Stainless steel butterfly valves can be divided into offset plate type, vertical plate type, slant plate type and lever type according to the structure. According to the sealing form, it can be divided into two types: a relatively sealed type and a hard sealed type. The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring. According to the connection type, it can be divided into flange connection and clip type connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

Stainless steel butterfly valve structure:

The structure of the stainless steel butterfly valve spring and the adjustment bolt assembly on the pressure plate. The structure effectively compensates for the tolerance band between the sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve in the two-way interchangeable medium conveying process.

The soft T-shaped multi-layer stainless steel sheet is used to form the sealing ring, which has the double advantages of metal hard seal and soft seal, and has zero leakage sealing performance at both low temperature and high temperature. When the test proves that the positive flow state of the tank (the direction of flow of the medium is the same as the direction of rotation of the disc), the pressure of the sealing surface is caused by the action of the torque of the transmission and the pressure of the medium on the valve plate. When the positive medium pressure increases, the tighter surface of the valve plate and the sealing surface of the valve seat are pressed tighter, and the sealing effect is better.

In the countercurrent state, the seal between the valve plate and the valve seat is biased against the drive to bias the valve plate against the valve seat. As the pressure of the reverse medium increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the deformation of the spring of the adjusting ring stored after the load can compensate the tight pressure of the sealing surface of the valve plate and the valve seat. Plays an automatic compensation function.

Therefore, the utility model does not install a soft and hard multi-layer sealing ring on the valve plate as in the prior art, but is directly mounted on the valve body, and an adjustment ring is added between the pressure plate and the valve seat, which is an ideal two-way hard sealing method. . It will replace the gate valve, globe valve and ball valve. This type of valve should be installed horizontally in the pipeline.

The butterfly valve's disc is mounted in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped disc rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation is 90°, the valve is fully open.

Advantages and disadvantages of stainless steel butterfly valves

1, the advantages of stainless steel butterfly valve

1. It is convenient, quick, labor-saving, and has low fluid resistance. It can be operated frequently.

2. Simple structure, small size and light weight.

3, can transport mud, the least amount of liquid accumulated in the pipe mouth.

4, under low pressure, can achieve a good seal.

5, the adjustment performance is good.

2, the shortcomings of stainless steel butterfly valve

1. The use pressure and working temperature range are small.

2. Poor sealing.

The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be quickly opened and closed by only rotating 90°, and the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body. Therefore, the pressure drop generated by the valve is small, and the filter has better flow control characteristics. The butterfly valve has two sealing types: a spring seal and a metal seal. Elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc. Valves with metal seals generally have a longer life than elastomerically sealed valves, but are difficult to seal completely. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-limited defects. If a butterfly valve is required for flow control, the main choice is the correct size and type of valve. The structural principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants.

Commonly used butterfly valves are clip-on butterfly valves and flanged butterfly valves. The wafer type butterfly valve uses a stud bolt to connect the valve between the two pipe flanges. The flange type butterfly valve has a flange on the valve, and the flanges on both ends of the valve are connected to the pipe flange by bolts. If the valve is in a state of large throttle, the back of the valve plate is prone to cavitation and may damage the valve. Generally, it is used outside of 15°. When the butterfly valve is at the middle opening degree, the shape of the opening formed by the valve body of the oxygen valve and the front end of the butterfly plate is centered on the valve shaft, and the two sides are formed to complete different states, and the front end of the butterfly plate moves in the direction of the water and the water flows on the other side. The direction is moving. Therefore, the one side valve body and the valve plate form a nozzle-like opening, and the other side is similar to the orifice-shaped opening. The nozzle side has a much faster flow rate than the throttle side, and the negative pressure is generated under the throttle side valve. , rubber seals often appear to fall off. Butterfly valve operating torque, the shelf varies depending on the opening degree and the valve opening and closing direction. Horizontal gate valves, especially large-diameter valves, due to water depth, the torque generated by the head and the head of the valve shaft cannot be ignored. In addition, when the valve inlet side device is bent, a bias current is formed and the torque is increased. When the valve is at the intermediate opening, the operating mechanism needs to be self-locking due to the action of the water flow torque.