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Flange type butterfly valve characteristics and working principle

2018-08-06

henan on valve co., ltd. mainly produces gas butterfly valve is divided into flange type butterfly valve, wafer type metal hard seal butterfly valve, electric wafer type hard seal butterfly valve, manual wafer type butterfly valve, pneumatic wafer type butterfly valve, manual flange type hard seal butterfly valve, electric flange type butterfly valve, etc. The following is an introduction to the characteristics and working principle of the flanged butterfly valve.

Gas butterfly valve in the flange type butterfly valve is the valve with flange, with bolts on both ends of the valve flange connected to the pipeline. The sealing surface is wear-resistant and has a long service life. Flexible operation, labor-saving, convenient, not back by the medium pressure of high, low impact.

The flange type bolt is relatively short, and the length is "2 times the flange thickness and 2 nuts thickness", that is, the flange of the valve body and the flange on the pipeline are paired, connected by bolts, and the lock nut is locked; When the flange bolt at one end The nut is removed, it does not affect the normal operation of the pipeline at the other end.

Working principle: The disc plate is driven by the valve stem. If it turns 90 °, it can complete an opening and closing. Changing the deflection angle of the disc plate can control the medium flow. Commonly used butterfly valve with wafer type butterfly valve and flange type butterfly valve two. Wafer butterfly valve is to use studs to connect the valve between two pipe flanges, and flange butterfly valve is on the valve with a flange, with screws on both ends of the valve flange connected to the pipe flange. The following mainly introduces the common sense of the flange butterfly valve.

Flange type gas butterfly valve

Flange type butterfly valve working characteristics:

(1) Flange butterfly valve structure is simple, small size. Compact structure, short structure length, small size, light weight, suitable for large caliber.

(2) The fluid resistance is small. When fully opened, the effective flow area of the valve seat channel is large and the fluid resistance is small.

(3) The opening and closing is rapid, the adjustment is good, and the butterfly plate rotates 90. Can be completed on and off. By changing the rotation angle of the butterfly plate, the flow rate can be controlled in stages.

(4) The opening and closing torque is small, because the butterfly plates on both sides of the rotating shaft are basically equal under the action of the medium, and the direction of the torque is opposite, so the opening and closing is labor-saving.

(5) low pressure sealing performance is good, the sealing surface is generally made of rubber, plastic, so the sealing performance is good. Limited by the material of the sealing ring, the operating pressure and operating temperature range of the butterfly valve are small. However, the operating pressure and working temperature range of the hard seal butterfly valve have been greatly improved. Other more gas butterfly valve knowledge can consult the company 13703820603 or 15551530000 to the manager