Gas pressurized packing system for control valves
AssigneeFisher Controls International LLC
InventorMichael Wildie McCarty
Life of this patent
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Abstract
A gas pressurized packing system for use in a control valve is disclosed. The gas pressurized packing system may include a first packing member, a second packing member and a pressurized gas supply. The first and second packing members may be arranged about, respectively, lower and upper portions of an operating member that extends through a bore in the control valve. The pressurized gas supply may be configured to pressurize a portion of the bore arranged between the first and second packing members. Also disclosed are a low fugitive emission control valve and a low fugitive emission control valve system.
Claims20
A low fugitive emission control valve comprising:
- a valve body including an inlet, an outlet and a flow passage extending between the inlet and the outlet;
- a bonnet mounted to the valve body and having a bore that opens into the valve body;
- an operating member extending through the bore and operatively connected to a control member arranged in the flow passage, the operating member being configured to move the control member between a closed position and an open position to open and close the flow passage;
- a first packing member arranged in the bore about a lower portion of the operating member;
- a second packing member arranged in the bore about an upper portion of the operating member;
- a gas supply port extending through the bonnet and opening into the bore at a location between the first packing member and the second packing member;
- and
- a pressurized gas supply configured to pressurize the bore via the gas supply port to inhibit fugitive emissions.
A gas pressurized packing system for use in a control valve including a valve body with a flow passage, a bonnet mounted to the valve body, a bore extending through the bonnet and opening into the valve body, an operating member extending through the bore and operatively connected to a control member arranged in the flow passage, the packing system comprising:
- a first packing member configured to be arranged in the bore about a lower portion of the operating member;
- a second packing member configured to be arranged in the bore about an upper portion of the operating member;
- and
- a pressurized gas supply configured to pressurize a portion of the bore arranged between the first packing member and the second packing member.
A low fugitive emission control valve system comprising:
- a plurality of control valves, each of the control valves including:
- a valve body including an inlet, an outlet and a flow passage extending between the inlet and the outlet;
- a bonnet mounted to the valve body and having a bore that opens into the valve body;
- an operating member extending through the bore and operatively connected to a control member arranged in the flow passage, the operating member being configured to move the control member between a closed position and an open position to open and close the flow passage;
- a first packing member arranged in the bore about a lower portion of the operating member;
- a second packing member arranged in the bore about an upper portion of the operating member;
- and
- a gas supply port extending through the bonnet and opening into the bore at a location between the first packing member and the second packing member;
- and
- a pressurized gas supply line configured to pressurize the bores of the control valves via the respective gas supply ports.
Dependencies are inferred from the claim text.