VO40 Open-Center
Directional Control
Valve
Catalog HY17-8505/UK
April 2007
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Contents
VO40
Introduction.............................................................................................................................................................1
Schematic Circuit Types ...................................................................................................................................6
How to Order..................................................................................................................................................10
Assembly Configuration Form............................................................................................................................22
Parker Hannifin Corporation
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
VO40
Conversion factors
1 kg
1 N
= 2.2046 lb
= 0.22481 lbf
1 bar
1 l
1 l
1 cm3
1 m
1 mm
= 14.504 psi
= 0.21997 UK gallon
= 0.26417 US gallon
= 0.061024 in3
= 3.2808 feet
= 0.03937 in
9/5 °C + 32 = °F
Parker Hannifin Corporation
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Introduction
VO40
Breadth of Line
Parker Hannifin is a Fortune 500
company with sales of $9 billion
and over 400,000 customers in 43
countries. Parker is the world’s
leading supplier of motion control
components and system solutions
serving the mobile, industrial
and aerospace markets.
Parker is your single source
for any hydraulic valve require-
ment. We provide a wide selection
of open-center and load-sense
directional control valves for any
construction, off-highway, or on-
highway application. Many of our
open-center valves can be adapted
and used as closed-center, constant-
pressure, and constant-pressure
unloaded valves. Each of these
technologies offers unique features
for improved machine performance
over traditional, open-center control
valves.
uptime. The IQAN valve drivers
offer superior control of propor-
tional hydraulic functions resulting
in increased machine productivity.
Non-programmers find IQAN’s
programming interface easy to use,
reducing development time. Fur-
thermore, excellent diagnostic tools
and remote modem connection help
cut field service time.
When remote control is required,
Parker provides a broad line of
pilot controllers that are compact
and pressure-matched with our
control valves to provide consistent
and optimized machine control.
There are a variety of electric-
switch handle options available
for additional function control by
the operator.
Parker’s premier IQAN electron-
ics packages range from simple
stand-alone controllers to large,
multiple CAN bus systems with
color displays. For example, IQAN
interfaces with new electronic
diesel engines over the SAE J1939
CAN bus.
Total Machine
Motion Control
You can turn to us for all your
mobile motion control solutions.
We offer stand-alone valves, as well
as custom-designed manifolds with
integrated directional control valves.
Package components are
designed and tested for
mobile applications to
help increase machine
No matter what type of system you
choose, Parker solutions provide
top-notch performance and reli-
ability. Our systems are optimized
to reduce complexity, size, cost, and
fluid leakage. Therefore, working
with Parker can significantly cut
your machine-build time.
Parker Hannifin Corporation
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Introduction
VO40
You also benefit from Parker
Mobile Technology Centers
(MTCs) that are staffed by specially
trained distributors who provide
only the highest levels of customer
service. These one-stop shops offer
complete hydraulic systems design
for mobile applications, as well as
technology services such as diag-
nostics, troubleshooting, computer
design, testing, and integration of
electronic controls.
Finally, our thousands of depend-
able distributors are strategically
located in your markets. They carry
inventory to meet specific, local
market needs, and they ensure that
products arrive when and where
they are needed. You can count on
Parker distributors to minimize
downtime.
State-of-the-Art
Manufacturing
To locate your nearest distributor
for the latest information on the
VO40 Directional Control Valve, or
our entire mobile valve line-up, visit
Parker is committed to using lean
manufacturing to eliminate waste
while streamlining processes.
Lean technology helps us meet
customer request dates quickly
and cost-effectively. We also rely
on state-of-the-art equipment and
technology, such as computer-
aided machining, to ensure
product quality.
Customer Service
with A Global Reach
Parker’s worldwide network of field
sales engineers and Mobile Systems
Engineers (MSEs) are the best in
the business. A field sales engineer
works closely with you, acting as a
single point of contact to evaluate
applications and design solutions.
MSEs support field sales efforts by
managing difficult design problems
and complex circuit design.
We regularly invest in our ISO 9001
certified manufacturing facilities
because we are committed to
meeting all international standards
for safety and quality. The hydraulic
valves we manufacture comply with
relevant ISO, CSA, CE, and AMEX
standards.
