What kind of valve to choose?

In fluid pipeline systems, valves are control components whose main functions are to isolate equipment and pipeline systems, regulate flow, prevent backflow, regulate and relieve pressure. Since it is very important to select the most suitable valve for the pipeline system, we must understand the steps and basis for selecting valves, so that we can select the valve that is most suitable for the on-site working conditions. 1. Selection steps ① Clarify the purpose of the valve in the equipment or device, and determine the working conditions of the valve: Applicable medium, working pressure, working temperature, etc. 　　② Determine the nominal diameter and connection method of the pipe connected to the valve: Flanges, threads, welding, etc. 　　③ Determine how to operate the valve: Manual, electric, electromagnetic, pneumatic or hydraulic, electrical linkage or electro-hydraulic linkage, etc. 　　④ Determine the materials of the selected valve shell and internal parts based on the medium transported by the pipeline, working pressure, and working temperature.: Gray cast iron, malleable cast iron, ductile iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloy, etc. 　　⑤ Choose the type of valve: Closed-circuit valves, regulating valves, safety valves, etc. 　　⑥ Determine the type of valve: Gate valves, globe valves, ball valves, butterfly valves, throttle valves, safety valves, pressure reducing valves, steam traps, etc. 　　⑦ Determine valve parameters: For automatic valves, first determine the allowable flow resistance, discharge capacity, back pressure, etc. according to different needs, and then determine the nominal diameter of the pipeline and the diameter of the valve seat hole. 　　⑧ Determine the geometric parameters of the selected valve: Structural length, flange connection form and size, height dimension of the valve after opening and closing, size and number of connecting bolt holes, external dimensions of the entire valve, etc. ⑨ Use existing data: Choose the appropriate valve product from the valve product catalog, valve product samples, etc. 2. Basis for Selection While understanding the steps for selecting valves, you should also further understand the basis for selecting valves. 　　① The purpose, operating conditions and operation control method of the selected valve. 　　② Nature of working medium: Working pressure, working temperature, corrosion performance, whether it contains solid particles, whether the medium is toxic, whether it is a flammable or explosive medium, the viscosity of the medium, etc. 　　③ Requirements for valve fluid characteristics: Flow resistance, discharge capacity, flow characteristics, sealing grade, etc. 　　④ Installation dimensions and overall dimensions requirements: Nominal diameter, connection method and connection size to the pipeline, overall dimensions or weight limit, etc. 　　⑤ Additional requirements for the reliability, service life of valve products and the explosion-proof performance of electric devices. (Please note when selecting parameters: If the valve is to be used for control purposes, the following additional parameters must be determined: Method of operation, maximum and minimum flow requirements, pressure drop for normal flow, pressure drop when closed, maximum and minimum inlet pressure of the valve. ) Based on the above-mentioned basis and steps for selecting valves, when selecting valves reasonably and correctly, you must also have a detailed understanding of the internal structures of various types of valves, so that you can make a correct decision on the preferred valve. The final control of the pipeline is the valve. The valve opening and closing parts control the flow pattern of the medium in the pipeline. The shape of the valve flow channel gives the valve certain flow characteristics. This must be taken into consideration when selecting the most suitable valve for installation in the pipeline system.

The pressure of this kind of pipeline is 10.1MPa, the temperature is 245 degrees, and the medium is a mixture of hydrogen, carbon monoxide, and carbon dioxide, which is an explosive and toxic gas. You should choose a valve with good sealing performance, temperature resistance and high pressure resistance. I recommend a valve that can meet the above parameters. Model ZF43Y, DN20-300 Pressure 1.6-32.0MPa Temperature -29--425c Material WCB 304 316