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| Number | Title | Issue Date |
| 4324506 | Self-regulating fluid control valves A self-regulating tide gate is installed on a conduit connecting an open body of water with a protected body of water. The tide gate comprises a mounting plate secured to the conduit at its end in the open body of water, the mounting plate defining an ope... | 04/13/1982 |
| 4296649 | Hydraulically operated transmission control A hydraulically operated control arrangement for a transmission includes a spring-loaded pressure regulating valve which slides into a position to cut off an exit chamber for hydraulic fluid from an input chamber for pressurized hydraulic fluid so as to r... | 10/27/1981 |
| 4295489 | Pilot-operated back pressure regulator A pilot-operated back pressure regulator of simplified design and construction having a balanced valve plug attached to a diaphragm actuator and secured to the regulator body by bolts for ready simultaneous removal of the plug and actuator. The diaphragm ... | 10/20/1981 |
| 4258747 | Flow system with pressure level interlock control apparatus A vacuum operated sewage system includes a static pressure sensor establishing a trigger signal at a selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a trigger and timer controller at the sele... | 03/31/1981 |
| 4252146 | Bypass valve assembly and system A valve assembly comprises a valve body having a hollow and a valve element longitudinally movable between first and second positions therein. The valve assembly has at least one inlet and at least one outlet in pressure communicating relation to the holl... | 02/24/1981 |
| 4250913 | Pilot mechanism for pressure regulating valve A pilot mechanism for a pressure regulating valve having a relatively high pressure inlet, a relatively low pressure outlet and main valve pressure responsive means for operating the main valve to control the pressure of the fluid downstream of the main v... | 02/17/1981 |
| 4249556 | Isolating and backflow preventing valve assembly A liquid supply system in which liquid is only supposed to flow from a high-pressure upstream portion to a low-pressure downstream portion is provided with a backflow preventer and upstream thereof with an isolating valve assembly. The backflow preventer ... | 02/10/1981 |
| 4245663 | Valve with condensate recovery device A pressure relief valve of the diaphragm type having a condensate recovery device. The condensate recovery device is connected to the disc of the relief valve and provides means for moving condensate from an upper control chamber to either an inlet chambe... | 01/20/1981 |
| 4240463 | Safety valve actuator and pilot system A safety valve actuator and pilot system for emergency closure of a flow line for fluids such as oil and gas including a hydraulic valve actuator connected on a valve in a flow line for opening and closing the valve, a pressure sensing pilot valve communi... | 12/23/1980 |
| 4230187 | Methods and apparatus for sensing wellhead pressure This invention relates to methods and apparatus for monitoring fluid pressure in a subsea petroleum installation or other similarly inaccessible system while isolating the well fluid from the production control system. In one particular form of the invent... | 10/28/1980 |
| 4188968 | Flow system with pressure level responsive air admission control A vacuum operated sewerage system includes a static pressure sensor establishing a trigger signal at selected first level in a standpipe. The sensor is connected upstream of a discharge control valve and actuates a timer at the selected sensed pressure. T... | 02/19/1980 |
| 4187870 | Valve actuator and pilot assembly therefor A valve actuator and a pilot assembly which may be utilized either alone or with the actuator is responsive to control fluid pressure for moving an operative means of a valve between open and closed positions. The actuator has a housing defining a cylindr... | 02/12/1980 |
| 4176677 | Relay pilot regulator A relay pilot regulator for use in combination with a main regulator in a gas distribution system, the gas distribution system including an inlet conduit supplying gas at an inlet pressure and an outlet conduit for delivering gas at a reduced outlet press... | 12/04/1979 |
| 4172466 | Self-actuated pilot-controlled safety valve There is disclosed a self-actuated pilot-controlled pressure-responsive valve for fluid pressure systems wherein the main valve is arranged to be seated by the fluid pressure in the system and a normally balanced piston and cylinder assembly pulls the mai... | 10/30/1979 |
| 4157167 | Valve actuator and pilot assembly therefor A valve actuator and a pilot assembly responsive to control fluid pressure for moving an operative means of a valve. The actuator has a housing defining a cylindrical bore therethrough and a shaft is carried in the housing which is engagable with the oper... | 06/05/1979 |
| 4129141 | Scram valve The scram valve has a closing piston which can be controlled by a pilot valve in a pressure medium supply line to the closing piston. The pilot valve has a control piston which is spring biased on one side and connected on the other side with the flow of ... | 12/12/1978 |
| 4100932 | Pipe burst safety device for natural gas pipe lines or the like A pipe line has a check valve therein, operable by an actuator. The actuator is connected to be operated by fluid pressure from the pipe line, and is connected with the pipe line by a control circuit including valve means. A differential pressure valve is... | 07/18/1978 |
| 4074692 | Pipeline break shutoff control A pipeline shutoff control actuated by movement of a pressure responsive element connected to the pipeline and having a predetermined restraining force applied thereto, said restraining force adapted to release said element in response to a predetermined ... | 02/21/1978 |
| 3991784 | High/low safety valve A high-low shutoff valve of the reciprocating ball type which does not vent fluid to atmosphere upon the closing of the valve in response to operation of either the high or low pressure pilot.... | 11/16/1976 |
| 3982558 | Fluid pressure control valve A fluid pressure operated control apparatus comprising a casing having an inlet and outlet for the flow of fluid under pressure, a diaphragm mounted in the casing having opposite sides thereof responsive respectively to outlet fluid pressure and a regulat... | 09/28/1976 |
| 3982559 | High temperature fluid pressure control valve A fluid pressure operated control apparatus comprising a casing having an inlet and outlet for the flow of fluid under pressure, a diaphragm mounted in the casing having opposite sides thereof responsive respectively to outlet fluid pressure and a regulat... | 09/28/1976 |
| 3977423 | Valve control apparatus and method An apparatus and method for controlling a fluid pressure actuated valve are provided whereby the valve inlet pressure and valve outlet pressure are applied to control and limit the valve outlet pressure and to substantially reduce the fluid pressure appli... | 08/31/1976 |
| 3951568 | Pump check valve control apparatus A pump check valve control apparatus includes a pump for delivering a fluid to a system. A valve between the pump and the system controls the delivery of the fluid to the system. A valve actuator, signalled by an actuator control, begins to open the valve... | 04/20/1976 |
| 3945395 | Vent and relief valve A vent and relief valve for a tank containing pressurized fluid such as oxygen or hydrogen characterized in that coaxial vent and relief valve members have interengaged seats to close the vent outlet of the valve, the vent valve member having actuating me... | 03/23/1976 |
| 3938547 | Pressure regulator A large vacuum pump is connected through a vacuum line to the cow milking apparatus, and a vacuum regulator is employed to admit into the line the amount of ambient air necessary to maintain the line pressure (and thus the pressure at the milking apparatu... | 02/17/1976 |
