From the point of view of cost performance, if there is no corrosive medium, it is not necessary to use anti-corrosion solenoid valve. The technology of ordinary fluid solenoid valve is now very mature, and there are many manufacturers. It can be said that the water solenoid valve is used as long as there is no special requirement. The quality of the price can be affordable.
From the point of view of cost performance, if there is no corrosive medium, it is not necessary to use anti-corrosion solenoid valve. The technology of ordinary fluid solenoid valve is now very mature, and there are many manufacturers. It can be said that the water solenoid valve is used as long as there is no special requirement. The quality of the price can be affordable.
From a safety point of view, the working pressure of excessive pressure (more than 1.0Mpa) can not be used as anti-corrosion plastic solenoid valve, because the manufacturing materials of anti-corrosion plastic solenoid valve are mostly made of plastic material, and the anti-corrosion electromagnetic valve has anti-corrosion performance. Metals that cannot withstand metals, such as concentrated hydrochloric acid, strong acid and alkali, even stainless steel "target=_blank> stainless steel 316 can not use the medium. As we all know, the plastic withstand voltage is limited, the normal pressure range is below 0 ~ 1.0Mpa.
There are thousands of chemicals in the world, no one can understand the performance of all chemicals, so the selection of anti-corrosion solenoid valves mainly used for chemicals is very important. For known substances, you can rely on the former. People's experience to judge, for the unknown substances, we can only learn from the actual use, Tai Ming market is positioned in anti-corrosion valves, painstaking research and development for many years, a large number of practical use cases, experience - let us calmly face the consultation of different customers. Our confidence comes from the affirmation of customers for more than 10 years.
Anti-corrosion solenoid valve includes: ABS solenoid valve, PVC solenoid valve, PP solenoid valve, UPVC solenoid valve, CPVC solenoid valve, PTFE solenoid valve attached: solenoid valve selection and installation characteristics 1. Safety:
1, strong acid and alkali strong corrosive medium must use the corresponding anti-corrosion solenoid valve, generally made of plastic (including ABS, PVC, PP, UPVC, CPVC, PTFE, PVDF), of course, weak acid and alkaline medium can also choose all stainless steel" target =_blank>Stainless steel, such as organic solvents (remember to be all stainless steel) target=_blank>stainless steel, organic solvents will corrode rubber).
2. The nominal pressure of the solenoid valve should be greater than the maximum working pressure of the medium in the pipeline.
3, flammable and explosive environment must use the corresponding explosion-proof level solenoid valve, open-air rainwater installation should take into account the waterproof and anti-UV radiation aging, dust should be considered in dusty occasions. Referred to as the explosion-proof solenoid valve, waterproof solenoid valve, dust-proof solenoid valve.
Second, applicability:
1. Different types of solenoid valves should be selected for the gaseous, liquid or gas-liquid mixed state. The targeted selection will never be wrong.
2, the medium temperature is different, choose different materials, and should choose the solenoid valve within the allowable range of the material, whether the valve body is easy to damage, the coil is easy to burn, the seal is easy to aging and deformation, seriously affecting the service life of the solenoid valve.
3. The viscosity of the medium is usually below 50 cSt. If this value is exceeded, it must be noted and usually requires special order.
4. The filter should be installed in front of the solenoid valve when the fluid is not clean or contains impurities.
5, solenoid valve is also called check valve medium is not allowed to reverse flow should be one-way circulation, if there is a back pressure difference should be installed check valve. If two-way circulation is required, it is best to use other suitable control valves.
6, the minimum working pressure difference of 0.02Mpa or less than zero must use direct-acting or step-by-step direct, the minimum working pressure difference of 0.04Mpa or more is the use of indirect pilot type;
7, according to the type of power supply, voltage specifications should be preferred to use AC220V, DC24V, that is convenient to use.
8. The fluctuation of the power supply voltage is generally allowed to be ±%10. If there is too much difference, the voltage regulation measures must be taken. This is only the standard of the domestic coil, and the requirements for the imported coil may be higher.
9. The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the VA value is higher when the AC starts, and the low-power solenoid valve should be preferred when the power supply capacity is insufficient.
10, the general solenoid valve only open and close two positions, the control accuracy requirements are too high and need to adjust the flow should be carefully considered in use.
11. The operating time of the solenoid valve is generally faster, a few milliseconds faster, and less than one second slow. It should be considered whether a water hammer is generated in the pipeline.
