... upper spring；上弹簧 upper spring seat；上弹簧座 upper stop；上挡块，上止点 ...
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plunger return spring upper seat 柱塞弹簧上座
spring upper seat 弹簧上座
SEAT-SPRING UPPER 上弹簧座
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When the handwheel is rotated toward the open position the upper stem is moved away from the diaphragms allowing the spring to push the lower stem away from the seat.
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。
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