Hydraulic Pressure Reducing Valve
A pressure reducing valve is a type of pressure control valve. Its main function is to reduce the high-pressure hydraulic fluid in a system to the required lower pressure and maintain the outlet pressure at a stable level, unaffected by variations in inlet pressure or flow rate.

Working principle:
When the outlet pressure exceeds the set value, the valve spool shifts to restrict oil flow, maintaining the downstream pressure within the desired range.

Function:
Provides different working pressures for different actuators within the same hydraulic power source.

Features
• Ensures that the pressure in a local circuit is lower than the main system pressure.
• Protects low-pressure actuators and prevents damage caused by overpressure.
• Increases system flexibility, allowing one pump to supply actuators with different pressure requirements.

Applications
1. Machining Fixtures: The main system pressure may be high, but the reducing valve provides low pressure for clamping or positioning cylinders.
2. Plastic Injection and Die-Casting Equipment: Mold opening/closing requires high pressure, while ejector pins or auxiliary cylinders need only low pressure; the reducing valve supplies the appropriate working pressure.
3. Hydraulic Chucks / Hydraulic Collets: Requires medium to low pressure control to ensure the workpiece is not damaged by excessive clamping force.
4. Presses / Forming Equipment: Multi-stage pressure control; the main cylinder uses high pressure for forming, while auxiliary cylinders require low pressure for positioning.
5. Automation Machinery / Handling Equipment: Some actions only require low-pressure feed; using a reducing valve avoids energy waste and excessive wear.
6. Safety Protection: Prevents overpressure damage when certain system components can only withstand lower pressure levels.

Example
A hydraulic system needs to drive both a clamping cylinder (30 bar) and a main cylinder (150 bar) simultaneously:
• The main system pressure is maintained at 150 bar.
• A pressure reducing valve is installed in the clamping cylinder circuit, set at 30 bar.
Result: The main cylinder performs high-pressure forming at 150 bar, while the clamping cylinder operates safely at 30 bar, preventing damage to the workpiece.