Ball of trunnion ball valve is fixed, it does not move with medium pressure. Trunnion ball valve has floating seats.  The seats move with the medium pressure to tight the ball and seal ring to ensure sealing reliability. Bearings could be mounted in top shaft and bottom shaft, which reduces   More ..

A floating ball valve is a valve with its ball floating (not fixed by a trunnion) inside the valve body, it drifts toward to the downstream side and tightly pushes against the seat under the medium pressure to ensure sealing reliability. The floating ball valve has simple structure, good sealing   More ..

Normative reference
API 600 Bolted Bonnet Steel Gate Valve for Petroleum and Natural Gas Industries
BS 1414 Specification for Steel Wedge Gate Valves (Flanged and Butt-welding Ends) for the Petroleum, Petrochemical and Allied Industries
ASME  More ..

Normative Reference
API 602 Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries
BS 5352 Specification for Steel Wedge Gate, Globe and Check Valves 50 mm and Smaller for the Petroleum, Pe  More ..

Normative reference
BS 1873 Steel Globe and Globe Stop and Check Valves (Flanged and Butt- Welding Ends) for the Petroleum, Petrochemical and Allied Industries
ASME B16.34 Valves Flanged, Threaded and Welding Ends
ASME B16.5 More ..

Normative Reference
API 602 Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries
BS 5352 Specification for Steel Wedge Gate, Globe and Check Valves 50 mm and Smaller for the Petroleum, Petroch  More ..

 A swing check valve consists of a flap or disc which hangs down in the flow path. With flow in the forwards direction, the pressure of the fluid forces the disc to hinge upwards, allowing flow through the valve. Reverse flow will cause the disc to shut against the seat and stop the fluid go  More ..

A swing check valve consists of a flap or disc which hangs down in the flow path. With flow in the forwards direction, the pressure of the fluid forces the disc to hinge upwards, allowing flow through the valve. Reverse flow will cause the disc to shut against the seat and stop the fluid going ba  More ..

Wafer check valves, also know as dual-plate check valves, has two spring loaded half-moon shaped discs that rotate about their shaft. The disc plates are kept shut by the torsion spring. When fluid flows in the forwards direction, the pressure of the fluid causes the disc plates to hinge open, a  More ..