US3894561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-way reversing valve with differential area operator
Assignee: Eaton Corp
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Filing: 1974-03-14
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Granted: 1975-07-15
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Expires: 1994-03-14
Abstract
Abstract The four-way reversing valve is utilized in refrigerating systems for heat pump applications to interchange the heating and cooling effects of the evaporator and condenser. The three-way pilot valve controls application of high or low system pressure to the end of the chamber adjacent the large piston. The different areas of the two pistons result in movement of the slide valve to the left (both modifications) when high pressure is applied and to the right when low pressure is applied.
Inventors
- 👤 James M Thornbery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:09
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/0655; F16K31/00; F16K31/12; F16K31/36; F16K31/363; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726; Y10T137/86839
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
A reversing valve comprising, a body including a valve chamber, a high pressure inlet to the chamber, a low pressure outlet from the chamber, and a pair of ports adjacent the outlet, a slide valve in the chamber movable between two positions in which it serves to connect either of said ports to said outlet while the other port communicates with the chamber, said body including a large diameter cylinder and a small diameter cylinder, a piston in each cylinder, the pistons being interconnected and being connected to the slide valve, means supplying a constant pressure to the space between the pistons, one side of the smaller piston being exposed to the chamber pressure and the other side of the smaller piston being exposed to low pressure so there is always a pressure differential acting across the smaller piston, means supplying high or low pressure to the space between the larger piston and the head of the larger cylinder to cause the pistons and slide valve to move between said positions by reason of the pressure differential acting across the small piston area in one position and by reason of the pressure differential across the difference in piston areas in the other position.
Claim 2
Dependent Claim
203 words
A reversing valve comprising, a body including a valve chamber, a high pressure inlet to the chamber, a low pressure outlet from the chamber, and a pair of ports adjacent the outlet, a slide valve in the chamber movable between two positions in which it serves to connect either of said ports to said outlet while the other port communicates with the chamber, said body including a large diameter cylinder and a small diameter cylinder, a piston in each cylinder, the pistons being interconnected and being connected to the slide valve, means supplying a constant pressure to the space between the pistons, one side of the smaller piston being exposed to the chamber pressure and the other side of the smaller piston being exposed to low pressure so there is always a pressure differential acting across the smaller piston, means supplying high or low pressure to the space between the larger piston and the head of the larger cylinder to cause the pistons and slide valve to move between said positions by reason of the pressure differential acting across the small piston area in one position and by reason of the pressure differential across the difference in piston areas in the other position.
Claim 3
Dependent Claim
15 words
A valve according to claim 1 in which the valve chamber is between the pistons.
Claim 4
Dependent Claim
29 words
A valve according to claim 1 in which both pistons are located at one end of the valve chamber and the space between the pistons is at low pressure.
Claim 5
Dependent Claim
234 words
The combination with a refrigeration system of the heat pump type in which the compressor delivers hot high pressure refrigerant to a reversing valve which directs flow to one of two coils to be condensed therein and then metered into the other of the coils from which the refrigerant flows through the reversing valve at low pressure for return to the compressor, of an improved reversing valve, comprising, a body including a valve chamber, an inlet to the chamber connected to the compressor outlet whereby high system pressure obtains in the chamber, an outlet from the chamber connected to the compressor suction line, a pair of ports in the chamber, each being connected to one of the coils, a slide valve in the chamber movable between two positions in which either of the two ports communicates with said outlet while the other port communicates with the chamber to direct high pressure flow to the associated coil, said body including two cylinders of unequal size, a piston in each cylinder, the pistons being interconnected and connected to the slide valve, the space between the pistons being at a system pressure, one side of the smaller piston being exposed to high system pressure in the valve chamber, and means for connecting the space between the larger piston and its associated cylinder head to either high or low system pressure to actuate the pistons and slide valve.
Claim 6
Dependent Claim
234 words
The combination with a refrigeration system of the heat pump type in which the compressor delivers hot high pressure refrigerant to a reversing valve which directs flow to one of two coils to be condensed therein and then metered into the other of the coils from which the refrigerant flows through the reversing valve at low pressure for return to the compressor, of an improved reversing valve, comprising, a body including a valve chamber, an inlet to the chamber connected to the compressor outlet whereby high system pressure obtains in the chamber, an outlet from the chamber connected to the compressor suction line, a pair of ports in the chamber, each being connected to one of the coils, a slide valve in the chamber movable between two positions in which either of the two ports communicates with said outlet while the other port communicates with the chamber to direct high pressure flow to the associated coil, said body including two cylinders of unequal size, a piston in each cylinder, the pistons being interconnected and connected to the slide valve, the space between the pistons being at a system pressure, one side of the smaller piston being exposed to high system pressure in the valve chamber, and means for connecting the space between the larger piston and its associated cylinder head to either high or low system pressure to actuate the pistons and slide valve.
References Cited (Backward Citations)
US2920653A
Cited
US3448959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |