What are the application scenarios of superimposed relief valves?

The application scenarios of superimposed relief valves are as follows:

1. Construction machinery field

Voltage limiting protection and voltage stabilization control

Excavators and loaders: It serves as the main oil line pressure limiting valve in the hydraulic system to prevent the system from being overloaded and causing damage to the cylinder or pump. For example, when the load suddenly increases, the relief valve opens to release excess pressure and protect the safety of the equipment.

Hydraulic lifting platform: By stabilizing the system pressure, it ensures that the platform lifts at a safe speed and avoids shaking or loss of control due to pressure fluctuations.

Remote pressure regulation and multi-stage pressure control

Multi-station equipment: Utilize the remote control port (X port) of the pilot relief valve to achieve remote pressure adjustment through the solenoid valve. For example, in an automated production line, when different workstations require different working pressures, the setting value of the relief valve can be adjusted remotely through electrical signals to reduce manual intervention.

Testing machine: During the material tension and compression test, the pressure of the relief valve is continuously adjusted through the proportional electromagnet to realize complex control logic such as ramp pressure rise/fall and pressure maintenance to simulate actual working conditions.

2. Metallurgy and metal processing industry

Pressure stabilization of rolling mill hydraulic system

Metallurgical rolling mill: In the quantitative pump system, the superimposed relief valve serves as a pressure stabilizing valve to maintain constant system pressure through continuous overflow, ensuring stable rolling force and avoiding uneven plate thickness due to pressure fluctuations.

Injection molding machine: In the mold cavity pressure control, the proportional relief valve adjusts the pressure steplessly according to the electrical signal to ensure uniform filling of plastic melt and reduce product defects.

Safety protection and overload prevention

Metal press: When the load exceeds the set value, the overflow valve opens instantly to prevent damage to the mold or equipment. For example, when a stamping machine is stamping hard materials, a relief valve can prevent the mold from rupturing due to excessive pressure.

3. Shipbuilding and aerospace fields

Ship steering gear system

Steering gear hydraulic system: The superimposed relief valve acts as a safety valve to prevent pressure peaks from causing malfunctions. For example, when the ship is turning, if the steering gear load suddenly changes, the relief valve can quickly release excess pressure to protect the hydraulic pump and pipelines.

Aerospace equipment

Satellite attitude control: In the micro-satellite reaction wheel, the superimposed relief valve ensures the stability of the axial load in a microgravity environment through precise pressure regulation, preventing pressure fluctuations from affecting the satellite attitude adjustment accuracy.

Missile guidance system: In the gyro hydraulic drive, the relief valve uses the electromagnetic unloading function to quickly unload the system, reduce energy consumption, and prevent excessive pressure from damaging precision components.

4. Industrial automation and robots

CNC machine tools and robots

Hydraulic station: Connect the solenoid valve through the remote control port to realize system unloading, saving energy and reducing consumption. For example, when the machine tool is idle, the relief valve reduces the pump outlet pressure to zero, reducing no-load energy consumption.

Manipulator joint drive: The superimposed proportional relief valve continuously adjusts the joint hydraulic cylinder pressure according to electrical signals to achieve accurate force control and avoid damage to workpieces or equipment due to excessive pressure.

Automated production line

Multi-stage pressure control: In the assembly line, when different work stations require different clamping forces, the pressure can be remotely adjusted through the proportional relief valve to adapt to diversified production needs. For example, in automobile welding production lines, the relief valve can adjust the clamping pressure according to the car model to ensure welding quality.

5. Special environment and high-precision requirements

High voltage system applications

High-pressure hydraulic pump station: such as the Rexroth Z2DB10VD2-4X/315V model, which uses precision grinding of the valve core and enhanced sealing technology to operate stably under a high pressure of 315 bar and has a lifespan of millions of operations. It is suitable for mining machinery, hydraulic supports and other scenarios.

Clean environment requirements

Food processing equipment: The stacked relief valve is made of stainless steel and food-grade sealing rings, which meet hygienic standards and prevent hydraulic oil leakage from contaminating products. For example, in dairy production lines, relief valves are used to control transfer pump pressure to ensure a steady flow of fluid.