FCV for Onshore Use / Butterfly Valves 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 Nakakita's butterfly valves 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. ■Concentric Type Eccentric type Concentric type ■Rubber Seat ■Resin Seat ■Metal Seat ■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 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. Main Unit Seat Part Stem Taper pins Body Disc Seat Bonnet Concentric type Eccentric (double eccentric) type 9 NAKAKITA FCV PRODUCT CATALOG
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