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Class Information
Number: 137/85
Name: Fluid handling > Pressure modulating relays or followers > With counter-balancing pressure feedback to the modulating device
Description: Apparatus in which the modulated pressure is utilized in a feedback arrangement to counterbalance the modulating control element.










Sub-classes under this class:

Class Number Class Name Patents
137/86 With counter-counter balancing pressure feedback 24


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8622072 Apparatus to control fluid flow Jan. 7, 2014
8459289 Electro-pneumatic positioner and electro-pneumatic converting device Jun. 11, 2013
8215329 Digital closed loop proportional hydraulic pressure controller Jul. 10, 2012
7766030 High pressure transducer Aug. 3, 2010
7337041 Feedback control methods and apparatus for electro-pneumatic control systems Feb. 26, 2008
7234483 Electro-pneumatic air pressure regulator Jun. 26, 2007
6527862 Flow controller Mar. 4, 2003
6422532 Severe service valve positioner Jul. 23, 2002
6348098 Flow controller Feb. 19, 2002
6323494 Vertical direction force transducer Nov. 27, 2001
6295511 Apparatus for controlling and monitoring actuators with an open/close characteristic Sep. 25, 2001
6240955 Liquid level controller Jun. 5, 2001
6171066 Automatic pneumatic pressure control apparatus and method of controlling same Jan. 9, 2001
6112638 Electropneumatic positioner having binary input arrangement providing access to electrical output functions thereof Sep. 5, 2000
5992448 Liquid level controller Nov. 30, 1999
5983926 Flow control valve Nov. 16, 1999
5974945 Pneumatic valve positioner with adjustable gain Nov. 2, 1999
5931180 Electropneumatic positioner Aug. 3, 1999
5901034 Electronic instrument May. 4, 1999
5699824 Electrical-pneumatic system Dec. 23, 1997
5682918 Pressure control valve Nov. 4, 1997
5590677 Electropneumatic positioner Jan. 7, 1997
5586575 Electropneumatic converter with solenoid valve control Dec. 24, 1996
5542337 Electro-pneumatic valve positioning device Aug. 6, 1996
5538036 Control system for a pneumatic valve actuator Jul. 23, 1996
5533544 Supply biased pneumatic pressure relay Jul. 9, 1996
5526838 Method and valve assembly for controlling a pilot signal Jun. 18, 1996
5499647 Method and valve assembly for controlling a pilot signal Mar. 19, 1996
5499650 Fluid control valve for a hydraulic system operating with variable viscosity, contaminated, fluid Mar. 19, 1996
5493488 Electro-pneumatic control system and PID control circuit Feb. 20, 1996
5469877 Electric to pneumatic transducer Nov. 28, 1995
5439021 Electro-pneumatic converter Aug. 8, 1995
5431182 Smart valve positioner Jul. 11, 1995
5392809 Hyper-reset pressure controller Feb. 28, 1995
5370152 I/P converters Dec. 6, 1994
5309935 Device for converting an electric current signal into a mechanical correcting variable May. 10, 1994
5310111 Pneumatic controller May. 10, 1994
5282489 Fluid pressure modulator Feb. 1, 1994
5251148 Integrated process control valve Oct. 5, 1993
5207737 Analog output electro-pneumatic transducer May. 4, 1993
5191912 Liquid level controller Mar. 9, 1993
5163464 Pneumatic pressure controller Nov. 17, 1992
5163463 Mechanical flexure for motion amplification and transducer with same Nov. 17, 1992
5035254 Power transmission Jul. 30, 1991
5033496 Current to pressure transducer Jul. 23, 1991
4997002 Power transmission Mar. 5, 1991
4974625 Four mode pneumatic relay Dec. 4, 1990
4969487 Solenoid valve Nov. 13, 1990
4949754 Pressure control valve for railway vehicles Aug. 21, 1990
4932430 Adjustable two-stage fluid pressure regulating valve Jun. 12, 1990

1 2 3 4










 
 
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