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. V33Pressures up to 3,000 psig (206 bar) and 6,000 psig (413 bar) Catalog Spec. Working Pressure : 3,000 psig Cracking Pressure : 1/3 to 100 psig Stainless Steel and Brass DK-Lok 1/8 to 1 in. OD Pipe thread 1/8 to 1 in. Brief Description Designed to prevent loss of media caused by failed connections and for uni-directional flow control of fluids in chemical processing, power generation, oil and gas industry.