The multi-level hard sealing butterfly valve has a simple, compact, light weight, easy installation and disassembly, and convenient maintenance; the multi-level hard sealing butterfly valve has a simple structure, compact structure, light weight, easy installation and disassembly, and convenient maintenance. The stainless steel "U"-shaped sealing ring has a certain elasticity, and it has excellent sealing performance with the butterfly plate at high temperature and low temperature. The three-dimensional eccentricity of the multi-layer hard sealing butterfly valve has been strictly calculated, and the "U"-shaped sealing ring and the butterfly plate have almost no friction, long service life, and the function of tightening the tighter. The sealing surface of the butterfly plate is made of surfacing cobalt-based hard alloy, and the sealing surface is wear-resistant and has a long service life. The butterfly valve has a unique structure, and the "switch" can be completed only by turning the valve stem 90°. The operation is flexible, convenient, labor-saving, not affected by the medium pressure, and the sealing performance is reliable.

The multi-level hard sealing butterfly valve adopts a "U"-shaped stainless steel sealing ring, which is in three-dimensional eccentric contact with the polished butterfly plate. It solves the disadvantage that the sealing surface of the traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing 0°-10°, and realizes the effect that the sealing surface of the butterfly plate is separated at the moment of opening and the sealing is closed when the contact is closed, so as to prolong the service life and seal. performance purpose. Therefore, the multi-layer hard sealing butterfly valve is widely used in the pipelines of metallurgy, electric power, petroleum, chemical industry, air, gas, combustible gas, water supply and drainage and other corrosive media with medium temperature ≤550℃. It is a device for regulating flow and cutting off fluid. .

Multi-level hard sealing butterfly valve is suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, about three times that of the gate valve, when selecting the butterfly valve, the influence of the pipeline system by the pressure loss should be fully considered, and the firmness of the butterfly plate to withstand the pressure of the pipeline medium should also be considered when it is closed. sex.

The main structural features of the multi-level hard sealing butterfly valve are wafer type and flange type triple eccentric sealing. The plate does not contact the sealing seat, which eliminates the uneven load of the sealing seat, prolongs the service life, ensures reliable sealing performance, and has the characteristics of high temperature resistance, wear resistance and corrosion resistance.

The disc of the multi-level hard sealing butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is in a fully open state.

In the traditional concept, the multi-layer hard sealing butterfly valve can only be used in occasions with normal temperature, low pressure and low sealing requirements. With the continuous development of modern technology and material industry, the application range of multi-layer hard sealing butterfly valve has far exceeded the past, and can almost replace most traditional valves, and is widely used in various fields of industry.

Before installing the multi-layer hard sealing butterfly valve, it is necessary to confirm whether the product performance and the medium flow direction arrow are consistent with the motion conditions, and scrub the inside of the valve. It is not allowed to have impurities attached to the sealing ring and ball plate. It is allowed to close the paddle so as not to damage the seal. The mounting flange of the multi-level hard-sealed butterfly valve should be a special flange for the butterfly valve. The installation position in the pipeline is vertical, but it cannot be inverted.

Installation test and adjustment of multi-layer hard sealing butterfly valve:

1. The multi-layer hard sealing butterfly valve, whether it is pneumatic, hydraulic, manual, electric, etc., has been strictly debugged before leaving the factory. When testing the sealing performance, the user should firstly fix the inlet and outlet sides of the valve body evenly, and close the disc. Valve, apply pressure to the side of the multi-layer hard-sealed butterfly valve, and observe whether there is leakage on the outlet side. Before the strength test of the pipeline, the disc plate should be opened to prevent damage to the sealed auxiliary air compressor crown ring valve. Safety valve, spring type Safety valve, micro-opening safety valve, stainless steel safety valve, steam safety valve.

2. Although the multi-layer hard sealing butterfly valve has been strictly inspected and tested before leaving the factory, it is inevitable that some products will automatically displace the screws during transportation, which needs to be re-adjusted, pneumatic, hydraulic, etc. Please read the operating instructions of the supporting drive device carefully. .

3. The opening and closing stroke of the control mechanism has been adjusted when the multi-level hard sealing butterfly valve leaves the factory. In order to prevent the power from being turned on in the wrong direction, the user first turns on the manual to the half-open position after turning on the power for the first time.