A popular type of hinge for a PVC gate is a self-closing hinge. These hinges are typically made of stainless steel and have a spring mechanism that automatically closes the gate after it is opened. Other options may include simple gate hinges with a clamp
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A fully-opening safety valve is a safety valve with a opening height greater than or equal to 1/4 of the flow path. The operating characteristics of this safety valve are two-stage safety valves.