1. Corrosive media: the best choice is to use plastic and stainless steel solenoid valves; strong corrosive media for isolating diaphragm must be used. Neutral medium, but also should use copper solenoid valve, otherwise the valve shell debris often rust off, especially where the action is not frequent. Ammonia can not be used with copper valve.
2.explosive environments: the product must use the appropriate level of proof, open-air installation or dust should be used in many occasions, waterproof, dust-proof varieties.
3. solenoid valve should be more than Nominal maximum working pressure of the pipe.
Second, applicability:
1 medium properties
1.1 gas, liquid or mixed states, which use different varieties of solenoid valves, when told that the media provide the best state.
1.2 medium temperature products of different specifications of different options, otherwise the coil will burn, seals aging, seriously affect the life of life
1.3 medium viscosity, usually 50cSt below. If more than this value, select solenoid valve for large diameter special order, or set high viscosity valve.
1.4 media cleanliness is not high before the solenoid valve should be fitted with recoil filter valve, low pressure can be used direct-acting solenoid valve for diaphragm.
1.5 If the required two-way flow of media, please make a special request.
1.6 medium temperature should be chosen in the solenoid valve allows the range.
2. pipe flow parameters
2.1 requirements and according to media pipe connection valve openings and model selection.
2.2 In accordance with the selected flow rate and valve CV value DN, also available with pipe diameter.
2.3 Working pressure above the minimum working pressure is used in 0.04Mpa indirect Pilot; minimum working pressure must be close to or less than zero, or use direct-acting direct-type step.
3 environment
3.1 environmental conditions, the maximum and minimum temperature should be chosen within the allowable range, if tolerance to be made for special order.
3.2 environment with high relative humidity and rain water droplets and other occasions, water solenoid valve should be selected.
3.3 environment, constant vibrations, bumps and shock should be selected where special varieties, such as marine solenoid valve.
3.4 in a corrosive or explosive environments should be given priority in the use of selection according to security requirements.
3.5 If the restricted environment of space, please use the multi-function valve, because it eliminates the need for bypass and three manual valves and easy online maintenance.
4 power supply according to type of conditions
4.1, respectively, optional AC and DC solenoid valve. Generally speaking, easy access to AC power.
4.2 voltage specification with as preferred AC220V.DC24V.
4.3 AC power supply voltage fluctuations are usually selected +% 10% .- 15%, DC to allow ±% 10 or so, should the ultra-poor, regulators should take measures or make a special order request. 4.4 should be selected according to the rated power capacity of current and power consumption. VA should be noted that the exchange value of starting high, lack of capacity should be preferred in the indirect conduction-type solenoid valve.
5 control accuracy
5.1 ordinary solenoid valve control accuracy is only open and close two locations in the control of high precision and parameters for a smooth, please use a number of electromagnetic.
Third, the reliability of a working life, should be selected to ensure regular quality brand-name manufacturers.
2, the working standard: sub-system of long-term, repeated short-term and short-term work system work system three. The company's products are long-term conventional system, which allows long-term power coil work. For a long time only a short-term closure of the valve opening of the case, are advised to use normally open solenoid valve. Short-time work system used in large quantities when they can be used as a special order to reduce power consumption.
3, the operating frequency: high frequency requirements of the action, the structure should be optimized direct-acting solenoid valves, power options exchange. 4, operating reliability
Fourth, the economy:
It selects one of the scale, but must be safe, suitable, reliable, based on the economy
