PILOT OPERATED RELIEF VALVE WITH DUAL PILOT REGULATORS.

摘要

A pilot operated pressure relief valve (10) includes a valve body (14) having a fluid inlet (16) and a fluid outlet (18) connected by a fluid passageway (20). A valve plug (22) may be disposed within the fluid passageway (20), the valve plug (22) cooperating with a valve seat (24) to control fluid flow through the fluid passageway (20. An actuator (28) may be connected to the valve plug (22), the regulator (28) biasing the valve plug (22) towards the valve seat (24). A pilot assembly may include a first pilot valve (52) and a second pilot valve (54), wherein the pilot assembly directs fluid pressure upstream of the valve plug (22) to one of the first and second pilot valves (52,54). When the upstream fluid pressure exceeds a predetermined level, the valve plug (22)moves away from the valve seat (24) allowing fluid to flow through the fluid passageway (20).