Installation and maintenance of the butterfly valve precautions

8873必赢bwin www.joshuaszostak.com Butterfly valve installation and maintenance should note the following:

1. installation, the valve to stop in the closed position.

2. open position in accordance with the butterfly plate rotation angle to determine.

3. butterfly valve with bypass valve turned on before you turn on the bypass valve.

4. installation should be carried out according to the manufacturer's installation instructions, butterfly valve weight, should set a firm foundation.

concentric butterfly structural characteristics of the butterfly valve stem axis, the center of the disc, the body center at the same position. Simple structure, and ease of manufacture. The common rubber lined butterfly valves that fall into this category. The drawback is the butterfly plate and the valve seat is always in the squeeze, scratch status, resistance from the large, fast wear.

Second, a single eccentric butterfly valve to solve the concentric butterfly valve disc and seat extrusion, the resulting single eccentric butterfly valve, its structural characteristics of the stem axis deviation from the center of the disc, so that under the butterfly board the client is no longer become a rotating axis, dispersing, reducing the excessive compression of the lower end of the butterfly board and seat.

three double eccentric butterfly valve on the basis of the single eccentric butterfly valve further improved molding is the most widely used double eccentric butterfly. Its structure is characterized by the stem axis both deviate from the center of the disc, and also deviate from the body center. The effect of double eccentric valve is turned disc immediately from the seat to substantially eliminate unnecessary excessive compression disc seat, scratching phenomenon, reducing the open resistance from the reduce wear, improve the valve seat life.

four triple eccentric butterfly valve to high temperature, you must use the hard seal, but large leakage; want zero leakage, you must use a soft seal, but not high temperature. To overcome this contradiction of the double eccentric butterfly, butterfly valves, Third eccentric.

butterfly valve opening and closing parts circular disc with stem rotation to open, close and adjust a valve of the fluid channel. Butterfly not only simple in structure, small size, light weight, material consumption province, small installation size, and the drive torque is small, easy to operate, quick, and also at the same time has a good flow regulation and shut down the sealing characteristics in medium and large-caliber, the use of low-pressure areas, the butterfly valve is the dominant form of the valve.

With the application of anticorrosive synthetic rubber and PTFE butterfly valve performance can be improved, and meet in different working conditions. The last decade, the rapid development of metal sealing butterfly valve, with high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion, high strength alloy material in the butterfly valve, metal sealed butterfly valve in the high-temperature, low temperature, strong erosion a wide range of applications, and other working conditions, and partially replace the shut-off valve, gate valve and ball valve.

structural features: butterfly valve has a simple structure, small size, light weight, material consumption province, small installation size and quickly switch 90 ° reciprocating rotary drive torque characteristics for truncation, turn regulating pipeline of medium, having a good fluid control features on and off the sealing performance.