Method and apparatus to relieve liquid pressure from receiver to condenser when the receiver has filled with liquid due to ambient temperature cycling

A cooling system comprising:

• a condenser:
• a receiver connected to the condenser;
• and
• means for balancing pressure between the receiver and the condenser, the pressure-balancing means maintaining a desired pressure differential between the receiver and the condenser and preventing pressure in the receiver above a maximum pressure level,
• wherein the pressure-balancing means comprises:
• a check valve connected between the condenser and the receiver and allowing refrigerant flow from the condenser to the receiver, and
• a pressure-balancing valve connected between the condenser and the receiver and allowing refrigerant flow from the receiver to the condenser in response to a predetermined pressure differential between the receiver and the condenser;
• and
• wherein the check valve and the pressure-balancing valve share a common housing.

A cooling system comprising:

• a condenser;
• a receiver connected to the condenser with a first line;
• a check valve disposed on the first line and permitting refrigerant flow from the condenser to the receiver;
• a second line having one end connected to the first line between the check valve and the receiver and having another end connected to the first line between the check valve and the condenser;
• and
• a pressure-balancing valve disposed on the second line and permitting refrigerant flow from the receiver to the condenser in response to a pressure differential between the receiver and the condenser.

A cooling system comprising:

• a condenser connected to a discharge gas line;
• a receiver connected to the condenser with a first line;
• a check valve disposed on the first line and permitting refrigerant flow from the condenser to the receiver;
• a second line having one end connected to the first line between the check valve and the receiver and having another end connected to the discharge gas line;
• and
• a pressure-balancing valve disposed on the second line and permitting refrigerant flow from the receiver to the condenser in response to a pressure differential between the receiver and the condenser.

A cooling system comprising:

• a condenser connected to a discharge gas line;
• a receiver connected to the condenser with a first line;
• a check valve disposed on the first line and permitting refrigerant flow from the condenser to the receiver;
• a control valve disposed on the first line between the check valve and the condenser;
• a second line having one end connected to the first line between the check valve and the receiver and having another end connected to the first line between the condenser and the control valve;
• and
• a pressure-balancing valve disposed on the second line and permitting refrigerant flow from the receiver to the condenser in response to a pressure differential between the receiver and the condenser.

A cooling system comprising:

• a condenser connected to a discharge gas line;
• a receiver connected to the condenser with a first line;
• a check valve disposed on the first line and permitting refrigerant flow from the condenser to the receiver;
• a control valve disposed on the first line between the check valve and the condenser;
• a bypass line connecting the discharge line to the control valve;
• a second line having one end connected to the first line between the check valve and the receiver and having another end connected to the bypass line;
• and
• a pressure-balancing valve disposed-on the second line and permitting refrigerant flow from the receiver to the condenser in response to a pressure differential between the receiver and the condenser.

A device for balancing pressure between a condenser and a receiver, comprising:

• a body having a first port connected to the condenser and having a second port connected to the receiver;
• a first check valve disposed in the body and allowing refrigerant flow from the first port to the second port in response to a first pressure differential between the first port and the second port;
• and
• a second check valve disposed in the body and allowing refrigerant flow from the second port to the first port in response to a second pressure differential between the second port and the first port.

A device for balancing pressure between a condenser and a receiver, comprising:

• a body having a first port connected to the condenser and having a second port connected to the receiver;
• a first check valve disposed in the body and allowing refrigerant flow from the first port to the second port in response to a first pressure differential between the first port and the second port;
• and
• a second check valve disposed in the body and allowing refrigerant flow from the second port to the first port in response to a second pressure differential between the second port and the first port,
• wherein the first and second check valves are disposed on a plate in the body between the first port and the second port.