RA 26 928/06.98
RA 26 928/06.98
Pressure reducing valve,
pilot operated,
Model 3DR
H/A/D 5844/97
Nominal size 16
Series 5X
Maximum operating pressure 3600 PSI (250 bar)
Maximum flow 58.1 GPM (220 L/min)
Model 3DR 16 P5-5X/250Y/00M
Contents
Features
Description
Features
Ordering details
Function, section, symbol
Technical data
Characteristic curves
Unit dimensions
Page
1
1
2
3
3, 4
5
– 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 4401-7, NFPA T 3.5.1 M R1,
and ANSI B 93.7 D 07
Subplates, see datasheet RA 45 056 (separate order)
– 4 pressure stages
– 4 adjustment elements:
• Handknob
• Screw adjustment with locknut and protective cap
• lockable handknob with scale
• Handknob with scale
Ordering details
3DR 16 P
–5X
Y 00
*
Further details in clear text
3-way pressure reducing valve
Size 16, NFPA D 07
M=
V=
= 16
Subplate mounting
Adjustment element
Handknob
Screw adjustment with locknut and protective cap
Lockable handknob with scale
Handknob with scale
Series 50 to 59
(50 to 59: externally interchangeable)
Maximum adj. pressure up to 725 PSI (50 bar)
Maximum adj. pressure up to 1450 PSI (100 bar)
Maximum adj. pressure up to 2901 PSI (200 bar)
Maximum adj. pressure up to 3626 PSI (250 bar)
=P
NBR seals
FPM seals
(other seals on request)
Attention!
The compatibility of the seals and
pressure fluid has to be taken into account!
=4
=5
= 6 1)
=7
00 =
= 5X
= 50
= 100
= 200
= 250
1/6
Y=
1)
without stroke limiter
Pilot oil supply
internal pilot,
external drain
H-key with part no. 00008158
is included within the scope of supply
RA 26 928/06.98
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.
7
11
12
10
3
14
1
5
9
Model 3DR 16 P4-5X/…
X
6
T
A
P
Y
B
2
8
13
4
Symbol
P
T
M
A
Rexroth Hydraulics
Y
2/6
3DR
RA 26 928/06.98
Technical data (for applications outside these parameters, please consult us!)
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 4401-7, NFPA T 3.5.1 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
°F (°C)
Ambient temperature range
–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)
mineral oil (HL, HLP) to DIN 51 524 1);
fast bio-degrable pressure fluids to
VDMA 24 568 (also see RA 90 221); HETG (rape seed oil) 1);
HEPG (polyglycol) 2); HEES (synthetic ester) 2);
other pressure fluids on request
Pressure fluid
1)
suitable for NBR and FPM seals
only suitable for FPM seals
Pressure fluid temperature range
2)
°F (°C)
–22 to +176 (–30 to +80) with NBR seals
°F (°C)
–4 to +176 (–20 to +80) with FPM seals
(mm2/s)
Viscosity range
SUS
Maximum flow
GPM (L/min)
45 to 3720 (10 to 800)
58.12 (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 ß10 ≥ 75.
Output pressure in PSI (bar) →
Characteristic curves measured at ν = 190 SUS (41 mm2/s) and t = 122 °F (50 °C)
4350
(300)
3625
(250)
2900
(200)
2175
(150)
1450
(100)
725
(50)
Output pressure pA in relationship to the flow qV
The characteristic
curves are valid for
output pressure
pT = zero over the
entire flow range.
