1. Security: 1. Corrosion medium: plastic solenoid valve and all stainless steel should be selected; For highly corrosive media, isolation diaphragm type must be selected. For example, CD-F. Z3CF is the neutral medium, and it is also advisable to use copper alloy as the valve housing material for the solenoid valve, otherwise rust will often fall off in the valve housing, especially when the action is not frequent. Ammonia valves cannot be made of copper. 2. Explosive environment: products with corresponding explosion-proof grade must be selected, and waterproof and dustproof varieties should be selected for outdoor installation or dusty occasions. 3. The nominal pressure of the solenoid valve shall exceed the maximum working pressure in the pipeline. 2. Applicability: 1. Medium characteristics: 1. 1. Choose different kinds of solenoid valves for gas, liquid or mixed state, such as ZQDF for air, ZQDF-Y for liquid and ZQDF-2 (or -3) for steam, otherwise it will easily cause misoperation. ZDF series multifunctional solenoid valves can communicate gas and liquid. It is best to inform the state of the media at an appropriate time, so that the installation user does not have to adjust the mode. 1.2 products with different medium temperatures, otherwise, the coil will be burnt out, the seal will be aging, and the service life will be seriously affected. The viscosity of 1.3 medium is usually below 50cSt. If it exceeds this value and the diameter is greater than 15mm, ZDF series multi-function solenoid valves are specially ordered. Order high viscosity solenoid valve with diameter less than15 mm. 1.4 when the cleanliness of the medium is not high, a backwashing filter valve should be installed in front of the solenoid valve. For example, when the pressure is low, the direct-acting diaphragm solenoid valve can be used as CD-P. If the medium of 1.5 is directional circulation, and reverse flow is not allowed, ZDF-N and ZQDF-N only need bidirectional circulation, please make special requirements. 1.6 the medium temperature should be selected within the allowable range of the solenoid valve. 2. Pipeline parameters 2. 1 Select the valve port and model according to the requirements of medium flow direction and pipeline connection mode. For example, when switching from one pipeline to two pipelines, CA5 and Z3F are selected for small diameter, and ZDF-Z 1/2 is selected for medium diameter or large diameter. Another example is to control the confluence of two pipelines, please choose ZDF-Z2/ 1 and so on. 2.2 according to the flow rate and valve Kv value, the nominal diameter can be selected, or it can be the same as the inner diameter of the pipeline. Please note that some manufacturers have not marked the Kv value, and the size of the valve hole is often smaller than the pipe diameter of the interface. Do not delay the work for low price. 2.3 The minimum working pressure difference is above 0.04Mpa, and the indirect pilot type can be selected; If the minimum working pressure difference is close to or less than zero, direct-acting or step-by-step direct-acting must be selected. 3. Environmental conditions 3. 1 The maximum and minimum temperature of the environment should be selected within the allowable range, and special orders should be made if there is any deviation. 3.2 When the relative humidity of the environment is high and there is dripping water and rain, a waterproof solenoid valve should be selected. 3.3 In situations where vibration, bumps and impacts often occur in the environment, special varieties, such as marine electromagnetic valves, should be selected. 3.4 When used in corrosive or explosive environment, priority should be given to corrosion resistance according to safety requirements. 3.5 If the environmental space is limited, please choose the multi-function solenoid valve, because it saves the bypass and three manual valves, which is convenient for online maintenance. 4. Power supply conditions 4. 1 According to the type of power supply, AC and DC solenoid valves are selected respectively. Generally speaking, AC power supply is easier to access. 4.2 AC 220 volts. DC24V is preferred as far as possible for voltage specification. 4.3 AC voltage fluctuation is usually +% 10%. -15%, and the DC voltage is allowed to be around +/- 10. In case of out-of-tolerance, voltage stabilizing measures should be taken or special ordering requirements should be put forward. 4.4 The rated current and power consumption should be selected according to the power supply capacity. Attention should be paid to high VA value when AC starts, and indirect solenoid valve should be preferred when capacity is insufficient. 5. The control accuracy is 5. 1. Ordinary solenoid valves have only two positions: on and off. When the control precision is high and the parameters are stable, please choose a multi-position solenoid valve. Z3CF three-position normally open solenoid valve, with three flows: slightly open, fully open and fully closed; ZDF-Z11The combined multi-function solenoid valve has four flows: full open, large open, small open and full open. 5.2 Action time: refers to the time from the turn-on or turn-off of the electrical signal to the completion of the main valve action. Only the multifunctional solenoid valve patented by our company can adjust the opening and closing time respectively, which can not only meet the requirements of control accuracy, but also prevent water hammer damage. 5.3 The leakage value given on the leakage sample is a common economic grade. If the price is too high, please make a special order. Three. Reliability: 1. Work and life. This project is not included in the factory test project, but belongs to the type test project. In order to ensure the quality, we should choose the famous brand products of regular manufacturers. 2. Working system: There are three types of working system: long-term working system, repeated short-term working system and short-term working system. The conventional products of our company are all long-time working system, that is, the coil is allowed to work live for a long time. When the valve is open for a long time and closed only for a short time, the normally open solenoid valve should be selected. It can be used as a special order to reduce power consumption when it is used in short-term working system and large batch. 3. Working frequency: When the working frequency is required to be high, the direct-acting solenoid valve should be the first choice in structure, and the AC power supply should be the first choice. 4. Action reliability Strictly speaking, this test has not been officially included in the professional standard of solenoid valves in China. In order to ensure the quality, we should choose the famous brand products of regular manufacturers. On some occasions, there are not many actions, but the reliability is high, such as fire fighting and emergency protection, which must not be taken lightly. Above all, you should also bring two pairs of insurance. 4. Economy: This is one of the selection criteria, but it must be based on safety, applicability and reliability. Economy is not only the price of the product, but also the function and quality of the product and the cost of installation, maintenance and other accessories. More importantly, the cost of a solenoid valve in the whole automatic control system, in the whole automatic control system and even in the production line is very small. If you are greedy for small and cheap, the harm group caused by wrong selection is huge. Installation precautions are as follows: 1. During installation, it should be noted that the arrow on the valve body should be consistent with the flow direction of the medium. Do not install it where there is direct dripping or splashing water. The solenoid valve should be installed vertically upward. 2. The solenoid valve shall ensure that the power supply voltage is within the fluctuation range of 15%- 10% of the rated voltage. 3. After the solenoid valve is installed, there should be no reverse pressure difference in the pipeline. It needs to be electrified many times to make it hot before it can be put into use. 4, solenoid valve should be thoroughly cleaned before installation. The medium to be introduced should contain no impurities. The filter is installed in front of the valve. 5, when the solenoid valve failure or cleaning, in order to ensure the system continues to run, should install a bypass device.
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