| 摘要 |
The invention is for a safety valve for a piping system. The safety valve has a cylindrical housing, a piston assembly with two disc-shaped pistons, each piston having at least one orifice defined therein, a shaft connecting the pistons, a valve stem, and a stop attached to one end of the valve stem. The safety valve has a valve seat with an opening shaped and sized to receive the stop. The safety valve has a spring positioned in the housing against the piston assembly so that the spring exerts a spring force on the second piston in a direction opposite the direction of fluid flow. When fluid forces acting on the piston assembly exceed a spring force acting on the piston assembly, the piston assembly moves in the direction of flow until the stop engages the valve seat and shuts off flow through the safety valve.
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