1. Security: pay attention to security will lead to disaster
1. Corrosive media: should use plastic solenoid valve and all stainless steel solenoid valve; for the strong corrosive medium must be selected isolated diaphragm. Cases of CD-F. Z3CF. Neutral medium, it should use copper alloy for the valve shell materials, electromagnetic valve, otherwise the shell valves are often chip off rust, especially the movements infrequent occasions. Ammonia with the valve can not use copper.
2. Explosive environments: explosion-proof grade products must be selected accordingly, open-air installation or dust should be used more occasions, waterproof, dust-proof varieties.
3. Solenoid valve Nominal pressure shall not exceed the maximum working pressure of pipe.
2. Applicability: Not applicable fee equal to money to buy materials, but also trouble
1. Dielectric properties
1.1 The quality of gas, liquid or mixed state were selected to different kinds of electromagnetic valve cases ZQDF for air, ZQDF-Y for liquid, ZQDF-2 (or -3) for the steam, otherwise easily cause malfunction. ZDF Series multi-function solenoid valve may be common in the air. Liquids. The best set, went out the state media, install the user no longer modal.
1.2 Medium temperature products with different specifications, otherwise the coil will be burnt, seals aging, seriously affect the life of life.
1.3 medium viscosity, usually in the 50cSt below. If it exceeds this value, diameter greater than 15mm Series multi-function solenoid valve with ZDF to make a special order. Diameter of less than 15mm solenoid valve provides a high viscosity.
1.4 Cleanliness is not high when the media should be equipped with the electromagnetic valve before the filter backflushing valve, low pressure moving fashion can choose straight diaphragm solenoid valve, such as the CD-P.
1.5 If the directional flow of media, and are not allowed back ZDF-N and ZQDF-N alone. You need to use two-way flow, please make a special request.
1.6 Medium temperature should be chosen within the allowable range solenoid valve.
2. Pipeline Parameters
2.1 According to media flow requirements and pipe connection valve openings and model selection. For example, for a pipeline to the two channels to switch, the small diameter of the election CA5 and Z3F, medium or Chase Drive Please select ZDF-Z1 / 2. Another example is control of convergence of the two pipelines, please select ZDF-Z2 / 1 and so on.
2.2 In accordance with the value of the selected flow rate and valve Kv DN, but also optional with the pipe diameter. Please note that some manufacturers are not marked with the Kv value, often less than the interface valve hole size diameter, must not covet low price and makes a botch.
2.3 Working pressure above the minimum working pressure is available in the 0.04Mpa use indirect Pilot; minimum working pressure close to or less than zero must be selected direct-acting type or sub-step direct type.
3. Environmental conditions
3.1 environment, the maximum and minimum temperature should be chosen within the allowable range, if the need for ultra-poor special order made.
3.2 environment, relative humidity is high and there are water droplets and rain and so on, to be elected water solenoid valve.
3.3 environment, often have vibration, bumps and shocks should be elected special varieties such as occasion, such as marine solenoid valve.
3.4 in a corrosive or explosive environments should be given priority in the use of security requirements under the optional corrosion-resistant.
3.5 environmental space if limited, please use multi-function solenoid valve, because eliminating the need for a bypass and three manual valves, and easy online maintenance.
4. Power Supply Conditions
4.1 according to power supply types, were selected to AC and DC solenoid valves. Generally speaking, convenient access to AC power.
4.2 Voltage specification with the best preferred AC220V.DC24V.
4.3 AC power supply voltage fluctuations are usually chosen +% 10% .- 15%, DC to allow ±% 10 or so, should the ultra-poor, regulators should take measures or make special order requests.
4.4 The choice should be based on rated power capacity and consumption of power. VA should be noted that the value of the exchange-start high, inadequate capacity should be preferred in the indirect-guided electromagnetic valve.
5. Control accuracy
5.1 Common solenoid valve is only opened, closed two locations in the control of high precision and parameters for a smooth when you use a number of solenoid valves; Z3CF three normal open solenoid valve, with Enlight, fully open and close the three kinds of traffic; ZDF -Z1 / 1 combination of multi-function solenoid valve has a fully open, wide open, small open, open all four kinds of traffic.
5.2 Action Time: refers to connect or disconnect the electrical signal to the main valve movement completion time, it's patented multi-function solenoid valve can adjust the opening and closing time was not only to meet the control accuracy requirements, but also to prevent water hammer damage.
5.3 leakage leakage given the sample values for common economic level, if too high, please make a special order.
Third, reliability: not reliable, would undermine the entire system
1, working life, this is not included in the pilot project factory belonging to type pilot projects. In order to ensure quality, brand-name manufacturers should be regular elections.
2, the working standard: sub-system of long-term, repeated short-term work system and the three kinds of short-term work system. For a long time only a short-term closure of the valve opening of the case, are advised to use normal open solenoid valve. Short-term work system used in large quantities when they can be used as a special order to reduce power consumption.
3, the working frequency: Action frequency of requests is high, the structure should be preferred direct drive type solenoid valve, power exchange should be preferred.
4, operating reliability: Well, strictly speaking to the pilot solenoid valve has not yet formally included in our professional standards, to ensure the quality of the brand-name manufacturers should be regular elections. Some occasions the number of actions are not many, but very high reliability requirements, such as fire, emergency protection, must not be taken lightly. Particularly important, should be used in conjunction to take two pairs of insurance.
4. Economy: Not the economy is on the money, energy and even a waste of life
It is one of the chosen scale, but it must be in a safe, suitable and reliable based on the economy. Economy is not only the product price, but also to give priority to their functions and quality, as well as the installation and maintenance, and other accessories required for the cost. More importantly, a solenoid valve in the whole production line automatic control system, as well as the share of costs are minimal, if the election just for the sake of small cheap and wrong, the damage is enormous.
In short, the economy not just price, but rather from the product's performance and price the cost price for the comprehensive assessment.
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