Valve packing having independently loaded packing rings
AssigneeFisher Controls International LLC
InventorBrett Allen Hofman
Life of this patent
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Abstract
A valve packing having independently loaded packing rings is disclosed. A packing assembly for a fluid valve includes a first packing ring, a first follower to be disposed at least partially within a bore of a bonnet of the fluid valve to apply a first load to the first packing ring, a second packing ring sized to fit within a bore of the first follower, and a second follower to be disposed at least partially within the bore of the first follower to apply a second load to the second packing ring within the bore of the first follower.
Claims20
A packing assembly for a fluid valve, the packing assembly comprising:
- a first packing ring sized to fit within a bore of a bonnet of the fluid valve;
- a first follower to be disposed at least partially within the bore of the bonnet, the first follower to apply a first load to the first packing ring, the first follower coupled to the bonnet via a first fastener external to the bonnet, wherein a first tightening torque of the first fastener determines at least a portion of the first load;
- a first spring sized to fit within the bore of the bonnet between the first packing ring and the first follower;
- a second packing ring sized to fit within a bore of the first follower;
- and
- a second follower to be disposed at least partially within the bore of the first follower, the second follower to apply a second load to the second packing ring within the bore of the first follower, the second follower coupled to the first follower and the bonnet via a second fastener, wherein a tightening torque of the second fastener determines the second load and at least a portion of the first load.
An apparatus to seal a valve, the apparatus comprising:
- a first packing ring disposed in a valve bonnet and coupled to a first surface of a first spring disposed in the valve bonnet;
- a first follower coupled to a second surface of the first spring, the second surface of the first spring opposite of the first surface of the first spring, the first follower coupled to a flange of the valve bonnet via a first fastener, wherein a first tightening torque of the first fastener determines at least a portion of a first load;
- a second packing ring disposed on a surface of the first follower, the surface of the first follower spaced apart from the first spring, the second packing ring coupled to a first surface of a second spring;
- and
- a second follower coupled to a second surface of the second spring, the second surface of the second spring opposite of the first surface of the second spring, the second follower coupled to the first follower and the flange via a second fastener, wherein a tightening torque of the second fastener determines at least a portion of the first load for the first follower and a second load for the second follower.
A valve, comprising:
- a bonnet including a first bore;
- a first packing ring disposed within the first bore;
- a first follower disposed at least partially within the first bore, the first follower including a second bore, the first follower to apply a first load to the first packing ring, the first follower coupled to the bonnet via a first fastener, wherein a first tightening torque of the first fastener determines at least a portion of the first load;
- a first spring disposed within the first bore between the first packing ring and the first follower;
- a second packing ring disposed within the second bore;
- and
- a second follower disposed at least partially within the second bore, the second follower to apply a second load to the second packing ring, the second follower coupled to the first follower and the bonnet via a second fastener, wherein a tightening torque of the second fastener determines the second load and at least a portion of the first load.
Dependencies are inferred from the claim text.