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Fully-welded ball valve


Model: Qw67F-Fully-welded ball valve
Nominal diameter: 2"~48"
Operating temperature: -196℃~593℃(the range of service temperature may vary for different materials)
Operating pressure: 150-2500 CLASS
Material: A105N;A182 F304,F304L,F316,F316L,A352 LF2,LF2, etc.
Design standard: API 6D,ASME B16.34
Structural length: ASME B16.10
Connecting end: ASME B16.5,ASME B16.25
Test standard: API 598,ISO 5208
Operation method: Handle, worm, motor-drive unit, pneumatic drive unit
Application fields: Oil and natural gas pipelines, and urban gas pipeline
Product features

1.The valve seat is embedded with flexible seal ring for zero leakage of seal; the valve seat is provided with a preloaded spring that is adaptive to the variation of pressure and temperature, so leakage is not liable to happen.

2.Integral valve with welded valve body, free of external leakage, etc.

3.Fire resisting construction of all-welded ball valve. Each leakage position is designed with flexible graphite packing or stainless steel mixing graphite to satisfy the fire resisting requirements in case of a fire.

4.The most advanced support plate structure both at home and abroad is adopted for large diameters to increase the service life and reduce the operating torque of valve. Thus, the service life of valves is greatly extended.

5.The directly-buried all-welded ball valve can be buried directly, in which case, no high and large valve pit is required, only a small shallow pit needs to be built on ground, so the construction cost and the engineering time can be significantly saved.

6.Full bore of valve convenient for pigging, of small flow resistance and high flow capacity and good flow characteristics.

7.The valve ball can completely enclose the valve seat when the all-welded ball valve is opened, so the impurities in the medium will not be flushed to the valve seat or the packing surface of valve body. Hence, the valve body has a same service life as the pipeline due to his special construction.