Outside Screw & Yoke Gate Valve

An outside screw and yoke (OS&Y) gate valve is a heavy-duty, linear-motion isolation valve featuring an externally threaded rising stem supported by an open yoke framework mounted above the valve body. In this specialized arrangement, the stem threads are completely isolated from the process fluid, preventing thread corrosion and erosion from harsh media while facilitating continuous external lubrication. As the handwheel or actuator is turned, the stem and attached wedge gate travel vertically in tandem; the length of the exposed stem provides immediate, unmistakable visual validation of the valve’s open or closed status from a distance. These valves are standard specifications across fire protection sprinkler systems, high-pressure steam distribution headers, oil refinery catalytic loops, and critical industrial pump rooms. Fire protection contractors and refinery engineering teams can secure reliable visual monitoring and eliminate internal stem thread corrosion by importing certified OS&Y gate valves directly from specialized manufacturers in China via our advanced B2B commercial platform.