FCI 70-2-2003

FCI 70-2-2003
FCI 70-2-2003 English Secure PDF Control Valve Seat Leakage

standard published 10/09/2003 by Fluid Controls Institute

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Full Description

This standard establishes six classes of seat leakage for control valves. Also defined are specific test procedures to determine the appropriate class. Included are classes commonly associated with double-port, double-seat or balanced single-port control valves with a piston ring seal or metal-to-metal seats; commercial unbalanced single-port, single-seat and balanced single-port valves with extra tight piston rings or other sealing means and metal-to-metal seats; valves for critical applications where the control valve may be required to be closed, without a blocking valve, for long period of time; and resilient seating control valveswith "O" rings or similar gapless seals, among others.

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