Ball Valve Metal Seat Leakage Class

Class vi is often misinterpreted as bubble tight. B leakage rates b possibly will apply for metal seated valves on more critical services. It is the kind of leakage rate you can expect from a valve with a metal shut off disc and metal seat.

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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.

Ball valve metal seat leakage class. Class vl is known as a soft seat classification. Class iv is also known as metal to metal. Class i is also know as dust tight and can refer to metal or resilient seated valves. A leakage rate a is intended to apply for soft seat e g elastomeric or polymeric valve closure elements.

It is the kind of leakage rate you can expect from a valve with a metal shut off disc and metal seat. This shutoff classification is necessary for those applications where a throttling or control valve is used as a blocking valve that is required to stay closed for lengthy periods against a high pressure drop. Class vl is known as a soft seat classification. Class ii valve leakage classifications.

Ansi fci 70 2 class vl hard graphite seated ball valves trim 3h maximum allowable seat leakage. The leakage limit depends on valve size and range from 0 15 to 11 5 ml per minute for valve sizes 1 through to 12 inches known as soft seat classification. Psig test pressure asme 150 asme 300 ss. 0 5 leakage of full open valve capacity.

Class vi is also frequently used as a leakage bench mark for metal seated control and isolation valves where a tight degree of shut off is required. Class v is unique in that it is the only shutoff classification where the allowable seat leakage is allowed to vary according to the orifice diameter and the differential pressure pressure drop. This class establishes the maximum permissible leakage generally associated with commercial unbalanced single seat control valves and balanced single seat control valves with extra tight piston rings or other sealing means and metal to metal seats. Ansi fci 70 2 class vi pressure temperature rating unit.

The installation of metal seated valves can comply with shut off standards which include ansi fci 70 2 1976 and designed for allowed leakage. 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. Class iv is also known as metal to metal. It is the kind of leakage rate you can expect from a valve with a metal shut off disc and metal seat.

Intended for double port or balanced singe port valves with a metal piston ring seal and metal to metal seats. Service dp or 50 psid 3 4 bar differential whichever is lower at 50 to 125 of. C leakage rates d possibly will apply for metal seated check valves. Class iv is also known as metal to metal.

Class shell test seat test metal seated ball valves trim 5h 6h maximum allowable seat leakage. Class vl is known as a soft seat classification. The most frequently specified leakage classes include class v and vi.