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Class Information
Number: 137/84
Name: Fluid handling > Pressure modulating relays or followers > Plural series units
Description: Apparatus wherein a plurality of modulating relays on followers are connected in series; the output pressure of one controlling the modulation in the next.










Patents under this class:

Patent Number Title Of Patent Date Issued
7618391 Waveform sensing and regulating fluid flow valve Nov. 17, 2009
7267137 Deadweight pressure standards using non-hysteresis sylphons Sep. 11, 2007
6623248 System for conveying liquids without pulsing Sep. 23, 2003
6415617 Model based economizer control of an air handling unit Jul. 9, 2002
6224356 Check valve stop and ports May. 1, 2001
6171066 Automatic pneumatic pressure control apparatus and method of controlling same Jan. 9, 2001
5873946 Installation and a process for lubricating, cleaning and/or disinfecting conveyor belts Feb. 23, 1999
5439021 Electro-pneumatic converter Aug. 8, 1995
5257639 Electropneumatic positioner Nov. 2, 1993
RE34202 Dual mode pneumatic control system Mar. 30, 1993
5159949 Electropneumatic positioner Nov. 3, 1992
4953578 Dual mode pneumatic control system Sep. 4, 1990
4821760 Voice coil assembly for an electropneumatic converter Apr. 18, 1989
4804009 Pneumatic interface apparatus for control of process systems Feb. 14, 1989
4770200 Pneumatic interface apparatus Sep. 13, 1988
4760859 Modular pressure instrument Aug. 2, 1988
4715397 Pressure regulator Dec. 29, 1987
4679583 Pneumatic control system, control means therefor and method of making the same Jul. 14, 1987
4665938 Frequency feedback on a current loop of a current-to-pressure converter May. 19, 1987
4616670 High-low pressure pilot Oct. 14, 1986
4611619 Air conserving restriction for use in pneumatic systems Sep. 16, 1986
4605033 Pneumatic converter having variable gain relay stack Aug. 12, 1986
4576194 Pneumatic control system, control means therefor and method of making the same Mar. 18, 1986
4554938 Device for converting electric signals into pneumatic signals Nov. 26, 1985
4543975 Fluid pressure regulating valve mechanism Oct. 1, 1985
4534376 Electric signal to pressure signal transducer Aug. 13, 1985
4532951 Transducer utilizing electrical and pneumatic signals Aug. 6, 1985
4509403 Positioner having user-adjustable dynamic response Apr. 9, 1985
4428391 Circuit for pneumatic controllers Jan. 31, 1984
4421271 Zero energy band subbase for pneumatic thermostats Dec. 20, 1983
4336819 Pneumatic converter Jun. 29, 1982
4332269 Sloped nozzle pneumatic device Jun. 1, 1982
4314578 Fluid signal transmitting apparatus Feb. 9, 1982
4312475 Flow adjustment mechanism for air distributor systems Jan. 26, 1982
4290441 Control device and method of making the same Sep. 22, 1981
4285357 Pneumatic relay Aug. 25, 1981
4263931 Multiple load integrated fluid control units Apr. 28, 1981
4209030 Control device Jun. 24, 1980
4169485 Method of operating a control system Oct. 2, 1979
4153068 Pneumatic controller May. 8, 1979
4151953 Thermopneumatic actuator May. 1, 1979
4151856 Fluid pressure relay and output booster May. 1, 1979
4099539 Control system and control device therefor Jul. 11, 1978
4055197 Electro-proportional pressure control apparatus Oct. 25, 1977
4044651 Pneumatic function generator assembly Aug. 30, 1977
3994311 Pneumatic amplifier Nov. 30, 1976
3978876 Pneumatic pressure regulator Sep. 7, 1976
3935875 Pneumatically operated force balance transmitter and method of making the same Feb. 3, 1976











 
 
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