1 Velan Y-type valve cover valve non-stop inspection process 1.1 Equipment Overview and Parameters 1.2Velan Y-type valve cover valve without cover Overview 1/4 inch? 4 inch (8-100 mm) Velan Y-valve cover valve, valve Body as a whole casting, this design structure for high-pressure state work. Valves with directional valve disc, the material is stellite 6. Stellite is an alloy containing three metals of tungsten, chromium and cobalt. Its average Brinell hardness is 400. In the valve industry, it is often used as an ideal hard-surfaced material. However, the valve plate and seat are not indestructible. For example, if hard impurities are trapped between the valve disc and the valve seat, the valve may be damaged when the valve disc is pressed into the valve seat. Velan Y Unclamping Globe Valves 1/4 "? 4" (8-100 mm) For use in the top pressure piping vent system of the SG-2026 / 17.5-M905 boiler in Taipower. 1.3 Velan Y-type valve cover valve parameters 1.4 Recommended graphite packing gland nut torque torque size