Stainless steel butterfly valve can be divided into the form of the structure of offset plate, vertical plate, inclined plate and lever. Can be divided into the form of the sealed type seal and hard seal type two kinds. Soft seal type generally use rubber ring seal, metal hard seal type usually adopt ring seal. According to the connection type can be divided into flange and clamp connection; According to the methods can be divided into manual transmission, gear transmission, pneumatic, hydraulic and electric. Stainless steel butterfly valve structure: stainless steel butterfly valve spring and clamp on adjusting bolt assembly structure. This structure can effectively compensate the tolerance zone between sleeve and body and the elastic deformation of the stem under medium pressure, solve the valves in the process of the two-way exchange medium conveying the sealing problems. Soft T on both sides of the multi-layer stainless steel pieces of sealing ring, with metal sealing and soft sealing the dual advantages of under low temperature and high temperature circumstances, all with zero leakage sealing performance. Trials show that pool is flow state ( Medium flow direction is same as the rotation direction of the butterfly plate) When the sealing surface pressure is the drive torque and medium pressure in the valve plate. Positive medium pressure valve plate oblique cone surface and Industrial Valves seat sealing surface squeezed more tightly, sealing effect is better. When the current state, between the valve plate and valve seat sealing pressure on drive torque make the valve plate to the seat. As the reverse medium pressure increases, the unit is pressure between the valve plate and valve seat is less than the pressure of medium, the adjusting ring after the loading of the spring deformation energy stored by compensating valve plate and valve seat sealing surface of the tight pressure automatic compensation effect. So the utility model is not like the existing technology, soft hard multi-layer sealing ring, installed in the valve plate directly installed on the valve body, in the middle of the plate and seat add adjustable ring is the ideal way of two-way hard seal. It will replace gate valve, globe valve and ball valve in this kind of valve shall generally be installed in the pipeline. The butterfly valve butterfly plate installed on the diameter of the pipe direction. Cylindrical channels in butterfly valve body, disc disc around the axis of rotation, rotation Angle for 0 ° - Between 90 °, rotate to 90 °, the Industrial Valves is fully open. The advantages and disadvantages of stainless steel butterfly valves, stainless steel butterfly valve 1 1, convenient for opening and closing the advantages of quick, save Labour, fluid resistance small, can often operate. 2, simple structure, small volume, light weight. 3, can transport the mud, the apertures least accumulated liquid. 4, low pressure, can achieve good sealing. 5, good regulation performance. 2, the shortcomings of stainless steel butterfly valves 1, working pressure and working temperature range is small. 2, poor sealing. Butterfly valve has simple structure, small volume, light weight, only by a few parts. And only need to rotate 90 ° can rapid opening and closing, simple operation, at the same time, the valve has good flow control characteristics. Butterfly valve in the fully open position, the butterfly plate thickness is medium flows through the body when the only resistance, surrogate thus produced by the valve pressure drop is small, the filter has good flow control characteristics. Butterfly valves have a seal and metal seal two kinds of seal type. Elastic sealing valve, sealing ring can be embedded in the body or attached to the butterfly plate peripheral. Using metal seal valve generally live longer than elastic sealing valve, but it is hard to be completely sealed. Metal sealing can adapt high working temperature, elastic seal has the defect of being limited by the temperature. If required butterfly valve used as flow control, mainly is the right choice of the size and type of valve. The structure and principles of butterfly valve is especially suitable for production of large diameter valves. Butterfly valve not only in the oil, gas, chemical industry, water treatment and other general industrial used widely, but also applied to the cooling water system of thermal power plants. Commonly used butterfly valve, which has two kinds of the wafer butterfly valve and flanged butterfly valve. Wafer butterfly valve with stud connection in place between two pipe flanges and flanged butterfly valve is a valve with flange, bolts on the valve flange connection on the pipe flange on both ends. If the valve is in a state throttling range is larger, the back of the valve plate easy cavitation occurs, the possibility of damage to the valve, used in general more than 15 °. Butterfly valve in the opening, the oxygen valve body and disc front of mouth shape to valve shaft as the center, on both sides of the form a complete different state, the butterfly plate on one side of the front end of downstream water direction, the other side of the upstream water direction, therefore, on one side of the valve body and valve plate form like opening nozzle shape, on the other side is similar to throttle aperture openings, nozzle side of more quickly than the throttling lateral velocity, and the side of the throttle valve will produce negative pressure, under the rubber seals often can appear fall off. Butterfly valve, operating torque shelves for the opening and the direction of the valve opening and closing its different values, different horizontal gate, especially large diameter valve, due to water depth, Industrial Valves shaft, the water head difference generated by the torque also nots allow to ignore. In addition, the valve inlet side bend, form the bias current, torque will be increased. Due to water flow of the opening of the valve is in the middle moment, operators need to be self-locked.
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