网络优化资料：

Usually valves have two characteristics: use characteristics and structural characteristics.

use:

The main performance and scope of the valve have been confirmed, and the characteristics of the valve are: valve types (closed-circuit valves, regulating valves, safety valves, etc.); product types (gate valves, globe valves, butterfly valves, ball valves, etc.); valve main components ( Valve body, valve cover, valve stem, valve disc, sealing surface); valve driving method, etc.

Building features:

The installation, repair, and maintenance methods adopted by the system have certain structural characteristics, which belong to the structural characteristics of the normally closed solenoid valve: the structural length and overall height of the valve, and the connection method with the pipeline (flange connection, thread connection, clamp connection, External thread connection, end surface connection, etc.); the form of the sealing surface (inlay ring, threaded ring, surfacing, spray welding, valve body); the structure of the valve stem (rotating rod, lifting rod, etc.), etc.

The steps and basis for selecting the valve are roughly as follows:

aSelect the step.

②Understand the purpose of the valve in the equipment or device, the use of the valve: applicable medium, working pressure, working temperature, etc.

b Determine the nominal diameter and connection method of the valve connecting pipeline: flange, thread, welding, etc.

c Determine the operation mode of the valve: manual, electric, electromagnetic, pneumatic water solenoid valve or hydraulic, electrical connection or electro-hydraulic connection, etc.

Determine the housing and internal materials of the selected valve 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.

Selected valve types: closed circuit valves, regulating valves, safety valves, etc.

Confirm the valve type: gate valve, globe valve, ball valve, butterfly valve, throttle valve, safety valve, pressure reducing valve, steam trap, etc.

⑦Determination of valve parameters: For automatic valves, determine the allowable flow resistance, exhaust volume, back pressure and other parameters as needed, and then determine the nominal diameter of the pipeline and the valve seat diameter.

⑨Determine the geometric parameters of the selected valve: structural length, flange connection form and size, height dimension after opening and closing of the valve, bolt hole size and number of connections, overall external dimensions of the valve, etc.

⑧Using existing information: select the appropriate valve product: product catalog, valve product samples, etc.