Check & Relief ValvesA valve is a device that regulates, directs or controls the flow of a fluid by opening, closing, or partially obstructing various passageways. Valves are technically valves fittings, but are usually discussed as a separate category. VX36Pressures up to 6,000 psig (413 bar) Catalog Spec. Working Pressure : 6,000 psig Up to 204℃ (400℉) Designed to stop uncontrolled release of system media DK-Lok 1/4 to 1/2 in. OD Pipe thread 1/8 to 1/2 in. Brief Description Designed to stop uncontrolled realease of system fluid on downstream line rupture. Stainless steel construction DK-Lok and Pipe End connections up to 1/2 in.