Improvement of sanitary grade butterfly valve
Improve the sanitary butterfly valve ① Rubber ring set point outside the production, to strengthen the quality control, usually for the water supply industry valves, the choice of EPDM rubber and NBR rubber and natural rubber used is not mixed with recycled rubber; % Hubei a factory on the butterfly plate seal plate into a short piece of the entire plate dovetail assembly connection, home self-priming pump to regulate the degree of squeezing the pressure plate parts to balance the life of the butterfly valve, but this regulation skills Is also difficult to grasp; ② Tianjin and Shanghai individual plant launched DB sanitary butterfly valve and flange sanitary butterfly valve, their seal ring embedded in the dovetail groove, there is a certain margin of activity, you can adjust the sanitary butterfly valve closed When the rubber ring extrusion situation; ③I introduced a "fluorine plastic" ring instead of a rubber ring, a small vacuum pump to improve the wear resistance and aging resistance of the ring; ④Many manufacturers to introduce sanitary metal butterfly valve replacement Rubber ring sealing sanitary butterfly valve. Metal sealing sanitary butterfly valve seal due to the smaller elasticity, the general use of eccentric structure, especially with three-dimensional eccentric structure is ideal. Metal sealing sanitary butterfly valve originally used for high pressure steam pipe, the price is more expensive, it is not easy to damage the sealing surface in operation, but its manufacturing precision demanding, once the leakage is difficult to repair. 1) low temperature control valve housing structure and shape. The correct choice of materials or the normal operation of the regulating valve is extremely important. Compared with the stop valve and gate valve, the structural characteristics of the sanitary butterfly valve not only avoids the deformation caused by the irregular shape and the uneven thickness of the shell wall at the low temperature, but also due to the deformation of the sanitary butterfly valve Small, the basic shape of the valve is about the so-called, so the heat capacity is small; to the cold consumption is also small; shape rules and easy to control valve cooling measures. 2) Selection of Stem Bushing: According to the user's feedback, some of the low temperature control valves are in operation. The sticking occurs in the rotating parts of the control valve. The occurence phenomenon occurs occasionally because of the unreasonable choice of matching material, Too small, and processing accuracy and other reasons. In the development of cryogenic control valve, has taken a series of measures to prevent the above phenomenon. For example, we choose the SF-1 composite bearing with small friction coefficient and self-lubricating performance for the upper and lower stems of the valve stem, which can be applied to some special needs of the low-temperature control valve. As a result, our sanitary grade butterfly valve has been greatly improved and improved.
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