What is a solenoid valve

by:Lianke Valve     2022-07-31
Solenoid valve is an industrial equipment controlled by electromagnetic, and it is an automatic basic component used to control fluid. It belongs to actuator and is not limited to hydraulic and pneumatic. There are many kinds of solenoid valves. Different solenoid valves play a role in different positions of the control system. The most commonly used ones are check valves, safety valves, directional control valves, speed control valves, etc. The following introduces some basic common sense of solenoid valve. 1. Safety: Disaster will occur if you do not pay attention to safety 1. Corrosive medium: plastic king solenoid valve and all stainless steel should be used; isolation diaphragm type must be used for strong corrosive medium. Example CD-F. Z3CF. For neutral medium, it is also advisable to use a solenoid valve with copper alloy as the valve casing material, otherwise, rust chips often fall off in the valve casing, especially in the occasions where the action is not frequent. Ammonia valves cannot be made of copper. 2. Explosive environment: products with corresponding explosion-proof grades must be selected, and waterproof and dust-proof varieties should be selected for outdoor installation or in dusty occasions. 3. The nominal pressure of the solenoid valve should exceed the maximum working pressure in the pipe. 2. Applicability: Inapplicable is equivalent to spending money on expensive materials, but also causing trouble , ZQDF-2 (or -3) is used for steam, otherwise it is easy to cause malfunction. ZDF series multi-function solenoid valve can be connected to gas and liquid. It is best to inform the state of the media when ordering, so that the installation user does not have to adjust the mode. 1.2 The medium temperature is different for products of different specifications, otherwise the coil will burn out, the seals will be aged, and the lifespan will be seriously affected. 1.3 Medium viscosity, usually below 50cSt. If it exceeds this value, the ZDF series multi-function solenoid valve should be used for special order if the diameter is larger than 15mm. The diameter is less than 15mm to order high viscosity solenoid valve. 1.4 When the cleanliness of the medium is not high, a recoil filter valve should be installed in front of the solenoid valve. When the pressure is low, a direct-acting diaphragm solenoid valve can be used, such as CD-P. 2. Pipeline parameters 2.1 Select the valve port and model according to the medium flow direction requirements and the pipeline connection method. For example, for switching from one pipe to two pipes, choose CA5 and Z3F for small diameters, and ZDF—Z1/2 for medium or large diameters. Another example is to control the confluence of two pipelines, please choose ZDF-Z2/1 and so on. 2.2 Select the nominal diameter according to the flow rate and Kv value of the valve, or the same as the inner diameter of the pipeline. Please note that some manufacturers do not mark the Kv value, and the valve hole size is often smaller than the interface pipe diameter. 3. Environmental conditions 3.1 The maximum and minimum temperature of the environment should be selected within the allowable range. If there is any excess, a special order should be made. 3.2 When the relative humidity in the environment is high and there are water droplets and rain, the waterproof solenoid valve should be selected. 3.3 There are often vibrations, bumps and shocks in the environment, and special varieties should be selected, such as marine solenoid valves. 3. Economy: Uneconomy is a waste of money, energy and even life. It is one of the criteria used, but it must be economical on the basis of safety, application and reliability. Economy is not only the price of the product, but also its function and quality, as well as the cost of installation, maintenance and other accessories. The solenoid valve is a step-by-step direct pilot solenoid valve, which can be divided into a normally closed solenoid valve and a normally open solenoid valve according to the different on and off states when the power is off. Normally closed solenoid valve, after the coil is energized, the armature first drives the auxiliary valve plug to lift up under the action of electromagnetic force, and the fluid on the main valve cup flows away through the auxiliary valve, reducing the pressure acting on the main valve cup. When the pressure on the valve cup is reduced to a certain value, the armature drives the main valve cup, and uses the pressure difference to open the main valve cup and the medium flows. After the coil is powered off, the electromagnetic force disappears, and the armature falls and resets due to its own weight. At the same time, depending on the medium pressure, the main and auxiliary valves can be tightly closed. Normally open solenoid valve, after the coil is energized, due to the suction effect, the moving iron core moves down, the auxiliary valve plug is pressed down, the auxiliary valve is closed, and the pressure in the main valve cup rises. When the pressure rises to a certain value, the main valve cup Due to the action of electromagnetic force, the moving iron core pushes the main valve cup down, presses the main valve seat, and the valve closes. When the coil is powered off, the electromagnetic suction force is zero, the auxiliary valve plug and moving iron core are lifted up due to the action of the spring, the auxiliary valve is opened, and the fluid on the main valve cup flows away through the auxiliary valve, reducing the effect on the main valve cup. When the pressure on the main valve cup is reduced to a certain value, the main valve cup is pushed up by the pressure difference, the main valve is opened, and the medium flows. How to introduce some functions of the solenoid valve and some basic common sense, do you have a further understanding of the solenoid valve?
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