Hydraulic Components Classification, Technical Guide-3

1

Piston Pump

PVQ13-A2R-SE1S-20-C14-12

Pump body: High-strength cast iron (HT250); Pistons: Alloy steel (40Cr) with chrome plating; Valve plate: Copper alloy (ZCuSn10Pb1) for wear resistance and sealing performance.

1. Wear of piston and cylinder bore due to impure hydraulic oil (containing metal particles or debris); 2. Valve plate damage caused by long-term high-pressure operation and uneven force; 3. Seal aging due to high temperature and oil oxidation.

1. Use hydraulic oil that meets ISO 4406 Class 16/13 standard, and replace the oil filter every 200 working hours; 2. Avoid long-term operation at maximum pressure (not exceeding 80% of rated pressure for extended periods); 3. Check oil temperature regularly (keep it between 30-60℃) to prevent seal aging.

2

Axial Piston Pump

A10VSO10DR/52R-PPA14NOO

Pump body: Aluminum alloy (ADC12) for light weight and heat dissipation; Rotor: Alloy steel (35CrMo) with nitriding treatment; Swash plate: Wear-resistant alloy steel (40CrNiMo) with surface hardening.

1. Rotor and swash plate wear caused by insufficient lubrication or low-quality hydraulic oil; 2. Bearing damage due to high-speed rotation and foreign matter intrusion; 3. Pressure shock leading to swash plate deformation.

1. Ensure sufficient hydraulic oil supply before starting the pump, and check lubrication status regularly; 2. Install a pressure relief valve to avoid system pressure shock (comply with DIN 24337 standard); 3. Clean the pump inlet filter monthly to prevent foreign matter from entering.

1

Flow Control Valve

LT07MKA-2X/100/02M

Valve body: Carbon steel (45#) with galvanizing treatment; Spool: Alloy steel (40Cr) with precision grinding; Seal ring: Nitrile rubber (NBR) for oil resistance and high-temperature resistance.

1. Spool wear caused by impure hydraulic oil and long-term reciprocating movement; 2. Seal damage due to high temperature and oil oxidation; 3. Valve body corrosion from moisture in hydraulic oil.

1. Regularly filter hydraulic oil to remove impurities (particle size ≤ 10μm); 2. Avoid frequent rapid adjustment of the spool to reduce wear; 3. Check the valve body for corrosion every quarter and apply anti-corrosion lubricant if needed.

2

Flow Control Valve

LT05MKA-31/100/02M

Valve body: Carbon steel (45#) with galvanizing treatment; Spool: Alloy steel (40Cr) with precision grinding; Seal ring: Nitrile rubber (NBR) for oil resistance and high-temperature resistance.

1. Spool jamming and wear caused by foreign matter in hydraulic oil; 2. Seal aging due to long-term contact with high-temperature oil; 3. Valve stem deformation caused by improper adjustment force.

1. Replace hydraulic oil every 500 working hours and clean the oil tank; 2. Adjust the valve stem with uniform force, avoiding excessive torque; 3. Store the valve in a dry, clean environment when not in use to prevent moisture intrusion.

1

Directional Control Valve

DG17V-3-2N-60

Valve body: Alloy steel (35CrMo) for high strength; Spool: Stainless steel (304) for corrosion resistance; Solenoid coil: Copper wire with insulation layer (PVC) for heat resistance.

1. Spool wear caused by long-term switching and hydraulic oil impurities; 2. Solenoid coil burnout due to overvoltage or poor heat dissipation; 3. Seal leakage caused by aging and high pressure.

1. Ensure the power supply voltage matches the coil rated voltage (avoid overvoltage by ±10%); 2. Clean the valve spool every 300 working hours to remove impurities; 3. Check the solenoid coil temperature during operation (not exceeding 70℃).

2

Directional Control Valve

DG18V-3-2AL-B-60

Valve body: Alloy steel (35CrMo) for high strength; Spool: Stainless steel (304) for corrosion resistance; Solenoid coil: Copper wire with insulation layer (PVC) for heat resistance.

1. Spool jamming caused by foreign matter in hydraulic oil; 2. Seal damage due to high pressure and long-term use; 3. Solenoid coil damage due to moisture intrusion (in humid working environments).

1. Install a moisture-proof cover for the solenoid coil in humid scenarios; 2. Check the system pressure regularly (not exceeding the valve’s rated pressure of 60MPa); 3. Replace the seal ring every 400 working hours to prevent leakage.

3

Directional Control Valve

4WP6D6X/N

Valve body: Cast iron (HT200) for stability; Spool: Alloy steel (40Cr) with chrome plating; Seal ring: Fluorine rubber (FKM) for high-temperature and oil resistance.

1. Spool wear caused by long-term switching and hydraulic oil impurities; 2. Valve body cracking due to pressure shock; 3. Seal leakage caused by high-temperature oil aging.

1. Install a buffer valve to reduce system pressure shock; 2. Use hydraulic oil with a temperature resistance of ≥ 120℃ to avoid seal aging; 3. Check the valve body for cracks monthly (using non-destructive testing methods).

1

Pressure Reducing Valve

DRE6-10/100MG24K4M

Valve body: Carbon steel (45#) with heat treatment; Pressure regulating spool: Alloy steel (40CrNiMo); Spring: High-carbon steel (65Mn) for elastic stability.

1. Spool wear caused by high-pressure oil impact and impurities; 2. Spring fatigue deformation due to long-term compression; 3. Seal damage due to high temperature and oil oxidation.

1. Adjust the pressure gradually (not exceeding 1MPa per adjustment) to avoid spring damage; 2. Replace the spring every 800 working hours to prevent fatigue failure; 3. Use hydraulic oil with good oxidation resistance (comply with ISO 6743/4 standard).

2

Pressure Reducing Valve

3WH6B53/

Valve body: Alloy steel (35CrMo) for high pressure resistance; Spool: Stainless steel (316) for corrosion resistance; Seal ring: Fluorine rubber (FKM) for high-temperature resistance.

1. Spool jamming caused by foreign matter in hydraulic oil; 2. Valve body wear due to long-term high-pressure operation; 3. Seal leakage caused by improper installation.

1. Clean the hydraulic oil system thoroughly before installing the valve; 2. Check the valve’s pressure stabilization performance monthly (pressure fluctuation ≤ ±0.5MPa); 3. Install the valve correctly, ensuring the flow direction matches the system design.

1

What type of hydraulic oil should be used with the PVQ13-A2R-SE1S-20-C14-12 piston pump?

It is recommended to use hydraulic oil that meets ISO 4406 Class 16/13 standard (cleanliness level) and ISO 6743/4 viscosity grade (46# or 68# anti-wear hydraulic oil). Avoid using mixed or low-quality oil, as it will accelerate pump wear and reduce service life.

2

How often should the seal rings of directional control valves (DG17V-3-2N-60 and DG18V-3-2AL-B-60) be replaced?

Under normal operating conditions (30-60℃ oil temperature, clean hydraulic oil), replace the seal rings every 400 working hours. If the system has oil leakage, abnormal temperature rise, or harsh working environments (humid, dusty), shorten the replacement cycle to 300 working hours.

3

Why does the DRE6-10/100MG24K4M pressure reducing valve have unstable pressure, and how to fix it?

Unstable pressure is usually caused by three reasons: 1. Hydraulic oil impurities jamming the spool; 2. Spring fatigue deformation; 3. System pressure shock. Fixes: Clean the spool and filter, replace the spring if fatigued, and install a buffer valve to reduce pressure shock.