Valve shall have a brass body and stainless steel stem and spring.
这种阀门应该是黄铜阀体，不锈钢阀杆和弹簧。
The relief valve spring will be free inside the body at this point.
这时安全阀弹簧将在阀体自由活动。
Seat Flip: spring back, also can be slow return spring plus damper body.
座板翻转：弹簧回复，也可做弹簧加阻尼慢回复机构。
Seat Flip: spring back, also can be slow return spring plus damper body.
座板翻转：弹簧回复，也可做弹簧加阻尼慢回复机构。
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