Leak-Free Load-Control Valves SAE 32
Qmax = 1000l/min [265 gpm],pmax = 420bar [6000 psi]
Seat-valve, two-stage hydraulic, cartridge design
Series CINDY 32-B-C...
S Two-stage load-control valve and bypass check valve
are functionally combined in one coaxial valve assembly
S Leak-free load holding
S Pilot ratio 1:113
S The control assembly is guaranteed to close
→ it closes even with a broken spring
S Various pilot-pressure ranges can be chosen
S All exposed parts with zinc-nickel plating
S Various types of pilot control, matched to your system,
can be supplied
S Low-noise operation thanks to specially shaped control
grooves
1
Description
Whenever large loads are to be precisely moved, placed
and held, when work access platforms must maintain their
position, or when hydraulic presses gates need to withstand
high forces, then CINDY load-control valves from Bucher
Hydraulics are the right solution.
Load-control valves in this series prevent hydraulic actua­
tors from running ahead of the available oil supply.
2
In one valve, they combine the functions of load-holding,
safety and pipe-rupture protection. Leak-free load-control
valves in this series are ideally suited for use in high pres­
sure applications up to 420 bar (6000 psi) with a safety fac­
tor of at least 3.
With a variety of optional components, the range can be ex­
tended and adapted to the requirements of the system.
Symbol
Variant L
Influenced by return-line pressure
(pressure in A is additive to opening pilot pressure).
Not influenced by return-line pressure
(drain line is required).
siehe Ansteuerungsvarianten
see types of pilot control
siehe Ansteuerungsvarianten
see types of pilot control
Variant A
X
A
B
X
L
A
B
Reference: 300-P-9050099-EN-03
Issue: 03.2017
1/9
3
Technical data
General characteristics
Description, value, unit
Designation
Leak-free load-control valve
Design
Seat-valve, two-stage hydraulic, cartridge design
Size
SAE 32
Mounting method
Factory standards
(1x Cylinder screw with internal hexagon DIN 912,
M10 x 22 – strength category 12.9)
Actuator / drive ports
Pilot / drain ports
A, B,
X, L
∅ 38 mm
∅ 4 mm
[∅ 1.49 inch]
[∅ 0.15 inch]
(factory standards)
(factory standards)
Mounting attitude
unrestricted
Ambient temperature range
-20°C … +80°C
(others on application)
Surface Protection
Outside parts: Zinc-nickel coating
Mounting screws zinc-flake coated
(e.g. with Geomet® finish)
Hydraulic characteristics
Description, value, unit
Maximum pressure at the flow- or return port A
420 bar
[6000 psi]
Maximum pressure at the actuator- / load port B
420 bar
[6000 psi]
Maximum pressure at the pilot port X
420 bar
[6000 psi]
Maximum flow rate
1000 l/min
[265 gpm]
(higher flow rates on application)
Flow direction
A → B, free flow through check valve
B → A, controlled flow
Operator type
hydraulic proportional
Opening pilot ratio
1:113
Hydraulic fluid
HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Temperature rating of seals
NBR
FKM
MIL
- 20 °C … + 80 °C
- 20 °C … + 200 °C
- 50 °C … + 80 °C
[- 4 °F … + 176 °F]
[- 4°F … + 176 °F]
[- 4°F … + 392 °F]
[- 58°F … + 176 °F]
Viscosity range
10…650mm2/s (cSt), recommended 15...250mm2/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
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Series CINDY
4
Construction and function
The function of the control assembly is subdivided into the following positions:
4.1 Neutral position
The load pressure and the compression spring act on the control spool in the closing direction. The valve is thus closed with
no leakage.
4.2 Lifting (flow direction from A → B)
The pump pressure at port A opens the valve against the “light” compression spring and the load. The pilot spool and control
spool move together in the opening direction. Oil flows from A → B and the valve functions as a check valve.
4.3 Lowering (flow direction from B → A)
The pilot pressure at port X acts on the pilot piston and against the control springs. The pilot spool opens. As a result, the load
pressure B is discharged to port A via the metering grooves in the pilot spool. The progressive characteristic of the pre-opening
phase ensures that lowering begins smoothly and without jerks.
If the pilot pressure at port X is increased, the pilot spool opens further. The change in the pressure conditions at the control
spool means that it follows the pilot spool in the opening direction. The oil flows from B → A.
Neutral position
M
300-P-9050099-EN-03/03.2017
Series CINDY
Lifting (A " B)
M
Lowering (B " A)
M
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4.4 Types of pilot control
Cover types /
application
Type “G“
Type “D“
Type “K“
Type “H“
✓✓
✓
(✓)
✓✓
(✓)
(✓)
Motors / Winches
(✓)
✓✓
Motors for slewing
drives
✓✓
Cylinder application
(external pilot signal)
Cylinder application
(pilot signal from opposite line)
Legend: ✓✓ = recommended
4.4.1
✓ = can be done
(✓) = conditionally possible
= not possible
Standard cover, type “G“
Pilot control type “G“ is recommended for external control,
or with low-oscillation applications. With this control cover,
damping orifices cannot be retrofitted.
