Stewart Warner Corporation

Woodward Governor Company

Mark C Kao

Myron J Johnson

Daniel J McLevige

Thomas E Bjorn

A differential pressure regulator connected in a fluid system including a bypass line and including a valve body with a high pressure inlet and a compensation inlet connected to the high pressure side of the system, a low pressure inlet, and a bypass outlet. A valve member is reciprocable within the valve housing and includes an intermediate passage between the compensation inlet and the bypass outlet, a metering port between the intermediate passage and the bypass outlet, and a compensating port between the compensating inlet and the intermediate passage. The position of this valve member controls the degree of opening of the ports. Also included is spring biasing the valve toward the closed position of the ports. The high and low pressure inlets are coupled to high and low pressure faces on the valve member, and the resulting forces act with the spring force to adjust bypass flow to achieve the substantially constant pressure drop. A compensating chamber including an inlet connected to the intermediate passage and a third pressure face is disposed such that pressure applied to the third pressure face results in a compensating force which moves the valve member toward the closed position of the ports. The pressure applied to the third pressure face is dependent on a compensating pressure drop across the compensating port. The compensating port is sized and positioned to cause a pressure drop varying as a function of valve position to compensate for increased forces tending to close the bypass port at high bypass flows.

Dedrooped bypass valve

A self-cleaning restrictor assembly for a high pressure lubricant valve that minimizes the effect of accidental discharge by reducing no load outlet flow. The restrictor assembly has a pair of restrictors that are alternately opened and closed to provide a constant restricted flow area while easily passing any foreign material.

High pressure lubricant control valve with self-cleaning restrictor

A runaway valve for an air-driven material pump that shuts off air flow to the pump when air flow rate exceeds a predetermined setting to prevent pump damage, wherein the valve includes a flow-responsive poppet valve member and an axially movable sleeve finely adjustable about a first position to select flow rate, and movable to a second position to interconnect the upstream and downstream sides of the poppet valve member to effect reset. A closed chamber with a vent hole buffers the upstream side of the poppet valve member from inlet pressure to delay valve closing and compensate for pressure transients. In its reset position, the sleeve isolates this chamber from inlet pressure to achieve faster reset.

Runaway protective fuse valve

An airless paint or material spray system having a pressure sensor and regulator for controlling the pressure of paint flowing from a paint pump to an airless spray gun. The pressure sensor and regulator includes three contiguous flexing diaphragms in a material chamber in the outlet flow line of the pump with the outermost diaphragm in direct contact with material being constructed of a thin plastic impervious to attack by common painting or coating materials. The two other diaphragms are rubber coated fabric diaphragms that axially position a precision steel rod movably mounted in a low clearance bore in a regulator housing. The axial movement of the precision rod is converted to rotational movement by an adjustably spring biased, pivotally mounted member in the housing having a universal connection with the precision rod. A normally closed snap action switch in the housing is actuated after a predetermined axial travel of the precision rod by an amplifier bar connected to the pivotally mounted member. This snap action switch is adapted to energize a dumping valve in the outlet of the pump at approximately 60 cycles per minute to maintain a desired pump outlet pressure.

Growing community of inventors

Elmhurst, IL, United States of America

Mark C Kao