Ansifci standard 702, from the american national standards institute and the fluid controls institute, defines leakage classifications specifically for control valves. On the market now is a seat leakage standard for regulatorsfci 7032003. Scope ansifci 702 is the industry standard for control valve leakage. There are six different seat leakage classifications as defined by ansi fci 702. Fci 7032004 download ansi, icc, ul, asme standards. Suggestions for improvement should be forwarded to the fluid controls institute, inc. They were placed on your computer when you launched this website. It is the kind of leakage rate you can expect from a valve with a metal plug and. This standard establishes six classes of seat leakage for control valves. Ansifci 7032004 regulator seat leakagefci 8712004 classification and operating principles of steam trapsfci 9111997 r2003 standard for. Ansifci 7022006 standard establishes a series of seat leakage classes for control valves and defines the test procedures.
V alve testing standards msssp61 ansi fci 702 every valve testing standard has an acceptable leakage rate. This standard does not apply to pressure regulators as defined in the following standards. Fci, power signal standard for springdiaphragm actuated control valves. Class i is also know as dust tight and can refer to metal or resilient seated valves. Instantly download the fci 70 2 20 control valve seat leakage. In addition the guiding, the seat material, the actuator thrust, the pressure drop and the type of fluid all play part in how well particular control valves shuts off. Country or governing nobo which regulates the end user standard. It is strongly recommended that users of fci 702 also obtain a copy of fci 703. Ansi fci 70 2 2006 american national standard control valve seat leakage1. Also defined are specific test procedures to determine the appropriate class. The fci has periodically updated the standard since the standards development in 2001. The most common used are class iv class vl class iv is also known as metal to metal.
It really depends on the end user agreed standard or recommended practice or how the sil analysis view it. This standard does not apply to pressure regulators as defined in. The standard cannot be used as a basis for predicting leakage at conditions other than those specified. Classification of seat leakage through control seat leakage. The standard has been revised several times through the years to stay current as the industry and its products have evolved and advanced. Our policy towards the use of cookies techstreet, a clarivate analytics brand, uses cookies to improve your online experience. The most commonly used by gemco valve are class i, class iv and class vl. Ansifci 7022006 control valve seat leakage pdf document.
Fci standards control valve section fluid controls institute. Ansifci standard 702, from the american national standards institute and the fluid controls institute, defines leakage classifications specifically for control valves scope. Im going to examinate the fluid controls institute standard fci 7022003 about control valve seat leakage formerly known as asme 16. It is the kind of leakage rate you can expect from a valve. Control valve seat leakage fluid controls institute on. Leakage classification of control valves engineering toolbox. The standard applies to pilot operated and direct acting pressure reducing, pressure relieving back pressure, differential pressure and temperature regulators. Ansifci 7022006 control valve seat leakage valvias. During the canvass of the 2003 version, one respondent asked for the standard to be modified to specifically exclude onoff valves used for tight shutoff.
Responding to the industrys request, the fci has recently updated the standard to include class viii, which is a no permissible leakage or bubble tight standard generally associated with resilient. Join your peers on the internets largest technical engineering professional community. Ansi american national standards institute api american petroleum institute. There are six different seat leakage classifications as defined by ansi fci 70 2.
Ansi fci 70 2 is the industry standard for control valve leakage. Ansi fci 70 2 2006 class vi maximum seat leakage allowable ansi fci 70 2 2006 bubbles per minute as tabulated are a suggested alternati. Control valve seat leackage class vi maximun seat leackage. This voluntary standard has been compiled and issued in the.
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