Valve Cap

Inactive Publication Date: 2010-12-23
SPICKET VALVES & PUMPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]By locking the compression unit to the plug, the docking unit can be removed to be used on any number of compression units and plug combinations. Additionally as the pistons are independent of the springs, a large number of springs can be used to distribute load on the plug without the need to find space for the pistons. The large number of springs also allows maximum uplift on the plug (due to mud pressure incl. peak pressures) to be fully restrained.

Problems solved by technology

It will be appreciated that parts within the pump exposed to the fluid and its associated pressure are liable to wear easily.
A disadvantage of this valve cap is in the use of threaded connections.
It is difficult to determine if the threads are correctly tightened.
During mud pump operation, the reciprocating nature and peak pump pressures acts on any insufficiently tightened connections, resulting in a tendency for the valve cap to gradually loosen.
Alternatively, the threaded connections have been over tightened, making it even more difficult to unthread.
Additionally, in using a steel bar it is often necessary to hammer the bar to release the cap.
Such activity is obviously dangerous.
A disadvantage of this cap is in the large dimensions of the cap and the respective face on the end piece required.
As a result these caps are generally limited to a maximum of four cylinders which has the disadvantage of causing an uneven pressure to be applied to the body.

Method used

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Embodiment Construction

[0063]Reference is initially made to FIG. 3 of the drawings which illustrates a valve cap, generally indicated by reference numeral 10, according to an embodiment of the present invention. Valve cap 10 is used for sealing an aperture 12 at a fluid end 14 of a pump. Cap comprises a valve plug 16 which locates against a wall 18 of the aperture 12, a compression unit 20 which is fastened to the end 14 via stud rods 22 and a docking unit 24 for landing on the compression unit.

[0064]Reference is now made to FIG. 4 of the drawings which illustrates the valve plug 16 in greater detail. Plug 16 comprises a two part cylindrical body having upper body 26 and a lower body 28. The bodies 26, 28 are bolted together via bolts 29a-d and a seal 30 is provided at the join to prevent the ingress of fluid there between. At the join is also located a plug seal 32 which is arranged longitudinally on an outer surface 34 of the plug 16.

[0065]An upper end of the outer surface 34 together with a top surface...

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Abstract

There is disclosed a valve cap for sealing an aperture in a pump; a plugging assembly for use in a valve cap to provide a seal at an aperture in a pump; a docking unit for use with a plugging assembly for sealing an aperture in a pump; and a method of sealing an aperture in a pump. In an embodiment of the invention, a valve cap (10) for sealing an aperture (12) in a pump is disclosed which comprises a valve plug (16) for locating against a wall (18) of the aperture, the plug including, a first engaging means (40); a compression unit (20) fastened to the pump, the compression unit including a plurality of springs (56) to apply a compressive load upon the plug and second engaging means (62, 64); a docking unit (24) for landing on the compression unit, the docking unit including one or more pistons (92) to apply a compressive load upon said springs and third engaging means (74, 76, 78); wherein said first and third engaging means sequentially interlock with said second engaging means to lock said plug to said compression unit and seal said plug against said aperture.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]This application is a continuation of U.S. Ser. No. 11 / 568,911 filed May 4, 2005, now U.S. Pat. No. 7,770,509, which is a national stage application of PCT / GB05 / 01673, filed May 4, 2005.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicableTHE NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT[0003]Not applicableINCORPORATION BY REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC[0004]Not applicableBACKGROUND OF THE INVENTION[0005](1) Field of the Invention[0006]The present invention relates to valve caps and in particular, though not exclusively, to a valve cap for use on a hole in a mud-pump fluid-end module.[0007](2) Description of Related Art including information disclosed under 37 CFR 1.97 and 1.98[0008]In the oil industry mud pumps are used to pump viscous fluids, such as drilling muds, cement, or other well fluids. Although mud pumps may be either centrifugal or reciprocating type pumps, typically mud pump...

Claims

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Application Information

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IPC IPC(8): F01B29/00F04B53/00F04B47/08F04B53/16F04B53/22
CPCF04B47/08Y10T29/494F04B53/16F04B53/00F04B53/22
InventorKENNEDY, GEORGE COULTERSOURDOIS, GUILLAUME
OwnerSPICKET VALVES & PUMPS