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US 4,936,340 AGranted
Pressure regulator
AssigneeCoretest Systems, Inc.
InventorsJared M. Potter, Douglas N. Sweet
Life of this patent
Estimating the term…
Abstract
A pressure control assembly is disclosed. The assembly includes a pressure transducer for detecting upstream pressure. A diaphragm is used to regulate flow through the assembly, and is forced into a closed position by pressure from a fluid column. The pressure on the fluid column is controlled by a piston driven by a step motor. The step motor is activated in response to signals from the pressure transducer.
Claims11
A valve for controlling pressure in a flow line comprising:
- (a) means for detecting pressure in said flow line;
- (b) a diaphragm in contact with said flow line;
- and
- (c) means, responsive to said means for detecting, for increasing a pressure in a liquid filled region, said liquid filled region in contact with and urging said diaphragm into said flow line to restrict flow therein, said means for increasing pressure further comprises:
- (i) an electric motor driven pump means in contact with said liquid filled region;
- and
- (ii) a controller for receiving a signal from said means for detecting pressure and activating said motor in response thereto.
4 more elements
A valve for controlling pressure in a flow line comprising:
- (a) means for detecting pressure in said flow line;
- (b) a diaphragm in contact with said flow line;
- (c) means, responsive to said means for detecting, for increasing a pressure in a liquid filled region, said liquid filled region in contact with and urging said diaphragm into said flow line to restrict flow therein, said means for increasing pressure further comprising:
- (i) an electric motor driven pump means in contact with said liquid filled region;
- and
- (ii) a controller for receiving a signal from said means for detecting pressure and activating said motor in responsive thereto, said controller further comprising:
- means for supplying a reference voltage;
- means for comparing a voltage from said means for detecting pressure to said reference voltage;
- and
- a driver adapted to activate said motor in response to an output from said means for comparing;
- (d) means for detecting a pressure in said liquid filled region;
- (e) means for comparing a second reference voltage to a voltage representative of said pressure in said liquid filled region to provide a restriction output;
- and
- (f) means for restricting movement of said piston based on said restriction output.
11 more elements
Apparatus for regulating pressure in a flow line comprising:
- (a) an inlet flow line, said line, said inlet flow line having a pressure transducer therein;
- (b) a vent flow line;
- (c) a diaphragm between said inlet flow line and said discharge flow line for restricting flow from said inlet flow line to said vent line;
- (d) a liquid filled region adjacent said diaphragm opposite said flow lines;
- (e) a piston in said liquid filled region;
- (f) a step motor driven ball screw and ball nut for urging said piston into said liquid filled region;
- (g) a spring for urging said piston out of said liquid filled region;
- (h) a control means, said control means further comprising:
- (i) means for generating a reference voltage;
- (ii) means for comparing said reference voltage to a voltage from said pressure transducer;
- and
- (iii) means for activating said motor in responsive to said means for comparing;
- and
- (i) a pressure transducer in said liquid filled region, said transducer monitoring pressure in said liquid filled region for overpressure or underpressure.
11 more elements
Dependencies are inferred from the claim text.