Cast Steel Butterfly

brief introduction

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of butterfly valve body, the disc type butterfly plate rotates around the axis with the rotation angle between 0 ° - 90 °. When it rotates to 90 °, the valve will be fully open.

Butterfly valve is simple in structure, small in volume and light in weight, and only consists of a few parts. Moreover, the valve can be opened and closed quickly with only 90 ° rotation, and the operation is simple. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the butterfly plate thickness is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valve has two types of seal: elastic seal and metal seal. Elastic sealing valve, sealing ring can be inlaid on the valve body or attached to the periphery of butterfly plate.

The service life of the valve with metal seal is generally longer than that of the valve with elastic seal, but it is difficult to achieve complete seal. The metal seal can adapt to the higher working temperature, while the elastic seal has the limitation of temperature.

If butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of valve. The structure and principle of butterfly valve is especially suitable for making large diameter valve. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also in the cooling water system of thermal power station.

There are two kinds of butterfly valves commonly used: wafer butterfly valve and flange butterfly valve. The double clip butterfly valve is connected between two pipe flanges with stud bolts. The flange butterfly valve has flange on the valve, and the flange on both ends of the valve is connected to the pipe flange with bolts.

purpose

It is used for gas pipeline in sulfuric acid industry: inlet and outlet of blower in front of furnace, inlet and outlet of relay fan, electric demist series and connecting valve, inlet and outlet of S02 main blower, converter regulation, inlet and outlet of preheater, etc. to regulate and cut off gas volume.

The sulfur burning, conversion and dry absorption section used in the sulfur based sulfuric acid system is the preferred brand of valves for sulfur based sulfuric acid plant, which are considered by the majority of users as follows: butterfly valves with good sealing performance, light operation, corrosion resistance, high temperature resistance, convenient operation, flexibility, safe and reliable use, have been widely used.

It is also widely used in the pipeline of SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, alkali, sea water, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid and other media in chemical, petrochemical, smelting, pharmaceutical, food and other industries as regulating and intercepting devices.

Structural characteristics

①The unique design of the three-way eccentricity makes the sealing surfaces drive without friction, and prolongs the service life of the valve.

②Elastic seal produced by torque.

③The cuneiform design makes the valve have the function of automatic sealing which is closer and tighter, and the sealing faces have compensation and zero leakage.

④Small size, light weight, light operation, easy to install.

⑤According to the requirements of users, pneumatic and electric devices can be configured to meet the needs of remote control and program control.

⑥The material of replacement parts can be applied to various media, and the lining can be anticorrosive (lining F46, gxpp, Po, etc.).

⑦Continuous structure diversification: wafer, flange, butt welding.