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| Number | Title | Issue Date |
| 8215330 | Adjustable recirculating valve An adjustable automatic recirculation valve includes a valve body, a main valve disk, a bypass valve and a dynamic adjustment assembly. The main valve disk is positioned within the valve body and opens in response to fluid flow between a main inlet and a main outlet... | 07/10/2012 |
| 6192924 | Pilot operated relief valve A pilot operated safety relief valve (14) in which a pilot valve (32) controls the opening and closing of the main valve member (26). The pilot valve (32) has a spindle valve member (70) between an intermediate dome fluid chamber (52) and an exhaust chamb... | 02/27/2001 |
| 6161570 | Pilot-operated relief valve A pilot operator and a relief valve are provided in the same housing. The pilot-operating mechanism is contained partially within the main closure element of the valve and partially within the valve cap. Inlet pressure to the valve is communicated to the ... | 12/19/2000 |
| 5769113 | Dual pilot manifold assembly for a safety relief valve A manifold assembly 10 for operating a safety relief valve 12 includes a manifold block 60 having a block inlet port 230, a block dome pressure port 232, and a pair of control cavities 220 and 222 each adapted for receiving a pilot valve 70 or auxiliary c... | 06/23/1998 |
| 5590684 | Dual pilot manifold assembly for a safety relief valve A manifold assembly 10 for operating a safety relief valve 12 includes a manifold block 60 having a block inlet port 230, a block dome pressure port 232, and a pair of control cavities 220 and 222 each adapted for receiving a pilot valve 70 or auxiliary c... | 01/07/1997 |
| 5333635 | Fluid pressure relief system for pressure vessels A fluid pressure relief system and method for a pressure vessel or tank (10) having a normal vent (16) with a first pilot operated safety valve (18) and an emergency vent (62) having a second pilot operated safety valve (25). A vapor recovery line (20) is... | 08/02/1994 |
| 5307831 | Safety relief valve for pressure vessels A fluid pressure safety relief system for a pressure vessel (10) having a main valve member (46) seating on a nozzle ring (38) under a mechanical force of a predetermined amount resulting from a calibrated counterweight (54). An operating rod (55) is conn... | 05/03/1994 |
| 5282491 | Fluid pressure relief system for pressure vessels A fluid pressure relief system and method for a pressure vessel or tank (10) having a normal vent (16) with a first pilot operated safety valve (18) and an emergency vent (62) having a second pilot operated safety valve (25). A vapor recovery line (20) is... | 02/01/1994 |
| 5246034 | Fluid pressure relief system for pressure vessels A fluid pressure relief system and method for a pressure vessel or tank (10) having a normal vent (16) with a first pilot operated safety valve (18) and an emergency vent (62) having a second pilot operated safety valve (25). A vapor recovery line (20) is... | 09/21/1993 |
| 5027852 | Pilot valve for control valves and method of operation A pilot valve (40) for a control valve (14) has a separate auxiliary source of high pressure fluid (106) for the operation of the pilot valve (40). The dome chamber (36) of the control valve (14), the inlet fluid chamber (72), and the intermediate fluid c... | 07/02/1991 |
| 4705065 | Safety relief system for control or vent valves A safety relief system for a valve in a vent or a main flowline. The safety relief system utilizes a main actuator (24) utilized primarily for a positive pressure condition and a vacuum actuator (96) in axial alignment with the main actuator (24) utilized... | 11/10/1987 |
| 4682495 | Testing device for pilot valves A testing device (22) for a non-flowing pilot valve (20) controlling a main relief valve (13) and simulating the action of the relief valve (13). The testing device body (84) has a test fluid source (42) releasably connected thereto and includes a piston ... | 07/28/1987 |
| 4632143 | Pressure boost attachment for pilot valves A fluid pressure boost attachment (18) is attached to a pilot valve (16) which senses the fluid pressure in a main flow line F. Upon restriction or blockage of fluid flow through inlet line (32) to pilot valve (16) the correct static fluid pressure is sen... | 12/30/1986 |
| 4609008 | Non-flowing pressure responsive pilot valve A non-flowing pilot valve (16) for a control valve (C) in a main flow line (F) having a body (27) with an inlet fluid chamber (76), an outlet fluid chamber (106) and an intermediate fluid chamber (104) between the inlet fluid chamber (76) and the outlet f... | 09/02/1986 |
| 4586534 | Check valve mechanism A check valve mechanism providing a valve body and valve seat assembly having noncircular eccentrically located hinge pin receptacles with independently controlled X-axis and Y-axis hinge pin locating surfaces. A simple cylindrical hinge pin is supported ... | 05/06/1986 |
