage when fully closed Single-seated globe valve JIS 5K to 20K; ANSI 125 to 300 15A, 20A, 25A FC200, SCPH2 Equal percentage 20:1 to 30:1 0.01% or less of rated Cv Main unit type Pressure Rating Nominal size Main unit standard material Flow characteristics Rangeability Leakage when fully closed Three-way rotary valve JIS 5K, 10K; ANSI 125, 150 80A to 650A FC200, SCPH2 Linear 30:1 2% or less of rated Cv Main unit type Pressure Rating Nominal size Main unit standard material Flow characteristics Rangeability Leakage when fully closed Three-way single-seated valve JIS 5K, 10K; ANSI 125, 150 25A to 300A FC200, SCPH2 Linear 30:1 0.1% or less of rated Cv Two-way Single-seated Control Valve Three-way Rotary Mixing Control Valve 16 NAKAKITA VRCS PRODUCT CATALOG
特 徴 By combining several pressure (temperature) transmitters into a unit, it can be used as an indicator device to detect and remotely monitor the operating pressure (supply, discharge, drive, etc.) of cargo oil pumps and ballast pumps as part of VRCS. Three models are available according to the detection method, making it possible to handle a variety of process uids. Since they are pneumatic devices, they can be installed in hazardous areas. It detects the temperature, pressure, liquid level, viscosity, etc. of a process uid and outputs them as a control signal or transmission signal. The signals are used for various applications such as control of valves and monitoring of detected values. ■NS732 ■NS777 ■NS904 In addition to temperature and pressure, this pneumatic indicating controller can be used for all kinds of control, including liquid level and viscosity, depending on the combination with a transmitter, and outputs a signal to automatically adjust the control object to the optimum value. It is designed for easy operation, handling, and maintenance, and has been used for a long time. ■Electric Controller Compatible with various types of input signals and capable of outputting control signals (4–20 mA) as well as alarms, etc., this controller is equipped with a wide variety of functions. In addition to mounting on a console, it can also be installed in a control box for delivery. This is a viscosity transmitter based on the principle that uid viscosity is directly proportional to the differential pressure generated at the front and back of the inner small tube. Viscosity is continuously detected as differential pressure, converted into a pneumatic or electrical signal, and transmitted. In recent years, environmental regulations have made it more important to control viscosity, and this device can be used to detect low-viscosity uids. This is an electric viscosity transmitter based on the principle of vibration. By using a piezoelectric element to which an electric signal is applied to generate torsional vibration in the detector, changes in viscous resistance due to the uid are detected and viscosity is measured. This model can also be used to detect low viscosity uids. Nominal size Pressure rating Main unit standard material Rated pressure Fluid temperature Output signal Standard measurement range Detection accuracy Minimum detectable viscosity Response time Mass 40A, 50A, 65A, 80A JIS 5K to 20K; ANSI 125 to 300 FCD400, SCPH2 2.0 MPa Max.180 °C 4 to 20 mA 0 to 30, 40, 50 mm2/s Within 2% of total scale width 0 mm2/s Approx. 5.0 sec Approx. 12 kg Nominal size Pressure rating Main unit standard material Rated pressure Fluid temperature Output signal Standard measurement range Detection accuracy Minimum detectable viscosity Response time Mass 40A, 50A, 65A, 80A JIS 5K to 20K; ANSI 125 to 300 FCD400, SCPH2 2.0 MPa Max. 200 °C 20 to 100 kPa or 4 to 20 mA 0 to 30, 40, 50 mm2/s Within 1% of total scale width 2 mm2/s Approx. 2.6 sec Approx. 47.4 kg Operating air pressure (output) Control action Detection accuracy Control target Standard measuring range Mass 20 to 100 kPa PI action, PID action Within 1% of total scale width Temperature, pressure, viscosity, liquid level, differential pressure 0 to 100, 150, 200, 300 °C 0 to 0.3, 0.5, 1, 1.5, 2, 3, 5 MPa –10 to 20, 40 kPa, etc. 5 kg (Temp. controller: 6 kg) Output signal Detection accuracy Detection target Standard measurement range Additional specifications for pressure detection 20 to 100 kPa Within 1% of total scale width Temperature, pressure 0 to 100, 150, 200, 300 °C 0 to 0.3, 0.5, 1, 1.5, 2, 2.5, 3, 5, 10 MPa –760 mmHg to 0.3, 0.4, 0.5 MPa, etc. Diaphragm seal type, Reed diaphragm seal type VRCS for Offshore Use / Control Valves and Automatic Control Equipment Indicating Controller Small Tube Viscosity Transmitter Vibrating Viscosity Transmitter 17 NAKAKITA VRCS PRODUCT CATALOG
We have been supplying low-temperature valves for more than 60 years; we have also delivered many valves used for LNG cargo line in marine vessels. We also have experience in manufacturing valves for ammonia and hydrogen, which are next-generation fuels, for land-based plants under various conditions, and can respond exibly to customer needs. ■Example of LNG Fuel Gas Supply System ■Specifications of Automatic Valves and Safety Valves for LNG Note. Speci cations Pressure rating Temperature Valve connection Material Bore size 150 Lb, 300 Lb 1500 Lb, 2500 Lb R.T. to –163 °C Flange, welding SCS14A, SCS16A 15A to 200A 150 Lb, 300 Lb 1500 Lb, 2500 Lb R.T. to –163 °C Flange, welding SCS14A, SCS16A 20A to 200A 150 Lb, 300 Lb — R.T. to –163 °C Flange, welding SCS14A, SCS16A 15A to 200A Standard type High pressure type Control valve, shuto valve Pressure regulating valve Safety valve Vaporizer or Heater LNG Tank VRCS for Offshore Use / Automatic control valve and safety valves for FGSS Demand for low-temperature valves is increasing as LNG-fueled vessels become more prevalent due to stricter environmental regulations in recent years. The following is a list of examples of applications of our automatic valves and safety valves for FGSS of LNG-fueled vessels and their main valve specifications. Main Engine Power Generation Engine Pressure Control Valve Pressure Regulating Valve Pressure Regulating Valve NG Service / NG Line NG Service / NG Line Shutoff Valve Shutoff Valve Safety Valve Safety Valve Flow Control Valve Pressure Control Valve Flow Control Valve Compliant with the IGF Code and applicable to various types of ship classi cation. The valves may be used outside of the ranges listed above, so please consult us. We can also provide valves for next-generation fuels such as ammonia and hydrogen, so please contact us with your speci cation requirements. 