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Analysis of the four major properties of solenoid valves have these

First, the safety of the solenoid valve:
1. Corrosive medium: The plastic king electromagnetic valve and all stainless steel should be used; For the strongly corrosive medium, the diaphragm type must be selected. Example CD-F.Z3CF. Neutral medium, it is also advisable to use steel alloy valve shell material for the solenoid valve, otherwise, the valve shell is often rust off, especially infrequent occasions. Ammonia valves cannot use copper.
2. Explosive environment: The corresponding explosion-proof grades must be selected. Waterproof and dustproof types should be selected for open-air installation or dusty occasions.
3. The nominal pressure of the solenoid valve should exceed the maximum working pressure in the pipe.

Second, the applicability of the solenoid valve:
1, medium characteristics ? 1, 1 gas, liquid or mixed state, respectively, choose a different solenoid valve, example ZQDF for air, ZQDF-Y for liquid, ZQDF-2 (or -3) for steam, or easy Caused by mistake. ZDF series multi-function solenoid valve can be connected to gas and liquid. It is best to state the media status at the time of subscription, and it is not necessary to install the user.
1, 2 medium temperature products with different specifications, otherwise the coil will burn, aging seals, seriously affecting the life of life. ? 1, 3 medium viscosity, usually below 50cSt. If it exceeds this value, the diameter is larger than 15mm and ZDF series multi-function solenoid valve is used for special orders. Path is less than 15mm high viscosity solenoid valve.
When the cleanliness of mediums 1 and 4 is not high, the recoil filter valve should be equipped in front of the solenoid valve. In the case of low pressure, a direct-acting diaphragm type solenoid valve can be used as a CD-P.
If the 1 and 5 mediums are directional and do not allow reverse flow, ZDF-N and ZQDF-N are required to use two-way flow, please make special requirements.
1, 6 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 medium flow requirements and the pipe connection method. For example, for a switch from one pipe to two pipes, select CA5 and Z3F for small paths, and select ZDF-Z1/2 for medium or large paths. Another example is to control the convergence of two pipes, please choose ZDF-Z2/1 and so on.
2, 2 According to the flow and valve Kv value selected nominal diameter, but also optional pipe diameter. Please note that some manufacturers are not marked with Kv value, often the size of the valve hole is smaller than the interface diameter, must not be coveted and the price is low.
2, 3 working pressure difference Minimum working pressure difference is above 0,04 Mpa can choose to use indirect pilot; minimum operating pressure difference is close to or less than zero must use direct-acting or step-by-step direct type.
3, environmental conditions
3,1 The maximum and minimum temperature of the environment should be selected within the allowable range. If there is any excess error, special ordering is required.
3, 2 high relative humidity in the environment and there are occasions such as water and rain, should choose the waterproof solenoid valve
3, 3 Environments often have vibrations, bumps, impacts and other occasions should be selected special varieties, such as marine electromagnetic valve.
3,4 In the use of corrosive or explosive environment, priority should be given to the use of corrosion resistance according to safety requirements
3, 5 If the environmental space is limited, please use multi-function solenoid valve, because it eliminates the bypass and three manual valves and easy online maintenance.
4, power conditions
4, 1 According to the type of power supply, choose AC and DC solenoid valves. In general, AC power is easy to use.
4,2 voltage specifications use AC220V, DC24V as much as possible.
4, 3 power supply voltage fluctuations are usually selected +% 10%, -15% AC, DC allows ±% 10 or so, if the poor, you must take the regulator or make special orders.
4, 4 should be based on the power capacity to select the rated current and power consumption. It should be noted that the value of VA is higher when the AC is started, and the indirect-conducting solenoid valve should be preferred when the capacity is insufficient.
5, control accuracy
5, 1 Ordinary solenoid valve only open, close two positions, in the control of high precision and stable parameter requirements, please use a number of electromagnetic valve; Z3CF three normally open solenoid valve, with micro-open, fully open and close the three kinds of flow ZDF-Z1/1 combination multi-function solenoid valve has full open, wide open, small open, fully open four kinds of flow.
5, 2 action time: refers to the electrical signal is turned on or off to the completion of the main valve action time, only the company's patented product multi-function solenoid valve can be adjusted on the opening and closing time, not only to meet the control accuracy requirements, but also to prevent water hammer damage.
5,3 Leakage The leakage value given on the sample is a common economic grade. If it is too high, please make a special order.

Third, the reliability of the solenoid valve:
1. Work life: This item is not included in the factory test project and it is a type test project. In order to ensure the quality should be selected from the regular manufacturers of brand-name products.
2, the work system: a long-term work system, repeated short-term work and short-term work of three. The company's conventional products are long-term work systems, that is, coils allow long-term power work. For long-term valve opening only short-term closure, you should use normally open solenoid valve. When used in a short-time work system and in large quantities, special orders can be made to reduce power consumption.
3. Operating frequency: When the operating frequency is high, the structure should be direct-acting solenoid valve, and the power supply should listen to the preferred communication.
4. Operational Reliability This test has not been formally included in China's professional standards for solenoid valves. In order to ensure the quality of this test, it is recommended to select the brand-name products of regular manufacturers. In some cases, the number of operations is not large, but the reliability requirements are very high, such as fire protection, emergency protection, etc., must not be taken lightly. Of particular importance, it should also take two consecutive double insurance.

Fourth, the economics of solenoid valve:
Non-economy is one of the criteria for the selection of funds, energy, and even the waste of life. However, it must be based on safety, application, and reliability. Economics and economics are not only the selling prices of products, but also priority should be given to their function and quality. As well as the cost of installation, maintenance and other accessories, and more importantly, the cost of a solenoid valve in the entire automatic control system in the entire automatic control system and even the production line is minimal. huge.
In short, economics not only refers to the price of a product, but the ratio of the price of a product to the price of a comprehensive product.

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