| 摘要 |
Pressure relief valve with an inlet (IN), and outlet (OUT) and a moveable piston (PI1), pressed by an element against its seat to close a passage between inlet (IN) and outlet (OUT) at normal working pressure in the fluid system, which will open the passage at a predetermined overpressure. For testing its function, it has got a second piston (PI2) fixed to the first piston (PI1) and a pilot valve (A) for putting a test pressure on the second piston (PI2) in a test pressure chamber.
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