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What is Valve?

A valve is a device that has a mechanism that can open and close fluid passages in order to "Flow," "Stop," and "Squeeze" fluid. Fluid is a general term for liquids and gases, and is a substance that deforms freely when external force is applied to it.。

  • Flow
  • Stop
  • Squeeze

In our daily lives, we have familiar valves such as water faucets and gas valves. Valves are used in a variety of fields, including lifelines such as water and gas, power plants, factories, and ship transportation systems.

General Manufacturer of
Fluid Control Systems

Among a wide variety of valve manufacturers, NAKAKITA is a famous manufacturer in industrial fields such as ships, power plants, steelmaking, and chemicals. As a leading manufacturer of fluid control systems, we deliver world-class products such as butterfly valves and control valves, cylinder valves, regulating valves, safety valves, level switches, and remote control devices.

NAKAKITA's products
support ship transportation
Our main marine equipment includes valves for hull attitude control and cargo handling control, engine fuel temperature control and cooling control, measuring instruments and various devices, and control panels that automatically control them.
Control Equipment Measuring Instruments Valve
From Manufacturing and Sales
to After-sales Service.
NAKAKITA provides one-stop solutions, including regular inspections and maintenance of delivered equipment. We contribute to our customers' safe and secure flight operations with reliable after-sales service.

NAKAKITA's "Ballast Water Automatic Control System" boasts the world's No.1 market share

A ship's ballast water ensures the attitude control and stability of the ship, and is essential for the safe operation of the ship.NAKAKITA's "Ballast Water Automatic Control System" boasts the world's No.1 market share.*

*Share of large ship valves in major shipbuilding countries in 2008. According to our research based on data from the Japan Valve Manufacturers Association and the Japan Ship Machinery and Equipment Association.

Mechanism of hull attitude control - Tanker case

  1. 1. Ballast tanks are essential for the stability of ships.
    When a ship is empty, seawater is injected into the ballast tank as a weight to stabilize the ship. By injecting seawater into the ballast tanks, the ship's center of gravity is lowered and its tilt is corrected to maintain balance.
  2. 2.When a ship tilts due to cargo
    When crude oil is loaded into the loading area on the right side of a ship, the weight of the cargo causes the right side to drop.
  3. 3.Discharge seawater by detecting tilt
    When the sensor detects a tilt, the seawater pump and valve actuator pump operate to automatically open the valve connected to the ballast tank and drain the seawater.
  4. 4.Adjust hull attitude
    The right side of the ship is lighter, keeping the ship balanced.
  5. 5.Automatic adjustment of hull attitude
    The ship's attitude is automatically controlled according to the weight of the cargo.

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