Product Introduction

Brass valve body shell water glass investment casting parts

Electromagnetic valves are automation basic components used to control fluids and belong to actuators; Not limited to hydraulic, pneumatic. Electromagnetic valves are used to control the direction of hydraulic flow, and mechanical devices in factories are generally controlled by hydraulic steel, so electromagnetic valves are used.

The working principle of an electromagnetic valve is that there is a closed chamber inside the valve, with through holes opened at different positions, each hole leading to a different oil pipe. In the middle of the chamber is a valve, and there are two electromagnets on both sides. The magnetic coil on which side is energized will attract the valve body to which side. By controlling the movement of the valve body, different oil discharge holes can be blocked or leaked. The oil inlet hole is normally open, and hydraulic oil will enter different oil discharge pipes. Then, the oil pressure will push the piston of the oil cylinder, which in turn drives the piston rod, and the piston rod drives the mechanical device to move. In this way, mechanical motion is controlled by controlling the current of the electromagnet.

The above is about the common principle of solenoid valves

In fact, based on the temperature and pressure of the medium flowing through it, such as the presence of pressure in the pipeline and the absence of pressure in the self flowing state. The working principle of solenoid valves is different.

For example, in the self current state, zero voltage starting is required, which means that after being powered on, the entire coil sucks up the gate body.

The electromagnetic valve in a pressure state is a pin inserted into the gate body after the coil is energized, and the gate body is lifted up by the pressure of the fluid itself.

The difference between these two methods is that the electromagnetic valve in the self flowing state has a larger volume because the coil needs to suck up the entire gate body

The electromagnetic valve in a pressurized state only needs to lift the pin, so the volume can be made relatively small.

Direct acting solenoid valve

Principle: When powered on, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing part against the valve seat, causing the valve to close.

Features: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.

Distributed direct acting solenoid valve

Principle: It is a combination of direct action and pilot type principle. When there is no pressure difference between the inlet and outlet, after being energized, the electromagnetic force directly lifts the pilot small valve and the main valve closure part upwards, and the valve opens. When the inlet and outlet reach the starting pressure difference, after being energized, the electromagnetic force leads the small valve, and the pressure in the lower chamber of the main valve increases while the pressure in the upper chamber decreases, thereby using the pressure difference to push the main valve upwards; When the power is cut off, the pilot valve uses spring force or medium pressure to push the closing part downwards, causing the valve to close.

Features: It can also operate under zero pressure difference, vacuum, and high pressure, but the power is high and requires horizontal installation.

Pilot operated solenoid valve

Principle: When powered on, the electromagnetic force opens the pilot hole, causing a rapid decrease in pressure in the upper chamber, creating a pressure difference of up, down, and up around the closing element. The fluid pressure pushes the closing element upwards, causing the valve to open; When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly forms a pressure difference of lower and higher around the closing valve through the bypass hole. The fluid pressure drives the closing valve to move downwards and close the valve.

Features: The upper limit of the fluid pressure range is relatively high, and it can be installed arbitrarily (customized), but it must meet the conditions of fluid pressure difference.

A two position two way solenoid valve consists of a valve body and an electromagnetic coil. It is a direct acting structure with a built-in bridge rectifier circuit and overvoltage and overcurrent safety protection

The solenoid valve coil is not energized. At this point, the iron core of the solenoid valve leans against the double tube end under the action of the return spring, closing the double tube end outlet. The single tube end outlet is in an open state, and the refrigerant flows from the single tube end outlet pipe of the solenoid valve to the evaporator in the refrigeration room and the evaporator in the refrigeration room and back to the compressor, achieving a refrigeration cycle.

The solenoid valve coil is energized. At this point, the iron core of the solenoid valve overcomes the force of the return spring under the action of electromagnetic force and moves to the single tube end, closing the single tube end outlet. The double tube end outlet is in an open state, and the refrigerant flows from the double tube end outlet pipe of the solenoid valve to the evaporator in the freezer and back to the compressor, achieving a refrigeration cycle.

The two position three-way solenoid valve consists of a valve body and an electromagnetic coil. It is a direct acting structure with a built-in bridge rectifier circuit and overvoltage and overcurrent safety protection? Working state one in the system: the solenoid valve coil is not powered on. At this point, the iron core of the solenoid valve leans against the double tube end under the action of the return spring, closing the double tube end outlet. The single tube end outlet is in an open state, and the refrigerant flows from the single tube end outlet pipe of the solenoid valve to the evaporator in the refrigeration room and the evaporator in the refrigeration room and back to the compressor, achieving a refrigeration cycle. (As shown in Figure 1)

Working state two in the system: the solenoid valve coil is energized. At this point, the iron core of the solenoid valve overcomes the force of the return spring under the action of the electromagnetic force and moves to the single tube end, closing the outlet of the single tube end. The outlet of the double tube end is in an open state, and the refrigerant flows from the outlet pipe of the solenoid valve to the evaporator of the freezer and back to the compressor, achieving a refrigeration cycle

We are the manufacturer of Brass valve body shell silica sol investment casting, if you need more information please contact us!

Detection Systems

Copper Silica Sol Investment Casting