By-pass valve for automotive air conditioning system
AssigneeThe Singer Company
InventorHenry Jacyno
Life of this patent
Estimating the term…
Abstract
The valve opens in response to a predetermined small pressure differential acting across the valve. As the pressure differential increases, the valve throttles the flow and when a high pressure differential exists the valve closes. The valve is designed to be placed in a by-pass circuit in an automotive air conditioning system to provide adequate flow under low cooling loads to cool and lubricate the compressor. Under normal and high evaporator loads, the by-pass flow is throttled or closed off completely to avoid needless consumption of energy.
Claims9
In an automotive air conditioning system of the type having a thermostatic expansion valve regulating flow from a compressor to an evaporator connected to the compressor inlet and having a by-pass from the valve inlet to the compressor inlet, the by-pass being controlled by a check valve which opens in response to a predetermined pressure differential between the by-pass inlet and outlet, the improvement comprising a shut-off valve in the by-pass operative to substantially close the by-pass in response to a predetermined high pressure differential between the by-pass inlet and outlet.
A valve comprising,
- a valve body having an inlet and an outlet,
- a valve port between the inlet and the outlet and having a valve seat on both the upstream and downstream sides of the port,
- first valve means in said body on the downstream side of the port,
- second valve means in said body on the upstream side of the port,
- a common member interconnecting the first and second valve means,
- a spring biasing both valve means whereby the first valve means is biased to close on the valve seat on the downstream side of the port and is responsive to the pressure differential between the inlet and the outlet to open at a predetermined low differential,
- a predetermined high pressure differential being operative to close the second valve means on the valve seat on the upstream side of the port.
A valve comprising,
- a valve body having an inlet and an outlet and a valve port therebetween,
- a check valve on the downstream side of the port,
- a shut-off valve on the upstream side of the port,
- a tapered spool-like throttling valve passing through the port and interconnecting the check valve and the shut-off valve to form a valve assembly,
- a spring biasing the valve assembly to seat the check valve on the port,
- said valve assembly moving against the bias of the spring to open the check valve in response to a predetermined low pressure differential between the inlet and the outlet and to thereafter move the throttling valve relative to the port to decrease the flow area as the pressure differential increases until a predetermined maximum pressure differential is reached at which time the shut-off valve seats on the port.
Dependencies are inferred from the claim text.