Flow Control Valve and Method for Rebuilding a Flow Control Valve
First Claim
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.
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Citations
19 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, 4, 5, 6)
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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, 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; 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. - View Dependent Claims (8, 9)
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10. A method for rebuilding a flow control valve comprising the steps of:
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providing a butterfly valve having a valve body, a disc-shaped valve mounted to the valve body and a valve stem connected to the valve wherein the valve stem is positioned within a housing and is attached to a bushing mounted within the housing, and the bushing having a base section and a top section to which an o-ring is attached, removing the bushing from the housing; removing the o-ring; reducing a height of bushing by removing a predetermined portion of the top section; positioning the o-ring on the top section of the bushing; positioning a seal within the housing;
inserting the bushing in the housing and onto the valve stem whereby the seal abuts the o-ring on the bushing and the top section of the bushing. - View Dependent Claims (11, 12, 13)
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14. A flow control valve, comprising:
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a rotor positioned in a chamber of a valve body, and the rotor having a valve stem; a top cover plate mounted to the valve body above the rotor and having a first bore and a second bore through which the valve stem protrudes, the second bore is coaxially aligned with respect to the first bore and the second bore having a diameter that is larger than a diameter of the first bore thereby forming a lip between the first bore and second bore; and
,a seal positioned on the lip in the top cover plate and abutting the valve stem. - View Dependent Claims (15, 16, 17)
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18. A flow control valve comprising:
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a circular valve body; a disc-shaped valve mounted to the valve body; a valve stem connected to the valve wherein the valve stem is positioned within a housing and is attached to a bushing mounted within the housing, and the bushing having a base section and a top section an o-ring attached to the top section of the bushing and abutting an inside surface of the housing and an outside surface of the bushing; and a seal positioned within the housing above the bushing, and a bottom surface of the seal abutting the o-ring and a top of the bushing, the seal extending annularly around the valve stem an abutting an inside surface of the housing and an outside surface of the valve stem. - View Dependent Claims (19)
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Specification