Solenoid valve is commonly used in water, oil, steam, gas and other media cut off, its structure is simple, solenoid valve price is moderate, widely used. How to correctly select the solenoid valve in order to extend the service life of the solenoid valve and improve the reliability of the solenoid valve? This is not very clear to many users, electriciansand electricians to learn the combination of solenoid valve field applications to share the solenoid valve selection and use of experience to help maximize the life of the solenoid valve and improve the reliability of the solenoid valve.
1, understand the nature of the solenoid valve working fluid
The nature of the working fluid determines the type of solenoid valve, and therefore should be based on the characteristics of the medium to select the appropriate solenoid valve, such as water and steam for the solenoid valve is not the same. Fluid properties include: temperature, pressure, viscosity, corrosiveness, etc.; for high temperature fluid, you can not use room temperature solenoid valve, otherwise its service life will be greatly shortened, and in severe cases will even be damaged. When the pipeline fluid contains particles and other impurities, should be used diaphragm solenoid valve. Solenoid valve allows the liquid viscosity is generally below 20mm2/s, should check with the solenoid valve manufacturer, greater than 50mm2/s should be specially ordered. General solenoid valve on the fluid cleanliness requirements are high, fluid cleanliness is not high when the solenoid valve can be installed before the filter.
2, to clarify the solenoid valve working fluid pressure andflow rate
Selection of solenoid valve rated working pressure is too high, will increase the investment but the choice of rated working pressure is too low, or close to the actual medium pressure, in the work of the solenoid valve due to insufficient strength of the material, will cause accidents. In addition to safety issues, the choice of working pressure is also related to the solenoid valve can work properly. Working pressure is generally the highest and lowest upper and lower limits to determine its reliable working range. Otherwise, the solenoid valve by the media pressure will not work reliably.
Medium flow size is related to the selection of solenoid valve diameter or valve seat size. If the selected solenoid valve caliber is too large, it will cause economic waste, increase installation costs, but the caliber of the selected small problems, such as limiting the pipeline should be through the flow rate, and cause greater pressure loss makes the system's control role reduces the control accuracy of the system down or out of control.
Differential pressure refers to the solenoid valve can be reliably open and close the valve inlet and outlet pressure difference between the solenoid valve can work properly is the key to the selection of the primary consideration, according to the process piping conditions and other parameters, combined with the solenoid valve selection samples to choose.
3, choose a good solenoid valvepower supply
Solenoid valve power supplyDC and AC points, in the use of solenoid valves must pay attention to. Otherwise, DC solenoid valve access to the AC power supply, the electromagnetic suction is very small resulting in failure to work; if the AC solenoid valve access to the DC power supply, there will be too much current to the Ambassador coil temperature rises to the solenoid valve burned out.
Solenoid valve power supply should be consistent with the rated voltage on the nameplate, because the power supply voltage is too high, will make the solenoid valve current is too large and the temperature rise is abnormal, and the electromagnetic suction is too large resulting in excessive impact, which affects the reliability of the valve. If the supply voltage is too low, the solenoid valve electromagnetic suction drops too much, will affect the ability to open the valve, its difficult to work reliably.
4, according to the need to determine the working frequency of the solenoid valve
Working frequency that the solenoid valve is allowed to use the highest number of actions, usually with the number of times per minute to open and close the valve to indicate. By the type of solenoid valve and structure to determine, such as direct action solenoid valve action time is fast, it can be higher frequency.
Industrial production, continuous production, intermittent production, short-term production. Such as in continuous production occasions using a short-time working system of solenoid valves, its service life will be shortened, or even damaged in a short period of time. Therefore, in the selection of solenoid valves, should be based on the production, combined with the solenoid valve manufacturer's selection samples for reasonable selection. If there is no proper products to choose from, can only choose a higher gear of the product, and do not reduce the amount of use.
5, pay attention to solenoid valve application details
Many solenoid valves can be generalized, so in order to meet the requirements of the use of the basis, should choose the most economical products. General solenoid valve is not waterproof, so the installation environment should make the necessary choices. For corrosive media should be selected stainless steel products; solenoid valves are normally closed and normally open two types, normally closed type that is energized to open, power failure shutdown; and vice versa for the normally open type, according to the process requirements and safety to choose.
6, pay attention to the solenoid valve use of environmental conditions
To make the solenoid valve work reliably, its installation in the field of environmental conditions is also very important, such as: the maximum temperature can not exceed the solenoid valve shown on the nameplate, the solenoid valve is too high a temperature life will decline. Ambient temperature is too low, will cause the solenoid valve shell frost, will make the sealing packing and other problems, so that the solenoid valve can not work properly.
Relative humidity will affect the electrical insulation, humid environment will make the electrical insulation decline, affecting the reliability of the solenoid valve. Excessive humidity, at a certain air temperature, can easily cause mold and so on.
When the use environment has dust, water droplets, salt mist and corrosive atmosphere, their influence on the solenoid valve should be considered. Should choose a good sealing products, such as waterproof, splash-proof, dust-proof solenoid valve. Use the environment requires explosion-proof, should choose explosion-proof solenoid valve. In the vibration, shock environment should choose vibration-resistant solenoid valve. In addition to the correct choice of the above environment solenoid valve, should also take certain protective measures to protect the solenoid valve.