Ansifci standard 702, from the american national standards institute and the fluid controls institute, defines leakage classifications. The standards and specifications listed above are not comprehensive or discussed in considerable detail, but the importance of understanding the common principals and purpose of the. Ansi fci 702 is the industry standard for control valve leakage. This standard does not apply to pressure regulators as defined in the following standards. Codebookdownload keeps the critical information you need at your fingertips anyplace.
Our policy towards the use of cookies techstreet, a clarivate analytics brand, uses cookies to improve your online experience. Control valve and regulator section notes that fci 702 has been intended to apply to control. Im going to examinate the fluid controls institute standard fci 7022003 about control valve seat leakage formerly known as asme 16. Ansifci 702 american national standard control valve seat leakage flanges, fittings and unions.
Free to establish a series of seat leakage classes for control valves and defines the test procedures. Ansifci 70220 control valve seat leakage fluid controls institute 20 9 pages. It is the kind of leakage rate you can expect from a valve with a metal shutoff disc and metal seat. Ansi fci 9112010, standard for qualifications of control valve stem seals. All constructive suggestions for expansion and revision of this standard are welcome. Ansifci 7022006 standard establishes a series of seat leakage classes for control valves and defines the test procedures. As the valves class number increases, less steam leakage is observed across the valve. Control valve seat leakage fluid controls institute on.
This voluntary standard has been compiled and issued in the public interest. Ansi has defined six permissible steam leak rates for valves. Find the most uptodate version of fci 992 at engineering360. To provide a test methodology for measuring and reporting the capacity of pilot operated and direct acting pressure reducing regulators. Ansifci 7022006 american national standard control valve seat leakage fluid controls institute, inc. They were placed on your computer when you launched this website. Classv which are only performing isolation emergency shutoff and no other controlling function similar to that of a normal control fcl should i test their leakage rates based on fci or as per api.
Pip pcccv002 pressure regulators selection criteria. 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. The procedures of the american national standards institute require that action be taken to reaffirm, revise, or withdraw this standard no. Control valves fci 702, isas75, pressure relief valves api 527, asme ptc 25 iso 5208 en 122661 supersedes bs 6755. Thank you for helping keep engtips forums free from inappropriate posts. Institute standard, ansifci7022006 titled control valve seat leakage.
The standard has been revised several times through the years to stay current as. No contact, friction free opening and closing is excellent for frequent cycling ensures excellent applicability for linear actuation blowout proof stem meets international standards of api 600 and api 6d seat tightness up to ansi fci702 class vi with the use of special lapping on the stellite6 ball and seat sealing area. This standard is similar to ansi 702, control valve seat leakage, but eliminates class v as this is. There are six different seat leakage classifications as defined by ansi fci 702. The big variance between the standards, as shown in. Classifications ansifci 702 defines six classifications of control continue reading. Any valve considered for steam service must have no less than an ansifci class iv rating.
Class i is also known as dust tight and can refer to metal or resilient seated valves. American national standard control valve seat leakage fluid controls institute, inc. V alve testing standards msssp61 ansi fci 702 every valve testing standard has an acceptable leakage rate. Ansi american national standards institute api american petroleum institute. It is strongly recommended that users of fci 702 also obtain a copy of fci 703. Mss manufacturers standardization society sp61 this document is similar to api 598 in that it applies to metal and soft seated valves. There are actually six different seat leakage classifications defined by ansifci 70. Leakage classification of control valves engineering toolbox.
Fci fluid controls institute 702 also called ansifci 702 this document is specifically for control valves, and in general allows higher leakage as a result. Best selling standards american national standards institute. Ansi fci 7022006 american national standard control valve seat leakage1. This part of cgats 21 establishes principles for the use of color characterization data as the definition of the intended relationship between input data and printed color for copy preparation, job assembly, proofing, and graphic arts production printing. Reply to this thread posting in the engtips forums is a memberonly feature.
Theres a major change to the control valve seat leakage standard. The three classes vary in terms of allowable leakage. Ansifci standard 702, from the american national standards institute and the fluid controls institute, defines leakage classifications specifically for control valves. Foreword this foreword is included for information only and is not part of ansiifci 7022006. Suggestions for improvement should be forwarded to the fluid controls institute, inc. The big variance between the standards, as shown in table 1, is the number of cycles tested for each method. Control valve and regulator section notes that fci 702 has been. Ansifci 9112010, standard for qualifications of control valve stem seals. Ansifci 7022006 control valve seat leakage valvias.
The engtips staff will check this out and take appropriate action. Fci fluid controls institute revisions bsrfci 702200x, control valve seat leakage revision of ansifci 7021991 order from. Also defined are specific test procedures to determine the appropriate class. Most backordered items can be rushed in from the publisher in as little as 24 hours. Ansifci standard 702, from the american national standards institute and the fluid controls institute, defines leakage classifications specifically for control valves scope. Misconceptions regarding control and isolation valve standards. Scope ansifci 702 is the industry standard for control valve leakage. It is intended to eliminate present misunderstandings and to assist and guide those people involved in the. This standard establishes six classes of seat leakage for control valves. The procedures of the american national standards institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five. Fci 8722015, power signal standard for springdiaphragm actuated control valves. On the market now is a seat leakage standard for regulatorsfci valve is not fully closed. Fci 8411985 r20, metric definition of the valve flow coefficient c v. Because the valve cv increases approximately as the square of the nominal pipe size, but the length of the leakage path between the plug or sealing member and the seat orifice increases.
Ive already noticed the extension of leakage class v to air instead of water only. Order this important seat leakage set and save on fci 70220 and 7032016. The most commonly used by gemco valve are class i, class iv and class vl. Api is not specific to control valves and there is no mention of. 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. The standard was revised by the fci control valve section in 1998 in. American national standard implies a consensus of those. This standard is similar to ansifci 702 control valve seat leakage. Fci, power signal standard for springdiaphragm actuated control valves. Class vi not to exceed amounts shown in following table based on port diameter.