Valve knowledge: Solenoid valve characteristics and utility interpretation of the principle of cast steel solenoid valve
1 quality gas, liquid or mixed state respectively choose different varieties of solenoid valve, such as ZQDF for air, ZQDF – Y for liquid, QDF – 2 (or -3) for steam, otherwise easy to cause misoperation.
ZDF series multifunctional solenoid valve can be all through the gas. Liquid.
Better set time to inform the state of the media, installation users do not need to adjust.
2 medium temperature products of different specifications, otherwise the coil will burn, seal aging, severe impact on life.
3 Medium viscosity, usually below 50cSt.
If more than this value, diameter greater than 15mm with ZDF series multifunctional solenoid valve for special orders.
Diameter less than 15mm set high viscosity solenoid valve.
4 When the cleanliness of the medium is not high, the backwash filter valve should be installed in front of the solenoid valve. When the pressure is low, direct acting diaphragm type solenoid valve can be used, for example, CD — P.
1.5 If the medium is directional and smooth, and the reverse flow is not allowed, ZDF — N and ZQDF — N single need to use two-way smooth, please make special requirements.
1.6 Medium temperature should be selected within the allowable range of the solenoid valve.
2. Pipeline parameters 1 According to the medium flow direction requirements and pipeline connection mode, select the valve opening and model.
For example, for switching from one pipe to two pipes, select CA5 and Z3F for small diameters, and ZDF — Z1/2 for medium or large diameters.
If you want to control the confluence of two pipes, select ZDF – Z2/1.
2 According to the flow rate and valve Kv value select the nominal diameter, also can choose the same pipe diameter.
Please note that some manufacturers do not mark the Kv value, often the valve hole size is less than the diameter of the interface pipe, must not covet low price and trouble.
3 Low working pressure difference working pressure difference above 0.04Mpa can choose indirect pilot type; The low working pressure difference is close to or less than zero must choose direct action or step direct type.
1. The higher and lower temperature of the environment should be selected within the agreed range. If there is an out-of-tolerance, special orders should be placed.
2 In the environment, the relative humidity is high and there are water droplets and rain, waterproof solenoid valve should be selected.
3 In the environment often vibration, turbulence and impact occasions should be selected special varieties, such as Marine solenoid valve.
4 In corrosive or sexual environment, corrosion resistance should be preferred according to safety requirements.
5 If the environment space is limited, please choose the multifunctional solenoid valve, because it eliminates the bypass and three manual valves and easy online maintenance.
1 Select AC and DC solenoid valves according to the type of power supply.
Generally speaking, AC power is easy to access.
2. AC220V.DC24V is preferred for voltage specifications.
3 Power supply voltage fluctuation usually AC choice +% 10%-15%, DC agreed to ¡À% 10% or so, if out of tolerance, must take voltage regulation measures or put forward special order requirements.
4 Select the rated current and power consumption according to the power supply capacity.
It is necessary to pay attention to the high VA value when AC starting, and the indirect pilot solenoid valve should be preferred when the capacity is insufficient.
5. Control accuracy 1 common solenoid valve only open, close two positions, in the control accuracy requirements of high and stable parameters, please choose a multi-digit solenoid valve; Z3CF three-position normally open solenoid valve, with micro open, fully open and closed three kinds of flow; ZDF – Z1/1 combination multifunctional solenoid valve with full open, large open, small open, full open four kinds of flow.
2 action time: refers to the electrical signal connected or blocked to the completion of the main valve action time, only the company’s patented multifunctional solenoid valve can be opened and closed time respectively adjustment, not only can meet the control accuracy requirements, but also can prevent water hammer damage.
Explain the principle of cast steel solenoid valve
Explain the principle of cast steel solenoid valve
The solenoid valve is a step action direct normally closed solenoid valve. After the coil is energized, the armature first drives the small valve to open, and the large valve opens under the effect of the formed media pressure difference and electromagnetic force. The coil is powered off, the armature component is reset, and the large and small valves are tightly closed by the medium pressure surface.
Normally open solenoid valve, after the coil is energized, armature moves down under the action of magnetic force, pushing the valve plug of auxiliary valve down until it is compressed with the valve seat of auxiliary valve, and the auxiliary valve is closed. Because the pressure difference between the upper and lower pressure of the valve cup of the main valve tends to be equal, the valve cup of the main valve is firmly sealed by magnetic force and self-pressure, and the valve is closed. The coil is powered off, the magnetic force is zero, the armature and auxiliary valve plug rise by the action of spring, auxiliary valve opens, the medium in the valve cup of the main valve flows away through the auxiliary valve, the pressure drops, the main valve valve cup rises upward by the effect of the pressure difference between the bottom and the bottom, the main valve opens, the valve opens.
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Post time: Jan-05-2023
