Electric Control Power Valve EK1, EK2, EP1, EP2
5 day ago
Product details
Electric Control Power Valve EK1, EK2, EP1, EP2
1. Product Overview
The EK1, EK2, EP1 and EP2 electronically controlled power valves are proportional electronic regulators specially matched with variable displacement axial piston pumps. These EPC electronic power control valves serve as the core control components of closed-loop hydraulic system, receiving electric signals from the controller to adjust pump displacement automatically. They realize constant power control, negative flow control and cross-sensing power limitation, perfectly matching engine output power and avoiding engine stall under heavy load conditions. Widely used on Rexroth A8VO, A4VG series pumps as well as domestic replacement piston pumps, these valves are extensively equipped on large excavators, mining machinery and heavy construction equipment. Four models (EK1, EK2, EP1, EP2) are available for different control modes and voltage specifications.
Model Code Explanation
- EK series: Electric negative flow control valves
- EP series: Electronic constant power proportional valves
- Suffix 1 / 2: Different coil configurations and control signal parameters
2. Main Technical Parameters
Item Specification
Product Type Electronically controlled proportional power regulator valve
Standard Voltage DC 24V (excavator standard voltage)
Control Signal 0~5V or 4~20mA proportional signal
Working Pressure 35MPa maximum system pressure
Coil insulation class Class H, high temperature resistance
Standard Seals FKM fluorine rubber for high temperature working environment
Applicable Oil ISO VG46 anti-wear hydraulic oil
Operating Temperature -20℃ ~ +105℃
Fit Pump Models A4VG, A8VO series axial piston pumps
Installation Type Screw-in cartridge mounting on pump end cap
3. Working Principle
The electronic controller sends proportional electric signals to the solenoid coil of the electric control power valve. The valve spool moves proportionally according to signal strength, changing the pilot pressure acting on the pump swashplate actuator. By adjusting the swashplate angle of the hydraulic piston pump, the pump flow and output power are regulated in real time. EP series maintains constant power regardless of pressure changes; EK series adopts negative flow control to improve system response and fuel economy. The valve limits maximum absorbed power to match engine rating and prevents engine overload shutdown.
4. Core Advantages
1. Precise proportional electronic control, high response speed and stable regulation performance.
2. Optimized power matching reduces fuel consumption and prevents engine stall.
3. High temperature resistant coil design, suitable for harsh engine compartment environment.
4. Direct cartridge installation on hydraulic piston pump, compact structure without extra pipelines.
5. Four model options (EK1,EK2,EP1,EP2) to meet different control system requirements.
6. Perfect interchangeability with original OEM valves for pump overhaul replacement.
7. Stable anti-vibration performance, adaptable to severe vibration of construction machinery.
5. Application Range
These electric control power valves are key components of main pump hydraulic system, widely used for 20 ton to 50 ton excavators, road headers, drilling rigs and other heavy-duty engineering machinery, matched with Rexroth series variable piston pumps.
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