US3905608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure seal
Assignee: Flow Systems Inc
•
Filing: 1973-12-26
•
Granted: 1975-09-16
•
Expires: 1993-12-26
Abstract
Abstract A high pressure seal assembly having a forward high pressure side and a rear low pressure side, and arranged to seal the interface between a housing and a piston. There is a rearmost metal backup ring, next a relatively high yield strength seal ring, a lower yield strength seal ring just forward of the high yield strength ring, and a forward retaining ring. At the forward outer circumferential edge of the low yield strength seal ring, there is an annular groove in which is mounted a compressible Oring that presses the forward portion of the low yield strength ring against the reciprocating piston, and an outer metal antiextrusion ring surrounds the high yield strength ring. The rear backup ring is fixedly mounted between two housing sections in a manner that in initial installation the position of the backup ring can be adjusted laterally to accomodate for any misalignment between the piston and housing and yet have a close fit with respect to the piston.
Inventors
- 👤 John H Olsen
- 👤 Benjamin A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:47
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/166; F16J15/18; F16J15/187; F16J15/56; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10S277/935; Y10S277/939; Y10S277/94; Y10S277/944
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
271 words
A high pressure seal assembly to seal an interface between two relatively moving members, such as in a high pressure piston and housing assembly, said first member having a first sliding seal surface to engage said seal assembly and movable relative to said seal assembly, said second member having a second stationary seal surface to engage said assembly and being stationary with respect to said seal assembly, said seal assembly having a forward high pressure side and a rear low pressure side, said seal assembly comprising: a. a first rear substantially rigid backup ring means fixedly mounted to said second member, b. a second relatively high yield strength seal ring means positioned between said first and second surfaces and forward of said backup ring means, said second ring means fitting closely against said first surface, c. a third relatively low yield strength seal ring means positioned between said first and second surfaces and forward of said second ring means, said third ring means having a first sliding seal surface in constant sealing engagement with said first surface of the first member, and a second stationary seal surface engaging said second surface of the second member, d. said third ring means having an annular recess formed in said third ring means, and e. a fourth compressible ring means compressibly mounted in said annular recess, so that said fourth ring means is pressing at least a portion of said third ring means laterally into constant engagement with the first surface of the first member, so as to create a seal therewith during a condition of lower pressure at said seal high pressure side.
Claim 2
Dependent Claim
271 words
A high pressure seal assembly to seal an interface between two relatively moving members, such as in a high pressure piston and housing assembly, said first member having a first sliding seal surface to engage said seal assembly and movable relative to said seal assembly, said second member having a second stationary seal surface to engage said assembly and being stationary with respect to said seal assembly, said seal assembly having a forward high pressure side and a rear low pressure side, said seal assembly comprising: a. a first rear substantially rigid backup ring means fixedly mounted to said second member, b. a second relatively high yield strength seal ring means positioned between said first and second surfaces and forward of said backup ring means, said second ring means fitting closely against said first surface, c. a third relatively low yield strength seal ring means positioned between said first and second surfaces and forward of said second ring means, said third ring means having a first sliding seal surface in constant sealing engagement with said first surface of the first member, and a second stationary seal surface engaging said second surface of the second member, d. said third ring means having an annular recess formed in said third ring means, and e. a fourth compressible ring means compressibly mounted in said annular recess, so that said fourth ring means is pressing at least a portion of said third ring means laterally into constant engagement with the first surface of the first member, so as to create a seal therewith during a condition of lower pressure at said seal high pressure side.
Claim 3
Dependent Claim
53 words
The seal assembly as recited in claim 1, wherein said backup ring means is laterally adjustable with respect to said second member, whereby misalignment of components can be compensated for by lateral adjustment of said first backup ring means, while maintaining a close tolerance between said backup ring means and said first member.
Claim 4
Dependent Claim
70 words
The seal assembly as recited in claim 2, wherein said second member comprises first and second portions adapted to interengage with one another to provide an annular recess to receive said backup ring means, said first and second portions having a preassembly position permitting lateral adjustment of said backup ring means and a final assembled position where said backup ring means is fixedly retained in position in the seal assembly.
Claim 5
Dependent Claim
48 words
The seal assembly as recited in claim 2, further comprising an anti-extrusion ring of a substantially rigid material positioned radially outwardly of said second ring means and functioning to contain said second ring means from extruding into an area between said backup ring means and said second member.
Claim 6
Dependent Claim
33 words
The seal assembly as recited in claim 1, further comprising a forward retaining member to engage the forward end of said seal assembly so as to hold the components thereof properly in place.
Claim 7
Dependent Claim
45 words
The seaL assembly as recited in claim 1, wherein said annular recess is formed in a forward portion of said third ring means, with said compression ring means thus forcing the forward portion of said third ring means into sealing engagement with the first member.
Claim 8
Dependent Claim
41 words
The seal assembly as recited in claim 6, wherein said annular recess is further positioned adjacent said second member, whereby said compression ring means presses from said second member inwardly against a forward radially inward portion of said third ring means.
Claim 9
Dependent Claim
214 words
The seal assembly as recited in claim 1, wherein: a. said second member comprises first and second portions adapted to interengage with one another to provide an annular recess to receive said backup ring means, said first and second portions having a preassembly position permitting lateral adjustment of said backup ring means and a final assembled position where said backup ring means is fixedly retained in position in the seal assembly, whereby misalignment of components can be compensated for by lateral adjustment of said first backup ring, while maintaining a close tolerance between said backup ring means and said first member, b. said assembly further comprising an anti-extrusion ring of a substantially rigid material positioned radially outwardly of said second ring means and functioning to contain said second ring means from extruding into an area between said backup ring means and said second member, c. said apparatus further comprising a forward retaining member to engage the forward end of said seal assembly so as to hold the components thereof properly in place, and d. said annular recess being formed in a forward radially outward edge portion of said third seal ring means, whereby said compression ring means presses from said second member inwardly against a forward radially inward portion of said third ring means.
References Cited (Backward Citations)
US2973978A
Cited
US3172670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |