Industrial process control system with solenoid valve according to the way of action divided into three categories

The intelligent toilet solenoid valve used in industrial process control system can be divided into three types according to the mode of action: direct action type, direct action type and lead type. How much does the solenoid valve cost? From the different structure, material and principle of the valve disc, stepping direct acting type can be divided into: stepping direct acting diaphragm solenoid valve and stepping direct acting piston solenoid valve; The pilot type can be divided into: pilot diaphragm solenoid valve, pilot piston solenoid valve; From the seat and sealing material, can be divided into: soft sealing solenoid valve, steel sealing solenoid valve and semi-steel sealing solenoid valve.

1. Direct acting intelligent toilet solenoid valve:

The intelligent toilet solenoid valve is simple in structure and consists of coil, fixed iron core, moving iron core and valve body.

Principle: when the normally closed direct moving solenoid valve is energized, the electromagnetic coil produces electromagnetic suction to promote the spool, so that the valve seal leaves the valve seat, the valve opens; When the power is off, the electromagnetic force disappears, the seal on the spool is pressed on the seat mouth by the spring force, and the valve is closed. (Contrary to normally open)

Features: it can work normally under vacuum, negative pressure and zero differential pressure. The larger the valve diameter, the larger the size and power of the magnetic head. For example, we use herion technology to produce direct acting solenoid valve can be used in 1.33×10-4 MPa vacuum.

Scope of application:

The intelligent toilet solenoid valve is mainly used under low power or direct action, so it is only suitable for the intelligent toilet solenoid valve under low power conditions.

2, pilot operation solenoid valve:

Principle: when energized, electromagnetic force to drive the pilot valve to open the pilot valve, the main valve chamber pressure drops rapidly, the formation of pressure difference in the main valve chamber, the main valve closing parts move up, relying on the medium pressure to open the valve; Power, the spring force to close the pilot valve, the inlet medium pressure through the throttle hole quickly into the main valve chamber, the formation of differential pressure in the upper chamber, so as to close the main valve.

Features: small volume, low power, but the range of pressure difference is limited, must meet the pressure difference condition (0.01Mpa).

Scope of application:

According to this principle, pilot solenoid valves are more suitable for large diameter and high pressure conditions. However, it must be noted that the circulating medium must have a certain pressure. Solenoid valve manufacturers of various pilot solenoid valve requirements medium pressure is greater than 0.01Mpa, can be used normally.

3, distributed direct action solenoid valve (recoil type)

Recoil solenoid valve (that is, no differential pressure), also known as step by step direct solenoid valve, is a set of direct and pilot structure in one of the electromagnetic valve. Solenoid valve manufacturers it can not only open the main valve plug through the suction of the coil in the case of no pressure in the medium, but also can make the main valve plug pressure difference, in the case of high pressure in the medium to open the solenoid valve.

Principle: its principle is the combination of direct action and pilot. When energized, solenoid valve first open auxiliary valve. The pressure of the lower chamber of the main valve is greater than the pressure of the upper chamber, the use of differential pressure and electromagnetic force at the same time to open the valve; In case of power failure, the auxiliary valve uses spring force or medium pressure to push the closing seal and move the closing valve port down.

Features: when the pressure difference is zero or about a certain pressure, it can work reliably. Generally, the working pressure difference does not exceed 0.6MPa. However, the magnetic head has large power and volume and requires vertical installation.

Scope of application:

In general, recoil solenoid coil volume and power is greater than the lead type. It is more suitable for medium pressure from zero to several kilograms, also suitable for large diameter solenoid valves. In particular, recoil solenoid valves must be installed horizontally! Small diameter recoil solenoid valves can also be installed vertically, but users should specify.