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Class Information
Number: 137/86
Name: Fluid handling > Pressure modulating relays or followers > With counter-balancing pressure feedback to the modulating device > With counter-counter balancing pressure feedback
Description: Apparatus in which the modulated pressure is utilized in a second feedback arrangement to counterbalance the counterbalance of the modulating control element.

Patents under this class:

Patent Number Title Of Patent Date Issued
8644996 Positioner Feb. 4, 2014
6959703 Paintball gun throttle regulator device Nov. 1, 2005
6655404 Actuator control device Dec. 2, 2003
5558115 Valve positioner with pressure feedback, dynamic correction and diagnostics Sep. 24, 1996
5549137 Valve positioner with pressure feedback, dynamic correction and diagnostics Aug. 27, 1996
5163471 Low-pressure pilot valve Nov. 17, 1992
4938789 Raw material supplying device and process Jul. 3, 1990
4768555 Solenoid valve Sep. 6, 1988
4634047 Thermostatically adjustable pressure regulator Jan. 6, 1987
4510961 Pneumatic controller Apr. 16, 1985
4453559 Pneumatic controller Jun. 12, 1984
4449546 Controller with adjustable proportionality range May. 22, 1984
4428391 Circuit for pneumatic controllers Jan. 31, 1984
4417599 Vacuum signal integrator Nov. 29, 1983
4291717 Proportional stroke automatic temperature control system Sep. 29, 1981
4282781 Transmission throttle valve of automatic power transmission Aug. 11, 1981
4282781 Transmission throttle valve of automatic power transmission Aug. 11, 1981
4253484 Valve operator Mar. 3, 1981
4231385 Pneumatic controller Nov. 4, 1980
4203817 Method of and device for moving liquid samples May. 20, 1980
4153068 Pneumatic controller May. 8, 1979
4094463 System having reset action Jun. 13, 1978
4083375 Pilot regulator Apr. 11, 1978
4030521 Method for liquid level control Jun. 21, 1977
3981318 Pneumatic output signal limiting device Sep. 21, 1976

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