Bucher Hydraulics NS 32 User manual

Leak-Free Load-Control Valves NS 32
Qmax = 1000l/min [265 gpm],pmax = 420bar [6000 psi]
Seat-valve, two-stage hydraulic, cartridge design
Series CINDY 32-B-C...
1/9
Reference: 300-P-9050099-EN-02
Issue: 10.2016
STwo-stage load-control valve and bypass check valve
are functionally combined in one coaxial valve assembly
SLeak-free load holding
SPilot ratio 1:113
SThe control assembly is guaranteed to close
→it closes even with a broken spring
SVarious pilot-pressure ranges can be chosen
SAll exposed parts with zinc-nickel plating
SVarious types of pilot control, matched to your system,
can be supplied
SLow-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.
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.
2 Symbol
Variant A
Influenced by return-line pressure
(pressure in A is additive to opening pilot pressure).
ABX
siehe Ansteuerungsvarianten see types of pilot control
Variant L
Not influenced by return-line pressure
(drain line is required).
ABX L
siehe Ansteuerungsvarianten see types of pilot control

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3 Technical data
General characteristics Description, value, unit
Designation Leak-free load-control valve
Design Seat-valve, two-stage hydraulic, cartridge design
Size Nominal size 32
Mounting method Factory standards
(1x Cylinder screw with internal hexagon DIN 912,
M10 x 22 – strength category 12.9)
Actuator / drive ports A, B,
Pilot / drain ports X, L
∅ 38 mm [∅ 1.49 inch] (factory standards)
∅ 4 mm [∅ 0.15 inch] (factory standards)
Mounting attitude unrestricted
Ambient temperature range -20°C … +80°C [- 4 °F … + 176 °F]
(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 [- 4°F … + 176 °F]
- 20 °C … + 200 °C [- 4°F … + 392 °F]
- 50 °C … + 80 °C [- 58°F … + 176 °F]
Viscosity range 10…650mm2/s (cSt), recommended 15...250mm2/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15

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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 Lifting (A "B) Lowering (B "A)
M
AB
X
M
ABX
M
AB
X

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4.4 Types of pilot control
Cover types /
application
Type “G“ Type “D“ Type “K“ Type “H“
Cylinder application
(external pilot signal)
✓✓   ✓
Cylinder application
(pilot signal from opposite line)
(✓) ✓✓ (✓) (✓)
Motors / Winches  (✓) ✓✓ 
Motors for slewing
drives
 ✓✓  
Legend: ✓✓ = recommended ✓ = can be done (✓) = conditionally possible  = not possible
4.4.1 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.
ZD
BY
L (A)
X
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.
ZD
DD1
DD2 BY
L (A)
X
4.4.3 Stroke-dependent damping cover with metering grooves, type “K“
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
L (A)(“DD1“) L
X
4.4.4 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. ZD
BY
X
L (A)
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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5 Performance graphs
measured with oil viscosity 33mm2/s (cSt)
Δp = f (Q) Pressure drop - Flow rate characteristic
Lifting (A →B)
0
2 (30)
4 (60)
6 (90)
8 (115)
Q [l/min]300100 6004002000
Δp [bar (psi)]
500 700 800 900 1000
10 (140)
12 (174)
14 (203)
(79)(26) (159)(105)(53) (132) (185) (211) (238)(265) (gpm)
P0026.ai
V1000
V800 V630 V500 V400
Δp = f (Q) Pressure drop - Flow rate characteristic
Lowering (B →A, valve fully opened)
0
10 (140)
20 (285)
30 (430)
40 (570)
Q [l/min]300100 6004002000 500 700 800 900 1000
Δp [bar (psi)]
(79)(26) (159)(105)(53) (132) (185) (211) (238)(265) (gpm)
P0025.ai
V1000
V800 V630 V500
V400
6 Available modules
IMPORTANT!:
Other control versions available on application:
- Hydraulic pressure reduction, type “R“
- Electro-proportional pressure reduction, type “E“

