The Circle Seal Controls 500 Series Relief Valves product leaflet details operation, specifications, applications, and ordering information.
The 500 Series Adjustable Popoff & Inline Relief Valves provide over‑pressure protection for a wide range of systems. They use a resilient seal design that prevents leakage and a metal‑to‑metal poppet that opens when system pressure exceeds the set cracking pressure, allowing controlled flow.
These valves are suitable for storage tanks, refrigeration, medical equipment, pumps, and many other applications. The leaflet includes technical data, flow curves, material options, connection sizes, and ordering instructions, along with safety and certification information.
| Operating Pressure | Vacuum to 200 psig (14 bar) |
|---|---|
| Cracking Pressure Range | 0.5 to 150 psig (10 bar) |
| Temperature Range | −320° F to +400° F (−196 °C to +204 °C) |
| Connection Sizes | 1⁄8 inch to 1¼ inch |
| Body Construction Materials | Aluminum, brass, 303 or 316 stainless steel |
| O‑ring Materials | Buna N, ethylene propylene, neoprene, silicone, PTFE, or Viton® |
| Spring Materials | 302 stainless steel or 17‑7 PH stainless steel |
The cracking pressure can be set between 0.5 and 150 psig (10 bar).
PED certifications and CE marking are available for most models.