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Pneumatic trunnion ball valve description
Pneumatic trunnion ball valve can ensure sufficient rigidity and strength under maximum rated operation pressure without inherent flaw of cast. Enough wall thickness of separate body and adaptation of high strength tie bolts are convenient for valve maintenance and sufficient to bear the stress of pipe. The internal parts of Pneumatic trunnion ball valve are carefully designed and selected to ensure reliability under all kinds of work condition.
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Pneumatic trunnion ball valve feature
1. Pneumatic trunnion ball valve Anti-fire safe design
When the trunnion ball valve be used normally, its sealed by seat and ball surface, seat retainer sealed by O-ring and body, this is soft sealed and reliable sealing. When the seat and O-ring are burnt, the seat retainer and body will be sealed by expanded graphite. Thus act anti-fire safe purpose.
2. Pneumatic trunnion ball valve Anti-static device
In order to prevent friction among ball, stem and PTFE that generates static electricity which may light the combustibles and explosives that cause an accident, in this ball valve, static-conduction spring is set between the stem and the ball, the stem and the body. Thus static electricity is conducted to ground and system safety is secured.
3. Pneumatic trunnion ball valve Free leakage of body sealed construction
The connective position of valve body and bonnet is double sealed by gasket and O-ring, on this base, such factors as fire, high temperature, shock and uneven opening or closing of the torque all can't induce external leakage.
4. Pneumatic trunnion ball valve Low torque in operation
The self-lubricated bearings are installed at the friction of stem, resulting in wear resistance, flexibility of operation and low torque.
5. Pneumatic trunnion ball valve Emergency sealing
Compound injection holes are designed and compound injection valves are installed at locations of stem/cap and body support of side valve. When sealing of stem or seat is damaged to induce leakage, the compound can be used to do the second time sealing. A concealed check valve is installed in side of each compound injection valve to prevent compound from out flowing due to the action of transmitter substance. The top of the compound injection valve is the connector for fast connection with compound injection gun.
6. Pneumatic trunnion ball valve Extension stem
For the underground installed valve, the stem can be lengthened and for the convenience of operation the corresponding compound injection nozzle and drainage valve can be extended to the top of valve.
7. Pneumatic trunnion ball valve Various driving types
The top pad of valve designed according to ISO 5211, which is convenient for connection and exchange of various drivers. The common driving types are manual, electrical, pneumatic and pneumatic/hydraulic.
8. Pneumatic trunnion ball valve Applicable standards and specifications
Design and manufacturing: ASME B16.34/API 608/ API 6D
Fire safe test: API 607/API 6FA
Anti static: API 608
Face to face: ASME B16.10
End flanges: ASME B16.5
Butt welding ends: ASME B16.25
Inspection and test: API 598/API 6D
9. Pneumatic trunnion ball valve Design descriptions
Full bore or reduced bore design
Bolted bonnet, split body
Three piece body for 12” & above
Trunnion mounted ball type
Blow out proof stem
Fire safe construction
Anti static device
Stopper device
ISO 5211 mounting bracket
Flanged or butt-welding ends
Available with worm geared operator
Materials: A105, A182 F304, F304L, F316, F316L
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Pneumatic trunnion ball valve structure
