Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1994-11-14
1997-03-11
Thorpe, Timothy
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417571, 1375395, F04B 5310
Patent
active
056094779
DESCRIPTION:
BRIEF SUMMARY
RELATED APPLICATION
This is the U.S. national stage application of international application PCT/US93/02379 filed Mar. 12, 1993.
FIELD OF THE INVENTION
This invention relates to high pressure fluid intensifier systems. More particularly, this invention relates to check valve assemblies for controlling fluid flow into and out of the high pressure intensifier chamber.
BACKGROUND OF THE INVENTION
In a typical high pressure fluid intensifier system, hydraulic fluid acts on a reciprocating double-acting, low pressure-high pressure piston assembly to compress water to over several thousand psi. The piston assemblies of such systems are exposed to hydraulic fluid pressures on the order of 2,000 psi and to outlet water pressures on the order of 20-60,000 psi. These assemblies must be designed to withstand tremendous pressure fluctuations while at the same time maintain hydraulic fluid/water separation.
The inlet and outlet valve members of the pressurized fluid check valve assembly and their valve seats are severely stressed. Replacement of the valve members and their seats periodically is difficult because of the attachment of the various members making up the intensifier pressure chambers and piston assembly. Usually, the intensifier must be completely dismantled to reach and repair or replace such internal elements.
In my U.S. Pat. No., 4,818,194, I describe a check valve assembly that is designed to be accessible for service without dismantling the intensifier appurtenant thereto. In this patent, the check valve assembly is so arranged that the high pressure water outlet portion is provided at the outer end of the assembly adapter. In this design, removal of the adapter exposes the high pressure valve element and its seat for service or replacement. Also in this design, the inner low pressure end of the check valve assembly, which requires service less often, is accessible when the entire assembly is removed from the intensifier. A check valve retainer ring secures the assembly to the intensifier, in this design, and the retainer ring is easily removed so that the check valve assembly can be removed without dismantling the intensifier. When the various parts are serviced or replaced, it is a simple matter, in this design to re-install the check valve assembly in full working condition, without having to be concerned about the relative alignment of the other components that make up the complete intensifier system.
SUMMARY OF THE INVENTION
The check valve assembly of this invention is designed similarly to the assembly described in my U.S. Pat. No., 4,818,194. A similar valve body and check valve retainer ring concept is employed to secure the check valve mechanism to the intensifier. The operating components within the valve body, however, are different. The internal valve mechanism provided by the present invention comprises a high pressure ball poppet sub-assembly for the outlet flow that is conveniently accessible for service or replacement when the valve body remains installed in the intensifier assembly. This ball poppet configuration could also be a flat poppet type which may be superior in some pressure ranges. A flat poppet and seat open to permit inflow water in the high pressure barrel. The inlet poppet is guided in such a way as to insure nearly perfect parallelism of the sealing surfaces at the instant of contact. This is extremely important as contact of the poppet on an edge prior to flat contact causes heat, erosion, and short life. The internal valve mechanism also is so constructed that the cycling pressure on the high pressure ball poppet sub-assembly during operation is contained within a compressive stress field to reduce the possibility of failure due to fatigue.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a section through the right half of the intensifier assembly illustrating the right hand check valve in place;
FIG. 2 is an enlarged cross section of the inlet/outlet check valve assembly of this invention;
FIG. 3 is a perspective view of the outlet valve ball poppet carrier;
REFERENCES:
patent: 3309013 (1967-03-01), Bauer
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patent: 3526246 (1970-09-01), Leitgeb
patent: 3702624 (1972-11-01), Fries
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patent: 4747758 (1988-05-01), Saurwein
patent: 4818194 (1989-04-01), Saurwein
patent: 4820136 (1989-04-01), Saurwein
patent: 4848671 (1989-07-01), Saurwein
patent: 4862911 (1989-09-01), Yie
patent: 4973026 (1990-11-01), Saurwein
patent: 5037276 (1991-08-01), Tremoulet, Jr.
Forgesharp Limited
McAndrews, Jr. Roland G.
Thorpe Timothy
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