Common sense of solenoid valve selection

Common sense of solenoid valve selection
Applicability The fluid in the piping must be the same as the medium calibrated in the selected solenoid valve series.
The temperature of the helium fluid must be less than the calibration temperature of the solenoid valve selected.
â—‡Solenoid valves allow liquid viscosity to be generally below 20 CST, greater than 20 CST should be noted.
â—‡ Working pressure difference, when the high pressure difference of the pipe zui is less than 0.04MPa, the direct acting and distributed direct acting such as ZS, 2W, ZQDF, ZCM series, etc. should be selected; when the low pressure difference of Zui is greater than 0.04MPa, the pilot type can be used (pressure differential type) ) Solenoid valve; Zui high working pressure difference should be less than the large calibration pressure of the solenoid valve; general solenoid valves are one-way work, so pay attention to whether there is a back pressure difference, if there is a check valve installed.
When the fluid cleanliness is not high, the filter should be installed in front of the solenoid valve. Generally, the solenoid valve requires high cleanliness of the medium.
â—‡ Pay attention to the flow aperture and the nozzle diameter; the solenoid valve is generally only controlled by the two-position switch; the condition is allowed to install the bypass tube for easy maintenance; when there is water hammer, the opening and closing time adjustment of the solenoid valve should be customized.
â—‡ Pay attention to the influence of ambient temperature on the solenoid valve.
◇The power supply current and power consumption should be selected according to the output capacity. The power supply voltage is generally allowed to be ±10%. It must be noted that the VA value is higher at AC startup.

Reliability â—‡ Solenoid valves are divided into two types: normally closed and normally open. Generally, the normally closed type is used. The power is turned on and the power is turned off. However, when the opening time is very long and the closing time is short, the normally open type is selected.
â—‡ Life test, the factory is generally a type test project, to be exact, there is no professional standard for solenoid valves in China, so it is prudent to use solenoid valve manufacturers.
The action time is very short. When the frequency is high, the direct motion type is generally selected, and the large diameter is selected as the fast series.

Safety â—‡ General solenoid valves are not waterproof. Please use waterproof type when conditions are not allowed. Manufacturers can make them.
zuThe solenoid valve's high calibration nominal pressure must exceed the high pressure of the zui in the pipeline, otherwise the service life will be shortened or other unexpected situations will occur.
All stainless steel type should be used for corrosive liquid, and plastic king (SLF) solenoid valve should be used for strong corrosive fluid.
â—‡ Explosive environment must use the corresponding explosion-proof products.

Economical â—‡ There are many solenoid valves that can be used universally, but the products of Zui Economy should be selected on the basis of meeting the above three points.

The structural principle of the solenoid valve The direct-acting solenoid valve has two types: normally closed type and normally open type. When the normally closed type is powered off, it is in a closed state. When the coil is energized, an electromagnetic force is generated, so that the moving iron core overcomes the spring force and directly opens the valve with the static iron core, and the medium is in a path; when the coil is de-energized, the electromagnetic force disappears, and the moving iron disappears. The core is reset by the force of the spring force, and the valve is directly closed, and the medium is blocked. The structure is simple, the action is reliable, and it works normally under zero pressure difference and micro vacuum. The normally open type is just the opposite. For example, a solenoid valve that is smaller than the DN6 flow path.
Step-by-step direct-acting solenoid valve The valve is connected in one opening and two-opening. The main valve and the pilot valve step by step to directly open the main valve port with electromagnetic force and pressure difference. When the coil is energized, an electromagnetic force is generated to cause the pressure of the movable iron core and the upper chamber of the main valve to be unloaded through the pilot valve port, and the main spool is moved upward under the action of the pressure difference and the electromagnetic force to open the main valve medium circulation. When the coil is de-energized, the electromagnetic force disappears. At this time, the moving iron core closes the pilot valve hole under the action of its own weight and spring force. At this time, the medium enters the upper cavity of the main valve core in the balance hole, so that the pressure in the upper chamber rises. The main valve is closed under the action of spring return and pressure, and the medium is interrupted. The structure is reasonable, the action is reliable, and the work is reliable when the pressure is zero. Such as: ZQDF, ZS, 2W and so on.
Indirect Pilot Solenoid Valve This series of electromagnetic is made up of a combination of a pilot valve and a main spool. The normally closed type is closed when it is not energized. When the coil is energized, a magnetic force is generated to cause the moving iron core and the static iron core to be sucked, the pilot valve port is opened, and the medium flows toward the outlet. At this time, the pressure in the upper chamber of the main spool is reduced, lower than the pressure on the inlet side, forming a pressure difference against the spring. The resistance moves with it upwards, reaching the purpose of opening the main valve port and circulating the medium. When the coil is de-energized, the magnetic force disappears and the moving iron core moves downward under the action of the spring force to close the main valve port. The normally open principle is just the opposite. Such as ZCZ and so on.

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