FCI 70.2 PDF

It is the kind of leakage rate you can expect from a valve with a metal shut-off disc and metal seat. Soft Seat Valves are those where the seat or shut-off disc or both are made from some kind of resilient material such as Teflon. The tube end shall be cut square and smooth with no chamfers or burrs. The tube axis shall be perpendicular to the surface of the water. Other measuring devices may be constructed and the number of bubbles per minute may differ from those shown as long as they correctly indicate the flow in milliliters per minute.

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It is the kind of leakage rate you can expect from a valve with a metal shut-off disc and metal seat. Soft Seat Valves are those where the seat or shut-off disc or both are made from some kind of resilient material such as Teflon. The tube end shall be cut square and smooth with no chamfers or burrs. The tube axis shall be perpendicular to the surface of the water.

Other measuring devices may be constructed and the number of bubbles per minute may differ from those shown as long as they correctly indicate the flow in milliliters per minute. Read our Q3 Outlook Survey. About 9 hours ago from Gemco Valve's Twitter. About 2 days ago from Gemco Valve's Twitter. About 4 days ago from Gemco Valve's Twitter. Worthy read. Sustainability pays off. Manufacturers across the world are looking for ways to go green.

Energy efficient practices in mfg can yield significant rewards, both for the environment and your business. Control Valve Seat Leakage Classifications. Class III 0. Class IV 0. Class V 0. Pressure applied to valve inlet after filling entire body cavity and connected piping with water and stroking valve plug closed. Use net specified max actuator thrust, but no more, even if available during test.

Allow time for leakage flow to stabilize. Class VI Not to exceed amounts shown in following table based on port diameter. Air or nitrogen at F C 50 psig or max rated differential pressure across valve plug whichever is lower. Actuator should be adjusted to operating conditions specified with full normal closing thrust applied to valve plug seat.

Allow time for leakage flow to stabilize and use suitable measuring device. Latest Tweets. Follow gemcovalve. Valve FAQs Learn how to choose the best valve for your application. Pressure applied to valve inlet with outlet open to atmosphere or connected to a low head loss measuring device full normal closing thrust provided by actuator.

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DRM is included at the request of the publisher, as it helps them protect their copyright by restricting file sharing. Visit FileOpen to see the full list. January Control Valve Seat Leakage. April Control Valve Seat Leakage.

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Leak testing of Valves

The API standard Valve Inspection and Testing, covers the testing and inspection requirements for gate, globe, check, ball, plug and butterfly valves. It has acceptable leakage rates for liquid as well as gas testing. All valves built to the various API standards are required to meet API leakage criteria prior to shipment from the manufacturer or supplier. If the fluid is a liquid, there shall be no visible evidence of drops or wetting of the external surfaces no visible leakage through the body, body liner, if any, and body-to-bonnet joint and no structural damage.

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