Stroke-dependent damping is not possible with this cover.
X
ZD
BY
L (A)
4.4.2
Stroke-dependent damping cover, type “D“
The type “D“ cover is recommended for conditioning pilot
signals that come from the opposite actuator line and for ap­
plications that are susceptible to oscillations. Thanks to the
pilot piston's stroke-dependent damping system, oscilla­
tion-prone applications can be started in a very stable man­
ner. The starting pressure peak is reduced because in the
starting zone the valve responds quickly to the pilot signal.
X
ZD
DD1
DD2
BY
L (A)
4.4.3
Stroke-dependent damping cover with metering grooves, type “K“
X
The stroke-dependent damping cover with metering
grooves, type “K“, is recommended for applications that are
susceptible to oscillations, such as hydraulic motors
(e.g. winches).
ZD
BY
(“DD1“) L
4.4.4
L (A)
Hydromechanical stroke-limiting cover, type “H“
With the type “H“ pilot control, the stroke is limited in order
to achieve a particular flow rate or speed. This reduces the
valve resolution.
General:
The series-connection of the orifices allows the opening time, the closing time, the start of opening, and the full extent of open­
ing to be matched to the requirements of the application.
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300-P-9050099-EN-03/03.2017
Series CINDY
5
Performance graphs
40 (570)
V800
V630
V500
P0025.ai
V400
V1000
P0026.ai
V800
14 (203)
V630
Lowering (B → A, valve fully opened)
V500
Δp = f (Q) Pressure drop - Flow rate characteristic
Lifting (A → B)
V400
Δp = f (Q) Pressure drop - Flow rate characteristic
V1000
measured with oil viscosity 33mm2/s (cSt)
12 (174)
30 (430)
10 (140)
8 ( 115)
20 (285)
6 (90)
4 (60)
10 (140)
2 (30)
0
6
0
100 200 300 400 500 600 700 800 900 1000 Q [l/min]
(26) (53) (79) (105) (132) (159) (185) (211) (238) (265)
(gpm)
0
0
100 200 300 400 500 600 700 800 900 1000 Q [l/min]
(26) (53) (79) (105) (132) (159) (185) (211) (238) (265)
(gpm)
Available modules
IMPORTANT!:
Other control versions available on application:
- Hydraulic pressure reduction, type “R“
- Electro-proportional pressure reduction, type “E“
300-P-9050099-EN-03/03.2017
Series CINDY
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6.1 Body and control versions
Beispiel für die Masseinheit:
Example for the dimension unit:
0.79
= 0.79 mm millimeter
[.010] = 0.010 ˝
inch
Deckel Typ / cover type “G“
31
[1.22]
23
[.354]
50
[1.96]
Angriffsflächen zum Montieren und Demontieren
Areas for assembling and disassembling
11
[0.43]
A-A
X
L
A
Angriffsfläche zum Demontiere
Area for disassemblin
B
∅70
Deckel
Cover
t = 62
[t = 2.44]
Deckel Typ / cover type “D“ + “K“
6 [.236]
M10
(*) = werkseitige Einstellung
(*) = factory setting
50
[1.96]
189.5
[7.46]
Serien Nr.
Serial no.
A-A
t = 62
[t = 2.63]
Deckel Typ / cover type “H“
50
[1.96]
52.5
[2.06]
44
[1.73]
40
[1.57]
87.5
[3.44]
(*) = werkseitige Einstellung
(*) = factory setting
t = 67
[t = 2.63]
ATTENTION!:
The force for assembling or disassembling the
load control valve, should only be applied on the
designated faces or threads.
Assemble or disassemble by hits on the load con­
trol valve is not allowed – Danger of loosing pres­
sure loaded parts!
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300-P-9050099-EN-03/03.2017
Series CINDY
6.2 Cavity type
SCHNITT A-A
CUT A-A
149.5 ± 0.1
147 ± 0.1
107 ± 0.1
104.5 ± 0.1
0
∅38 ** -0.2
bis min. ∅108
until at least ∅108
72 ± 0.2
0.05 A
(2.5)
16.5
∅4
Ra 1.6
2.5
Ra 1.6
(2.5)
44 ± 0.1
Ra 1.6
A
A
X
-0.1
-0.15
-0.1
-0.15
(2.5)
B
B
B
-0.1
-0.15
∅80 **
Cavity
variant no. 1
-0.1
-0.15
-0.1
-0.15
∅80 **
Aufnahmebohrung
Variante 1
∅70 +0.035
0
A
Ra 1.6
0.015
Detail Y
L
∅4
A
(2.5)
35.5
49.5 ± 0.1
SCHNITT B-B
CUT B-B
52 ± 0.1
92 ± 0.1
94.5 ± 0.1
127 ± 0.2
∅38 **
18
SCHNITT A-A
CUT A-A
min. 194
(X)
22
190 ± 0.3
M10
∅4
A
0
Die Bohrung ∅70 -2 muss mit einer Bohrung
∅4 (radial oder axial) drucklos mit
Atmosphäre verbunden werden!
