Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Reexamination Certificate
1999-01-15
2001-05-15
Thorpe, Timothy S. (Department: 3746)
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
C137S512500, C137S493800, C137S493900
Reexamination Certificate
active
06231323
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to high pressure reciprocating pumps of the type used in high pressure water jet applications, and more particularly to an improved valve cartridge for fitting between pump elements.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,878,815 dated Nov. 7, 1989 shows a high pressure reciprocating pump utilizing high pressure water jet cleaning for producing fluid pressure up to 35,000 psi. When higher pressures are encountered, such as pressures in the range of 50,000 psi to 60,000 psi, stress concentrations at such high fluid pressure result in undue wear and cracks, particularly adjacent the entrances to discharge flow holes or openings through which the high pressure fluid is discharged on the power stroke. Stress concentrations are high at the comers of the openings and hard alloy materials for such areas are expensive and difficult to machine or round at the comers where the stress concentrations occur. Particularly where small diameter openings are provided for very high fluid pressures, the corners or entrances to such small diameter openings are difficult for machine or chamfer.
As shown in the '815 patent, the plunger in the suction stroke results in opening of the suction valve to permit fluid within the pump chamber. Then, during the following power stroke, the high fluid pressure is discharged from the pump chamber through a plurality of relatively small discharge holes or openings into a large discharge port. The corners of the entrances to the plurality of relatively small discharge openings are subjected to stress concentrations from the high fluid pressure during the power stroke which results in wear and some cracks at very high pressures encountered.
An object of the invention is to provide a high pressure reciprocating pump for high fluid pressures between 30,000 and 60,000 psi in which high stress concentrations are minimized.
Another object of the invention is to provide such a high pressure reciprocating pump in which a replaceable valve cartridge is utilized.
SUMMARY OF THE INVENTION
The present invention is directed particularly to an improved valve cartridge for fitting within the manifold block of a high pressure reciprocating pump as illustrated generally in U.S. Pat. No. 4,878,815. The valve cartridge fits between the manifold block and the adjacent mounting plate and can be easily removed and replaced upon disassembly of the mounting plate from the manifold block.
The valve cartridge of the present invention includes a fixed body of a generally frusto-conical shape with a plurality of equally spaced relatively small diameter suction openings extending through the body and providing fluid communication between an annular suction chamber and the pump chamber. A valve assembly is mounted within a central bore of the cartridge body including a generally cylindrical discharge valve member having a central bore and a plurality of lateral slots extending through the wall of the discharge valve member at the valve seat adjacent an end of the discharge valve member. In the power stroke from a piston or plunger, the pressurized water forced from the pump chamber acts against a closed end of the discharge valve member and opens the discharge valve member with pressurized water flowing through the lateral slots past the valve seat into a discharge port.
An annular suction valve member fits about the cylindrical discharge valve member over the suction openings in the cartridge body. The suction valve member is spring biased between the suction valve member and the discharge valve member to a normally closed position over the suction openings. In the suction stroke, the suction valve member moves to an open position relative to the suction openings to permit the pressurized water to be drawn within the pump chamber through the plurality of relatively small diameter suction openings. Thus, the small diameter suction openings are not exposed to very high fluid pressures such as 50,000 psi. The relatively large lateral openings in the discharge valve member are exposed to very high fluid pressures but relatively small stress concentrations occur and high alloy metals can easily be provided along the surfaces of the relatively large lateral openings in the discharge valve member to minimize wear.
Other features and advantages of the invention will become apparent from the following specifications and drawings.
REFERENCES:
patent: 3702624 (1972-11-01), Fries
patent: 4552180 (1985-11-01), Mayer
patent: 4878815 (1989-11-01), Stachowiak
patent: 5241986 (1993-09-01), Yie
patent: 5662188 (1997-09-01), Ito et al.
Bushman Browning
Jetstream of Houston, Inc.
Solak Timothy P.
Thorpe Timothy S.
LandOfFree
High pressure reciprocating pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High pressure reciprocating pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High pressure reciprocating pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2466068