Parker's MAR Series Relief Valves offer two distinct designs for systems up to 15,000 PSI (1034 bar). One is a hard seat relief valve and the other is a soft seat relief valve. Parker’s MARA Series (Hard Seat) relief valves provide reliable venting of gases or liquids for set pressures from 3,000 psi (206.8 bar) minimum to 15,000 psi (1034 bar). The standard temperature range for all models is -423ºF to 400ºF (-252ºC to 204ºC). A high temperature option to 750ºF (400ºC) is also available. These precision valves are designed for pressure gas systems, cryogenic systems, petrochemical applications and other special systems.

These precision valves are designed for pressure gas systems, where zero leakage is critical. They are not recommended for liquid nitrogen or liquid carbon dioxide, which produce gas at cryogenic temperatures upon relief. Relief valves are designed to open proportionally to increasing pressure. Therefore, they are not recommended for applications requiring immediate full valve flow at set pressure (such as decompositions, polymerizations, etc.). Full flow of relief valve is defined at 10% over set pressure.

Parker’s MARSA Series (Soft Seat) relief valves utilize a soft seat design for reliable venting of gases at set pressures from 1,500 psi (103 bar) to 15,000 psi (1034 bar). The operating temperature range is 32ºF (0ºC) to 400ºF (204ºF). The soft seat design provides bubble tight sealing, repeatable pop-off, and reseat. Additionally, soft seat valves provide a higher cycle life than metal seat relief valves. These precision valves are designed for pressure gas systems, where zero leakage is critical. They are not recommended for liquid nitrogen or liquid carbon dioxide, which produce gas at cryogenic temperatures upon relief. Relief valves are designed to open proportionally to increasing pressure. Therefore, they are not recommended for applications requiring immediate full valve flow at set pressure (such as decompositions, polymerizations, etc.). Full flow of relief valve is defined at 10% over set pressure.


Markets:

• Chemical Processing
• Petrochemical
• Research
• Power


Features/Benefits:
• Hard and Soft Seat designs
• NPT High Pressure End Connections
• Heat code traceability
• High Cycle Life
• Large Filter Areas

Applications:

• Process Control Lines
• Pressure Gas Systems
• High Pressure Equipment Protection
• Cryogenic Systems