FCI 70-2-2021

FCI 70-2-2021

Control Valve Seat Leakage



ANSI/FCI 70-2-2021 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 valves with "O" rings or similar gapless seals, among others.

Additional Info

Author Fluid Controls Institute
Published by FCI
Document type Standard
Theme /subgroups/17303
Number of pages 12
Replace FCI 70-2-2013,FCI 70-2-2006,FCI 70-2-2003
Keyword FCI 70-2-2021