Pressure-Relief Cartridge Valve, Size 10
Q
max
= 140l/min,p
max
= 450bar
for cross-line relief function,direct acting, seat valve design
Series DDPDB-3D …
1/4
Reference: 400-P-271101-EN-01
Issue: 09.2021
S Seat valve design gives virtually zero-leakage closure
from port A to B and B to A
S Pressures to 450 bar on all ports (see model code key)
S Ideal for service line relief, sequence or pre-load
functions (fast and stable response)
S Available in line mounting body DD-12 (G 1/2”)
S Also available in ISO / CETOP 05 stack mounting body
1. Description
Series DDPDB-3D-10 ... cartridges are direct acting pres
sure relief valves for combined cross-line relief duties i.e.
pressure is relieved either from A-to-B or from B-to-A as
necessary (see symbol). These dual function cartridges
can replace 2 conventional cartridge valves, with corre
sponding savings in space and cost. Their seat valve de
sign ensures virtually zero leakage and they are designed
to fit BUCHER cavity type DD. The spring chamber is exter
nally drained via port Y which must be run directly to tank
without any significant back pressure. The cartridge is de
signed to be fitted with a normal 27 A/F OE spanner (use the
correct tightening torque). For customers who manufacture
their own manifold blocks, we offer form tool sets for sale or
hire. The line- and manifold mounting body DD-12 is avail
able for line mounting applications.
2. Symbols
BA
Y
DDPDB-3D-10...
3. Characteristics
Type pressure relief cartridge valve
for cross-line relief duty (A B and B A)
Design direct acting seat valve, i.e. poppet type
Mounting method screw-in cartridge
Size 10 mm nominal size, BUCHER cavity type DD
Mass kg 0,35
Mounting attitude unrestricted
Flow direction A B and B A, see symbol
Operating pressure p
max
bar ... 450 in A, B and Y,
for proper functioning, Y must be run directly to tank
Adjustment ranges,
see performance curves
bar pressure range P = 350 ... 450
pressure range O = 300 ... 400
pressure range N = 180 ... 350
pressure range M = 80 ... 240
pressure range L = 10 ... 100
Flow rate Q
max
l/min 140, see performance curves
400-P-271101-EN-01/09.2021
Series DDPDB-3D …
2/4
Fluids
Hydraulic oils HL and HLP to DIN 51 524
other fluids - contact BUCHER
Fluid temperature range _C -25 ... +80
Viscosity range cSt 10 ... 650 mm
2
/s, recommended 15 … 250 mm
2
/s
Minimum fluid cleanliness 20/18/15 to ISO 4406 : 1999
4. Application example
BA
Y
Cross-line relief duty
with hydraulic motors
5. Performance characteristics
Oil viscosity 33 cSt
Q (l/min)
DDPDB-3D-10-SP ...
Q (l/min)
Q (l/min)
Q (l/min)
Q (l/min)
pA bzw. pB (bar)
14020 60 100
200
100
300
400
1208040
500
14020 60 100
200
100
300
400
1208040
500
14020 60 100
200
100
300
400
1208040
pA bzw. pB (bar)
pA bzw. pB (bar)
DDPDB-3D-10-SO ...
DDPDB-3D-10-SN ...
DDPDB-3D-10-SM ... DDPDB-3D-10-SL ...
14020 60 100
200
100
300
1208040
240
14020 60 100
25
100
1208040
125
50
75
pA bzw. pB (bar)
pA bzw. pB (bar)
Performance limit pA
Performance limit pB
Performance limit pA
Performance limit pB
Performance limit pA
Performance limit pB
Performance limit pA
Performance limit pB
Performance limit pA
Performance limit pB
400-P-271101-EN-01/09.2021
Series DDPDB-3D …
3/4
6. Dimensions
46,5
max. 91
max. 137,5
M10 x 1
ø 30
M24 x 1,5
B
A
Y
22
11
ø 19
ø 20,5
ø 21,8
Line- and manifold-
mounting body
type DD-12
Cavity type DD
27 A/F hex.
Tightening torque
M
A
= steel 100 Nm +/- 10%
M
A
= alu 50 Nm +/- 10%
for fitting the cartridge
5 A/F hex. skt. for
pressure adjustment
16 A/F hex.
locknut
7. Schematic section
Seal kit no. DS-255, comprising:
Itm. Qty. Description Dimension
1 1 Sealing ring 22,1 / 16,1 x 2,5
2 1 O-ring no. 020 21,95 x 1,78 N90
3 1 O-ring 21,00 x 2,00 N75
A
B
Y
2
3
1
8. Installation and servicing
All installation and servicing must be carried out with care,
and by qualified personnel only. When changing seals, the
new seals must be thoroughly oiled or greased before they
are fitted. Use the correct tightening torques at all times.
9. Model code key
DDP
A ... Q
Z ... R
3
D
10
S
P
O
N
M
L
Nitrile seals (standard)
V
1 ... 9
=
=
=
=
=
=
=
=
=
=
=
=
=
=
direct acting pressure relief cartridge valve
standard model per current data sheet
special features by arrangement
control type 3 (external drain via Y)
for BUCHER cavity type DD
nominal size 10 mm
with hex. skt. screw adjuster
pressure range 350 ... 450 bar
pressure range 300 ... 400 bar
pressure range 180 ... 350 bar
pressure range 80 ... 240 bar
pressure range 10 ... 100 bar
Viton seals
design number (omit when ordering)
DDP
Ex.
D3-BD10-S__
- 2
D = cross-line relief function
Special seals by arrangement (contact BUCHER)
(Blank) =
10. Related data sheets
Old no. New no.
i-32.00 400-P-040011-EN The Form Tool hire programme
i-45.20 400-P-060121-EN BUCHER cavity type DD
G-24.21 400-P-740111-EN Line- and manifold mounting body type DD-12 (G 1/2”)
400-P-271101-EN-01/09.2021
Series DDPDB-3D …
4/4
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
E 2020 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 450310.305.320.355