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”. In “Checker” mode, commands to the valve come from the checker and the valve spool signal is monitored on the checker. The “Plant” command is disconnected and the spool signal is connected back to the plant electronics. In “Plant” mode, the checker is a monitor with the plant electronics commanding the valve and the spool signal passing back to the plant and also available for monitoring on the checker. Internal power is derived from the plant supply line to the valve or from an external 24V supply that connects to a front panel connector on the checker.

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