From the three eccentric metal hard seal butterfly valve structure characteristics analysis. Butterfly plate assembly sealing ring for stainless steel plate and asbestos plate assembly. Valve body sealing ring for hard alloy, high hardness, feed amount is difficult to control, not easy a processing molding. And processing surface roughness requirements are high. In order to ensure the processing requirements, the process for the valve body or butterfly plate assembly roughing – valve body sealing ring surfacing carbide – heat preservation for 12h – heat treatment to eliminate thermal stress – on the tooling rough sealing surface – on the tooling fine sealing surface – on the grinding head grinding sealing surface – valve body and butterfly plate assembly boring shaft hole – strength test – sealing test.
Tooling for machining:
The sealing surface (processing surface) of the disc assembly sealing ring and the valve body sealing ring is inclined conical surface. The Angle between the center line of the cone of the valve body sealing ring and the vertical line of the space is 8°, and the Angle between the center line of the cone of the sealing ring of the butterfly plate assembly and the vertical line of the space is 8°. Therefore, the processing tooling of the valve body sealing ring and the sealing ring of the butterfly plate assembly is designed.
Valve body sealing ring processing:
The valve body is sealed as a sealing ring, welded in the valve body. The welded valve body is clamped on the valve body sealing ring processing tooling on the 2.5m vertical vehicle. And the vertical turning tool rod is rotated 8°. According to the design requirements of the drawing, the tool is moved along the direction of the conical bus after alignment. And the vehicle is reached to the size before the welding stainless steel. Then surfacing the stainless steel, finally the welded stainless steel body on the upright car. According to the above method of the car body sealing ring to the size required in the drawing. Finally, a grinding head is installed on the tool holder of the vertical vehicle. And the sealing ring of the valve body is grinded to make it meet the roughness requirements of the drawing design.
Butterfly plate assembly sealing ring processing
Spindle hole machining of valve stem:
Put the butterfly plate assembly into the valve body, adjust the relative position of the butterfly plate assembly and the valve body. Pour saponification liquid, no leakage within 5 minutes. Press the butterfly plate assembly, boring the valve body and the butterfly plate axle hole.
Using this process method to process the valve body sealing ring and the butterfly plate assembly sealing ring. It easy to operate, high efficiency. It can well ensure the geometric accuracy of the sealing surface. The strength test and seal test have reached the design requirements. Has good practical value and promotion value.