157B4028 157B4032 155G4284 Danfoss PVG120 Proportional Valve 400 bar

Product Overview

The PVG120 series load-sensing proportional valves are modular load-sensing proportional valve groups engineered by Danfoss (formerly Sauer-Danfoss) for mobile machinery and industrial hydraulic systems. The PVG120 is a combined directional and flow control valve that, through modular construction, enables a single valve group to control all machine functions.

The PVG120 features load-independent flow control—oil flow to an individual function is independent of the load of that function and independent of the load pressure of other functions, providing excellent regulation characteristics and energy efficiency. The modular design allows the valve group to be flexibly configured to match specific customer requirements, with up to eight basic modules per valve group.

This product range covers the following key modules and components:

• 157B4028: Danfoss PVEH Electro-Hydraulic Proportional Actuator Module for proportional electrical control of PVG32/PVG120 valves. 11–32V wide-range supply with DEUTSCH DT04-2P connector. Coil resistance approx. 4.6 Ω.

• 157B4032: Danfoss PVEH32 Electro-Hydraulic Proportional Actuator Module, an upgraded/derived model of 157B4028. 11–32V supply, compatible with PVG32/PVG120. Weight approx. 0.9 kg.

• 155G4284: Danfoss PVEO Electro-Hydraulic Actuator for ON-OFF control of PVG120 proportional valves. 24V supply, AMP 1×4 connector, S4 series. Note: This product has been discontinued and replaced by the PVE Series 7 actuator (11166816) .

Our complete range of Danfoss PVG120 modules strictly adheres to OEM technical standards, achieving 100% direct interchangeability with original components. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring performance parameters are fully consistent with genuine Danfoss products. Direct replacement significantly reduces equipment downtime and maintenance costs.

Technical Specifications

PVG120 Proportional Valve Group (System Level)

• Product Series: Danfoss PVG120 load-sensing proportional valve group

• Product Type: Load-sensing proportional directional flow control valve

• Brand: Danfoss (Sauer-Danfoss)

• Maximum System Pressure (P Port) : 400 bar (5800 psi)

• Maximum Port Pressure (A/B, Continuous) : 400 bar (5800 psi)

• Maximum Port Pressure (A/B, Intermittent Peak) : 420 bar (6090 psi)

• Maximum Oil Flow (P Port Entry) : 240 L/min (63.4 US gal/min)

• Maximum Oil Flow (A/B Ports) : 240 L/min / 300 L/min (configuration dependent)

• System Type: Open center (fixed displacement pumps) or Closed center (variable displacement pumps)

• Maximum Modules: 8 basic modules

• Recommended Cleanliness: ISO 4406 Code 23/19/16

• Mounting Type: Modular stacked installation

• Actuation Options: Electro-hydraulic (PVEH/PVEO/PVEH 32) / Hydraulic (PVH) / Mechanical (PVM)

157B4028 (PVEH Proportional Actuator Module)

• Product Type: Danfoss PVEH proportional electro-hydraulic actuator module

• Part Number: 157B4028

• Also Known As: SAUER 030752

• Supply Voltage: 11 – 32 V DC

• Coil Resistance: Approx. 4.6 Ω

• Connector Type: DEUTSCH DT04-2P

• Actuator Type: Proportional

• Compatible Valve Series: PVG 32 / PVG 100 / PVG 120

• Weight: Refer to PVEH series standard (approx. 0.5–0.9 kg)

157B4032 (PVEH32 Proportional Actuator Module)

• Product Type: Danfoss PVEH32 proportional electro-hydraulic actuator module

• Part Number: 157B4032

• Supply Voltage: 11 – 32 V DC

• Weight: Approx. 0.9 kg

• Compatible Valve Series: PVG 32 / PVG 120

155G4284 (PVEO On-Off Actuator)

• Product Type: Danfoss PVEO electro-hydraulic actuator (ON-OFF)

• Part Number: 155G4284

• Supply Voltage: 24 V DC

• Connector Type: AMP 1×4

• PVE Series: S4 (Series 4)

• Compatible Valve Series: PVG 120

• Function: ON-OFF

• Input Signal: Voltage signal

• Status: Discontinued – replaced by 11166816 (PVE Series 7)

Key Technical Advantages

1. Load-Independent Flow Control for Precise Actuator Speed Control

The PVG120 features load-independent flow control—flow to an actuator remains constant regardless of load variations or the load pressure of other simultaneously operating actuators. This ensures constant actuator speed under all operating conditions, significantly improving machine controllability and operator comfort.

