In the hydraulic equipment, electromagnetic relief valve due to be able to play a constant pressure overflow, the system unloading and safety protection has been the favor of many home improvement consumers. However, many users do not know it well, it does not matter, the following small for everyone to introduce the working principle of electromagnetic relief valve and its role.
Electromagnetic relief valve works
In principle, the electromagnetic relief valve is usually composed of a pilot relief valve plus a 2-position 2-way solenoid valve. The solenoid valve actually consists of two parts: 2 2-way hydraulic valve part, plus an electromagnet. 2 2-way valve is open, or closed, is driven by the solenoid valve spool movement to achieve. Some valve electromagnet open when energized, and some open when the valve electromagnet power, turnip greens individual love (according to system requirements).
That is to say, the solenoid valve has a passage connected to one part of the pilot relief valve and the other end connected to the fuel tank through a tubing. By operating the electromagnet, a part of the pilot relief valve can be either connected to the tank or not to the tank.
The main valve on the pilot relief valve pressure chamber, the pilot valve is added to the control. If the pilot valve work, that is, the pilot valve on the main valve cavity pressure, the entire relief valve will be in the system pressure reaches the set pressure when the main valve opening to open a certain degree of opening, on the one hand the excess system flow Back to the tank, on the other hand can maintain the system pressure for the pilot valve set value. Can be seen that the main pilot valve pressure, the main valve obeys the leadership of the pilot valve in the pilot valve action will open the main valve port to the right size, just the excess flow out, without affecting the system pressure.
Electromagnetic relief valve role
1, constant pressure overflow effect: In the quantitative pump throttling regulation system, the quantitative pump provides a constant flow. When the system pressure increases, will reduce the demand for traffic. At this point, the relief valve is opened to allow excess flow to overflow into the fuel tank to ensure that the relief valve inlet pressure is constant, ie the pressure at the pump outlet is constant (the valve port often opens with pressure fluctuations).
2, the role of regulator: Relief valve in series in the return line, pressure relief valve back pressure, increased stability of moving parts.
3, the system unloading role: In the relief valve remote control port overflow overflow flow solenoid valve, when the solenoid is energized, the relief valve remote control port through the tank, then unloading hydraulic pump. Relief valve at this time as a unloading valve.
4, the role of security protection: When the system is working, the valve is closed. Only when the load exceeds the specified limit (the system pressure exceeds the set pressure), the overflow will be opened and over load protection will be implemented to prevent the system pressure from increasing (usually, the setting pressure of the relief valve is 10% ~ 20% higher than the maximum working pressure of the system. ).
The above is the introduction of the working principle of electromagnetic relief valve and its role, I hope we can understand the electromagnetic relief valve helpful. In addition, if the relief valve itself improper use of the assembly or use will cause vibration, resulting in noise, so we need to pay attention to this.
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