Graha Valve

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 agains the seat under the medium pressure to ensure a reliable seal.

The floating ball valve is a simple design with goog sealingperformance relying on the seat material to withstand the workload as the sealing pressure is barred by the seat ring. Floating ball valves are mainly used in low to mid level pressure applications.

Cast Steel Floating Ball Valve

Technical Specification

Design and Manufacture : API 608, ISO 17292

Face to Face/ End to End : ASME B16.10

Flange End : ASME B16.5

Test & Inspection : API 598

Main Materials

WCB, LCB, CF8 (M), CF3 (M),

A995 4A, A995 5A, A995 6A,

Alloy 20, Monel, Inconel

Main Parts Material Sheet

Note : (1) The lenght of the bonnet extension of cryogenic valves shall be determined base on actual working temperature

Dimensions and Weights

Class 150

Class 300

Class 600

Floating Ball Valve Torque Table

Note :

The torque measuring and calculation is based on normal room temperature, when selected seat material is PTFE/ RPTFE for Class 150/ Class 300 and Nylon for Class 600.

For low-temperature/ cryogenic service, the torque will increase 2 fold.

When sizing the actuator, a safety factor of 1.3 - 1.5 times shall be applied.

When the service or seat material is different than that specified above, the torque value will be different, it shall be subject to the conformation from the manufacturer.