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6.1 Body and control versions
Deckel Typ / cover type “G“
Deckel Typ / cover type “D“ + “K“
(*) = werkseitige Einstellung
Deckel Typ / cover type “H“
(*) = werkseitige Einstellung
31
[1.22]
23
[.354]
50
[1.96]
t = 62
[t = 2.44]
t = 67
[t = 2.63]
XA B
6 [.236]
189.5
[7.46]
∅70
11
[0.43]
Deckel
M10
L
A-A
A-A
52.5
[2.06]
44
[1.73]
40
[1.57]
87.5
[3.44]
(*) = factory setting
Cover
(*) = factory setting
50
[1.96]
t = 62
[t = 2.63]
50
[1.96]
Angriffsfläche zum Demontier
e
Area for disassembli
n
Angriffsflächen zum Montieren und Demontieren
Areas for assembling and disassembling
Serien Nr.
Serial no.
Beispiel für die Masseinheit:
Example for the dimension unit:
0.79 = 0.79 mm millimeter
[.010] = 0.010 ˝ inch
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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6.2 Cavity type
∅4
XA
B
L
149.5 ±0.1
147 ±0.1
107 ±0.1
104.5 ±0.1
SCHNITT A-A
72 ±0.2
16.5
∅4
2.5
(2.5) (2.5)
35.5
49.5 ±0.1
52 ±0.1
92 ±0.1
94.5 ±0.1
127 ±0.2
190 ±0.3
∅4
(2.5)
(2.5)
∅38 0
-0.2
∅38 0
-0.2
0.05 A
bis min. ∅108
A
0.015
Ra 1.6
∅70 +0.035
0
-0.1
-0.15
-0.1
-0.15
-0.1
-0.15 -0.1
-0.15
-0.1
-0.15
Ra 1.6 Ra 1.6 Ra 1.6
∅80 ∅80
to min. ∅108
Aufnahmebohrung
Variante 1
Detail Y
B
B
A
A
44 ±0.1
SCHNITT A-A
min. 194
(X) A
B
(L)
M10
∅4
∅70-2
0
min. 205
min. 190 ∅70+0.035
0
()
Aufnahmebohrung
Variante 2
(übrige Masse – wie Variante 1)
Die Bohrung ∅70 0/-2 muss mit einer
Bohrung ∅4 (radial oder axial) drucklos mit
Athmosphäre verbunden werden!
SCHNITT B-B
18
22
Detail Y -0.1
-0.15
-0.1
-0.15
-0.1
-0.15
-0.1
-0.15
Ra 1.6
Ra 1.6
Ra 1.6 2.5 2.5 2.5 2.5
12±0.1
(∅71.82) (∅71.82)
21±0.1
31±0.1
40±0.1
Einstich für X-Anschluss
(Variante interne Verbindung)
Einstich für L-Anschluss
(Variante interne Verbindung)
CUT B-B
CUT A-A
CUT A-A
Cavity
variant no. 2
(all other dimensions
– see variant no. 1)
Cavity
variant no. 1
The hole ∅70 0/-2 must be connected to
atmosphere by a hole of ∅4, either in axial
or radial direction!
Puncture for X-Port
(Variant internal connection)
Puncture for L-Port
(Variant internal connection)

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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 endmachine manu
facturer of the mobile application.
IMPORTANT!:
Seal kit with the external seals is available on ap
plication.
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.
8 Application examples
8.1 Cylinder application
CINDY 32-B-C with the control version type “G“
A
M
B
P T
XBA
MB
MA
ZD
extern
external
8.2 Motor application
CINDY 32-B-C with the control version type “K“
extern
A
M
ZD
BY
extern
XBA
B
P T
(DD1) L
MB
MA
m
external

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9 Ordering code
CINDY = series
32 = nominal size 32
B = model / version
C = cartridge design
N = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
T = MIL (low temperature) seals
O = without mounting screws (standard)
D = incl. Geomet (zinc flake) mtg. screws M10x22-12.9 DIN 912
V400 = Progressive-spool, lowering flow rate 400 l/min [105 gpm] *)
V500 = Progressive-spool, lowering flow rate 500 l/min [132 gpm] *)
V630 = Progressive-spool, lowering flow rate 630 l/min [167 gpm] *)
V800 = Progressive-spool, lowering flow rate 800 l/min [212 gpm] *)
V1000 = Progressive-spool, lowering flow rate 1000 l/min [265 gpm] *)
A = influenced by return-line pressure in A
L = not influenced by return-line pressure
G = standard cover
D = stroke-dependent damping cover
K = stroke-dependent damping cover with metering grooves
H = hydromechanical stroke-limiting cover
... = orifice combination (is factory-defined)
A __
G––
V400 ––ONC–
B
32 –
CINDY –
*) 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.
IMPORTANT!:
Additional documentation and 3D models (.stp or
.igs format) can be downloaded from
www.bucherhydraulics.com
(LOGintern area; registration is necessary)
E2016 by Bucher Hydraulics AG, CH-6345 Neuheim
www.bucherhydraulics.com[email protected]
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