12. The amount of leakage is O is the dream of most manufacturers, but there are always unsatisfactory practical applications, so it is necessary to fully consider whether this will have a serious impact on production.
Third, reliability:
1. Regarding the service life of the solenoid valve, the service life is completely different under different working conditions. The solenoid valve, which is said to be used millions of times, may not be used in a harsh environment, so the user before purchase and The full communication of the producer is indispensable. The regular manufacturer has a one-year warranty period, and the manufacturer will give repair or replacement of the quality problem during the warranty period.
2. Solenoid valves generally have long-term energization work or short-time energization. Normally closed solenoid valves are used more. For long-time solenoid valves that need to be open for a short time to close, normally open solenoid valves should be used. In some special protective situations, that is, when the power is turned off, the normally closed solenoid valve must be used.
3. When the operating frequency is relatively high, the direct-acting solenoid valve should be preferred. When the pressure is relatively high, the pilot-piston solenoid valve should be used.
Fourth, economic:
Many users will consider the cost, and the benefits are the ideal choice based on safety, application and reliability.
Five, installation notes:
1. The solenoid valve should be thoroughly cleaned before installation. The medium to be passed should be free of impurities. Install the filter in front of the impurity valve.
2. The solenoid valve should ensure normal operation within the fluctuation range of ±10% of the rated voltage.
3. When installing, please pay attention to the arrow on the valve body should be consistent with the flow direction of the medium. There should be no reverse pressure difference in the pipe installed by the solenoid valve, otherwise the check valve should be installed.
4, the solenoid valve must not be installed in the place where there is direct dripping or splashing water, otherwise the solenoid valve coil may burn or easily corrode the valve surface.
5. In order to ensure the normal and continuous operation of the pipeline system, a bypass device should be installed to prevent the loss of the solenoid valve when it fails or needs to be cleaned.
6, the solenoid valve is best to install horizontal piping, such as the need for vertical piping installation should be a special requirement, manufacturers can generally order.
7. After the installation is completed, the test machine should be powered on several times. After the operation is normal, it can be put into use.
Sixth, the use and characteristics of the fluid solenoid valve The fluid solenoid valve is used for the switching control of liquid and gas pipelines. It is a two-position control and can only be used as a switch. Generally used in small pipeline systems, common in DN50 and below pipelines. When the pipeline is relatively large, other types of valves are often selected, such as electric or pneumatic valves, but it can be automatically turned on and off when power is turned off and automatically turned off when power is lost. The valve is unmatched.
The solenoid valve generates magnetic force as a driving force when the coil is energized. It can only be turned on or off. Changing the placement mode of the return spring can be divided into normally closed or normally open type. The energization is normally closed, and the power is turned off. open.
Seven, failure and elimination
1. Solenoid valve does not work after power-on (1) Check if the power supply wiring is bad → Re-wiring and connector connection (2) Check if the power supply voltage is in the working range - → Adjust the normal position range (3) Whether the coil is off-welded → Re- Welding (4) Coil short circuit → Replace coil (5) Working pressure difference is not suitable → Adjust pressure difference or replace suitable solenoid valve (6) Fluid temperature is too high → Replace suitable solenoid valve (7) Frequency is too high and life has been To → replace the solenoid valve (8) the viscosity of the liquid is too large → replace the appropriate solenoid valve (9) with impurities so that the main valve core and the moving iron core of the solenoid valve are stuck → clean, if there is seal damage, replace the seal and install the filter Device
2, the solenoid valve can not be closed (1) the spring life has reached or deformed → replace (2) throttle hole balance hole blockage → timely cleaning (3) there are impurities into the solenoid valve valve core or moving iron core → cleaning (4) Whether the fluid temperature and viscosity are too high → Replace the solenoid valve of the opposite port (5) The seal of the main spool or moving iron core is damaged → Replace the seal (6) The working frequency is too high or the life is up → Re-select the product or update the product
3. Leakage in other cases → Check if the seal is damaged, whether the spring is poorly assembled, or if the seal is loose or the seal is broken. → If there is noise when tightening the screw or replacing the seal, the solid part is loose and tightened. Voltage fluctuations are not within the allowable range and the voltage is adjusted to the normal range. The iron core suction surface is dirty or uneven, and it is cleaned or replaced in time.
The article by the solenoid valve: http:// Tan finishing release http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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