防操作的可靠性

　　大口径固定式球阀的相对连动部(阀座和阀杆轴承)由于采用了摩擦系数小的特氟龙,因而操作扭距小，此外，由于密封润滑脂的长期产润滑，使得操作更加灵活。

　　Operational Reliability

　　For large ball valve, the TFE is adopted for seat and stem bearing,the relative movement at bearing portion requires less operationaltorque force because of less friction of the TFE, in addition, the longtime lubrication of the sealants makes the operation more effective.

　　阀座结构

　　阀座的结构有两种:单密封和双密封结构，一般具有自动泄压机能是单密封，双密封则由阀体上附加的安全泄压。

　　Seat Disign

　　There are tow kinds of seat design, single seal and double seal, theformer normally has self relief function, the latter relieves the pressurethrough the safety valve on the body.

　　阀杆加长

　　阀杆加长适用于埋地及低温用，加长尺寸根据需要确定，操作方式有手动、电动、气动、气液连动等。

　　Extended Stem

　　The extended stem is designed for underground and low temperatureservice, the length of stem depents on the service requirement. Theoperation methods include manual pneumatic-hydraulic etc.

　　对外力的安全性

　　阀体的壁厚根据高压容器的安全法规进行设计，对承受外力抗弯曲等符合API 6D规定，强度足够。

　　Safety on External Force

　　The body thinkness is designed in conformance to the requirementsof high-pressure vessel code and has enough strength As requiedby API 6D to prevent bucking induced external.

　　阀杆压盖部密封

　　填料压盖部密封如图所示采用了四个O型圈和密封注脂装置。