单作用，单杆，弹簧复位。
这种阀门应该是黄铜阀体，不锈钢阀杆和弹簧。
Valve shall have a brass body and stainless steel stem and spring.
拆卸安全阀阀盖，阀杆/隔膜总成，和安全阀弹簧。
Remove the relief valve cover, stem/diaphragm assembly, and relief valve spring.
再由最优匹配刚度值设计出相应刚度的扭杆弹簧。
Then the torsion bar spring according to the optimal match is design.
气门杆上的弹簧使气门保持在气门座上(关闭状态)。
A spring on the valve stem tends to hold the valve on its seat (closed).
气门杆上的弹簧使气门保持在气门座上(关闭状态)。
A spring on the valve stem tends to hold the valve on its seat (closed).
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