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Solenoid valve selection should first follow the four principles of safety, reliability, applicability, economy, followed by six aspects of the field conditions (namely, pipeline parameters, fluid parameters, pressure parameters, electrical parameters, mode of action, special requirements to choose).

Selection basis:

First, according to the pipeline parameters to select solenoid valve: diameter specification (i.e.), interface mode according to the field pipe diameter size or flow requirements to determine the size of diameter 0.Interface mode, general > to choose flange interface,< can be freely selected according to user needs.

Second, according to the fluid parameters of the solenoid valve: material, temperature groupCorrosive fluid: should choose corrosion resistant solenoid valve and all stainless steel; Edible ultra-clean fluid: food grade stainless steel solenoid valve should be selected.High temperature fluid: the solenoid valve made of high temperature resistant electrical materials and sealing materials should be selected, and the type of piston structure should be selected.Liquid state: large to gaseous, liquid or mixed state, especially when the diameter is larger than the order must be distinguished., fluid viscosity: usually in the following can be arbitrarily selected, if more than this value, to choose high viscosity solenoid valve.

Third, according to the pressure parameters to choose the solenoid valve: principle and structure varietiesNominal pressure: this parameter and other general valve meaning is the same, is based on the nominal pressure of the pipelineWorking pressure: if the working pressure is low, it must choose direct motion or step by step direct motion principle; When the minimum working pressure difference is above, direct acting type, step by step direct acting type and pilot type can be selected.

Fourth, electrical selection: voltage specifications should be preferred as far as possible, more convenient.

Fifth, according to the length of continuous working time to choose: normally closed, normally open, or sustainable electricityWhen the solenoid valve needs to open for a long time, and the continuous time is more than the closing time should be used normally open.If the open time is short or open and close time is not much, then choose normally closed type.However, some working conditions for safety protection, such as furnace and kiln flame monitoring, can not choose normally open, should choose long-term electrified type

Sixth, according to the environmental requirements to select auxiliary functions: explosion-proof, check, manual, waterproof fog, water spray, diving explosive environment: the corresponding explosion-proof solenoid valve must be selectedWhen there is a backflow of fluid in the tube, the solenoid valve with check function can be selected.When you need to manually operate the solenoid valve on site, you can choose the solenoid valve with manual function.Open air installation or dust more occasions should choose waterproof, dustproof varieties (protection grade above).

Solenoid valve is an automatic basic element used to control the direction of fluid, belonging to actuator; It is usually used in mechanical control and industry
Above the valve, the medium direction is controlled, so as to control the valve switch.

Solenoid valves are divided into three categories in principle:

1)    direct acting solenoid valve:

Principle: when energized, the solenoid coil generates electromagnetic force to lift the closing part from the valve seat and open the valve; when powered off, the electromagnetic force disappears, the spring presses the closing part on the valve seat and the valve closes.

Features: it can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.

2)    distribution solenoid valve Direct acting solenoid valve:

Principle: it is a combination of direct acting and pilot type. When there is no pressure difference between the inlet and outlet, the solenoid force will directly lift the small pilot valve and the closing parts of the main valve upward and open the valve. When the inlet and outlet reach the starting pressure difference, the solenoid force will pilot the small valve, the pressure in the lower chamber of the main valve will rise and the pressure in the upper chamber will fall, so as to facilitate the opening of the valve Push the main valve upward with differential pressure; when power is off, the pilot valve uses spring force or medium pressure to push the closing part and move downward to close the valve.

Features: it can also act when there is zero differential pressure or vacuum and high pressure, but the power is large, so it must be installed horizontally.

3)    pilot solenoid valve:

Principle: when power is on, the solenoid force opens the pilot hole and the pressure in the upper chamber drops rapidly, The pressure difference between the lower part and the higher part is formed around the closing part, the fluid pressure pushes the closing part to move upward, and the valve opens; in case of power failure, the spring force closes the pilot hole, the inlet pressure quickly forms the pressure difference between the lower part and the upper part around the valve closing part through the bypass hole, and the fluid pressure pushes the closing part to move downward to close the valve.

