1.
The lower stem is encased in a spring which forces the stem away from the seat when the valve is opened.
下阀杆包裹在一个弹簧内部，当阀门开启时，弹簧迫使阀杆离开阀座。
2.
When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat.
当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
3.
subsurface controlled subsurface safety valve
井下控制井下安全阀
4.
Locate the Schrader air valve on the shock and remove the air valve cap.
找到避震上的美嘴气阀，取下气阀帽。
5.
The stem rises and lowers as the valve is opened and closed.
当阀门开启或关闭时，阀杆上升或下降。
6.
We'd better check the side valve.
我们最好检查一下旁阀。
7.
surface controlled subsurface safety valve
地面控制井下安全阀
8.
floating in casing
下部装回压阀的套管柱
9.
The sectional drawing illustrates the body cavities surrounding the plug. Circulation is provided from the spaces above and below the plug.
断面图说明环绕阀塞的阀体空穴。从阀塞上方和下方空间提供环流。
10.
The relief valve should be able to be removed by unscrewing the relief valve from the housing.
通过从外壳上旋下安全阀应该能够拆卸安全阀。
11.
Wellhead surface safety valves and underwater safety valves for offshore service
海上用井口上部安全阀和水下安全阀规范
12.
There can be no shutoff valves downstream of an AVB.
在大气真空断路阀的下游不能有关断阀。
13.
Remove the relief valve hose from fitting below inlet ball valve.
从进口球阀下面连接件拆卸安全阀软管。
14.
The top of retainer must drop just below threads in the valve body.
护圈上方必须放置在阀门阀体螺纹以下。
15.
Lift off the first check valve cover. The check valve inside will come out with the cover and is attached with a bayonet type locking arrangement.
卸下第一止回阀阀盖。内部的止回阀将随着阀盖拔出来，附带着卡口锁定装置。
16.
Press discharge valve until the pressure meter indicates zero.
按下排气阀，直到压力表指示为零即可。
17.
Do not remove collar bushing with valve under pressure.
在阀门处于压力状态下,不要拆卸轴环。
18.
Copper tubing shall not be used on the downstream side of the backflow preventer.
在防回流阀的下游不应该安装铜管。