30
DGMPC Pilot Operated Check Valves
General Description
These valves are single or dual check
units. Dual check units have identical
check elements located in the “A” and
“B” cylinder port lines. The check
valve poppets are moved into the open
position by a central pilot control
spool which moves toward one check
or the other, depending on which port
is pressurized.
The check valve located in the return
circuit is opened by the operating
pressure in the primary circuit. When the
pressure in the pilot line is vented, the
check valve will remain closed.
The pilot spool area to valve seat ratio is
3:1 on standard models, and 20:1 on
models with the decompression feature.
Check valve cracking (opening)
pressures of 1 bar (15 psi), 2,5 bar
(36 psi) and 5 bar (73 psi) are available.
Please note that back pressure on the
downstream or free-flow side of the pilot
check valve may prevent the valve from
opening in certain situations. (Back
pressure opposes pilot pressure trying
to open the valve.) In such cases, pilot
pressure required to open the
decompression poppet and valve can be
calculated as follows:
To open valve or poppet in line A:
Pressure at B
1
=
P
A
+ P
C
- P
A1
Area ratio factor
+ P
A1
To open valve or poppet in line B:
Pressure at A
1
=
P
B
+ P
C
- P
B1
Area ratio factor
+ P
B1
Where:
P
A
= Pressure at A
P
C
= Cracking pressure
P
A1
= Pressure at A
1
P
B
= Pressure at B
P
B1
= Pressure at B
1
In the above cases, substitute
cracking pressure and area ratio from
the following:
Cracking pressure: 1, 2.5 or 5 bar
according to model code position 6
(and position 10 for second function).
Area ratio factors:
Standard valve: 3
Decompression poppet: 20
3 471 2
Model Code
1
2
Valve function
Manifold or subplate mounted check valve.
Interface
5 - ISO 4401-AC-05-4-A, CETOP
RP35H, Size 5 ANSI/NFPA D05
5N - NFPA D05 (Alt. A)
5P - NFPA D05 (Alt. B)
Decompression feaure
D - With decompression feature
Blank - Standard (no decompression)
Check port
A -Check in cylinder port “A”
B -Check in cylinder port “B”
(single check models only)
3
5
6
Pilot port
A -Pilot port controlling the “B” port
check (single check models only)
B -Pilot port controlling the “A” port check
Cracking pressure
K - 1,0 bar (15 psi)
M - 2,5 bar (35 psi)
N - 5,0 bar (75 psi)
Decompression feaure
D - Decompression feature
Blank- Standard (no decompression)
Omit for single check models.
Check port: second function
B – Check in cylinder port “B”
Omit for single check models.
Pilot port: second function
A -Pilot port controlling the “B” port
check (dual check models only)
Omit for single check models.
Cracking pressure:
second function
K - 1,0 bar (15 psi)
M - 2,5 bar (35 psi)
N - 5,0 bar (75 psi)
Omit for single check models.
Design number - 30 series
Subject to change. Installation
dimensions unaltered for design
numbers 30 to 39 inclusive.
9
5 6 8 9 10 11
4
7
8
10
11
31
Operating Data
A
P
P
T
DGMPC-5-BA*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5-AB*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5-AB*-BA*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5N-BA*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5N-AB*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5N-AB*-BA*-30
B
A
1
B
1
T
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
A
P
P
T
DGMPC-5P-BA*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5P-AB*-30
B
A
1
B
1
T
A
P
P
T
DGMPC-5P-AB*-BA*-30
B
A
1
B
1
T
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Functional Symbols
Basic Characteristics
Maximum flow rate: 120 l/min (32 USgpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum operating pressure: 315 bar (4500 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leakage @ 50 C (120 F)
Poppet @ 35 bar (500 psi)
Standard models 0.3 ml/min.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
“D” models 1.0 ml/min.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Piston @315 bar (4500 psi) 200 ml/min.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature: 20 C to 50 C (70 to 120 F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight: 2,9 kg (6.4 lbs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M
K
N
DGMPC Pressure Drop
Pressure drop bar
Pressure drop psi
6
4
00
Flow l/min
Flow USgpm
20 40 60 80 100 120
5 1015 202530
2
8
The curves below show pressure drop
through each functional flow path in the valve.
10
Model Type
Curve Number
DGMPC-5-(D)-AB*-30
PT A B
DGMPC-5-(D)-BA*-30
DGMPC-5-(D)-AB*-(D)-BA*-30
1
1
1
2
2
2
–
3
4
–
5
–
5
–
3
4
–
–
5
5
––
16
14
12
18
20
22
24
50
100
150
200
250
300
1
2
3
4
5
The total insertion loss for the valve must
be calculated by summing the losses
through the four applicable flow paths.
Flow toward actuator without ckeck – single check only
Flow from actuator without check – single check only
Use K, M, or N cracking pressure curve as applicable.
32
Installation Dimensions
30
(1.18)
50
(1.97)
9,9
(0.39)
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
13,5
(0.53)
128 (5.04)
37
(1.46)
11,7
(0.46)
33,2
(1.31)
71,6
(2.82)
max.
B
P
A
T
B
69,5
(2.74)
mm (inches)
4 mounting holes
∅ 6,9 (0.27) through
∅ 9,50 (0.37) counterbore
36,5 (1.44) deep
for bolt extenders
(order separately)
BKE-6M-50M (M6 metric) or
BKE-4-50M (.2500-20 UNC)
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
DGMPC-5-30
Pilot Operated
Check Valve
9,9
(0.39)
T
A
See page 38 for interface dimensions.