G040-123 Portable Valve Checker

The G040-123 is derived from the M040-120 P/Q Valve Tester. It provides field checking of the complete range of Moog electrical feedback (e.f.b.) valves, both proportional and servo, that have spool position control (Q) only. For valves with spool position (Q) and pressure control (P), use M040-120.

It is connected “in-line” between the plant electronics and the valve so checking of the valve is made without removing it from the plant, so that hydraulic and electronic problems can be isolated. The checker operates in two modes: “Checker” and “Plant”.


  • Provides testing hydraulics independent of electronics
  • Field checks most Moog Electrical Feedback (EFB) valves
  • In-line operation
  • Lightweight and portable
  • Built-in LED spool read-out
  • Fixed cables and connectors
  • Models available for specific connector/supply combinations
  • Test points to monitor command and spool signals
  • Standardized 10V representation of command and spool, regardless of actual signal type
  • CE marked and EN 60204-1 compliant


  • Assists in the commissioning and testing of Moog Electrical Feedback (EFB) servovalves, servo-proportional valves and direct drive valves
  • Rapid problem identification
  • Minimizes machine downtime

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