Importance

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Abstract

A safety system for automatically preventing over pressure in the interior of a pneumatically operated tool supplied from a source of compressed air includes a safety relief valve detachably connected between the tool and the compressed air source. The safety valve includes a hollow housing having a relief port therein and a resettable valve member is mounted in the housing and movable to open and close the relief port in response to the level of air pressure supplied from the source of compressed air. The housing includes an access opening opposite the relief port and a removable stop member is provided to normally close the access opening and limit the movement of the valve member in a direction inwardly of the housing. The access opening is dimensioned to permit easy insertion and removal of the valve member into and out of the housing. A biasing spring is mounted on the valve member for maintaining an inner end of the member in engagement with the stop until an over pressure is encountered and when this occurs, the excessive air pressure becomes effective to move the valve member outwardly to open the relief port. Once the over pressure no longer obtains, the biasing spring is again effective to reseat the valve and close the relief port so that tool operation may be continued.

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First Claim