A, safety:

1, corrosive medium: appropriate chooses king electromagnetic valve and the plastic stainless steel; For a strong corrosive medium to must choose isolated patch type. An example CD-f. Z3CF. Neutral medium, also should be chosen for the copper alloy material shell electromagnetic valve, otherwise, the shell has a tendency to rust flocks fall off, especially action not frequent occasions. Ammonia use valve has cannot use the copper. 

2, an explosive environment: must choose corresponding explosive-proof grade products, outdoor installation or dust many occasions should choose waterproof, dustproof varieties. 

3, electromagnetic valve should exceed the highest nominal pressure pipe work pressure. 

Second, applicability:

1. The media properties

1.1 qualitative gas, liquid or mixed state are chosen different kinds of electromagnetic valve, an example ZQDF for air, ZQDF-Y used for liquid, ZQDF-2 (or-3) used for steam, otherwise easy cause false action. ZDF series solenoid valves can be all multi-functional in gas. Liquid. The best order against the state media, installation users won't have to mode.

1.2 medium temperature different specifications products, or coil will burn, sealers aging, the serious influence life life. 

1.3 medium viscosity, usually in 50 cSt below. If more than this value, size with more than 15 mm ZDF series solenoid valves for multifunctional special order. Size less than 15 mm order high viscosity solenoid valves. 

1.4 medium high cleanness not should be in the electromagnetic valve with before recoiling filter valve, pressure can choose low straight moving electromagnetic valve diaphragm type for such as CD-P. 

1.5 if directional circulation medium, and not allowed to go back and ZQDF ZDF-N-N single need two-way circulation, please make special requirements.

 1.6 the temperature of the medium in electromagnetic valve rappel/abseil stations should be permissible. 

2. Pipe parameters

2.1 the flow direction of medium according to requirements and pipe connection way to choose and model number of the valve. For example, for a pipeline to two pipe switch, smaller size of choose and Z3F CA5, medium or drift diameter please choose ZDF-Z1/2. And as control two pipe vectors of, please choose ZDF-Z2/1, etc. 

2.2 according to flow and valve Kv value selected nominal diameter, also can choose pipe diameter with. Please note the electromagnetic valveMeaning some manufacturer not marked Kv value, often valve size hole diameter less than interface, must not covet price low and delaying. 

2.3 minimum differential pressure differential pressure in 0.04 Mpa above is can choose indirect pilot type; Minimum differential pressure close to or less than zero to must choose e-style or by direct type. 

3. Environmental conditions

3.1 the highest and lowest temperature environment rappel/abseil stations should be permissible, if have the poor to be put forward a special order. 

3.2 high relative humidity in the environment and water droplets rain and so on, should choose waterproof solenoid valves

3.3 in the environment often vibration, turbulence and impact and so on elected special varieties, such as Marine solenoid valves. 

3.4 in corrosive or explosive environment should be priority according to the use of safety requirements choose corrosion resistance of hair3.5 environmental space if restricted, please choose multi-function electromagnetic valve, because its tell the bypass and SanZhiShou move valve and is easy to on-line maintenance. 

4. The power supply conditions

4. 1 according to power supply power types, are chosen exchanges and dc electromagnetic valve. In general ac power take with convenient. 

4.2 voltage specification as far as possible with priority AC220V selection. DC24V. 

4.3 the power supply voltage fluctuation usually exchange choose + % 10%.-15%, dc allow ± % 10 or so, if the difference, need to take measures put forward voltage or special order requirements. 

4.4 should be based on the power capacity rated current choice and power consumption. Must pay attention to exchange starting VA value is higher, in the capacity is insufficient should first choose indirect guide type solenoid valves. 

5. Control precision

5.1 ordinary solenoid valves open and close only two position, in high control accuracy requirement and parameters requirements when more than please choose to smooth electromagnetic valve; Z3CF three to often open electromagnetic valve, with tiny qi, the full open and shut down three flow; ZDF-Z1/1 combination multi-function electromagnetic valve fully open, open, with small open, full open four flow. 

5.2 the action time: refers to electrical signals connected or cut off the main valve to finish time, only the company patent product multi-function of electromagnetic valve opening and closing time, regulate, not only can meet the control accuracy requirement, still can prevent water hammer damage. 

5.3 leakage on the samples are leakage for commonly used numerical economic level, if disrelish on the high side, please make a special order. 

Three, reliability:

1, working life, this is not included in the factory test project, belongs to the type testing project. Rappel/abseil stations should be to ensure that the quality of normal manufacturer brand products. 

2, work formats: points long-term work week, repeated short-term operated and short-term operated three. The company conventional products all are long-term work week, namely coil allow long-term electricity work. For long time valve opened only short-term closed case, appropriate chooses to often open solenoid valves. Used in short-term operated and batch and is very big, can make a special order to reduce power consumption. 

3, working frequency: action requires high frequency, structure should be preferred e-style electromagnetic valve, the power to optimizing exchange. 

4, operating reliabilityStrictly speaking the experiment has not officially listed in China electromagnetic valve professional standards, to ensure the quality of normal manufacturer rappel/abseil stations should be famous brand products. Some occasions times action is not much, but for reliability requirements but very, such as fire and emergency protection, cannot be overemphasized. Especially important, should also take two double insurance act.

 Four, economic:It choose one of the scale, but must be in the security, application and reliable on the basis of the economy. Economy is not only selling price of the product, more to be preferred its function and quality and installation and maintenance and other accessories have need expenses. More important, a solenoid valves in the automatic control system of the automatic control system in the production line and take little cost, if covet petty gain is wrong and cause damage to the group of choose is huge.

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