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FCI 70-2

2013 Edition, 2013

Complete Document

Control Valve Seat Leakage

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Product Details:

  • Revision: 2013 Edition, 2013
  • Published Date: January 2013
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Fluid Controls Institute (FCI)
  • Page Count: 9
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:


Selection of a leakage class is not restricted as to valve design, but acceptable values for various commercially available designs are suggested for each class under Section 4. 

This standard applies to production tests and cannot be used as a basis for predicting leakage at conditions other than those specified and does not apply to valves with a Cv value less than 0.1. 

This standard is similar to IEC 60534-4, except that no provision is made for Class IV-S1.


This standard establishes a series of seat leakage classes for control valves and defines production test procedures.