Industry new

Sludge special electromagnetic valve core material

The definition, classification and principle of electromagnetic valve iron core material
Solenoid core material is an automated basic element used to control fluids and is an actuator; it is not limited to hydraulic, pneumatic. Solenoid valve core material is used to control the direction of hydraulic flow. The plant's mechanical devices are generally controlled by hydraulic steel, so the solenoid valve core material is used.
Working principle: There are closed chambers in the core material of the electromagnetic valve. There are through holes in different positions. Each hole leads to a different oil pipe. The valve is in the middle of the cavity. There are two electromagnets on both sides. Which side of the magnet coil is? Which side the energized valve body will be attracted to, by controlling the movement of the valve body to block or leak out the different oil discharge holes, and the oil inlet hole is normally open, the hydraulic oil will enter different drain pipes and then pass through. The pressure of the oil pushes the piston of the oil, and the piston drives the piston rod, which moves the mechanical device. This controls the mechanical motion by controlling the electromagnet current.
Classification and principle
Domestic and foreign electromagnetic valve core materials are divided into three major categories (ie: direct-acting, step-by-step direct-acting, pilot-type), and the differences in the structure and material of the valve flap are different from the principle. There are six sub-categories (straight-acting diaphragm structure, step-weighted structure, pilot membrane structure, direct-acting piston structure, step-by-step direct-acting piston structure, and pilot piston structure).
1 Direct-acting solenoid valve core material
Principle: When the power is turned on, the electromagnetic coil generates an electromagnetic force to lift the closing member from the valve seat and the valve opens. When the power is turned off, the electromagnetic force disappears. The spring presses the closing member against the valve seat and the valve closes.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.
2 distributed direct-acting solenoid valve iron core material
Principle: It is a combination of direct acting and pilot type. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing part and the valve opens. When the inlet and outlet reach the starting differential pressure, after the power is turned on, the electromagnetic force leads the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber decreases, thereby pushing the main valve upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it downwards to close the valve.
Features: In the zero pressure difference or vacuum, high pressure can also be * action, but the power is relatively large, requires a horizontal installation.
3 pilot solenoid valve iron core material
Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the upper part is formed around the closing part. The fluid pressure pushes the closing part to move upwards and the valve opens; when the power is turned off, the spring force leads the pilot. The hole is closed and the inlet pressure quickly bypasses the chamber to form a lower, upper high pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve.
Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customization is required) but the fluid pressure difference must be met.
In use, it should consider some of its characteristics, such as media characteristics, ambient temperature, operating frequency, power supply and other factors
Solenoid valve core material with magnetic reasons
People often think that magnets absorb electromagnetic iron core material, verify its pros and cons and authenticity, do not absorb non-magnetic, that is good, genuine; suckers have magnetic, it is counterfeit fake. In fact, this is a very one-sided, imprecise and erroneous method of identification.
There are many kinds of electromagnetic valve iron core materials, which can be divided into several types according to the organizational structure at room temperature:
1. Austenitic type: such as 304, 321, 316, 310, etc.;
2. Martensite or ferrite type: such as 430, 420, 410, etc.;
The austenite type is either non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.
The solenoid valve core material usually used as a decorative tube plate is mostly an austenitic type 304 material. Generally, it is non-magnetic or weak-weak. However, magnetic properties may occur due to chemical composition fluctuations or processing conditions caused by smelting. This cannot be regarded as counterfeit or unqualified. What are the reasons for this?
The above mentioned austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, a small amount of martensite in the austenitic 304 solenoid valve iron core material may be caused. Body or ferrite tissue. In this way, 304 solenoid valve core material will have a weak magnetic.
In addition, the core material of 304 solenoid valve after cold processing, the organization structure will also be transformed to martensite, the greater the cold deformation degree, the more martensite transformation, the greater the magnetic steel. Such as the same batch of steel, production Φ76 tube, no significant sense of magnetic, production Φ9.5 tube. Due to the large bending deformation of the magnetic induction is obvious, the production of rectangular tube due to the deformation of the larger than the round tube, especially the folding part, the deformation is more intense magnetic more obvious.
In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, the stable austenite structure can be recovered by high-temperature solution treatment, thereby eliminating magnetic properties.
In particular, the magnetism of the core material of the 304 solenoid valve caused by the above causes is not entirely the same as that of the magnetic core materials of other materials such as 430 and carbon steel, that is, the magnetic properties of the 304 steel. Always shows weak magnetism.

PREVIOUS：Solenoid valve core material electromagnetic NEXT：Chemical Machinery Equipment: How to Choose S