【 Weak current College 】 solenoid valve selection tips

1. Security: do not pay attention to safety that will result in disaster!

1. corrosive media: use plastic solenoid valve and the entire stainless steel; for strong corrosive medium must choose the isolation diaphragm. Neutral medium, also use copper alloy as the valve casing material of solenoid valve, the valve casing in rust scrap loss, particularly action not frequent occasions. Ammonia uses the valve cannot be used copper.
2. explosive environment: you must choose the corresponding explosion-proof grade products, open installation or more occasions dust should use waterproof, dust-proof varieties.
3. solenoid valve nominal pressure exceeding tubes operating pressures.

II. applicability: not applicable equal to spend money on fees, but also any trouble!

1. media features

1.1-gas, liquid or mixture of different varieties were selected solenoid valve, it is best to set the media status when the penitent, installed the user does not have to be adjustable.
1.2 medium temperature different specifications of the product, otherwise the coil will burn, seals aging, seriously affecting the life of life.
1.3 medium viscosity, usually in 50cSt below. If more than this value, the path is greater than 15mm solenoid valves for special orders. Sizes smaller than 15mm provides high viscosity solenoid valve.
1.4 media high cleanliness not should be in the solenoid valve before loading kick filtration valve, low pressure fashion can choose straight diaphragm solenoid valve.
1.5 .5if directional flow, and does not allow the clock back.
1.6 medium temperature should be chosen in the solenoid valve allowed range.

2. pipeline parameters

Requirements under media flows 2.1 and pipe connection method selection valve vents and models.
2.2 under flow and valve Kv value selected nominal diameter, optional with internal diameter of the pipe. Please note that some manufacturers are not marked with the Kv value, often valve hole diameter size is smaller than the interface, and must not seek the lowest prices and delays.
2.3 operating pressure: minimum working pressure is above the 0.04Mpa use indirect pilot; minimum working pressure close to or less than zero, you must use direct-acting or step-by-step direct type.

3. environmental conditions

3.1 environment of maximum and minimum temperature should be within the scope of the permit, if the variance is required for special orders.
3.2 environment relative humidity is high and there are drops of rain, etc, should be waterproof solenoid valve
3.3 environment often have vibration, bump and shock, and other occasions or special varieties, such as marine solenoid valve.
3.4 in corrosive or explosive environments use should give priority to choose based on your security requirements, corrosion resistant
3.5 environment space if restricted, please choose multifunctional solenoid valve because it eliminates the manual bypass and third valve and easy online maintenance.

4. power supply conditions

4.1 types according to the power supply were selected AC and DC solenoid valve. In general the AC power convenience.
4.2 voltage specifications used as preferred AC220V.DC24V.
4.3 power supply voltage fluctuation usually AC selection +% 10% 15%,-DC allow ±% 10% if the variance-stabilizing measures shall be taken or made a special order requirements.
4.4 should be based on the power capacity options rated current and power consumption. It should be noted that Exchange starting VA value higher, the capacity is low priority selection indirectly imported type solenoid valve.

5. Control accuracy

5.1 General electromagnetic valve only on, off two locations that require high precision in control and parameter requirements when you use many stationary solenoid valve;
5.2 action time: refers to the electrical signal is switched on or off to main valve action completion time, only the company's patented product multifunctional solenoid valve to open and close times are adjusted, not only can meet the control accuracy requirements, also prevents water hammer.
5.3 leakage: sample given leakage value for common economic class, if too high, for special orders.

3. reliability: unreliable will damage the entire system!

1, working life, this is not included in the test project, a type test project. To ensure the quality of the formal election should manufacturers of brand-name products.
2. working mode: long-term, repeated short-time working and short-time working. The company's conventional products are long-term working system, i.e. coils allow long-term power.
3. working frequency: high frequency requirements, the structure should be optimized direct-acting solenoid valve, the power to listen to the optimization of the Exchange.
4. reliability

Strictly speaking this test has not been formally included in the professional standards in our electromagnetic valve, to ensure the quality of the formal election should manufacturers of brand-name products. Some situations or environments, the action of times, but on very high reliability requirements, such as fire and emergency protection, lightly. It is particularly important, but should also take two with double insurance.

4. economy: the economy is on the money, energy and the waste of life

One measure of its choice, but must be in a safe, suitable and reliable basis for the economy.
Economics is not only the price of products, but also to give priority to their function and quality as well as installation and maintenance and other costs required for the annex.

More importantly, a solenoid valve in the entire automatic control system throughout the entire automatic control system and the production line in the cost is minimal, and if you covet xiaobianyi cuoxuan early damage is enormous.