Servo and proportional valve repair for over 20 years
A failed servo or proportional valve can stop a press, a molding machine or a whole line. AST has repaired servo and proportional hydraulics for more than 20 years. We disassemble, inspect, clean, rebuild, calibrate and dynamically test every valve to OEM specifications. Our valve inventory makes same-day repair possible on many popular models.
- Rush same-day repair on most valve types
- Factory-trained technicians
- OEM-authorized repair facility
- Valves calibrated to OEM or customer specifications
- Full testing on custom hydraulic test stands
- Large inventory of remanufactured valves
- Proprietary 3-stage cleaning system
- 1-year in-service warranty
Servo valves vs. proportional valves
Servo valves give very precise position, speed and closed-loop motion control. They're common in aerospace, injection molding and high-precision manufacturing.
Proportional valves give simpler, more economical control of flow and pressure. They're common in packaging, material handling and food processing equipment.
Signs a valve needs repair
- Inconsistent actuator movement
- Slow machine response
- Positioning errors
- Pressure fluctuations
- Excessive heat
- Servo instability or hunting
- Unexpected alarms
- Fluid contamination
- External leakage
- Complete loss of motion
Valve brands we commonly repair
Bosch Rexroth valves used in automation, injection molding and machine tools. Moog high-performance servo valves. Parker valves for machinery, mobile equipment and packaging. Vickers valves for presses and heavy equipment. HR Textron valves in industrial hydraulic systems.