How to choose solenoid valve?

-What is solenoid valve?
Solenoid valve is an industrial equipment controlled by electromagnetic, and it is an automatic basic component used to control flfluid. It belongs to an actuator and is not limited to hydraulic and pneumatic. Used in industrial control systems to adjust the direction, flflow, speed and other parameters of the medium. The solenoid valve can cooperate with different circuits to achieve the desired control, and the accuracy and flflexibility of the control can be guaranteed. Solenoid valve selection should fifirst follow the four principles of safety, reliability, applicability, and economy, followed by on-site working conditions in six aspects (that is, pipeline parameters, flfluid parameters, pressure parameters, electrical parameters, action methods, Special requirements to choose)

        

-Selection Basis:

1. Select the solenoid valve according to the pipeline parameters: diameter specifification (ie DN), interface mode
① Determine the diameter (DN) size according to the on-site pipeline inner diameter size or flflow requirements;
② Interface method, generally >DN50 should choose flflange interface, ≤DN50 can be freely selected according to user needs.

2. Select the solenoid valve according to the flfluid parameters: material, temperature group
① Corrosive flfluid: Corrosion-resistant solenoid valve and all stainless steel should be selected; Edible ultra-clean flfluid: Food-grade stainless steel solenoid valve should be selected;
② High-temperature flfluids: Solenoid valves made of high-temperature resistant electrical materials and sealing materials should be selected, and the piston type should be selected;
③ Fluid state: large to gaseous, liquid or mixed state, especially when the diameter is greater than DN25, it must be distinguished;
④ Fluid viscosity: usually below 50cSt, it can be arbitrarily selected. If this value is exceeded, a high viscosity solenoid valve should be used.

3. Selection of solenoid valves according to pressure parameters: principles and structural varieties
① Nominal pressure: The meaning of this parameter is the same as that of other general valves, and it is determined according to the nominal pressure of the pipeline;
② Working pressure: If the working pressure is low, you must choose the direct-acting or step-by-step direct-acting principle; when the minimum working pressure difference is above 0.04Mpa, direct-acting, step-by-step direct-acting, and pilot-type can be selected.

5. Choose according to the length of continuous working time: normally closed, normally open, or sustainable power

① When the solenoid valve needs to be opened for a long time, and the duration is longer than the closing time, the normally open type should be selected;

② If the opening time is short or the opening and closing time is not much, choose the normally closed type;

③ However, some working conditions for safety protection, such as furnace and kiln flflame monitoring, cannot be selected as normally open,and long-term electrifification type should be selected.

-Selection Principle:

1. Corrosive media: plastic king solenoid valve and all stainless steel should be selected; for strongly corrosive media, isolation diaphragm type must be used. For the neutral medium, the solenoid valve with copper alloy as the material of the valve shell should also be selected. Other- wise, rust debris often falls off in the valve shell, especially in the occasion of infrequent movement. The valve for ammonia cannot use copper.
2. Explosive environment: the corresponding explosion-proof products must be selected, and waterproof and dustproof products should be selected for outdoor installation or dusty occasions.

3. Pressure: The nominal pressure of the solenoid valve should exceed the maximum working pressure in the pipe.

  

Applicability:

1. Medium characteristics: different types of solenoid valves are selected for the quality gas, liquid state or mixed state; the medium temperature should be selected within the allowable range of the solenoid valve.

2. Pipeline parameters: select the valve port and model according to the requirements of the medium flflow direction and pipeline connection;

3. Environmental conditions: the highest and lowest temperature of the environment should be selected within the allowable range;Choose different valves for different environments, such as: waterproof / anti-corrosion / explosion-proof, etc.

4. Power contion: AC and DC solenoid valves are selected according to the type of power supply.

The above is the introduction of Selection Basis to choose solenoid valve, hoping to help you understand the purpose and selection of solenoid valves. If you have any needs for valves, please consult us for selection services and discounted prices. inquiry@covna-china.com