are made from some kind of resilient material such as Polytetrafluoroethylene (PTFE). Intended for resilient seating valves.
|Port Diameter||Bubbles per minute||ml per minute|
|Leakage Class Designation||Maximum Leakage Allowable||Test Medium||Test Pressure||Testing Procedures Required for Establishing Rating|
|I||x||x||x||No test required|
|II||0.5% of rated capacity||Air or water at 50 - 125o F |
(10 - 52oC)
|45 - 60 psig or maximum operating differential whichever is lower||45 - 60 psig or maximum operating differential whichever is lower|
|III||0.1% of rated capacity||As above||As above||As above|
|IV||0.01% of rated capacity||As above||As above||As above|
|V||0.0005 ml per minute of water per inch of port diameter per psi differential||Water at 50 to125oF (10 to 52oC)||Maximum service pressure drop across valve plug not to exceed ANSI body rating||Maximum service pressure drop across valve plug not to exceed ANSI body rating|
|VI||Not to exceed amounts shown in the table above||Air or nitrogen at 50 to 125o F (10 to 52oC)||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|
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Flow capacities vs. stem opening.
Non-destructive construction testing.
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Applications guide for selecting valves.
Categories of valves.
In case of a specific service - the choose of a valve may be simplified by following an established practice.
Operating temperatures for typical categories of valves - ball valves, butterfly valves and more.
Types of valves and their typical operating sizes.
Designing water process control valves and their Kv values.
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