ANSI/FCI 70-2-2006
AMERICAN NATIONAL STANDARD
CONTROL VALVE SEAT LEAKAGE
Fluid Controls Institute, Inc.
Sponsor:
Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio 44115-2851ANSI/FCI 70-2-2006
AMERICAN NATIONAL STANDARD
Control Valve Seat Leakage
Sponsor
Fluid Controls Institute, Inc.
ii
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iiiCONTENTS PAGE
Foreword ..................... v
1. Purpose ................. 1
2. Scope and Limitations ............... 1
3. Definitions.................... 1
4. Leakage Specifications and Classes................ 1-2
5. Test Procedures................... 2-4
6. References.................... 4
Tables
Table ? ... 2
Table ? ... 3
iv
Foreword (This foreword is included for information only and is not part of ANSI/FCI 70-2-2006, Control Valve Seat
Leakage.)
This voluntary standard has been compiled and issued in the public interest. It is intended to
eliminate present misunderstandings and to assist and guide those people involved in the
specification, use or manufacture of control valves.
This standard, formerly known as ASME B16.104, was originally adopted on November 24,
1970 as FCI 70-2.
The standard has been revised several times through the years to stay current as the industry and
its products have evolved and advanced. The standard was revised by the FCI Control Valve
Section in 1998 in order to maintain consistency with the appropriate IEC Standards (IEC 534-4).
The standard was revised in 2003 to add the option to permit low pressure gas testing to
determine Class ? the canvass of the 2003 version, one respondent asked for
the standard to be modified to specifically exclude on/off valves used for tight shut-off. The FCI
Control Valve and Regulator Section notes that FCI 70-2 has been intended to apply to control
valve seat leakage. If line isolation and/or absolute tight shut