Aufnahmebohrung
Variante 2
(übrige Masse – wie Variante 1)
The hole ∅70 -2 must be connected to
atmosphere by a hole of ∅4, either in axial
or radial direction!
0
∅70 -2
0
∅4
Cavity
variant no. 2
(all other dimensions
– see variant no. 1)
(L)
)
min. 190 ( ∅70 +0.035
0
B
Detail Y
-0.1
-0.15
Ra 1.6
-0.1
-0.1
-0.15 -0.15
-0.1
-0.15
2.5
2.5
ACHTUNG:
Mit ** markierte Masse sind empfohlene Masse.
Abweichungen gegenüber der Empfehlung haben
gegebenenfalls Einfluss auf die hydraulischen
Kennwerte.
Die Kennlinien im Katalog basieren auf Ermittlungen
mit der dargestellten Aufnahmebohrung. Auslegung
des Blockes bezüglich Materialauswahl und
allgemeine Festigkeit liegen ausserhalb des
Verantwortungsbereiches von Bucher Hydraulics.
(∅71.82)
(∅71.82)
min. 205
12±0.1
Ra 1.6
2.5
2.5
ATTENTION:
All dimensions marked with ** are recommended
dimensions.
Deviations from the recommendation may have an
influence on the hydraulic characteristic values.
The characteristic curves in the official catalog are
based on measurements with the represented cavity.
Design of the block, regarding choice of materials and
its general strength are beyond the scope of
responsibility of Bucher Hydraulics.
Ra 1.6
Einstich für X-Anschluss
(Variante interne Verbindung)
Puncture for X-Port
(Variant internal connection)
21±0.1
31±0.1
Einstich für L-Anschluss
(Variante interne Verbindung)
Puncture for L-Port
(Variant internal connection)
40±0.1
300-P-9050099-EN-03/03.2017
Series CINDY
−0.1
−0.3
N8
N7
+0.3
+0.1
Ra [μm]
Rz [μm]
Rmax [μm]
N7
N8
1.6
12
18
3.2
20
25
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7
Safety instructions
7.1 Assembly / disassembly
IMPORTANT!:
The valve may only be used for its intended pur­
pose within its nominal rating. If you plan to use it
outside the nominal rating, you must contact the
valve manufacturer.
The ultimate responsibility for safety in the instal­
lation and use rests with the end­machine manu­
facturer of the mobile application.
IMPORTANT!:
The port threads conform to DIN 3852 T1.
Use screws to DIN 912, grade 12.9, to mount the
valve.
Tightening torques as per the manufacturer's in­
structions.
IMPORTANT!:
Protect seals and flange faces from damage.
The mating flange face must be of the quality
specified in the data sheet!
Pay attention to the port designations.
IMPORTANT!:
Seal kit with the external seals is available on ap­
plication.
8
Application examples
8.1 Cylinder application
8.2 Motor application
CINDY 32-B-C with the control version type “G“
CINDY 32-B-C with the control version type “K“
extern
external
m
MB
(DD1) L
MB
BY
ZD
MA
MA
X
A
B
ZD
X
extern
external
A
P
M
8/9
A
B
B
T
A
B
P
T
M
300-P-9050099-EN-03/03.2017
Series CINDY
9
Ordering code
CINDY –
32
–
B
–
C N O
–
V400
–
A
–
G
–
__
CINDY = series
32
= nominal size 32
B
C
= model / version
= cartridge design
N
V
T
O
D
=
=
=
=
=
NBR (Nitrile) seals (standard)
FKM (Viton) seals
MIL (low temperature) seals
without mounting screws (standard)
incl. Geomet (zinc flake) mtg. screws M10x22-12.9 DIN 912
V400
V500
V630
V800
V1000
=
=
=
=
=
Progressive-spool, lowering flow rate
Progressive-spool, lowering flow rate
Progressive-spool, lowering flow rate
Progressive-spool, lowering flow rate
Progressive-spool, lowering flow rate
A
L
= influenced by return-line pressure in A
= not influenced by return-line pressure
G
D
K
H
...
=
=
=
=
=
400 l/min [105 gpm] *)
500 l/min [132 gpm] *)
630 l/min [167 gpm] *)
800 l/min [212 gpm] *)
1000 l/min [265 gpm] *)
standard cover
stroke-dependent damping cover
stroke-dependent damping cover with metering grooves
hydromechanical stroke-limiting cover
orifice combination (is factory-defined)
*) at 33 bar [479 psi]Δp from B → A.
other lowering flow rates on application.
IMPORTANT!:
Secondary pressure rerlief valve (SV) on applica­
tion
IMPORTANT!:
Other control / cover versions on application.
[email protected]
IMPORTANT!:
Additional documentation and 3D models (.stp or
.igs format) can be downloaded from
www.bucherhydraulics.com
(LOGintern area; registration is necessary)
www.bucherhydraulics.com
E 2017 by Bucher Hydraulics AG, CH-6345 Neuheim
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: 430.325.355.330325
300-P-9050099-EN-03/03.2017
Series CINDY
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