MCV116A3204 Danfoss Pressure Control Pilot Valve 350 bar

Product Overview

The MCV116A3204 is a Pressure Control Pilot (PCP) valve from the Danfoss MCV116 series, engineered by Danfoss (formerly Sauer-Danfoss) . As the core proportional control component for the Series 90 variable displacement piston pumps, this valve converts a 4–20 mA electrical control signal into a proportional pilot differential pressure, driving the pump’s servo piston to adjust the swashplate angle for precise electro-hydraulic displacement and flow control.

The MCV116A3204 features a torque-motor actuated, double-nozzle flapper pilot stage. The torque motor receives a DC milliamp current signal and drives the flapper via electromagnetic torque, producing a differential pressure output proportional to the control signal. This pilot pressure directly actuates the servo piston of the Series 90 pump for precise pump displacement control.

The MCV116A3204 is a single-stage, standalone, closed loop pressure control valve that uses internal hydraulic pressure reactions to achieve its closed loop control characteristics—no external pressure sensors or additional feedback loops are required.

⚠️ Brand and Model Attribution Note: The MCV116A3204 belongs to the Danfoss (Sauer-Danfoss) brand. The “Sundstrand Pump” referenced in the original title refers to the Danfoss (formerly Sauer-Sundstrand) Series 90 variable displacement piston pumps.

⚠️ Model Code Decoding:

• MCV = Pressure Control Pilot

• 116 = Series code

• A = Configuration/design version code (A series)

• 3204 = Specific configuration code

Technical Specifications 

• Product Series: Danfoss MCV116 series Pressure Control Pilot (PCP) valve

• Model Code: MCV116A3204

• Brand: Danfoss (Sauer-Danfoss)

• Product Type: Electro-hydraulic proportional pressure control pilot valve

• Actuator Type: Torque motor

• Pilot Stage: Double-nozzle flapper

• Control Type: Single-stage, standalone, closed loop pressure control

• Feedback Method: Internal hydraulic pressure reactions – no external sensors required

• Compatible Pump Series: Danfoss Series 90 variable displacement pumps (90R/90L)

• Maximum Operating Pressure: 350 bar (5000 psi)

• Maximum Flow: 60 L/min

• Input Control Signal: 4–20 mA DC

• Power Supply: 24 VDC

• Body Material: Iron or steel alloy

• Operating Temperature: -20°C to +80°C

• Mounting Type: Direct plate mounting on pump head

• Weight: Approx. 1.8–2.0 kg

• Approvals: EN ISO 12100

• Design Features: Torque-motor nozzle-flapper closed-loop structure, good control linearity, strong anti-vibration and anti-pollution performance, compact modular layout

Key Technical Advantages

1. Torque-Motor Actuation for High-Precision Electro-Hydraulic Proportional Control

The MCV116A3204 utilizes a torque motor as the electro-mechanical transducer. The torque motor receives a 4–20 mA DC current signal and drives the flapper via electromagnetic torque, producing a differential pressure output proportional to the control signal. Compared to conventional proportional solenoids, the torque motor delivers superior control precision, faster response, and lower hysteresis—the core technology enabling closed-loop pump displacement control.

2. Double-Nozzle Flapper Pilot Stage for Precise Differential Pressure Output

The MCV116A3204 features a double-nozzle flapper pilot stage. As the flapper deflects under torque motor actuation, the outlet pressures of the two nozzles change in opposite directions—one increasing while the other decreases—producing a differential pressure output proportional to the control signal. This differential pressure directly drives the servo piston of the Series 90 pump for precise pump displacement control.

3. Single-Stage Standalone Closed-Loop Control – No External Feedback Required

The MCV116A3204 is a single-stage, standalone, closed loop pressure control valve. It uses internal hydraulic pressure reactions to achieve its closed loop control characteristics—no external pressure sensors or additional feedback loops are required. This design significantly simplifies system integration and reduces total cost.

4. Rugged Construction for Harsh Operating Conditions

The MCV116A3204 features a high-strength iron or steel alloy valve body, capable of withstanding mobile equipment vibration and shock conditions. The operating temperature range is -20°C to +80°C. With excellent vibration and contamination resistance, it meets the demanding requirements of harsh construction machinery environments.

5. Broad Compatibility and Flexible Configuration

The MCV116A3204 is compatible with Danfoss Series 90 variable displacement pumps (90R/90L) . Standard 4–20 mA industrial control signals and 24V DC power supply enable seamless integration with various electronic control systems. Maximum operating pressure is 350 bar with maximum flow of 60 L/min.

6. Modular Compact Design for Simplified System Integration

The MCV116A3204 features a modular compact design with direct plate mounting on the pump head. The compact footprint and easy installation deliver high-performance proportional control within limited installation space. The stable differential pressure output perfectly matches heavy-duty construction machinery hydraulic systems.

7. 100% Direct Interchangeability and Simulated Condition Testing

The MCV116A3204 strictly adheres to Danfoss original mounting dimensions and interface standards, enabling direct drop-in replacement of original actuators without pump modification or system adjustment. Every unit undergoes 100% simulated operating condition bench testing, ensuring consistent, stable performance at rated pressure and temperature.

Application Areas

• Construction Machinery: Electro-hydraulic pump displacement control for excavators, wheel loaders, motor graders, road rollers

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

• Agricultural Machinery: Displacement control for hydrostatic transmission (HST) systems in large tractors and combines

• Material Handling Equipment: Pump displacement control for forklifts, reach stackers, telescopic handlers

• Mining Equipment: Hydrostatic drive systems for underground LHDs and mining trucks

• Industrial Hydraulic Systems: Pressure control for hydraulic presses, injection molding machines, die-casting machines

Expert Maintenance Tips

1. Verify Model and Pump Compatibility Prior to Installation

The MCV116A3204 is a dedicated control valve for Series 90 variable displacement pumps. Confirm that the pump type is Danfoss Series 90 (90R/90L) prior to installation. Mismatched models will result in abnormal control characteristics and significantly impair system performance.

2. Electrical Wiring Precautions

The MCV116A3204 features an input control signal of 4–20 mA DC with 24V DC power supply. High voltage or high current signals must never be applied, as this will damage the internal torque motor coils. Verify that the controller output signal type matches the valve specifications prior to wiring.

3. Oil Cleanliness Management

The MCV116A3204 pilot stage features extremely tight clearances (double-nozzle flapper gaps typically in the micron range) and demands high oil cleanliness. Recommended system cleanliness: ISO 4406 Class 18/16/13 or higher. Install high-precision filters (filtration rating ≤10μm) in the system return line and inspect filter elements regularly.

4. Installation Torque and Sealing

Use a torque wrench to tighten mounting bolts to the values specified in Danfoss technical manuals. Use OEM-specification O-rings for sealing—inspect seal condition prior to installation and replace if worn or damaged. Do not apply excessive sealant, as sealant debris may enter the valve body.

5. System Commissioning and Calibration

After replacing the MCV116A3204 control valve, recalibrate the pump displacement control. Conduct preliminary commissioning at low pressure and low speed to verify that the proportional relationship between the 4–20 mA control signal and pump displacement output meets expectations. Gradually load to rated conditions while monitoring system response for smooth operation, oscillation, or hysteresis.

6. Periodic Maintenance and Inspection

Perform functional checks every 2,000 operating hours or annually, including: linearity verification between control signal and displacement output, response time testing, and leakage inspection. If sluggish response, non-linear behavior, or increased leakage is observed, arrange for servicing or replacement.