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Trunnion Mounted Ball Valve Balls / Spheres

Trunnion mounted ball Valve Balls have additional mechanical anchoring at the top and bottom. The Trunnion style balls prevent ball from blowout and contributes to low operating torque. It is suitable for large and high pressure ball valves. This design of trunnion mounted valve ball provides automatic relief of cavity overpressure. These balls are available with soft seals as well as metal seats designed for either high temperature or cryogenic service.



The trunnion mounted ball valve balls have another stem at the bottom to fixed the position of the ball, so the ball can’t move. When the trunnion ball valve is closed, the ball does not produce displacement.
The trunnion ball valve is a kind of double-block-and-bleed(DDB) valve, while the floating ball valve only seal the downstream side.The trunnion ball valve can block both upstream and downstream media. And when the pressure in the middle cavity is greater than the seat spring force, the seat will be pushed open to release the pressure inside the chamber to ensure safety.The trunnion ball valve can be used in high pressure conditions and the size can be up to 60 inches.



Carbon steel, stainless steel, cryogenic steel and special alloy. 

ASTM A 105, A350 LF2, A182 F304, A182 F316, A182 F6A,

Duplex A182 F51, A182 F53, A564 630 (17-4PH),

Inconel 625, 690, 600, 617, 718, 718 SPF,

Monel 1400, R-405, K-500,

Titanium Gr3, Gr4, Gr7,

Incoloy 800, 825, 903, 907,

Hastelloy C serial, B etc

Dimension1/2″~60″  DN15-DN1500 
Processing Forging, centrifugal casting , coil welding
Surface roughnessRa 0.4-0.2 
Roundness ≤0.03mm
PackagePlywood Cases or Carton 
Types of ballFloating ball , trunnion ball ,hollow ball, solid ball, Metal to Metal ball, T-port ball,V-port ball,Special ball,Blank segment balls etc 
Surface treatment

Thermal Spray and Cold Spray:

Nitridation, ENP nickel plating, Chrome Plating,

HVOF Tungsten Carbide, HVOF Chrome Carbide,

NI60, NI55

Stellite 6# 12# 20#, Inconel, etc