Hydraulic pressure control valves are essential components in hydraulic systems, playing a crucial role in regulating
Hydraulic pressure control valves are key components in hydraulic systems used to regulate, limit or stabilize pressure, ensuring the system operates within a safe range and optimizing the performance of the actuator. Here is a core introduction to them:
---
## **1. Main Functions**
- **Pressure Regulation**: Set the maximum working pressure of the system (e.g., relief valve).
- **Pressure Stabilization**: Maintain a constant pressure in the branch circuit (e.g., pressure reducing valve).
- **Pressure Protection**: Prevent system overpressure and component damage (e.g., safety valve).
- **Pressure Sequence Control**: Trigger actions based on pressure signals (e.g., Sequence Valve).
---
## 2. Common Types and Characteristics
| Type | Function | Typical Applications |
|------|----------|-----------------------| |----------------|----------------------------------|-----------------------------|
| **Relief Valve** | Limits the maximum pressure in the system, and excess flow returns to the tank | Overload protection at the pump outlet |
| **Pressure Reducing Valve** | Reduces the pressure in the branch circuit and stabilizes the output | Low-pressure demand circuits such as clamping and lubrication |
| **Sequence Valve** | Controls the sequence of actuator operation based on pressure signals | Multi-step control in machine tools and injection molding machines |
| **Unloading Valve** | Unloads the pump when the system pressure reaches the set value, saving energy | Accumulator systems and intermittent operation equipment |
| **Counterbalance Valve** | Prevents the load from falling uncontrollably (pressure limiting + one-way) | Cranes, lifting platforms |
---
## **3. Core Performance Parameters**
- **Rated Pressure**: Such as 21 MPa, 35 MPa (selected based on system requirements).
- **Flow Range**: Matching the flow of the actuator (e.g., 10 to 100 L/min).
- **Control Method**: Manual adjustment, pilot control, and electromagnetic proportional control.
- **Response Time**: Crucial for high-frequency dynamic systems (e.g., servo hydraulics).
---
## **4. Typical Application Scenarios**
- **Construction Machinery**: Pressure protection for the hydraulic systems of excavators and loaders.
- **Industrial Hydraulics**: Multi-level pressure control for injection molding machines and die-casting machines.
- **Aerospace**: Pressure stabilization for the hydraulic circuits of landing gears and actuators.
- **Machine Tools**: Ensuring stable pressure in feed systems to prevent shock.
---
## **5. Key Points for Selection**
1. **System Pressure Rating**: The valve's pressure resistance must be higher than the maximum system pressure.
2. **Control Accuracy**: Proportional valves should be selected for high-precision applications (such as servo systems).
3. **Medium Compatibility**: Mineral oil, water-based fluid, or fire-resistant hydraulic oil.
4. **Installation Method**: Plate-mounted, tube-mounted, or cartridge (such as two-way cartridge valves).
---
## **6. Advantages and Maintenance**
- **Advantages**: Enhance system security, save energy, and extend the lifespan of components.
- **Maintenance**: Regularly inspect for valve core jamming, spring fatigue, and seal leakage.
---
Contact Now