(220) (200)
(160)
(120)
(80)
58.2 52.8
42.3
31.7
21.2
(40)
0
(40)
(80)
(120)
(160)
(200) (220)
10.6
0
10.6
21.2
31.7
42.3
52.8 58.2
Flow in GPM (L/min) →
A to T
3DR
P to A
3/6
Rexroth Hydraulics
RA 26 928/06.98
Characteristic curves measured at ν = 190 SUS (41 mm2/s) and t = 122 °F (50 °C)
Pressure in port A in PSI (bar) →
Flow resistance (∆p through housing)
203
(14)
174
(12)
145
(10)
116
(8)
87
(6)
58
(4)
29
(2)
(220) (200)
(160)
(120)
(80)
58.2 52.8
42.3
31.7
21.2
(40)
0
(40)
(80)
(120)
(160)
(200) (220)
10.6
0
10.6
21.2
31.7
42.3
52.8 58.2
Flow in GPM (L/min) →
Pressure in port A in PSI (bar) →
A to T
P to A
Minimum setable pressure pmin in relationship to the flow qV
218
(15)
145
(10)
72.5
(5)
Input pressure at
actuator A is dependent
on the system
(220) (200)
(160)
(120)
(80)
58.2 52.8
42.3
31.7
21.2
(40)
0
(40)
(80)
(120)
(160)
(200) (220)
10.6
0
10.6
21.2
31.7
42.3
52.8 58.2
Flow in GPM (L/min) →
P to A
A to T
Pilot flow in port Y in GPM (L/min) →
The characteristic curves are valid for output pressure pT = zero over the entire flow range.
0.370
(1.4)
0.317
(1.2)
0.264
(1.0)
0.211
(0.8)
0.159
(0.6)
0.106
(0.4)
0.053
(0.2)
Pilot flow qV St in relationship to the flow qV
∆p = 300 bar
pA = 300 bar
pA = 50 bar
∆p = 50 bar
(220) (200)
(160)
(120)
(80)
58.2 52.8
42.3
31.7
21.2
(40)
0
(40)
(80)
(120)
(160)
(200) (220)
10.6
0
10.6
21.2
31.7
42.3
52.8 58.2
Flow in GPM (L/min) →
A to T
Rexroth Hydraulics
P to A
4/6
3DR
RA 26 928/06.98
Unit dimensions: dimensions in inches (millimeters)
0.063 (1.6)
4 (101.6)
6
B Y
5.51 (140)
3.78 (96)
A
7; 8
Ø 1.26 (32)
5
9 8
4
0
2
Ø 0.433 (11)
1.97 (50)
Ø 1.38 (35)
13
Ø 0.73 (18.5)
Ø 0.26 (6.6)
3
4 (101.6)
6.22 (158)
Ø 0.433 (11)
2 1
Y
Ø 1.56 (39.5)
1.142 (29)
B
1.34 (34.1)
2.75 (69.9)
0.063 (1.6) 1.38 (35)
A
X
3.58 (91)
L
11
P
T
2.75 (69.9)
0.472 (12)
14
3.7 (94)
12
43
1.34 (34)
3
0.748 (19)
1.42 (36)
1.42 (36)
6.063 (154)
1
~ 8.98 (228)
0.709 (18)
~ 9.84 (250)
10
1
2
3
4
5
6
7
8
9
Name plate
Pilot control valve
Main valve
Adjustment element “5”
Hexagon A/F 10
Adjustment element “4”
Adjustment element “6”
Adjustment element “7”
O-rings 0.394 x 0.079 (10 x 2)
for ports X, Y and L
10 O-rings 0.866 x 0.098 (22 x 2.5)
for ports A, B, P and T
11 Port X has to be plugged
in the subplate.
3DR
9
12 Ports B and L have to be plugged in the
subplate.
13 Pressure gauge connection
14 Valve mounting surface,
porting pattern to ISO 4401-7, NFPA T
3.5.1 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 45 056, must be ordered
separately.
Valve mounting bolts
4) 3/8“-16 x 2-1/4“ UNC
4) M10 x 2.36 (60) DIN 912-10.9,
MA = 53.84 lb-ft (73 Nm),
2) 1/4“-20 x 2-1/4“ UNC
2) M6 x 2.36 (60) DIN 912-10.9,
MA = 11.43 lb-ft (15.5 Nm),
must be ordered separately.
0.0004/4.0 in
0.01/100 mm
32
(Rmax 4)
Required surface finish of
interface when mounting
without our subplate
5/6
Rexroth Hydraulics
RA 26 928/06.98
Notes
Mannesmann Rexroth Corporation
Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467
Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333
3DR
6/6
All rights reserved – Subject to revision
Printed in U.S.A.