The Widest Selection of Relief Valves

	500 Series 5100 Series 5300 Series 5600 & P-776 Series
For more relief valves, please visit our non-aerospace and U.S. Para Plate sites.

500 Series Relief Valves

	Port Sizes 1/8″ to 1-1/4″ Operating Ranges Vacuum to 200 PSIG Cracking Pressure 0.5 to 150 PSI Configuration Popoff & Inline Connections Male Pipe Female Pipe U.S. & British Male Tube Female Tube Male Tube AN & MS Body Materials Aluminum Brass 316 Stainless Steel Seat Materials Buna N Ethylene Propylene Neoprene Teflon® Viton®
Features Zero Leak Optional Factory Preset Accurate Set Pressure Wide Range of Cracking Pressures Tamper-proof Adjustment Maintenance-free Service 100% Seat Leakage Tested View the Catalog (PDF: 236 KB / 4 pages)

5100 Series Relief Valves

	Port Sizes: 1/8″ to 1-1/4″ Operating Ranges: 0 to 2,400 PSIG Cracking Pressure: 10 to 2,400 PSI Body Materials: Aluminum Brass Steel 303 & 316 Stainless Steel Connections: Male Pipe Female Pipe Male Tube Female Tube Seat Materials: Buna N EPR Neoprene Teflon® Viton®
Features Positive Resealing Accurate Set Pressure Zero Leakage to 95% of Cracking Pressure Wide Range of Cracking Pressures Tamper-proof Adjustment View the Catalog (PDF: 197 KB / 4 pages)

5300 Series Relief Valves

	Port Sizes 1/4″ to 1/2″ Operating Ranges 400 to 10,500 PSIG Burst Pressures Brass: over 30,000 PSIG S.S.: over 40,000 PSIG Connections Female Pipe Female Tube Male British Parallel Pipe Female British Parallel Pipe Aminco, Union NASA MC240 Body Materials Brass 303 & 316 Stainless Steel Seat Materials Buna N Neoprene Viton®
Features Zero Leakage Dead-tight Seal Well Above 95% of Cracking Pressure Positive Reseal No Pressure Rise with Increasing Flow View the Catalog (PDF: 232 KB / 5 pages)

5600 & P-776 Series Relief Valves

	Port Sizes 1/8″ to 1-1/4″ Cracking Pressures 450 to 4,300 PSIG Operating Ranges 450 to 4,500 PSIG Body Materials 2024-T4/T351 Aluminum 303 Stainless Steel Connections Inline, MS33649 Cartridge Type Right Angle, MS16142 (SAE) Right Angle Flanged, MS3914 Seat Materials Buna N Ethylene Propylene Viton®
Features High Flow Capacity Ultra Fast Response Stable Cracking Pressure View the Catalog (PDF: 446 KB / 4 pages)

* Teflon® is a registered trademark of DuPont and Viton® is registered trademark of DuPont Dow Elastomers.

See Circle Seal Controls' Product Catalog for our full line of relief valves.