Trunnion Mounted Ball Valves

Detailed Product Description

Trunnion Mounted Ball Valves Design Feature

Sealing construction of valve seat
Trunnion mounted ball valve has all kinds of sealing construction. Our company produce Trunnion mounted ball valve as API6D designed, according to different working condition with different sealing construction.


Self-Relieving construction
When an abnormal rising of pressure appear in the internal body cavity, the single sealed-structure takes on the function of automatic pressure relieving, while the double-sealed structure can finish the job through a attached pressure-reliving device to the valve body.

Anti-Static Device
Anti-static device is a standard feature of kihsco ball valve. A spring-loaded pin assures the electrical continuity, between ball, stem and body, so as to avoid sparks during turning of the stem to open and close the valve, which could be dangerous in case of hazardous area installation.
Anti Blow-out Stem
The stem is made separately from the ball; The lower end of the stem is designed with an integral collar to be blow-out proof.

Fire Safe Design
External Leakage Prevention
Leakage from the valve stem area is prevented by double sealing with 2 O-rings and top cover gasket. Leakage through the valve body joint is also blocked by double sealing with O-ring and body gasket. After a fire has deteriorated O-rings, top cover gasket, body gasket and stem fire safe packing are the measure that prevents external fluid leakage.

Internal Leakage Prevention
When non-metal materials such as O-ring and seat insert are decomposed or deteriorated
by fire, the edge of the metal seat preloaded by the seat spring comes into contact with ball to
shut off the line fluid to minimize internal leakage through the valve bore.

Emergency Sealant Injection System
For 6 inch and larger kihsco Trunnion mounted ball valves will be installed with a sealant injection fittings on both stem and seats. When the sealing materials (seat sealing or stem o-ring) are damaged or decomposed by fire or other accidental causes, leakage from the seat and stem can be prevented by injection of sealant into these fittings. Fitting also internally installed a second check valve to provides backup sealing.

Product Specification/Models
Technical Data
SizeNPS2~60 DN50~1500
Pressure RatingsClass150~1500PN16~100
Body Materials ASTM: WCB(A105) CF8304CF3304LCF8M316CF3M316L
D I NGS-C25(St50-2)1.4308/1.43011.43061.4408(1.4401)1.4404
Design StandardDIN3356API 6DASME B16.34
Face to FaceDIN EN 558ASME B16.10
Flanged EndsDIN EN 1092ASME B16.5
Test and InspectionISO5208, DIN3230API 6DAPI598
Fire-safe Design ISO 10497API 607 API 6FA
Notes: The sizes of serial valve flange dimension can be designed according to customers requirement.