Solenoid valve selection

Solenoid valve in different environments are not the same choice, the environmental conditions: action reliability Strictly speaking, this test has not been officially included in the professional standards of our solenoid valve, to ensure that the quality should be selected regular manufacturers brand-name products. In some occasions, the number of actions is not much, but the reliability requirements are very high, such as fire protection, emergency protection, must not be taken lightly. Particularly important, you should also take two double insurance. I. Economy: Ineconomy is a waste of capital, energy and even life. It is one of the criteria for its selection, but it must be based on a safe, applicable and reliable economy. Economy is not only the selling price of the product, but also the priority given to its function and quality as well as the cost of installing maintenance and other accessories. 2, more importantly, a solenoid valve in the entire automatic control system in the entire automatic control system and even the production line in the cost of negligible, if the attempt to cheaper and wrong early damage caused by the group is huge. (1), the environment of the highest and lowest temperature should be selected within the allowable range, if there is any need for special order made over. (2), the environment of high relative humidity and rain drops and other occasions, should be selected waterproof solenoid valve (3), the environment often have vibration, bump and impact occasions such as special varieties should be selected, such as marine electromagnetic valve. (4) In corrosive or explosive environment, the use of corrosion-resistant or explosive environment should give priority to the selection of corrosion-resistant (5), if the environmental space is limited, please use the multi-function solenoid valve, because it eliminates the bypass and the three hand Moving valve and easy on-line maintenance. Second, the applicability: Does not apply to spend money on waste, but also trouble! Would not it cost to buy sins? 1. Medium characteristics (1), the quality of gas, liquid or mixed state were selected different types of solenoid valves, for example, ZQDF for air, ZQDF-Y for liquid, ZQDF-2 (or -3) for steam, or easy Cause misoperation. ZDF series of multi-function solenoid valve is available in the gas. Liquid. The best time to state the media state, the installation users do not have to adjust. (2), the medium temperature of different specifications of the product, otherwise the coil will burn, aging seals, seriously affect the life of the life. (3) Medium viscosity, usually below 50cSt. If more than this value, diameter greater than 15mm with ZDF series of multi-function solenoid valve for special order. Path less than 15mm set high viscosity solenoid valve. (4) medium cleanliness should be equipped with a recoil filter valve in front of the solenoid valve, the pressure is low fashion can choose direct acting diaphragm solenoid valve for example CD-P. (5) If the medium is directional and does not allow backflow ZDF-N and ZQDF-N need to be used in both directions, please make special requirements. (6), the medium temperature should be selected within the allowable range of the solenoid valve. 2.Pipeline parameters (1), according to the flow direction of the media and pipeline connection options valve port and model. For example, the small diameter selection CA5 and Z3F for one pipe to two pipes, ZDF-Z1 / 2 for medium or large diameters. Another example is the control of the convergence of two pipelines, please choose ZDF-Z2 / 1. (2), according to the flow and the valve Kv value selected nominal diameter, but also choose the same 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 greedy price low and misleading. (3), the minimum working pressure differential working pressure above 0.04Mpa is optional indirect pilot; the minimum working pressure close to zero or less must be used direct or step-by-step direct type. 3. Power conditions (1), according to the type of power supply, were selected AC and DC solenoid valve. In general AC power access convenience. (2), the voltage specifications exhausted preferred AC220V.DC24V. (3) The fluctuation of power supply voltage is usually + 10% -15%, DC ± 10%. If it is out of tolerance, voltage regulation measures or special order requirements should be taken. (4), should be selected according to the power capacity of the rated current and power consumption. Should pay attention to AC starting VA value is higher, in the lack of capacity should be preferred indirect induction solenoid valve. 4. Control accuracy (1), ordinary solenoid valve only open and close two positions, in the control of high precision and stable parameter requirements, please use a number of solenoid valves; Z3CF three normally open solenoid valve with micro-Kai, fully open And close the three flow; (2) ZDF-Z1 / 1 combination of multi-function solenoid valve with full open, wide open, small open, full open four flow. (3) Operating 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 multi-function solenoid valve can be opened and closed separately adjusted not only to meet the control accuracy requirements, but also to prevent water Hammer damage. (4), the amount of leakage on the sample given the value of the commonly used economic level, if too high, please make a special order. Third, security: do not pay attention to security easily lead to disaster! Loss will be heavy! 1. Corrosive media: the choice of plastic valve solenoid valve and stainless steel; for the strong corrosion of the media must use isolation diaphragm. Example CD-F.Z3CF. Neutral medium, copper alloy should also be used as the valve material of the solenoid valve, otherwise, the valve shell often rust off, especially when the action is not frequent. Ammonia valves can not use copper. 2. Explosive environment: you must choose the appropriate level of explosion-proof products, open-air installation or dust should be more occasions use waterproof, dustproof varieties. 3. Solenoid valve nominal pressure should exceed the maximum working pressure tube. Reliability: Unreliable will damage the entire system! 4 .. working life, this item is not included in the factory test project, a type test project. In order to ensure the quality of regular manufacturers should be selected brand-name products.