Flow control valve and method for rebuilding a flow control valve
First Claim
Patent Images
1. A method for rebuilding a flow control valve, comprising the steps of:
- providing a flow control valve having a rotor positioned in a chamber of a valve body, and the rotor having a valve stem, which has an outside diameter, and a top cover plate mounted to the valve body having a first bore through which the valve stem protrudes, and the first bore having a diameter;
removing the top cover plate and rotor from the valve body;
reducing the outside diameter of at least a portion of the valve stem to a predetermined outside diameter;
positioning a bushing on the valve stem over the portion of the valve stem of which the diameter has been reduced;
forming a second bore in the top cover plate that is coaxially aligned with respect to the first bore and the second bore having a diameter that is larger than the diameter of the first bore thereby forming a lip between the first bore and second bore;
positioning a seal on the lip in the top cover plate;
inserting the rotor into the valve chamber of the valve body; and
positioning the top cover plate over the rotor so the valve stem protrudes through the first bore and second bore in the top cover plate, and the seal is disposed between the top cover plate and the bushing on the valve stem.
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Accused Products
Abstract
A method for rebuilding a flow control valve, may be performed by first providing a flow control valve having a rotor positioned in a chamber of a valve body. The rotor has a valve stem. A top cover plate is mounted to the valve body above the rotor and has a first bore through which the valve stem protrudes. The top cover plate is removed so the rotor can be removed from the valve body. A seal is positioned on the top cover plate along the first bore so that when the rotor and top cover plate are placed in or on the valve body, the flow control valve is sealed at the interface between the top cover plate and the valve stem.
16 Citations
8 Claims
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1. A method for rebuilding a flow control valve, comprising the steps of:
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providing a flow control valve having a rotor positioned in a chamber of a valve body, and the rotor having a valve stem, which has an outside diameter, and a top cover plate mounted to the valve body having a first bore through which the valve stem protrudes, and the first bore having a diameter; removing the top cover plate and rotor from the valve body; reducing the outside diameter of at least a portion of the valve stem to a predetermined outside diameter; positioning a bushing on the valve stem over the portion of the valve stem of which the diameter has been reduced; forming a second bore in the top cover plate that is coaxially aligned with respect to the first bore and the second bore having a diameter that is larger than the diameter of the first bore thereby forming a lip between the first bore and second bore; positioning a seal on the lip in the top cover plate; inserting the rotor into the valve chamber of the valve body; and positioning the top cover plate over the rotor so the valve stem protrudes through the first bore and second bore in the top cover plate, and the seal is disposed between the top cover plate and the bushing on the valve stem. - View Dependent Claims (2, 3, 5, 6)
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4. The method of claim I wherein the flow control valve has a plurality of seal pads disposed between the rotor and the valve body, and the method comprises the steps of removing the seal pads, cleaning the seal pads and inserting the seal pads in the valve body between the rotor and valve body.
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7. A method for rebuilding a flow control valve, comprising the steps of:
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providing a flow control valve having a rotor positioned in a chamber of a valve body, and the rotor having a valve stem having an outside diameter, and the flow control valve having a top cover plate mounted thereon wherein the top cover plate has a first bore through which the valve stem protrudes; removing the top cover plate from the flow control valve; removing the rotor from the valve body; reducing an outside diameter of at least a portion of the rotor valve stem; adapting the valve stem to account for the reduced diameter; positioning a seal on the top cover plate along the first bore by forming a second bore in the top cover plate that is coaxially aligned with respect to the first bore and the second bore having a diameter that is larger than the diameter of the first bore thereby forming a lip between the first bore and second bore, and positioning the seal on the lip in the top cover plate; inserting the rotor into the valve chamber of the valve body; and positioning the top cover plate over the rotor so the valve stem protrudes through the first bore in the top cover plate, and the seal is disposed between the top cover plate and the valve stem.
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8. A method for rebuilding a flow control valve, comprising the steps of:
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providing a flow control valve having a rotor positioned in a chamber of a valve body, and the rotor having a valve stem having an outside diameter, and the flow control valve having a top cover plate mounted thereon wherein the top cover plate has a first bore through which the valve stem protrudes; removing the top cover plate from the flow control valve; removing the rotor from the valve body; reducing an outside diameter of at least a portion of the rotor valve stem to a predetermined outside diameter; adapting the valve stem to account for the reduced diameter; positioning a bushing on the valve stem over the portion of the valve stem of which the diameter has been reduced; positioning a seal on the top cover plate along the first bore; inserting the rotor into the valve chamber of the valve body; and positioning the top cover plate over the rotor so the valve stem protrudes through the first bore in the top cover plate, and the seal is disposed between the top cover plate and the valve stem.
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Specification