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About This Item

 

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 valves with "O" rings or similar gapless seals, among others.
 

Document History

  1. FCI 70-2-2021


    Control Valve Seat Leakage

    • Most Recent
  2. FCI 70-2-2013


    Control Valve Seat Leakage

    • Historical Version
  3. FCI 70-2-2006


    Control Valve Seat Leakage

    • Historical Version
  4. FCI 70-2-2003

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    Control Valve Seat Leakage

    • Historical Version