Pressure reducing valve, pilot operated, Model 3DR

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1 RA /06.98 Pressure reducing valve, pilot operated, Model 3DR Nominal size 16 Series 5X Maximum operating pressure 3600 PSI (250 bar) Maximum flow 58.1 GPM (220 L/min) Contents Description Page Features 1 Ordering details 1 Function, section, symbol 2 Technical data 3 Characteristic curves 3, 4 Unit dimensions 5 Ordering details H/A/D 5844/97 Model 3DR 16 P5-5X/250Y/00M Features Valve for the reduction (P to A) and limitation (A to T) of pressure in a hydraulic system For subplate mounting, porting pattern to ISO , NFPA T M R1, and ANSI B 93.7 D 07 Subplates, see datasheet RA (separate order) 4 pressure stages 4 adjustment elements: Handknob Screw adjustment with locknut and protective cap lockable handknob with scale Handknob with scale 3DR 16 P 5X Y 00 * 3-way pressure reducing valve Size 16, NFPA D 07 = 16 Subplate mounting = P Adjustment element Handknob = 4 Screw adjustment with locknut and protective cap = 5 Lockable handknob with scale = 6 1) Handknob with scale = 7 Series 50 to 59 = 5X (50 to 59: externally interchangeable) Maximum adj. pressure up to 725 PSI (50 bar) = 50 Maximum adj. pressure up to 1450 PSI (100 bar) = 100 Maximum adj. pressure up to 2901 PSI (200 bar) = 200 Maximum adj. pressure up to 3626 PSI (250 bar) = 250 Further details in clear text M = NBR seals V = FPM seals (other seals on request) Attention! The compatibility of the seals and pressure fluid has to be taken into account! 00 = without stroke limiter Pilot oil supply Y = internal pilot, external drain 1) H-key with part no is included within the scope of supply 1/6

2 Function, section, symbol Valve model 3DR is a pilot operated 3-way pressure reducing valve with pressure limitation in the secondary circuit. It is used to reduce pressure in a hydraulic system. The pressure reducing valve consists of main valve (1) with control spool (2) and pilot control valve (3) with adjustment element (10). At rest the valve is open. Flow is unrestricted from port P to port A. The pressure in port A is permitted via the bore (4) to the spool area opposite to compression spring (9). Pressure is applied via orifice (6) to the spring loaded side of the control spool (2) and via channel (5) to ball (7) in pilot control valve (3). Dependent on the setting of compression spring (11), pressure builds up in front of ball (7) and in channel (5) which holds control spool (2) in an open position. Flow continues from port P via control spool (2) into port A, until pressure in port A exceeds the value set at compression spring (11) and lifts ball (7). Control spool (2) moves closed. The required reduced pressure is achieved when a balance between the pressure in port A and the value set at compression spring (11) is reached. If pressure in port A continues to rise at the actuator through external forces, control spool (2) moves further against compression spring (9). Port A is connected to port T via control lands (8) at control spool (2). Fluid passes to tank to ensure that pressure does not rise any further. Pilot oil return from spring chamber (12) is always external via control line (13) to port Y. This must always remain at zero pressure to tank. Pressure gauge connection (14) makes it possible to monitor the reduced pressure in port A Model 3DR 16 P4-5X/ X T A P B Y Symbol P T M A Y Rexroth Hydraulics 2/6 3DR

