Depending on the Industrial Valves damage, replace the valve door door rod threaded sleeve, grinding to repair to the seat and clapper sealing surfaces, found that the upper sealing surface contact, after repeated loading on boiler side 1. 2 mm gap, turbine side also has a 0. 6 mm gap, that is to say, valve seat and valve plate taper has serious, affected the rigor of the valve, Industrial Valves leakage. In order to solve the defects, only consider the scene to repair of the valve, due to the main steam electric main valve is single wedge gate valve plate, so we have to solve the problem only disc replacement into the same as the seat of the taper. For replacement, it is necessary to accurately measure the taper. How to measure the taper? By measuring due to deep within the valve, the hand of the hard to reach the seat at the bottom, so that it cannot accurately measure the top and bottom of the seat, and the distance of measuring points and won't be able to accurately measure the taper of the seat, after meditation out to repair the valve work made the construction plan. Step 1: in order to solve the problem of measuring the taper seat and disc, first create two slightly bigger than the ram model of the disc, and then hanging on the seat contact area, use among four small iron bar open gate model make it fully contact with the seat, with electric welding four small iron bar with two pieces of model homogeneous welding firmly, to stay out after cooling, taper of the ram model is measured with a protractor. Step 2: the disc according to the valve plate model of taper cutting, will be turning good replacement within the disc into the seat when the replacement can adopt the method of red lead contact; When the taper at the same time, the basic phase in the disc concave inside a car the same taper surface, used as the sealing face turning the datum after welding. Step 3: to surfacing Industrial Valves sealing surface. Surfacing welding electrode can undertake choosing according to valve used in the temperature, the valve used for surfacing welding electrode half a ferrite of two kinds of high quality silicon chromium and nickel molybdenum, mainly used for high pressure working temperature below 600 ℃ valve sealing surface surfacing welding; Or use cobalt-based hard sealing surfacing electrode: D802, D812. The subsection welding in the welding process, to prevent welding deformation of high temperature causes the disc. When surfacing welding work and working conditions is very complex, must choose appropriate electrode according to the different requirement. Different artifacts and surfacing electrode to adopt different welding technology, to obtain satisfactory result of surfacing welding.
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flanged gate valve is one of the best products sold in the market today.
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