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Match Document Document Title
7766030 High pressure transducer  
A high pressure transducer is disclosed. The transducer includes a supply inlet configured to provide a gas supply to the high pressure transducer at a supply pressure and a pressure divider...
7337041 Feedback control methods and apparatus for electro-pneumatic control systems  
Methods and apparatus related to feedback control for electro-pneumatic control systems are disclosed. An example electro-pneumatic control system comprises an electro-pneumatic controller and a...
7234483 Electro-pneumatic air pressure regulator  
An electro-pneumatic air pressure regulator includes a primary pressure introduction port, a secondary pressure output port, a pilot pressure chamber, a main valve for opening and closing a...
6527862 Flow controller  
A control system for digitally monitoring and/or controlling pressure to a pneumatic load such as a stop/suckback valve. Pressure is sensed in the pneumatic fluid input lines to the pneumatic load,...
6422532 Severe service valve positioner  
A valve positioner for adjusting the position of a valve is provided. The valve positioner includes a housing having a service cartridge port and a valve connector. The valve positioner also...
6323494 Vertical direction force transducer  
A transducer includes a pneumatic actuator in combination with a stepper motor lifter mechanism to which is opposed an attractive E-I core actuator for precise vertical positioning of a load with...
6295511 Apparatus for controlling and monitoring actuators with an open/close characteristic  
An apparatus for controlling and monitoring actuators with an open/close characteristic consists of a first unit having a drive switch unit for operating a drive force unit, at least one limit...
6171066 Automatic pneumatic pressure control apparatus and method of controlling same  
When a steplike reference signal is supplied while a switch is open, an offset signal for compensating for the dead time of a pneumatic device is generated by an offset generator and supplied as a...
6112638 Electropneumatic positioner having binary input arrangement providing access to electrical output functions thereof  
The present invention includes an electropneumatic positioner having an external binary input block which provides access to the electrical output of an integral electronic position controller to...
5983926 Flow control valve  
A first pressure chamber and a second pressure chamber are provided with means for continuously exerting a constant inward pressure on a first diaphragm part and a third diaphragm part...
5974945 Pneumatic valve positioner with adjustable gain  
A feedback control system (i.e., a positioner) for precise positioning of a pneumatic actuator by adjusting the flow of air to the pneumatic actuator comprises an adjustable gain mechanism for...
5931180 Electropneumatic positioner  
An electropneumatic positioner includes a data processing control section and an electropneumatic converter. The control section includes first and second position determining sections and a signal...
5901034 Electronic instrument  
The electronic instrument has a two-part housing (26, 27) which surrounds in a dusttight manner a printed board fitted with at least one electronic component. The housing (26, 27) contains a...
5699824 Electrical-pneumatic system  
An electrical-pneumatic system has a controller which has an input terminal for a reference variable signal, an input terminal for a regulating variable or feedback signal and an output terminal...
5682918 Pressure control valve  
A pressure control valve, which possesses a primary pressure port, a secondary pressure port and a venting port. For control of the secondary pressure a valve operating device is present which is...
5590677 Electropneumatic positioner  
An electropneumatic positioner includes an electropneumatic converter, an pilot relay, an operating unit, and a sensor. The electropneumatic converter includes a yoke having central and side leg...
5586575 Electropneumatic converter with solenoid valve control  
An electropneumatic converter controlled by solenoid valves, in which the solenoid valves are connected respectively to the feed pressure and to atmosphere, each via a pressure regulator controlled...
5542337 Electro-pneumatic valve positioning device  
A device capable of comparing the travel position of an output shaft of a diaphragm actuator or cylinder with the current level of an electronic input signal and further being capable of...
5538036 Control system for a pneumatic valve actuator  
A control system for a pneumatic valve actuator comprising three operating blocks memorizing respectively the values of the spring pressure pm, the counter-thrust pressure pc and the friction...
5533544 Supply biased pneumatic pressure relay  
An electro-pneumatic converter device with modular components and with supporting housing structure enabling the device to be readily convertible from a current to pressure positioner to a current...
5526838 Method and valve assembly for controlling a pilot signal  
A pilot signal control assembly (10) controls the pilot signal of a valve (18) which is connected to regulator, typically a booster regulator (12). The valve (18) receives air from an air supply...
5499650 Fluid control valve for a hydraulic system operating with variable viscosity, contaminated, fluid  
Problems such as slow frequency response and low reliability when operating with contaminated fluids of variable viscosity are alleviated in a low pressure hydraulic system (10) which utilizes a...
5493488 Electro-pneumatic control system and PID control circuit  
An electro-pneumatic control system and single op-amp PID control circuit is provided for regulating the output pressure response provided to a load. The control system includes a control valve for...
5469877 Electric to pneumatic transducer  
An electric to pneumatic transducer including a transducer housing with a primary converting housing section and a relay housing section. The primary converting housing section contains feedback...
5439021 Electro-pneumatic converter  
An electro-pneumatic converter device with modular components and with supporting housing structure enabling the device to be readily convertible from a current to pressure positioner to a current...