Features: the upper limit of the fluid pressure range is high, which can be installed arbitrarily (to be customized) but the fluid differential pressure condition must be met.

Pneumatic transmission and control technology, referred to as pneumatic, is the compressed air as the working medium to carry out energy and signal transmission, is to achieve a variety of production process, automatic control of a technology.  It is an important part of fluid transmission and control.  In recent decades, pneumatic transmission technology has been widely used in industrial automation and labor-saving, and has played a very important role in promoting the development of automation.  Pneumatic has many advantages in practical application  

1. Easy to use  

Air as a working medium, air everywhere, convenient source, directly discharged into the atmosphere after use, will not pollute the environment, can be set less or do not have to set back air pipeline.  

2. The system is easy to assemble  

The use of quick couplings makes piping very simple, so system assembly, maintenance, and component replacement are simple.  

3. It’s quick  

Quick action and quick reaction, can reach the required pressure and speed in a short time.  Under a certain overload operation can also ensure the safety of the system, and is not easy to overheating phenomenon.  

4. Safe and reliable  

Compressed air does not explode or catch fire and does not require expensive explosion-proof facilities to be used in flammable and explosive places.  Can be safely and reliably used in flammable, explosive, dust, radiation, strong magnetic, vibration, impact and other harsh environment.  

5. Easy storage  

The air pressure has a high self-holding capacity, compressed air can be stored in the gas tank, ready to use.  The pneumatic system maintains a stable pressure even when the compressor stops running and the valve is closed.  Therefore, the continuous operation of the compressor is not required.  

6. Long-distance transmission  

Because the viscosity of air is small, the flow resistance is small, the pressure loss of air flow along the pipeline is small, which is conducive to the concentrated supply of media and long-distance transportation.  Air is easily piped, regardless of distance.  

7. Overload protection  

Pneumatic mechanism and working parts can be overloaded and stop, so there is no danger of overload.  

8. Clean   

Basic pollution-free, for the requirements of high purification, pollution-free occasions, such as food, printing, wood and textile industry is very important, pneumatic has a unique adaptability, better than hydraulic, electronic, electrical control.  

Solenoid valve selection guide

Before choosing a type of solenoid valve, sufficient information about the application must be gathered. This guide describes the key parameters for solenoid valves.

Important Information

These are the most important guidelines when selecting a solenoid valve. Keep these guidelines in mind before choosing a valve.

• Solenoid valves are very sensitive to dirt and only work with clean liquids or air.

• Note that indirectly controlled solenoid valves require a permanent pressure differential of around 0.5 bar to function properly. Therefore, you can not use indirect operated valves in a closed circuit or systems with a low inlet pressure. Direct and semi-direct operated valves operate with a pressure differential from 0 bar.

• Make sure that the used medium and temperature are compatible with the materials of the valve, such as body and the seal materials.

• Solenoid valves open and close fast (between around 10 and 1000 ms). Improper use can cause pressure transients in the system (water hammer).

Principle of operation

There are different types of solenoid valves, each with different principles of operation:

• Direct operated (operating from 0 bar)

• Semi-direct operated (operating from 0 bar)

• Indirect operated (pressure differential required, normally at least 0.5 bar)

It is important to choose the right operation principle. Direct operated valves operate from 0 bar. In the valve there is a small orifice which is sealed off by a plunger with a polymer gasket. If the solenoid (electromagnet) is electrically energized, the plunger is lifted by the electromagnetic force and the valve opens. This principle is often used for small valves and is suitable for small flow rates. For larger flow rates, a semi-direct or indirect operated valve is recommended. Both make use of the medium pressure to open and close the valve. Semi-direct operated valves operate from 0 bar and often have a more powerful coil than indirect operated valves. Indirect operated valves need a permanent pressure differential of around 0.5 bar for proper operation. The advantage of indirectly operated valves is that they usually can control large flows with a relatively small coil and thereby have a reduced energy consumption.

Check if there is a permanent pressure differential over the valve of at least 0.5 bar. In this is the case, an indirect operated valve may be chosen (a semi-direct valve is of course also allowed in this case). If this is not the case (low inlet pressure, closed circuit, ..), choose a (semi-)direct operated solenoid valve.

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