Pressure-relief valve devices

摘要

A pressure-relief valve device has the stem of a valve member guided within a sealed bore of a guide piece screwed into or onto a sleeve-like housing. A spring in the housing acts on a pressure disk to create closure force on the head of the valve member. A connector, which may provide a plug-in connection to some equipment to be controlled, is in screw-threaded engagement with the guide and can be removed to provide ready access to the valve member without disturbing the remainder of the assembly and its setting. The valve member has a piston opposite the head which fits in a recess in the connector. An end wall of the recess forms a stop limiting the closed position of the valve and an end face of the guide forms a complementing stop face limiting the open position of the valve.