VALVULA REGULADORA COM COMPENSACAO DE QUEDA

摘要

A self-operated droop compensated regulator includes a spring casing (12) and a lower casing (14), sandwiching a diaphragm (20). The lower casing has axially aligned inlet (22) and outlet ports (24). A one piece cam stem (26) 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. The cam surface moves the disk holder at a non linear rate with respect to the diaphragm. The orifice tube has a removable boost end cap (80) for providing a boost action to the diaphragm. A pressure relief mechanism 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. The boost end cap is snapped in position over the end of the orifice tube and has a plurality of fingers (84) with latch portions that engage an annular groove on the orifice tube. One of the fingers (84a) has a hook end that forms a guide for the rear of the cam stem in a sliding contact. A hole (82) in the end cap reduces the boost effect. Parts that move against each other are of different materials for minimum resistance.