3 Technical data (for applications outside these parameters, please consult us!) RA /06.98 General Description pressure reducing valve Graphic symbol see page 2 Model code see page 1 Mounting style subplate mounting Connection model indirect connection via subplate or manifold block, porting pattern to ISO , NFPA T M R1, and ANSI B 93.7 D 07 Nominal size 16 Weight lbs (kg) 17.6 (8.0) Installation optional Direction of flow see graphic symbol on page 2 Ambient temperature range F ( C) 22 to +122 ( 30 to +50) Hydraulic data Nominal pressure PSI (bar) 4500 (315) Maximum operating pressure at port P PSI (bar) 4500 (315) Maximum operating pressure at port A PSI (bar) 3600 (250) Maximum operating pressure at port Y PSI (bar) separate and at zero pressure to tank Setable pressure minimum PSI (bar) dependent on the flow (see characteristic curves on page 4) maximum PSI (bar) 725 (50); 1450 (100); 2901 (200); 3626 (250) Pressure fluid mineral oil (HL, HLP) to DIN ) ; fast bio-degrable pressure fluids to VDMA (also see RA ); HETG (rape seed oil) 1) ; 1) suitable for NBR and FPM seals 2) only suitable for FPM seals HEPG (polyglycol) 2) ; HEES (synthetic ester) 2) ; other pressure fluids on request Pressure fluid temperature range F ( C) 22 to +176 ( 30 to +80) with NBR seals F ( C) 4 to +176 ( 20 to +80) with FPM seals Viscosity range SUS (mm 2 /s) 45 to 3720 (10 to 800) Maximum flow GPM (L/min) (220) Degree of contamination maximum permissible degree of contamination of the pressure fluid is to NAS 1638 class 9. We, therefore, recommend a filter with a minimum retention rate of ß Characteristic curves measured at ν = 190 SUS (41 mm 2 /s) and t = 122 F (50 C) Output pressure in PSI (bar) Output pressure p A in relationship to the flow q V (300) (250) (200) (150) (100) (50) The characteristic curves are valid for output pressure p T = zero over the entire flow range. A to T P to A 3DR 3/6 Rexroth Hydraulics

4 Characteristic curves measured at ν = 190 SUS (41 mm 2 /s) and t = 122 F (50 C) 203 Flow resistance ( p through housing) (14) Pressure in port A in PSI (bar) (12) (10) (8) (6) (4) (2) A to T P to A 218 (15) Minimum setable pressure p min in relationship to the flow q V Pressure in port A in PSI (bar) (10) (5) Input pressure at actuator A is dependent on the system A to T P to A The characteristic curves are valid for output pressure p T = zero over the entire flow range. Pilot flow in port Y in GPM (L/min) Pilot flow q V St in relationship to the flow q V (1.4) p A = 300 bar p = 300 bar (1.2) (1.0) (0.8) (0.6) (0.4) (0.2) p A = 50 bar p = 50 bar A to T P to A Rexroth Hydraulics 4/6 3DR

5 Unit dimensions: dimensions in inches (millimeters) (1.6) 1.34 (34.1) Ø (11) Ø 0.73 (18.5) Ø 0.26 (6.6) Ø (11) 2.75 (69.9) L T A P X B Y 3.7 (94) 4 (101.6) 6.22 (158) ; 8 Ø 1.38 (35) Ø 1.56 (39.5) Ø 1.26 (32) 3.58 (91) A B Y 1.34 (34) 3.78 (96) 5.51 (140) (69.9) 1.38 (35) (12) (29) (1.6) 1.97 (50) 4 (101.6) (36) (19) (154) 1.42 (36) 1 ~ 8.98 (228) ~ 9.84 (250) (18) Name plate 2 Pilot control valve 3 Main valve 4 Adjustment element 5 5 Hexagon A/F 10 6 Adjustment element 4 7 Adjustment element 6 8 Adjustment element 7 9 O-rings x (10 x 2) for ports X, Y and L 10 O-rings x (22 x 2.5) for ports A, B, P and T 11 Port X has to be plugged in the subplate. 12 Ports B and L have to be plugged in the subplate. 13 Pressure gauge connection 14 Valve mounting surface, porting pattern to ISO , NFPA T M R1, and ANSI B 93.7 D 07 Subplates G172/01 (G 3/4), G172/12 (SAE 12; 1-1/16-12) G 174/01 (G 1), G174/12 (SAE 16; 1-5/16-12) See RA , must be ordered separately. Valve mounting bolts 4) 3/8-16 x 2-1/4 UNC 4) M10 x 2.36 (60) DIN , M A = lb-ft (73 Nm), 2) 1/4-20 x 2-1/4 UNC 2) M6 x 2.36 (60) DIN , M A = lb-ft (15.5 Nm), must be ordered separately /4.0 in 0.01/100 mm 32 (R max 4) Required surface finish of interface when mounting without our subplate 3DR 5/6 Rexroth Hydraulics

6 Notes Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA Tel. (610) Fax: (610) Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH Tel. (330) Fax: (330) DR 6/6 All rights reserved Subject to revision Printed in U.S.A.

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