13
DGMX2 Pressure Reducing/Relieving Valves
General Description
These two-stage spool valves maintain
a reduced outlet pressure against
variations in inlet pressure.
These valves are able to act as relief
valves (at 50% of maximum flow) to
prevent excess pressure being
developed when an actuator is subject
to a reactive load. Relief flow is directed
to the “T
B
” port. Therefore, for the relief
function to operate, all components
above this DGMX2 module must contain
the “T
B
” port, and the directional valve
must have the “T
B
” bypass feature.
Pilot control may be from the “P”, “A”, or
“B” port. Pilot drain flow may be directed
internally to tank port “T
A
”, or externally
out of the valve body.
Any pressure in the line to which these
valves are drained is additive to the
valve pressure setting.
The valve pressure setting is adjustable
by means of either an adjusting screw
containing an internal hex, a
hand-adjust knob, or a micrometer knob
with keylock.
Different spring ratings cover an overall
pressure range from 2 to 315 bar
(30-4500 psi).
The metering spool element in this
design is always positioned in the “P”
line (see symbols on page14). The
connection of the pilot control line
determines at which port the reduced
pressure is obtained. For example:
“PP” pilot for reduced pressure
in “P” port
“PA” pilot for reduced pressure
in “A” port
“PB” pilot for reduced pressure
in “B” port
The “A” and “B” line models provide for
reduced pressure when “P” is connected
to “A” or “B”. It allows free flow through
the service port when connected to “T”
(all via a four-way directional valve).
3 45 87691 2
Model Code
1
2
Valve function
Manifold or subplate mounted
reducing/relieving valve.
Interface
5 - ISO 4401-AC-05-4-A, CETOP 5
RP35A size 5 ANSI/NFPA D05
5N - NFPA D05 (Alt. A)
5P - NFPA D05 (Alt. B)
Port operated upon
P -Pressure port
Pilot control
A - Cylinder port A
B - Cylinder port B
P - Pressure port
3
5
6
7
Pressure range
A - 2,0 to 50 bar (30 to 725 psi)
B - 8,5 to 100 bar (125 to 1450 psi)
F - 8,5 to 200 bar (125 to 2900 psi)
G - 8,5 to 315 bar (125 to 4500 psi)
Adjustment device
H - Knob adjuster
K - Micrometer knob with keylock
W - Screw with locknut
External drain
E - External drain
Omit for internal drain models.
Remote control
Omit if not required.
Gage port & thread type
Gage port (all models),
external drain (E)
B -G
1
/
8
” (
1
/
8
” BSPF)
S -SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread)
Design mumber - 30 series
Subject to change. Installation
dimensions unaltered for design
numbers 30 to 39 inclusive.
10
9
4
10
8
14
Functional Symbols
T
B
T
B
T
B
T
B
T
A
T
A
T
A
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PP-**-E-*-30 DGMX2-5-PA-**-E-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PP-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PB-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PB-**-E-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
PT
B
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PA-**-*-30
PT
B
P
P
T
B
T
B
B
B
A
A
DGMX2-5-PP-**-E-RC-*-30 DGMX2-5-PA-**-E-RC-30
P
P
T
B
T
B
T
A
B
B
A
A
DGMX2-5-PP-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PB-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PB-**-E-RC-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
PT
B
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5-PA-**-RC-*-30
PT
B
P
PT
B
T
A
T
A
B
B
A
A
DGMX2-5N-PP-**-*-30
X
X
Y
Y
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5N-PP-**-E-*-30
X
X
Y
Y
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5N-PA-**-*-30
PT
B
X
X
Y
Y
DGMX2-5N-PA-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
X
X
Y
Y
DGMX2-5N-PB-**-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
Y
Y
X
X
DGMX2-5N-PB-**-E-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
Y
Y
X
X
P
P
T
A
T
A
B
B
A
A
DGMX2-5P-PP-**-*-30
X
X
Y
Y
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5P-PP-**-E-*-30
X
X
Y
Y
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMX2-5P-PA-**-*-30
PT
B
X
X
DGMX2-5P-PA-**-E-*-30
PT
A
T
A
B
B
A
A
X
X
DGMX2-5P-PB-**-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
Y
Y
X
X
DGMX2-5P-PB-**-E-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
Y
Y
X
X
Y
Y
Y
Y
T
B
G
G
DR
G
G
DR
G
G
DR
RC
RC
DR
DR
G
G
G
G
G
G
DR
DR
DR
DR
DR
DR
DR
RC
G
G
G
G
G
G
G
G
G
G
G
G
RC
RC
RC
15
Operating Data
Basic Characteristics
Maximum flow: 120 l/min (32 USgpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pilot flow rate @ 50 C (120 F) and 315 bar (4500 psi): 290 - 420 ml/min (18-26 in
3
/min). . . . . . .
