Sand-vik 55194637 Safety Proportional Valve

1. Basic Information

• Part Number: 55194637 (Full code: 551 94637)
• Brand: Sand-vik
• Type: Proportional pressure relief valve with safety unloading function
• Applicable Models:
  • DD Series: DD2100, DD2710, DD3110 and other underground development drill rigs
  • DL Series: DL2100, DL2710 and other longhole drill rigs
  • Matched equipment: Hydraulic circuits of RDX5 hydraulic rock drills
  
  

2. Core Functions

• Proportional pressure regulation: Receives 0–10V DC or 4–20mA electrical signals to adjust system pressure continuously and linearly.
• Safety relief: Releases pressure proportionally when overloaded, protecting hydraulic pumps, motors, rock drills and other precision components.
• Load sensing: Automatically adjusts pressure according to working load to save energy and reduce heat generation.

3. Key Specifications

• Working Pressure: 0–350 bar (Max regulating pressure: 350 bar)
• Flow Range: 2–80 L/min
• Input Signal: 0–10V DC or 4–20mA
• Coil Voltage: 24V DC (standard for drill rigs)
• Material: High-strength carbon steel valve body, hardened valve spool, FKM rubber seals
• Operating Temperature: -30℃ ~ +120℃
• Installation: Cartridge type, fits standard valve cavities

4. Appearance & Structure

• Cylindrical black cartridge valve body with a proportional solenoid mounted on the top.
• Integrated assembly consisting of valve spool, spring and proportional solenoid, equipped with O-ring seals.
• Original marking: Part number 55194637, Sand-vik logo, voltage and pressure parameters.

5. Replacement & Compatibility

• Genuine replacement: 55194637 (single standard model, no upgraded variants)
• Interchangeability: Not compatible with Epiroc 606001108 or other similar parts due to different brands, port sizes and control logic.
• Installation position: Main hydraulic valve block, for pressure control circuit of rock drills.

6. Common Faults & Maintenance

• No pressure output: Burnt coil, stuck valve spool or signal loss.
• Unstable pressure: Contaminated hydraulic oil, worn seals or faulty proportional amplifier.
• Maintenance cycle: Inspect every 500 working hours. Replace hydraulic oil, clean filter elements and regularly check coil insulation.