EPV Load Lowering Control Valve, Flange Mounted
The flange-mounted load lowering control valve is designed to provide precise and safe load control for hydraulic actuators. In the upward flow direction (A - A1), oil passes freely through a built-in check valve to the hydraulic cylinder. In reverse flow (A1 - A), the valve’s load-holding section blocks or throttles fluid movement, with the spool delivering precise flow regulation during opening. The valve remains normally closed and is remotely controlled by pilot pressure, ensuring stable load holding independent of load weight.
An internally built relief valve continuously senses the pressure at port A1 and automatically activates under excessive load or shock conditions to safeguard the hydraulic circuit. With adequate pilot pressure, the valve spool shifts completely open, enabling smooth and regulated discharge of cylinder pressure through port A and the main directional valve. This design ensures precise motion regulation, dependable overload protection, and improved operational safety for heavy-duty mobile equipment applications.
| Model | Pressure | Flow |
| EPV-12 Load Lowering Control Valve (Left/Right) | 350bar | 150L/min |
| EPV-14 Load Lowering Control Valve | 350bar | 250L/min |
| EPV-16 Load Lowering Control Valve | 350bar | 400L/min |
| Max. Operating Pressure | 350bar |
| Pilot Ratio | 1:0 |
| Balancing Valve Pressure Setting Range | 5-14bar |
| Overflow Valve Pressure Setting Range | 200-400bar |
| Fluid Temperature Range | -20℃～120℃ |
| Ambient Temperature Range | -40℃～80℃ |
| Hydraulic Fluid | General mineral oil (ISO 20～400mm²/s) |
This load Lowering control valve, often called an anti-burst valve, is built for use on excavator booms, arms, buckets, and attachments. It helps keep heavy loads steady and prevents sudden, uncontrolled movements during operation. It enhances equipment safety and operational stability in demanding construction and excavation environments:
- Prevents the boom from unexpectedly dropping due to hydraulic line rupture or spool leakage
- Protects the arm from sudden retraction or extension caused by external forces or hydraulic leakage
- Prevents the bucket from accidental tilting due to sudden load changes or hose failure
- Shields hydraulic breakers and other attachments from shock-induced hose loosening or bursting, avoiding sudden piston rod extension or retraction
