Swagelok SS-4C-EP-5 Poppet Check Valve

The Swagelok SS-4C-EP-5 Stainless Steel Poppet Check Valve is a fixed-pressure backflow-prevention valve for 1/4 in. Swagelok Tube Fittings. It features a 316 stainless steel body with 1/4 in. Swagelok Tube Fitting connections on both ends, a cracking pressure of 5 psi (0.35 bar), and a maximum flow coefficient (CV) of 0.47. It is rated for room-temperature operation up to 3,000 psig at 100°F (206 bar at 37°C) and uses an EP O-ring seal arrangement for Ethylene Propylene elastomer compatibility, with standard cleaning and packaging (SC-10). The EP-5 designation identifies the EP O-ring version of the 4C family, aligning with Swagelok's lineup of fixed-pressure poppet valves for high-purity and general-service lines. Typical uses include protecting instrumentation and preventing backflow in gas and liquid delivery systems in chemical processing and laboratory piping where stable, directional flow is required.