L500 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).
L500 Series Relief Valves Features
- Accurate cracking pressure
- Eliminates sticking
- In-line or vent to atmosphere with deflector cap
- Adjustable cracking pressure
- Zero leakage
- Optional factory preset
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
O-ring Materials
- Buna N
- Ethylene Propylene
- Kalrez®
- Neoprene
- Silicone
- Viton®
Spring Materials
- 302 Stainless Steel
Cracking Pressure
-
0.2 psig to 15 psig
Operating Pressure
- 0 to 25 psig (1.72 BAR)
Inline Valve Proof Pressure
- 37.5 psig (2.59 BAR)
Inline Valve Burst Pressure
- Above 100 psig (6.89 BAR)
Temperature Range
- −70° F to +550° F (−57° C to +288° C) Based on O-ring material
Connection Sizes
- 1/4″–1/2″
Orifice Size
- 0.281″
| 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″ |