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Industrial Valves
Trunnion Mounted Ball Valve

Trunnion Mounted Ball Valves

The ball is mounted on trunnions supported in body bearings above and below the ball. Sealing is achieved by spring loaded piston type seats which shut off flow when the line pressure acts on the upstream seat. This design provides automatic relief of cavity overpressure. The standard design cannot be used for double block and bleed isolation duty but "twin seal" designs are available which can, although they would seldom be first choice for such a service.

In this case, automatic cavity relief is forfeited and an external relief valve must be provided if this ia a requirement.

Valve Specs

Valve DesignSide entry, Top entry
ConstructionBolted body
Trim DesignTrunnion ball
Size2" - 36"
Pressure Range150# - 2500#
DesignASME VIII or B 16.34
BoreFull or Reduced
MaterialsCarbon Steel, Stainless Steel, Duplex, Super Duplex
Incoloy, Bronze
Titanium
Exotic Material
Conform To NACE MR 01-75
Material StatusForged or Cast
SeatsSoft or Metal
SealsO-Rings or Lip-Seals
TestingAPI 598 - API 6D
OperatorWrench, Gear, Actuated

Trunnion Mounted Ball Valve Gallery

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