Pressure-Relief or Sequence Cartridge Valve, Size 10
Q
max
= 140l/min,p
max
= 450bar
Direct acting, positive seat design
Series DDPB-3D…
1/4
Reference: 400-P-270201-EN-01
Issue: 09.2021
S Positive seat design gives near zero-leakage closure
of ports A and B
S Good override characteristics due to dynamic poppet
stroke assistance
S External drain - valve setting unaffected by pressure
variations in B
S Pressures to 450 bar, all ports (A, B and Y, see model
code key)
S Ideal for sequence, back-pressure and anti-shock
service (fast and stable response)
S Available as cartridge or in DD-12 line mounting body
S Also available in ISO / CETOP 05 stack-mounting body
(315 bar max.)
1. Description
Series DDPB-3D-10 ... cartridges are direct acting pres
sure relief valves. Their positive seat design ensures vir
tually zero leakage, and they are designed to fit BUCHER
cavity type DD. The spring chamber is externally drained
via port Y, therefore back pressure applied to port B does
not influence the valve relief setting (See also internally
drained model DDPB-1C-10 ...). Thoroughly oil or grease
external seals before fitting the cartridge in a DD cavity. The
cartridge can be tightened with a 27 A/F OE spanner (note
the recommended tightening torque). Form tools are avail
able for sale or hire, should customers wish to machine their
own cavities (see data sheet i-32). For line- and manifold-
mounting body, type DD-12 see related data sheet.
2. Symbols
BA
Y
DDPB-3D-10...
3. Characteristics
Type pressure relief cartridge valve
Design direct acting, positive seat (poppet)
Mounting method screw-in cartridge
Size 10 mm nominal size, BUCHER cavity DD
Mass kg 0,35
Mounting attitude unrestricted
Flow direction A = pressure inlet, B = pressure outlet
Operating pressure bar ... 450 max. in A, B and Y
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 limits
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
400-P-270201-EN-01/09.2021
Series DDPB-3D…
2/4
4. Performance characteristics
Oil viscosity 33 cSt
Q (l/min)
Q (l/min) Q (l/min)
pA (bar)
14020 60 100 14020 60 100 14020 60 100
500
400
300
200
100
500
400
300
200
100
200
100
300
400
DDPB-3D-10-SP DDPB-3D-10-SO DDPB-3D-10-SN
14020 60 10014020 60 100
100 50
100
150
200
300
100
30
20
10
200 30050
DDPB-3D-10-SM DDPB-3D-10-SL
pA (bar)
pA (bar)
pA (bar)
pA (bar)
QL
(cm3 / min)
Q (l/min)
Q (l/min)
pB (bar)
Leakage Q
L
from B Y
Performance limits
Performance limits
Performance limits
Performance limits
Performance limits
5. Dimensions
46,5 max. 91
max. 137,5
ø 30
M24 x 1,5
ø 21,8
B
A
Y
22
11
ø 19
ø 20,5
M10 x 1
Line- and manifold-
mounting body
type DD-12
Cavity type DD
27 A/F hex.
Tightening torque
Ma = steel 100 Nm +/- 10%
Ma = alu 50 Nm +/- 10%
for fitting the cartridge
5 A/F int. hex. for
pressure adjustment
16 A/F
Locknut
400-P-270201-EN-01/09.2021
Series DDPB-3D…
4/4
7. 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 torque when fitting the
threaded bush.
8. Model code key
DDP
A ... Q
Z ... R
3
D
10
S
P
O
N
M
L
(Blank) = Nitrile seals (Standard)
V
Special seals by arrangement (contact BUCHER)
1 ... 9
Line- and manifold-mounting body type DD-12 (G 1/2”)
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=1 ... 9
direct acting pressure relief cartridge
Standard -model per relevant data sheet
Special features by arrangement
Control type 3 (external drain via port Y)
for BUCHER cavity type DD
Nominal size 10 mm
with screw adjustment
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 no. (omit when ordering)
Design no. (omit when ordering)
DDP B - 3 D - 10 - S N _ - 1 + DD - 12
- 2
Ex.
9. Related data sheets
Old no. New no.
i-32.00 400-P-040011-EN The Form Tools hire programme
i-45.20 400-P-060121-EN BUCHER cavity type DD
D-3.31
400-P-270101-EN Pressure relief cartridge valve, series DDPB-1C ...
G-24.21 400-P-740111-EN Line- and manifold mounting body type DDY-12 (G 1/2”)
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
Classification: 450310.305.320.355
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.