5431182 Smart valve positioner  
A valve positioner controls operation of a valve in a process control system. The valve positioner is coupled to a process control loop over which it receives a signal representative of a desired...
5392809 Hyper-reset pressure controller  
A hyper-reset pressure controller which includes two separate feedback paths which results in a substantially smoother and more accurate pressure control.
5370152 I/P converters  
A fail-safe, precision current-to-pressure converter for providing a regulated pneumatic output pressure proportional to an electrical control current includes a main valve member for regulating...
5310111 Pneumatic controller  
A pneumatic controller configured to regulate the opening and closing of a controlled device in response to a measured variable, such as temperature. The pneumatic controller includes a sensor...
5309935 Device for converting an electric current signal into a mechanical correcting variable  
A device for converting an electric current signal into a mechanical correcting variable, includes a pneumatic correcting element (1) with slide rod (2), a pneumatic amplifier (3), a compressed-air...
5282489 Fluid pressure modulator  
A pressure modulator includes an electromagnetic coil wire wound about a hollow axle for developing a magnetic field when electrical current is applied to the wire, the hollow of the axle having an...
5251148 Integrated process control valve  
An integrated process control valve includes a fluid valve body having an inlet for receiving fluid, an outlet for discharging fluid, a fluid flow passage connecting the inlet and outlet, and a...
5207737 Analog output electro-pneumatic transducer  
An electro-pneumatic pressure transducer is provided with a valve body assembly having a supply chamber, an exhaust chamber and an intake assembly to provide a source of fluid to the transducer....
5191912 Liquid level controller  
Liquid level control apparatus consisting of a valve frame with supply gas throughput through an adjustable orifice post and a float actuated release of orifice post pressure to cause a sharp...
5163464 Pneumatic pressure controller  
A motion balanced pneumatic pressure controller comprised of a tubular housing having a diaphragm for sensing a process pressure on one side and a second diaphragm for sensing a pneumatic output...
5035254 Power transmission  
An electrohydraulic servovalve comprising a torque motor which receives an electrical signal and positions a flapper between a pair of opposed nozzles to control a spool valve and a feedback spring...
5033496 Current to pressure transducer  
An electro-pneumatic transducer converts an electrical input signal into a proportional (direct or indirect) pneumatic output signal. A circuit will sense the magnitude of the input signal, monitor...
4974625 Four mode pneumatic relay  
A four-mode pneumatic relay includes a relay body defining four chambers, each coupled to a port. Two of the chambers are formed by a diaphragm assembly consisting of a rolling diaphragm coupled to...
4969487 Solenoid valve  
A solenoid valve is provided which is so constructed that reaction chambers are formed on both sides of a spool. Into the reaction chambers is introduced the loading pressure of an actuator to...
4949754 Pressure control valve for railway vehicles  
A railway car pressure control valve having an adjustable middle body member. An air supply chamber connected to a source of compressed air and an output chamber connected to an output passage. An...
4932430 Adjustable two-stage fluid pressure regulating valve  
A solenoid operated fluid pressure regulating valve includes a valve responsive to outlet pressure to control the rate of fluid flow to a burner. The valve is biased to a first position to effect a...
4925498 Pneumatic control valve  
A pneumatic control valve comprises a position controller and a valve which is influenced by the controller. A valve member can be lifted by means of a servomotor which is securely connected to the...
4917148 Load dependent valve for railway vehicles  
A load dependent valve for railway cars including first and second springs, each having one end contacting a balance piston. A first spring adjusting mechanism for adjusting the compressive force...
4898200 Electropneumatic transducer  
An electropneumatic transducer for converting an electric signal to a pneumatic pressure has a nozzle flapper mechanism and a pilot valve engaging a diaphragm assembly. The nozzle flapper mechanism...
4883089 Railway car pressure control valves  
A pressure control valve for railway vehicles having a variable control mechanism for adjusting the gain of the output pressure to input pressure by controlling the effective area ratio on opposite...
4875502 Flapper actuated pilot valve  
A flapper actuated pilot valve is shown is which the output pressure from the valve is dependent upon and proportional to the force exerted by the flapper. The valve includes a valve body with...
4874005 Current to pressure tranducer employing magnetic fluid  
A current-to-pressure transducer that is insensitive to shock employs a magnetic fluid that deforms a flexible diaphragm in response to an electrical input current that is applied to a coil and...
4855659 Electropneumatic position regulator  
An electropneumatic position regulator having a current/pressure transducer has, as electric input, at least one coil (11) fed with a current (setting signal), as well as a permanent magnet (16)...
4804009 Pneumatic interface apparatus for control of process systems  
The incremental interface system of the present invention includes a pneumatic input means for providing a first pressure to be regulated. A pressure repeater means includes a volume relay having a...
4770200 Pneumatic interface apparatus  
The interface apparatus of the present invention includes a pneumatic flow control means for controlling the number of moles of a gas confined within a substantially constant volume of gas at a...
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