Non-peeling Seat-to-body Construction Molded-in (bonded) seat structure is employed for size 2 to 12. Larger sized valves are provided with replaceable seat. This non-peeling seat-to-body construction assures maintenance-free application for high fluid velocity service*1, vacuum service*2 and handling surging fluid velocity. It also guarantees peel-free valve mounting on pipelines. *1 Maximum 4 meters/second for on-off service for valves up to size 12, and 3 meters/second for size 14 and larger. *2 Up to 30 torr. Vacuum service is option for size 14 and larger. Spherical design for Discs and Seats Rubber seats are spherically designed where they contact top and bottom stems. This protects widely designed rubber seats from peeling or deformation for prolonged service life of valves. Thinly streamlined metal discs are the results of elaborate laboratory study to ultimately minimize the pressure loss. Choice of Materials and Operating Devices Choice among 4 disc and 2 seat materials and manual, pneumatic or electric valve operating devices makes service applications highly versatile.
Integral ISO 5211 Actuator Mounting Flange Any pneumatic or electric valve actuators provided with ISO 5211 valve mounting flanges can be easily mounted for actuation of valves in the field. Low Valve Operating Torque Low operating torques are designed low for extension of valve service life and economic consideration in selection of valve operating devices. Light-designed for Operation Efficiency Designed much lighter than our conventional series for operation efficiency in piping Emission-free Stem Sealing Mechanism Prevention of external fluid leakage is maximized with a rubber O-ring assembled around the top stem and tight contact between spherically designed rubber seat and spherically designed top and bottom end of the disc. Dew condenstation prevention Dew condenstation prevention type is optionally available with heat insulating plate (size 2 to 6) or stainless steel stand (size 8 to 24).