D656-301 Series D 656PQ-Proportional Control Valves

With more than 15000 valves deli-vered,the MOOG PQ-ProportionaControl Valves Series D651 haveproved to

be reliable in manyapplications of pressure control.The experience gained there hashelped to develop the second walvegeneration Series D656
New valve bodies for higher
valve flow
Optional external pilot flow over Xand Y
Optional new pilot stage usingjet-pipe principle
Greater robustness throughlonger spool stroke
Improved integrated valveelectronics
4-way PQ-Valve available
The MOOG PQ-Proportional ControlValve is a dual function valve forprecise and fast control of both fluidflow and

pressure. it is a compactunit with integrated electronics andtransducer(LVDT) for spool positioncontrol and integrated

electronicsand pressure transducer for pressurecontrol, which can be optimized forthe individual application.A PQ.

Proportional Control Valve canreplace several conventional valvesin hydraulic systems in order to fulfiland improve the same functions.

D656-301

Advantages of the Pa-ProportionalControl Valve
Compact unit for fast and precisecontrol of fluid flow and pressurethus allowing a simplification ofhydraulic systems.
With integrated electronics, com-pletely assembled, adjusted andtested as complete unit. Thishelps to ease installation and ser.vice by the end user.
High resolution of valve flowfunction through electricallyclosed loop.This increases thereproduceability.
Electronic pressure control orpressure relief control with highprecision,independent of valvefiow.
Extended range of rated flow forapplication in main line(meter-inmode) and by-pass line (bleed.offmode) through hydraulic doubleflowW.
Low electricat driving power.Robust pilot stage which has pro-ven reliable for many years.
Optional: New pilot stage usingjet-pipe amplifier with lower pilotleakage flow for equivalent usefulpilot flow and with improvedpressure gain.
High driving forces which ensurereliable movement of the spool.Wide adjusting range forpressure setting(minimalpressure only limited by returnpressure).