Brief introduction of butterfly valve processing technology

Release time:

2007-06-29

Triple eccentric hard seal butterfly valve is composed of main parts such as valve body, butterfly plate, valve stem and valve seat sealing ring. The sealing design methods of triple eccentric butterfly valves are basically the same, how to ensure the dimensional accuracy of the valve body and the butterfly plate shaft hole, coaxiality and the position of the valve seat and the butterfly plate sealing surface.

Triple eccentric hard seal butterfly valve is composed of main parts such as valve body, butterfly plate, valve stem and valve seat sealing ring. The sealing design methods of triple eccentric butterfly valves are basically the same, how to ensure the dimensional accuracy of the valve body and the butterfly plate shaft hole, coaxiality and the position of the valve seat and the butterfly plate sealing surface. It is the key to realize the complete interchangeability of various parts of the triple eccentric butterfly valve, the quality of the butterfly valve and the service life of the butterfly valve. The usual method is to match the two-axis hole with the valve body and the butterfly plate on the ordinary boring machine, which is not only efficient Low, and the coaxiality is also difficult to guarantee; while the sealing surface is processed after positioning with a slope plate on an ordinary vertical lathe, the disadvantages are intermittent cutting, poor surface quality, difficulty in guaranteeing the roundness, and low efficiency. This is a difficult point that the valve industry has been exploring.

 

According to the quality characteristics of butterfly valves, our company has introduced international advanced CNC valve special machine tools to process butterfly valve equipment and a set of effective and reliable technology, so that the processing accuracy of valves is guaranteed by machine tools. The introduction is as follows:


The valve body
is shown in the figure. After the inlet and outlet flanges, the inner hole and the inner seam are processed first, then the inner seam is positioned (so that the design reference, the process reference, and the assembly reference are coincident). The boring machine (three-axis linkage) automatically and continuously processes the shaft holes at both ends and the end flange shaft holes in one clamping, ensuring the accuracy of the shaft holes and the coaxiality of the two holes. Drill each connecting hole on the CNC vertical valve machining center (three-axis linkage) to complete the machining.
 
Butterfly 
plate The butterfly plate is shown in the figure. First process the plane and the process seam, and then position and press it on the special machine tool for the sealing surface of the CNC butterfly valve. The cone angle γ of the sealing surface is guaranteed by the machine tool. The surface is finished, and the two-axis hole is bored according to the program on the special boring machine for CNC valves. The commonly used sealing surface processing method is to complete the intermittent cutting on the vertical lathe, which not only has low dimensional accuracy and efficiency, but also cannot reverse the R fillets on both sides of the sealing surface.
 
Seat sealing surface 
The sealing surface of the valve seat is processed on a special machine tool for the sealing surface of the CNC butterfly valve. The cone angle γ of the sealing surface is guaranteed by the machine tool, and the three-axis linkage system completes the processing by high-speed milling of the inner sealing surface according to the program.　
 
In order to ensure that the valve 
stem and electric, pneumatic, hydraulic and other driving devices can be assembled to adjust the angle limit arbitrarily, and do a good job in the speedy assembly of other driving devices to achieve the purpose of complete interchange, we will change the valve stem head in a special CNC The involute small modulus splines are milled on the spline milling machine, which overcomes the difficulty of assembling the valves without boring holes in the past butterfly valve processing.
 
Practice has proved that the use of imported valve machines and typical processes can ensure the quality of butterfly valves stably, improve the service life of butterfly valve products, and have high efficiency.

Related news

Brief introduction of butterfly valve processing technology

2007-06-29

Brief introduction of gate valve processing technology

2007-06-29

Share

Back