18 NAKAKITA VRCS PRODUCT CATALOG
VRCS for Offshore Use / After-sales Service Parts Supply Visit & Repair Support Desk Maintenance & Diagnosis Technical Guidance Prevention & Maintenance For after-sales service and various inquiries about our products, please contact our sales offices at each location ■Nakakita's One-stop Maintenance Nakakita is not just a manufacturer of valves and other equipment. We offer operator training prior to equipment delivery, as well as proposals for further improvement of proficiency and improved operation of the delivered equipment. We also hold technical workshops and exchange meetings for the purpose of preventive maintenance in response to customer requests. Various Support for Your Needs from Pre-Delivery Support to Improvement Proposals We have established a full support system to ensure the stable operation of delivered equipment, including the establishment of a support desk, a reliable parts supply system, and a system for dispatching engineers. Reliable Customer Support Click here to contact us for more information. ● Inquiry Form on Our Website We provide one-stop operational support for reliable after-sales service, maintenance, diagnosis, renewal, and engineering of equipment by making full use of our solid onsite capabilities based on our long-cultivated experience and know-how. Operator Training Improved Operation of Delivered Equipment Technical Workshops and Exchange Meetings 81-72-871-1341 TEL ●Head Office (Osaka) 81-3-4212-6315 TEL ●Tokyo Office 81-93-531-5481 TEL ●Kitakyushu Office O n e - s t o p Maintenance 19 NAKAKITA VRCS PRODUCT CATALOG
n. Osaka Head Office & Factory, Tokyo Office, Kitakyushu Office ●Domestic Offices ●After-sales Service Centers We have domestic and international distributors with service personnel on staff. Please contact our sales representatives. Osaka Head Office & Factory ■Illustration of Hydrogen Supply Chain with Liquefied Hydrogen Carrier Our Initiatives for Valves for Ultra-low Temperature Applications History Butterfly valve for liquefied hydrogen with vacuum jacket (prototype for testing with LH2) Control valve for ultra-low temperature with vacuum jacket Butterfly valve for ultra-low temperature for LNG Control valve for highpressure and ultra-low temperature for LNG Since the 1970s, we have delivered more than 1,400 valves for ultra-low temperature applications using LH2, LNG, LN2, etc., including rocket fuels. We have also manufactured regulating or shutoff globe valves with vacuum jackets to reduce thermal ingress. From 2020, we have developed the "Technological Development of Large Butterfly Valve for Liquefied Hydrogen" jointly with the Japan Aerospace Exploration Agency (JAXA), with funding from the New Energy and Industrial Technology Development Organization (NEDO). Through product development, we will contribute to the development of supply chains for power generation and other large-scale applications toward the realization of a hydrogen society in the future. Developed control valves and shutoff valves for liquefied hydrogen used in rocket fuel supply lines. From 1970 Developed butterfly valves for low-temperature uses on LPG carriers. Developed large-bore, globe control valves for air separation equipment facilities. Developed safety valves and self-operated valves for LNG facilities. Started manufacturing and sales of butterfly valves for LNG carriers (business tie-up with Sasakura Engineering Co., Ltd.). Developed control valves for LNG carrier regasification systems. Conducted NEDO project "Technological Development of Large Bore Butterfly Valve for Liquefied Hydrogen" jointly with Japan Aerospace Exploration Agency (JAXA). Production Transportation Storage Use Liquefaction /shipping base Valves for liquefied hydrogen Receiving terminal Hydrogen power plant Liquefied hydrogen carrier From 1980 From 1994 From 2005 From 2020 20 NAKAKITA VRCS PRODUCT CATALOG
Head Office and Factory 1-1 Fukonominami-cho, Daito-shi, Osaka 574-8691, Japan TEL: +81-72-871-1331 (main) / +81-72-871-7871 (sales) / +81-72-871-1341 (sales) FAX: +81-72-870-1865 Tokyo Office Pier City Shibaura Building 3F, 3-18-1 Kaigan, Minato-ku, Tokyo 108-0022, Japan TEL: +81-3-4212-6315 FAX: +81-3-4212-8880 Kitakyushu Office Kokura Kosan KMM Building Annex #416, 2-11-15 Asano, Kokurakita-ku, Kitakyushu-shi, Fukuoka 802-0001, Japan TEL: +81-93-531-5481 FAX: +81-93-521-4993 Sales and Service Offices URL：https://www.nakakita-s.co.jp/en Company Overview Trade Name: Nakakita Seisakusho Co., Ltd. Foundation: May 28, 1930 Representative Director: Teruhisa Miyata Business: Manufacturing and sales of automatic control valves, butter y valves, and remote control devices ●Click here to check our overseas distributors or contact us for more information. Inquiry Form on Our Website
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