2. Modular Design for Flexible Configuration

The PVG120 is a combined directional and flow control valve that can be configured by selecting different modules (PVP pump-side module, PVB basic module, PVBS main spools, PVE/PVM/PVH actuators). Up to eight basic modules can be integrated into a single valve group, enabling control of all machine functions with one valve group. The modular design allows flexible configuration from simple to complex hydraulic systems.

3. High-Performance Proportional Electro-Hydraulic Control (PVEH 157B4028/157B4032)

PVEH actuator modules convert electrical control signals into precise hydraulic pilot pressure, driving the main spool for stepless proportional flow control. The 11–32V wide voltage range accommodates various vehicle electrical systems, while the DEUTSCH DT04-2P connector ensures reliable electrical connection in harsh environments with vibration and moisture. Coil resistance approx. 4.6 Ω ensures fast response and precise control.

4. System Pressure up to 400 bar, Flow up to 240 L/min

The PVG120 supports 400 bar system pressure and 240 L/min inlet flow. A/B port continuous pressure is 400 bar with intermittent peak pressure of 420 bar. This performance makes it the ideal choice for hydraulic systems in medium to large mobile machinery including construction, agricultural, and material handling equipment.

5. Energy-Saving Design

The PVG120 features a built-in central pilot supply that eliminates the need for a separate pilot oil source in electro-hydraulic control applications. The load-sensing system itself is energy-efficient—the pump delivers only the flow and pressure required by the actuators, significantly reducing overflow losses and system heat generation.

6. 100% Direct Interchangeability and Simulated Condition Testing

All PVG120 modules strictly adhere to Danfoss original mounting dimensions and interface standards. Modules within the same valve group are 100% interchangeable without manifold modification or system adjustment. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring consistent, stable performance at rated pressure and flow.

Application Areas

• Construction Machinery: Multi-actuator hydraulic control for excavators, wheel loaders, motor graders, road rollers

• Agricultural Machinery: Hydraulic system control for large tractors and combines

• Material Handling Equipment: Hydraulic systems for forklifts, reach stackers, telescopic handlers

• Road Construction Equipment: Travel and working attachment control for pavers and milling machines

• Forestry Machinery: Hydraulic systems for harvesters and skidders

• Mining Equipment: Hydraulic systems for underground LHDs and mining trucks

• Specialty Vehicles: Hydraulic systems for aerial work platforms and concrete pump trucks

Expert Maintenance Tips

1. Verify Model and System Compatibility Prior to Installation

The PVG120 is a modular valve group—all modules (PVP pump-side module, PVB basic module, PVE actuators, etc.) must be mutually compatible. Confirm prior to installation:

• Supply voltage matches the actuator (157B4028/157B4032: 11–32V; 155G4284: 24V)

• Connector type matches the controller harness (157B4028: DEUTSCH DT04-2P; 155G4284: AMP 1×4)

• Spool function matches system control requirements

2. Electrical Connection Precautions

• 157B4028/157B4032: Features DEUTSCH DT04-2P connector, supply 11–32V DC, coil resistance approx. 4.6 Ω. Verify supply voltage is within allowable range prior to wiring.

• 155G4284: Features AMP 1×4 connector, supply 24V DC, function ON-OFF. Observe correct polarity prior to wiring.

3. Oil Cleanliness Management

The PVG120 is a precision proportional valve demanding adequate oil cleanliness. Recommended system cleanliness: ISO 4406 Code 23/19/16 or higher. Install high-precision filters (filtration rating ≤10μm) in the system return line and inspect filter elements regularly.

4. Installation Torque and Sealing

For PVG120 modular valve group installation, use OEM-specification O-rings between modules. Use a torque wrench to tighten mounting bolts diagonally to the torque values specified in Danfoss technical manuals to prevent valve body distortion or leakage from uneven tightening.

5. System Commissioning and Calibration

After replacing PVG120 modules, re-commission the system:

• Verify pilot pressure (provided by PVE modules in electro-hydraulic control) is normal

• Verify the proportional relationship between control signal and spool displacement meets expectations

• Gradually load to rated conditions while monitoring system response for smooth operation, oscillation, or hysteresis

6. Periodic Functional Checks

Perform functional checks every 2,000 operating hours or annually: verify actuator operation, spool shifting smoothness, external leakage, and electrical connection integrity. If sluggish response, abnormal operation, or leakage is observed, arrange for servicing or replacement.

7. 155G4284 Discontinuation and Replacement

155G4284 (PVEO 24V AMP) has been officially discontinued and is fully replaced by the PVE Series 7 actuator (Part No. 11166816) . The replacement product features identical mounting dimensions and performance parameters, enabling 100% direct interchangeability. It is recommended to select the replacement model for new system builds or retrofit applications.