HP500 Series Relief Valves
Relief Valves
Choose from a wide range of high quality relief valves. Operating pressures range from vacuum to 10,500 psig. Body materials typically include 303 & 316 stainless steel and brass. Operating temperatures range from −320° to +550° F (−196° to +288° C).
HP500 Series Relief Valves Features
- Very accurate cracking pressure
- Zero leakage up to 95% of cracking pressure
- 100% seat leakage tested
- Tamper-proof adjustment
- PED certifications and CE marking available for most models
Please consult your Circle Seal Controls distributor or our factory for information on special connections, operating pressures and temperature ranges.
Body Materials
- Brass
- 316 stainless steel
Connection Sizes
- 1/4″ to 1/2″
Cracking Pressure
- 150 to 575 PSI
Connections
- Male Pipe
- Female Pipe
Seat Materials
- Buna N
- Ethylene Propylene
- Neoprene
- Silicone
- Viton®
Configuration
-
Popoff & Inline
| Series | Body Materials | O-Rings | Operating Pressure | Temperature Range | Connections |
|---|---|---|---|---|---|
| 500 | Aluminum Brass 303 stainless 316 stainless |
Buna N ethylene propylene silicone neoprene Telfon® Viton® |
Vacuum to 200 psig | −320°F to +400°F −196°C to +204°C |
1/8″ to 1-1/4″ |
| L500 | Brass 316 stainless |
Buna N ethylene propylene silicone neoprene Telfon® Viton® |
0 to 25 psig (1.71 Bar) |
−70°F to +550°F −57°C to +288°C |
1/4″ to 1/2″ |
| HP500 | Brass 316 stainless |
Buna N ethylene propylene silicone neoprene Viton® |
150 to 575 psig 10 to 40 bar Depending on pipe size |
−65°F to +350°F −54°C to +177°C |
1/4″ to 1/2″ male and female pipe |
| 5100 | Brass Carbon Steel 303 stainless 316 stainless |
Buna N ethylene propylene neoprene Telfon® Viton® |
0 to 2400 psig 166 bar |
−320°F to +400°F −196°C to +204°C |
1/8″ to 1-1/4″ |
| D500/M5100 | Naval brass 303 stainless 316 stainless |
Buna N ethylene propylene neoprene Telfon® Viton® EPDM M5100 only: silicone |
−100°F to +400°F −73°C to +204°C |
D500: 1/4" male pipe M5100: 1/8″ to 1″ male pipe |
|
| 5300 | Brass 303 stainless 316 stainless |
Buna N neoprene Viton® |
400 to 10,500 psig (28 to 724 bar) |
−65°F to +350°F −54°C to +177°C |
1/4″ to 1/2″ female pipe 1/4″ to 1″ female tube |
| R6000 | 316 stainless | Buna N EPR neoprene Kalrez® Viton® silicone |
5-6000 psig 0-414 barg |
−70°F to +550°F −57°C to +288°C |
1/4″ |