Pressure compensator flow control
First Claim
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1. A pressure compensating flow control device comprising:
- a housing having a upper body and a lower body wherein the upper body is sized to matingly engage the lower body;
a piston chamber formed in the housing for receiving a piston in sliding engagement, the piston chamber has a top surface, a bottom surface and at least one side wall;
a fluid inlet defined by portions of the lower body;
a fluid outlet defined by portions of the upper body;
a reducing valve situated inside the lower body wherein the reducing valve has portions defining a valve seat formed on a bottom surface of the reducing valve;
a valve stem situated in the reducing valve that modulates relative to fluid pressure whereby the reducing valve prevents fluid communication between the fluid inlet and the fluid outlet when in a closed position and allows fluid communication between the fluid inlet and the fluid outlet when in an open position;
a piston situated in the piston chamber wherein the piston slides within the housing and contacts the reducing valve and causes modulation of the reducing valve;
a piston rod aperture formed in the piston for receiving a piston rod in sliding engagement;
a piston rod situated in the piston chamber which has a channel provided therein to provide fluid communication between the inlet and the outlet;
a reference spring which registers on the top surface of the piston chamber and a top surface of the piston wherein the reference spring has an axial load compression that creates a pressure differential; and
, a needle valve for controlling fluid-flow rate and providing a set pressure differential.
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Abstract
A pressure compensating flow control device is disclosed which has a needle valve/spring assembly as a reference restriction which is in axial alignment with a reducing valve situated in a housing of the device. A piston and piston rod is provided in axial alignment with the needle valve and reducing valve to provide compensation for alterations to pressure differential about the piston. The piston rod has an internal channel to allow for fluid communication between inlet and outlet chambers and to allow for passive control of pressure differential.
The device provides pressure control for low fluid flows and low pressures.
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Citations
20 Claims
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1. A pressure compensating flow control device comprising:
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a housing having a upper body and a lower body wherein the upper body is sized to matingly engage the lower body;
a piston chamber formed in the housing for receiving a piston in sliding engagement, the piston chamber has a top surface, a bottom surface and at least one side wall;
a fluid inlet defined by portions of the lower body;
a fluid outlet defined by portions of the upper body;
a reducing valve situated inside the lower body wherein the reducing valve has portions defining a valve seat formed on a bottom surface of the reducing valve;
a valve stem situated in the reducing valve that modulates relative to fluid pressure whereby the reducing valve prevents fluid communication between the fluid inlet and the fluid outlet when in a closed position and allows fluid communication between the fluid inlet and the fluid outlet when in an open position;
a piston situated in the piston chamber wherein the piston slides within the housing and contacts the reducing valve and causes modulation of the reducing valve;
a piston rod aperture formed in the piston for receiving a piston rod in sliding engagement;
a piston rod situated in the piston chamber which has a channel provided therein to provide fluid communication between the inlet and the outlet;
a reference spring which registers on the top surface of the piston chamber and a top surface of the piston wherein the reference spring has an axial load compression that creates a pressure differential; and
,a needle valve for controlling fluid-flow rate and providing a set pressure differential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of compensating pressure fluctuations when controlling fluid flow comprising the steps of:
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providing a device comprising;
a housing having a upper body and a lower body wherein the upper body is sized to matingly engage the lower body;
a piston chamber formed in the housing for receiving a piston in sliding engagement, the piston chamber has a top surface, a bottom surface and at least one side wall;
a fluid inlet defined by portions of the lower body;
a fluid outlet defined by portions of the upper body;
a reducing valve situated inside the lower body wherein the reducing valve has portions defining a valve seat formed on a bottom surface of the reducing valve;
a valve stem situated in the reducing valve that modulates relative to fluid pressure whereby the reducing valve prevents fluid communication between the fluid inlet and the fluid outlet when in a closed position and allows fluid communication between the fluid inlet and the fluid outlet when in an open position;
a piston situated in the piston chamber wherein the piston slides within the housing and contacts the reducing valve and causes modulation of the reducing valve;
a piston rod aperture formed in the piston for receiving a piston rod in sliding engagement;
a piston rod situated in the piston chamber which has a channel provided therein to provide fluid communication between the inlet and the outlet;
a reference spring which registers on the top surface of the piston chamber and a top surface of the piston wherein the reference spring has an axial load compression that creates a pressure differential; and
,a needle valve for controlling fluid-flow rate and providing a set pressure differential;
introducing fluid into the device;
adjusting the needle valve to regulate fluid flow; and
,regulating the fluid pressure by having the reference spring sense the pressure that causes modulation of the piston, which, in turn, causes modulation of the reducing valve.
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Specification