The installation and maintenance of butterfly valve should pay attention to the following items

The installation and maintenance of butterfly valve should pay attention to the following matters:
1. During installation, the valve disc should be stopped at the closed position
. The opening position shall be determined according to the rotation angle of the butterfly plate
3. For butterfly valve with bypass valve, the bypass valve shall be opened before opening “. The installation shall be carried out according to the installation instructions of the manufacturer. For heavy butterfly valve, a firm foundation shall be set A 6033 I. concentric butterfly valve. The structure of the butterfly valve is characterized by that the stem axis, butterfly plate center and body center are in the same position. Simple structure and convenient manufacture. The common rubber lined butterfly valve belongs to this type. The disadvantage is that the butterfly plate and the valve seat are always in the state of extrusion, scraping, large resistance distance and fast wear

. In order to solve the extrusion problem between the butterfly plate and the valve seat of the concentric butterfly valve, the single eccentric butterfly valve is produced. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the axis of rotation, disperse, and reduce the
degree extrusion between the upper and lower ends of the butterfly plate and the valve seat A 6033 three, double eccentric butterfly valve is the most widely used double eccentric butterfly valve. The structure is characterized in that the valve stem axis deviates from both the center of butterfly plate and the center of body. The effect of double eccentricity makes the butterfly plate break away from the seat of
immediately after the valve is opened, greatly eliminating the unnecessary over extrusion and scraping between the butterfly plate and the seat, reducing the opening distance, reducing the wear and improving the service life of the seat
four and three eccentric butterfly valves must be resistant to high temperature, hard seal must be used, but the leakage is large; zero leakage, soft seal must be used, but not high temperature. In order to overcome the contradiction of double eccentric butterfly valve, the third eccentric of butterfly valve was carried out
butterfly valve is a kind of valve which uses a circular butterfly plate as the opening and closing part and turns with the valve rod to open, close and adjust the fluid channel. The butterfly valve is not only simple in structure, small in volume, light in weight, low in material consumption, small in installation size, but also small in driving torque, simple in operation, fast in operation, and also equipped with
has good flow regulation function and close sealing characteristics. In the field of large and medium caliber, medium and low pressure, butterfly valve is the leading valve form With the application of anti-corrosion synthetic rubber and polytetrafluoroethylene, the performance of the butterfly valve can be improved and meet different working conditions. In recent ten years, the metal seal butterfly valve has developed rapidly. With the application of high temperature, low temperature, strong corrosion, strong erosion and high strength alloy materials in the butterfly valve, the metal seal butterfly valve has been widely used in high temperature, low temperature, strong erosion and other working conditions, and partially replaced the stop valve, gate valve and ball valve Structural features of
: the butterfly valve has the advantages of simple structure, small volume, light weight, low material consumption, small installation size, fast switch, 90 ° reciprocating rotation, small driving torque, etc. it is used to cut off, connect and regulate the medium in the pipeline, with good fluid control characteristics and closing sealing performance of
A603 nominal pressure or pressure level: pn1.0-4.0mpa, ANSI class 150-300lb, jis10-20k a603 nominal diameter or caliber: Dn40 ~ 2000 a603 connection mode: flange connection, wafer connection, butt welding connection and lug to clamp connection a603 applicable temperature: – 196 ℃ ~ 700 ℃ a603 driving mode: manual, worm gear drive, pneumatic, electric, hydraulic, pneumatic, hydraulic, hydraulic, electro-hydraulic Materials of movable
valve body: HT200, WCB, zg1cr18ni9ti, zg1cr18ni12mo2ti, CF8 (304), CF3 (304L), CF8M (316), cf3m (316L), Ti.

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