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Spool Type (CKE, DMO)
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2-Way Spool Type Pressure Reducing Valve Series D (01/2011) 2-Way Spool Type Pressure Reducing Valve (DMO) ISO 7368 NB16-NB50 General Description 2-way pressure reducing valves are used to reduce a variable input pressure (primary pressure at B) to a lower, constant output pressure (secondary pressure at A). The reduced pressure can be set using a pressure relief valve on the valve cover. Depending on configuration, this valve can also function as a pressure compensator. The preferred mode of mounting is the manifold block which, depending on the hydraulic circuit for the specific application, can be equipped with several interconnected valves. The valves are available as “normally open” or “normally closed” versions. Benefits • Maximum operating pressure: 350 bar • Improved flow characteristics compared to series B • Can be used with standard series D covers (RM or 1W) • Available in multiple configurations WHAT MOVES YOUR WORLD

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Operating Principle A DMO type pressure reducing valve is a spool type valve without an effective surface in port B. The effective surfaces in port C and in operational port A are of equal size (surface ratio 1:1). The flow direction is from B to A. As port B is pressurized, oil will flow from B to A. As the pressure in port A approaches the set pressure value of the limiting valve, the spool will move towards the closed position throttling the oil flow. As the pressure in port A exceeds the set pressure value, the spool will close port A and the oil flow will be interrupted. Depending on...

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(1) Pressure reducing valve - Standard RM cover - Pilot oil supplied over port X - Pilot oil tap on port A - Without sandwich cover (max 3 bar spring) - NB 16 to NB 40 (2) Pressure reducing valve - Standard RM cover - Pilot oil supplied over port X - Pilot oil tap on port A - With sandwich cover for 8 bar spring - NB 16 to NB 40 (NB 50 with 3 bar spring) (3) Pressure reducing valve - Standard 1W cover - Pilot oil supplied over 2-way flow controller - Pilot oil tap on port B - Y port connected to tank - NB 16 to NB 50 - Higher flow rates possible compared to configurations (1) and (2) (4)...

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Characteristic Curves Conditions: system pressure 350 bar, oil temperature 40 oC, oil viscosity 32 cSt (Blue = performance limit with 3 bar spring, Red = performance limit with 8 bar spring)

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WHAT MOVES YOUR WORLD

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1 Dimension B1 is larger than specified by ISO 7368 2) NB50 delivered standard with sandwich cover (H1=166 mm) 3) For NB50 with 0,5 bar spring subtract 60 mm from dimension given WHAT MOVES YOUR WORLD

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Option: Sandwich cover for 8 bar spring NB16...NB40 (NB50 using max. 3 bar spring) Option: 2-way flow control (NB06) using a sandwich plate (weight 1,25 kg)

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Alternative Configurations Alternative configurations for pilot valves that do not use port A. It is recommended that pilot valves with no connection to port A be used in combination with a sandwich plate (P connected to A). Standard: Moog DB pilot valve + RM cover Alternative: DB pilot valve + sandwich cover + RM cover Sandwich plate RM cover Valve configurations using a flow control sandwich plate, regardless of pilot valve; do not require any special sandwich plates. Option: Sandwich cover (NB06) with connections from P and A (weight 0,7 kg) WHAT MOVES YOUR WORLD

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Ordering Information Ordering Information Order Example 2/2-Way pressure reducing valve, NB 32, manual pressure adjustment, normally open A10: orifice 1,0 in port A of the cover P12: orifice 1,2 in port P of the cover B: spring pilot valve 0 - 70 bar M: function „normally open“ 2: adjustment method 2 Allen head screw with jam nut X: pilot oil supply X and Y through mounting surface WHAT MOVES YOUR WORLD

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Order Numbers Pressure reducing valve with 3 or 8 bar spring (RM cover) WHAT MOVES YOUR WORLD

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Global Support As a recognized leader in motion control technologies, Moog offers a full range of services to support our products and ensure that they meet the expectations of customers. Moog experts are the best at helping customers select the right products and ensuring that they run reliably for a long time. When it is time for new machine commissioning, refurbishment or routine maintenance, our engineers can help to optimize machine performance, minimize downtime and ensure the smooth application of our products. Moog Authentic Repair ServiceTM is designed to provide the highest...

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