| 摘要 |
A safety valve for pressure fluid flow lines and which may be utilized in combination with a punch tee, said valve being responsive to pressure differentials acting thereacross for automatically closing to preclude accidental loss of pressure fluid from the line. The valve comprises body means adjustably secured in communication with the pressure fluid of the flow line, valve seat means provided on the body means, cage means carried by the body means, ball means loosely disposed in the cage means to provide a normally open position for the valve and responsive to pressure differentials thereacross for automatically engaging the valve seat to provide a closed position for the valve, locking means adjustably disposed in the proximity of the body means for providing a predetermined positioning or setting for the body means for calibrating the pressure responsive sensitivity for the ball means, and means for selectively opening the valve against said closing pressure differential.
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