Installation and Maintenance of Butterfly valve

Author:     Published time:2016-10-11 10:40     Reading times:434    

  Butterfly valve can be divided into pneumatic butterfly valve, electric butterfly valve, manual butterfly valve, butterfly valve is a circular disc for opening and closing parts and with the valve stem to open, close and adjust the fluid channel of a valve. Butterfly valve disc installed in the pipe diameter direction. In the butterfly valve body cylindrical channel, the disc-shaped butterfly plate around the axis of rotation, rotation angle of 0  ~ 90 degree  between the rotation to 90 degree, the valve is fully open card status. Butterfly valve, also known as flap valve, is a simple structure of the control valve, but also can be used for low-pressure pipe media switch control. Butterfly valve is a closed (disc or disc) for the disc, rotating around the valve shaft to achieve the opening and closing of a valve, cut off the main pipeline and throttling. Butterfly valve opening and closing pieces is a disc-shaped butterfly plate, the valve body around its own axis of rotation, so as to achieve the purpose of opening and closing or regulation. Butterfly valve is fully open to full close is usually less than 90 degree, butterfly valve and butterfly rod itself has no self-locking ability, in order to disc positioning, to install the worm reducer stem. The use of worm reducer, not only can make the butterfly plate has a self-locking ability to stop the butterfly plate in any position, but also improve the operational performance of the valve. Industrial butterfly valve for high temperature, the pressure range is also high, the valve nominal diameter, the valve body made of carbon steel, the valve plate of the ring with metal ring instead of rubber ring. Large high-temperature butterfly valve welded steel manufacturing, mainly used for high-temperature medium smoke duct and gas pipeline.

 

   Butterfly valve according to the structure can be divided into offset plate, vertical plate, ramp plate and lever. According to the seal can be divided into more sealed and hard seal type two. Soft seal type rubber ring is generally used to seal, hard seal type usually used metal ring seal. According to the connection type can be divided into flange connection and the folder-type connection; by transmission can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

First, the advantages of butterfly valve

1, opening and closing convenient and rapid, effort, fluid resistance is small, can often operate.

2, the structure is simple, small size, light weight.

3, you can transport slurry, the pipeline at least the accumulation of liquid at the mouth.

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

5, regulating performance.

Second, the shortcomings of the butterfly valve

1, the use of pressure and operating temperature range.

2, poor sealing.

Third, the butterfly valve installation and maintenance

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

2, the opening position should be based on the rotation angle disc to determine.

3, with a bypass valve butterfly valve, open the bypass valve should be preceded by the first.

4, should be installed according to the manufacturer's installation instructions, the weight of the butterfly valve, should be set up a solid foundation.

5, butterfly valve disc installed in the pipe diameter direction. In the butterfly valve body cylindrical channel, the disc-shaped butterfly plate around the axis of rotation, rotation angle of 0 ~ 90 degree between the rotation to 90 degree, the valve is fully open card status.

6, if the requirements of the butterfly valve as a flow control, the main thing is to correctly select the valve size and type. Butterfly valve structure is particularly suitable for the production of large diameter valves. Butterfly valve not only in the oil, gas, chemicals, water treatment and other general industry is widely used, but also used in thermal power plant cooling water system.

7, commonly used butterfly valve on the clip-on butterfly valve and flange butterfly valve two. Wafer type butterfly valve is a double-headed bolt to connect the valve between the two pipe flange, flange valve is a flange on the valve, with both ends of the valve flange bolts connected to the pipeline flange.

8, butterfly valve disc installed in the pipe diameter direction. In the butterfly valve body cylindrical channel, disc-shaped butterfly plate around the axis of rotation, the rotation angle of 0 ~ 90 degree  between the rotation to 90 degree, the valve is fully open card status.


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