Valve pressure parts: cast copper, cast iron, ductile iron, high silicon cast iron, cast steel, forged steel, high and low alloy steel, stainless acid-resistant steel, Hastelloy, Inconel, Monel, duplex stainless steel , Titanium alloys, etc. And can produce various electric, pneumatic, hydraulic valve drive devices. Faced with so many valve varieties and such complex various working conditions, pneumatic ball valves should choose the most suitable valve product for the pipeline system. I think that we should first understand the characteristics of the valve; secondly, we should master the steps and basis for selecting the valve; The person should follow the principle of selecting the valve. There are generally two types of valve characteristics, use characteristics and structural characteristics. Use characteristics: It determines the main performance and scope of use of the valve. The characteristics of the valve are: valve category (closed circuit valve, regulating valve, safety valve, etc.); product type (gate valve, globe valve, butterfly valve, ball valve, etc.) ; The material of the main parts of the valve (valve body, bonnet, valve stem, valve clack, sealing surface); valve transmission mode, etc.
Structural characteristics: It determines some structural characteristics of the valve installation, repair, maintenance and other methods. The structural characteristics include: the structural length and overall height of the valve, and the connection form with the pipeline (flange connection, threaded connection, clamp connection , External thread connection, welding end connection, etc.); the form of the sealing surface (inlaid ring, threaded ring, surfacing, spray welding, valve body); valve stem structure (rotating rod, lifting rod), etc. The steps and basis for selecting the valve are generally as follows: The selection step clarifies the purpose of the valve in the equipment or device, and determines the working conditions of the valve: applicable medium, working pressure, working temperature, etc. Determine the nominal diameter and connection method of the pipeline connected to the valve: flange, thread, welding, etc. Determine the way to operate the valve: manual, electric, electromagnetic, pneumatic or hydraulic, electrical linkage or electro-hydraulic linkage, etc. Determine the material of the selected valve housing and internal parts according to the medium, working pressure and working temperature of the pipeline: gray cast iron, malleable cast iron, ductile iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloy, etc.
