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- Valve_leakage abstract "Valve leakage refers to flow through a valve which is set in the 'off' state.The importance of valve leakage depends on what the valve is controlling. For example, a dripping tap is less significant than a leak from a six-inch pipe carrying high-pressure radioactive steam.In the United States, the American National Standards Institute specifies six different leakage classes, with "leakage" defined in terms of the full open valve capacity: Class I, or 'dust-tight' valves, are intended to work but have not been tested Class II valves have no more than 0.5% leakage with 50psi (or less if operating pressure is less) of air pressure at the operating temperature Class III valves have no more than 0.1% leakage under those conditions; this may require soft valve seats, or lapped metal surfaces Class IV valves have no more than 0.01% leakage under those conditions; this tends to require multiple graphite piston rings or a single Teflon piston ring, and lapped metal seats. Class V valves leak less than 5*10^-12 cubic metres, per second, per bar of pressure differential, per millimetre of port diameter, of water when tested at the service pressure.Class VI valves are slightly different in that they , and are required (at 50psi or operating pressure, whichever is less) to have less than a specified leakage rate in millilitres of air per minute:".
- Valve_leakage wikiPageExternalLink Class_VI.pdf.
- Valve_leakage wikiPageID "24801788".
- Valve_leakage wikiPageRevisionID "594892909".
- Valve_leakage hasPhotoCollection Valve_leakage.
- Valve_leakage subject Category:Valves.
- Valve_leakage type BodyPart105220461.
- Valve_leakage type Part109385911.
- Valve_leakage type PhysicalEntity100001930.
- Valve_leakage type Structure105225602.
- Valve_leakage type Thing100002452.
- Valve_leakage type Valve105395286.
- Valve_leakage type Valves.
- Valve_leakage comment "Valve leakage refers to flow through a valve which is set in the 'off' state.The importance of valve leakage depends on what the valve is controlling.".
- Valve_leakage label "Valve leakage".
- Valve_leakage sameAs m.080bq9k.
- Valve_leakage sameAs Q7912829.
- Valve_leakage sameAs Q7912829.
- Valve_leakage sameAs Valve_leakage.
- Valve_leakage wasDerivedFrom Valve_leakage?oldid=594892909.
- Valve_leakage isPrimaryTopicOf Valve_leakage.