Dean H Crombie Deceased1642 Highfield Ln, Brentwood, TN 37027

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1642 Highfield Ln, Brentwood, TN 37027

East Windsor, CT

14520 Aeries Way Dr, Fort Myers, FL 33912

Brookfield, CT

Tucson, AZ

Tempe, AZ

Ellington, CT

Danbury, CT

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Us Patents

Fluid-Operated Apparatus Exhibiting Hysteresis Effect

US Patent:
3968729, Jul 13, 1976
Filed:
Oct 29, 1974
Appl. No.:
5/518491
Inventors:
Kenneth P. Hansen - Enfield CT
Dean H. Crombie - Ellington CT
Assignee:
United Technologies Corporation - Hartford CT
International Classification:
F15B 13042
US Classification:
91 32
Abstract:
A fluid-operated apparatus receiving an input pressure signal exhibits a hysteresis or deadband effect by responding to an increasing pressure signal at a first level and a decreasing signal at a second and lower level. The apparatus includes a spool valve to which the input pressure signal is applied at one end of the spool. The opposite end of the spool having a given cross sectional area projects into a pressure chamber and contacts the poppet of a poppet valve held closed by a regulated pressure in opposition to forces produced by the spool. The seat of the poppet valve surrounds an opening into the pressure chamber so that the regulated pressure is admitted into the pressure chamber when the spool pushes the poppet open. The effective area of the valve seat is greater than the cross sectional area of the spool end engaging the poppet so that the force or input pressure signal required to move the spool and open the poppet valve is greater than that which permits the spool to return and close the poppet valve. A hysteresis or deadband effect determined by the different cross sectional areas is manifested by the spool movements and a hydraulic mechanism controlled by those movements.

Automatic Vent For Fuel Control

US Patent:
4449359, May 22, 1984
Filed:
Jun 26, 1981
Appl. No.:
6/277492
Inventors:
Edward F. Cole - Glastonbury CT
Dean H. Crombie - Ellington CT
Assignee:
United Technologies Corporation - Hartford CT
International Classification:
F02C 928
US Classification:
60 39094
Abstract:
This invention relates to the fuel system of a gas turbine power plant and modifies a conventional fuel control to automatically vent trapped air contained in the fuel control and fuel distribution system into the engine's burners by bypassing the conventional minimum pressure and shut off valve. This serves to prime the main fuel pumps when running dry during the switching of one fuel tank to another.

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