压力等级 Pressure class
PN 10/16/20/25/40/50 Class 150/300
对夹式 Wafer type： DN25-250 /1~10B
法兰式 Flange type： DN25-400 / 1 ~16-
管线球阀使用聚合材料作为阀座密封，密封座用弹簧加载， 在较广的温度变化和压力变化范围内具有优良的密封性能， 确保在关闭压差作用下达到无气泡泄漏的密封，且在最大 压差下仍可保持最小操作扭矩。
The pipeline ball valves have excellent seal function under wide temperature variety and pressure variety because pipe ball valves use polymers compounding as seat seal which uses spring loaded, therefore no air bulb leakage will be retained under closing differential pressure and Min. operation torque will be attained under Max. differential pressure.
Forged steel structure
The valve body and connector of ball valve are made of forged steel while its inner parts are exquisitely selected, so as to ensure the product to operate reliably under various work conditions, The wall thickness of the body and the connection strength of valve bolts is performed as per ASME B15.34. the relating pressure class and reliable strength of joint is insured through strict calculation.
Low operating torque
Fixed ball and floating seat is applied in ball valve, by which ow torque can be attained under operating pressure. Self-lubricating PTFE metal axle sleeve is used with high-strength and high-polished stem to enable friction coefficient smallest.
The polymeric sealing seat suitable for various pressure classes is floating and loaded by spring, keep close contact with the body at Off position, thus reliable sealing is reached Before delivery, each valve is wholly examined as per API 6D, API598 or GB/T 13927 and test qualified in the written test report.
Auxiliary valve seat sealing
Shown in the following diagram, the ball valve its diameter is greater than and equal to 6 inches (DN150)is provided with auxiliary valve seat sealing system. When soft sealing is damaged for a certain degree and minor leakage is occurred, the auxiliary is obtained by the sealant injected by auxiliary sealing system. The system also can wash and lubricate the seat as necessary in order to retain the Cleanness.
Note: (As shown in Diagram 1)a cleaning valve is set at ball valve body its diameter is less than and equal to 4 inches(DN 100), this cleaning valve is available for injecting cleaner and has no sealing function.
Reliable sealing to stem and body
The stem and body sealing materials respectively employ fluorubber O-ring and graphite gasket meeting the requirements of international advanced standards to ensure reliable sealing under various work conditions.Fluorubber O-ring preventing from pressure reduction explosion can also be applied for sealing materials in order to ensure the sealing of stem and body under
severe fluctuation. Besides, mos: of stems are installed with auxiliary sealing device.