Leakage flow rate @ 50 C (120 F) and 315 bar (4500 psi): 80-200 ml/min (15-12 in
3
/min). . .
(Leakage to “Tb” around spool land
@315 bar (4500 psi) reduced pressure)
Maximum operating pressure: “A” models - 70 bar (1000 psi) * (inlet pressure) 50 bar (725 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(reduced pressure)
“B”, “F” & “G” models - 315 bar (4500 psi)
Weight: 3,5 kg (7.7 lbs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* Slightly higher pressure override characteristics between 70 bar (1000 psi) and 315 bar (4500 psi) inlet.
DGMX2 Insertion Lossess
Pressure bar
Pressure psi
200
150
100
4000
3000
2000
00
Flow l/min
Flow USgpm
20 40 60 80 100 120
51015202530
DGMX2 Pressure Override
50
1000
300
350
250
5000
Pressure Drop bar
Pressure Drop psi
15
10
100
0
0
Flow l/min
Flow USgpm
20 40 60 80 100 120
51015202530
5
50
25
20
150
200
250
300
350
These curves show the typical pressure
drop for each flow path in the valve. The “P” port
pressure drop is the pressure drop for flow across
the reducing valve spool in the fully open
condition. The total insertion loss for the valve
must be calculated by summing the losses
through each of the four flow paths.
“A” or
“B” port
“P” port
“T” port
These curves show the typical roll off or underride of the
different pressure ranges at maximum settings. Also
shown is the typical override of the relieving feature
which prevents undesirable pressure rise in the reduced
pressure port.
10 5 015
0204060
Relieving mode
Reducing mode
“G” max.
“F” max.
“B” max.
Pressure bar
Pressure psi
30
20
10
200
0
0
Flow l/min
Flow USgpm
20 40 60 80 100 120
5 1015 202530
400
“A” models
“B”, “F” & “G” models
DGMX2 Minimum Reduced Pressure
The curves (left) show the minimum reduced pressure
settings allowable for a given flow rate. The minimum
pressure setting applies regardless of inlet pressure.
Operation of the valve below minimum settings may
cause erratic valve operation due to insufficient spring
force to counter flow forces acting on the spool.
“A” min.
“B”, “F”, “G” min.
“A” max.
16
Installation Dimensions
48
(1.89)
Gage port
(See table)
4 mounting holes
∅ 6,90 (0.27) through
∅ 9,50 (0.37) counterbore
46,5 (1.83) deep for bolt extenders (order separately)
BKE-6M-60M (M6 metric) or BKE-4-60M (.2500-20 UNC).
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
DGMX2-5-PA/PB/PP
Reducing/Relieving Valves
30
(1.18)
50
(1.97)
“W” models (max. ext.)
Wrench size
11,5
(0.45)
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
13,5
(0.53)
131 (5.16)
37
(1.46)
11,7
(0.46)
28,4
(1.12)
69,5
(2.74)
71,6
(2.82)
max.
20,4
(0.80)
Adjust clockwise to increase
pressure setting.
Note: Back pressure in drain
is added to this setting for
internal drain models only.
T
B
B
P
A
T
A
mm (inches)
128 (5.04)
41,6
(1.64)
“S” models - SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread).
“B” models - G
1
/
8
(
1
/
8
BSPF)
External connection port threads
Gage port
(See table)
3rd angle
projection
13 (1/2”)
48
(1.89)
21,8
(0.86)
External drain port.
Plugged for internal
drain.(see table)
Remote control port.
(“RC” models only)
Hex key
4 (5/32”)
60
(2.36)
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.