During compression, the clapper will slowly move up, away from the seat. To examine the seat, continue spring compression until the clapper has moved approximately 1" from the seat. This will allow debris to be removed and or the seat to be examined.
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The lower stem is physically pulled away from the seat instead of being lifted away by the spring.
下阀杆是被从阀座上物理地推开,而不是被弹簧举起来。
The lower stem is encased in a spring which forces the stem away from the seat when the valve is opened.
当手轮象开启位置旋转时,上阀杆离开横膈膜,弹簧推动下阀杆离开阀座。
A receptacle (48) is provided in the housing (29) and is positioned spaced from and faces away from the seat (22).
容座(48)设在外壳(29)中并定位成与座椅(22)间隔开并面朝与座椅相反的方向。
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