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Cryogenic proportional Relief valve - CPRV boil-off valve

Parker Cryogenic Proportional Relief Valves are designed to protect hydrogen and LNG storage tanks from overpressure, gradually reducing pressure and effectively managing boil-off gas. When the upstream pressure exceeds the closing force exerted by the valve’s spring, the lower stem opens, permitting flow through the valve’s outlet port, where it can be recaptured or released to the atmosphere. The flow rate increases proportionately to the upstream pressure increase.

Each relief valve is characterized by a set pressure, which marks the point at which the valve begins to open to discharge excess pressure in the tank. The Parker Cryogenic Proportional Relief Valve is designed with an accuracy of ±3%, meaning it starts to open within ±3% of the set pressure limits.

Upon the release of excess pressure, the valve returns to its closed position (reseats), preventing the wastage of expensive cryogenic gases. The valve will close at a pressure between 98% and no lower than 85% of the set pressure - depending on the application.

The balanced bellows design of the proportional relief valve is a crucial feature that ensures consistent valve operation regardless of back pressure changes. This design employs a unique mechanism to balance the forces within the valve, maintaining a consistent output even under fluctuating pressure conditions.

A low-friction stem seal design reduces friction, enhancing the accuracy of cracking pressure and reseat pressure.

Each valve is individually factory-set to the required set pressure, clearly marked on the body, tested, and stamped with the date of manufacture and a unique serial number before dispatch. All valves are supplied protected with a tamper-proof seal.

Parker Cryogenic Proportional Relief Valves are available with fullyintegrated A-LOK® or CPITM inlet and outlet connections for leak-free operation. The valve must be installed vertically to ensure optimal performance.

Cryogenic proportional Relief valve - CPRV boil-off valve

Cryogenic proportional Relief valve - CPRV boil-off valve

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