Views: 0 Author: Site Editor Publish Time: 2025-07-21 Origin: Site
The superimposed hydraulic control check valve is a hydraulic component that combines the function of the hydraulic control check valve with the superimposed installation structure. It has the characteristics of compact installation, high integration, small leakage, and fast response. It is widely used in hydraulic systems that require one-way locking, bidirectional flow control or pressure holding. The following is a detailed introduction to its core application scope and typical scenarios:
Application scenario: In vertical or horizontal hydraulic cylinder systems, it is necessary to prevent the load from accidentally moving due to self-weight or external force (such as machine tool workbench, injection molding machine template, lifting platform, etc.).
How it works:
When the hydraulic cylinder stops moving, the superimposed hydraulic control check valve closes, cuts off the oil circuit, locks the hydraulic cylinder in its current position, and achieves zero leakage pressure holding.
When reverse movement is required, pressure oil is introduced through the control port to open the valve core, allowing the hydraulic oil to flow in both directions.
Advantages: Compared with the combination of ordinary one-way valve + reversing valve, the superimposed design reduces leakage points and has higher locking accuracy, which is especially suitable for high-precision processing equipment.
Application scenarios: In the event that pressure needs to be maintained for a long time, such as hydraulic press pressure holding, die casting machine mold clamping, fixture clamping, etc.
How it works:
During the pressure holding stage, the superimposed hydraulic control check valve is closed to prevent the return of hydraulic oil and maintain the stability of the system pressure.
Through superimposed installation, it can be integrated with other valve types (such as relief valves, pressure reducing valves) to simplify circuit design.
Advantages: The pressure holding time is controllable and the pressure fluctuates small, which is suitable for scenarios with high requirements for process stability.
Application scenarios: cranes, elevators, fire ladders and other equipment that require suspended loads.
How it works:
When the hydraulic cylinder is stopped, the hydraulically controlled check valve is closed to prevent the load from falling due to gravity and ensure safety.
When it needs to be lowered, open the valve by controlling the pressure relief of the port to achieve a controllable load drop.
Advantages: Fast response speed and high reliability, avoiding heating problems caused by throttling of traditional balance valves.
Application scenarios: In cases where slewing mechanisms (such as excavator slewing platform, crane rotary arm) need to prevent inertia reversal.
How it works:
When the hydraulic motor stops, the hydraulic control check valve closes to lock the motor output shaft to prevent reversal.
When the reverse start is required, the valve is opened by controlling the oil to allow the motor to rotate in both directions.
Advantages: Compact structure, large braking torque, suitable for large inertia loads.
Application scenarios: Hydraulic fatigue testing machines, pressure vessel testing benches, etc. Where pressure or displacement is required to be accurately controlled.
How it works:
The hydraulically controlled check valve can achieve pressure or displacement locking, and data is collected in conjunction with sensors to ensure the accuracy of the test.
Advantages: The superimposed design is easy to integrate into the test loop and reduces system complexity.
Excavator/loader: used to lock the boom and rod hydraulic cylinder to prevent the load from falling during shutdown.
Crane: In the amplitude change mechanism and the slewing mechanism, load hovering and anti-reversal are achieved through a hydraulically controlled check valve.
Aerial working platform: lock the lifting hydraulic cylinder to ensure the stability of the platform during operation.
Injection molding machine: During the mold closing stage, the hydraulically controlled check valve locks the template to prevent the mold from being separated when molten plastic is injected.
Metal die casting machine: locks the moving die and bears the reaction force during high-pressure injection.
Robot: used for positioning joint hydraulic cylinders to improve the repeat positioning accuracy of the end effector.
Wind power generation pitch system: lock the blade angle to prevent strong wind from causing the blade to run out of control.
Ship servo: Lock the rudder blades when the ship is stopped to avoid deflection caused by water flow.
Steel rolling mill: lock and press the hydraulic cylinder to maintain stability in the roll gap.
Hydraulic support: In coal mine support, lock the column to prevent the roof plate from collapse.
Compact structure: adopts a superimposed design and can be installed directly on the reversing valve or bottom plate to reduce pipeline connections and reduce leakage risk.
Fast response: The hydraulically controlled opening pressure is low (usually 0.5~3MPa), the valve core is sensitive to action, suitable for high-frequency opening and closing scenarios.
Excellent pressure holding performance: Through a special sealing design, it can achieve long-term zero leakage pressure holding, and the pressure retention rate is ≥95%.
Multifunctional integration: It can be combined with superimposed relief valves, pressure reducing valves, etc. to realize the composite functions of pressure holding, pressure regulating, unloading and other factors.
Convenient maintenance: The modular structure is easy to disassemble and replace, reducing system downtime.
Diameter matching: Select the appropriate diameter according to the system flow rate to avoid cavitation or vibration caused by excessive flow rate of the valve port.
Control pressure: Ensure that the control oil pressure is higher than the system working pressure and prevent the valve core from being unable to open.
Impact of back pressure: When there is back pressure in the return oil circuit, a hydraulically controlled check valve with an outlet needs to be selected to prevent the valve core from being closed.
Cleanliness requirements: The cleanliness of hydraulic oil must reach NAS level 9 or above to prevent impurities from stagnating the valve core.
Temperature adaptability: Choose appropriate sealing materials (such as nitrile rubber, fluoroelastomer) according to the working environment temperature.
Through its unique structure and function, the superimposed hydraulic control check valve has become a key component in hydraulic systems for precise control, safe locking and efficient pressure maintenance, and is widely used in industrial fields that require strict reliability and accuracy.
