Droop compensated direct acting pressure regulator

摘要

A self-operated droop compensated regulator includes a spring casing (12) and a lower casing, sandwiching a diaphragm (20). The lower casing has axially aligned inlet (22) and outlet ports (24). A one piece cam stem and relief seat (30) is mounted for movement with the diaphragm and includes a first cam surface (33) for directly engaging a movable disk holder (58). The disk holder is movable in a straight line within an orifice tube (50) that supports the valve seat (52). The cam surface moves the disk holder at a nonlinear rate with respect to the diaphragm. The orifice tube has an extension (56) for providing a boost action to the diaphragm. A pressure relief mechanism (44) is incorporated within the upper portion of the diaphragm. A bias spring (64) acts, between a second similar cam surface (34) on the opposite side of the stem and the disk holder, to maintain the first cam surface in contact with the disk holder.