In addition, Parker hydraulic valves
and valve manifolds are fully tested
and certified before being released
to the customer. You can expect
Parker hydraulic valves to work the
first time, every time.
Parker Hannifin Corporation
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Technical Information
VO40
General Description
The VO40 is an open-center directional control valve
with the flexibility of sectional construction. Consis-
tent with this technology, it is simple in its application,
reliable, easy to troubleshoot, and cost effective. The
global design reflects the performance and quality ex-
pected by today’s machine designers. Spools have me-
tering notches in the three critical areas – open- center,
parallel path and tank, which optimizes simultaneous
metering. Contemporary honing technology is used to
deliver low work port to tank leakage. Additionally, each
work section has a transition check to ensure that a
load does not “dip” during simultaneous operation. All
of these features, plus those listed below, were intend-
ed to take machine controllability to the next level.
Operation
The VO40 incorporates traditional open-center technol-
ogy. It is usually interfaced with a constant flow pump,
whose flow is routed directly to tank when the spools
are in neutral. When one or more spools are selected,
flow is directed to the actuators. The throttling of that
flow depends upon the spool position and the design of
the metering notches. Spool notches can be designed
to accommodate resistive loads (meter-in) and nega-
tive loads (meter-out). To accommodate multiple pump
circuits, split flow and combined flow mid inlets are
available.
Benefits
Enhanced metering – especially during simultaneous
•
operation, this is accomplished by having notches in the
three critical areas of the spool: open center, parallel path
and tank.
Improved simultaneous metering – having a transition
check in each work section ensures that a load does not
“dip” downward when metering two or more work-sections.
•
Repeatability – consistent metering from valve to valve
•
is achieved by flycutting all of the critical cast lands. This
means that the notch position relative to the spool stroke
is controlled and predictable. The result is consistent
machine control.
Reduced operator fatigue – the open-center core is
•
a split wing or “Y” core design, which provides for a
consistent lever force when selecting the spool from
neutral to both power positions.
Reduced function drift – low internal leakage
•
accomplished thru the use of contemporary honing
technology. Also, for those functions requiring near zero
drift, pilot-operated checks are available.
Small footprint – port accessories are installed vertical
to the spool, allowing the handle to be positioned closer to
the valve body.
•
Ease of service – the bottom two stud assemblies are
•
slotted, enabling a work section to be replaced without
completely disassembling the valve assembly. This is
accomplished by loosening the top tie bolt and then lifting
the section out of the assembly. Downtime is minimized.
Easy conversion from a left-handed to a right-handed
•
section – the work section housing and spool are
symmetrical, which enables the spool to be inserted in
either end of the housing.
Improved spool seal life – the enclosed handle assembly
protects the spool and spool seal area from contamination
and the potential corrosion.
•
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Technical Information
VO40
Specifications
Connections
Pressures
Inlet Port: 300 bar (4350 PSI)
Tank Port: 50 bar (725 PSI)
Work Ports: 300 bar (4350 PSI)
Standard valves are available in 3/8" BSP (DIN 3852/2), SAE-6
or SAE-8 (J1926/1).
Flow Rates
40 LPM (10.6 GPM)
(maximum
Connection Location
SAE -8
SAE-6
BSP
C\,-19
C\,-19
C\,-19
C\,-19
C\,-19
recommended)
P1, P2
T1, T2
P3
Inlet
Inlet
¾-16 UNF >\zn-18 UNF
¾-16 UNF >\zn-18 UNF
¾-16 UNF >\zn-18 UNF
¾-16 UNF >\zn-18 UNF
¾-16 UNF >\zn-18 UNF
Internal Pilot
Pressure
Required for solenoids –
contact Parker
Spool Leakage
from work port
to tank
Max. 6 mL/min @172 bar (2500 PSI)
Oil temp. 50ºC (122ºF), and viscosity
40 cSt
Outlet
Outlet
Outlet
T3
PB1
Weights
Work
Sections
Weights are approximate due to number of variations
available.
Work Ports
¾-16 UNF >\zn-18 UNF
M\zn-20 UNF M\zn-20 UNF
M\zn-20 UNF M\zn-20 UNF
C\,-19
¼
GAGE
PORT
Inlet
Inlet with relief
Outlet
1.92 kg (4.2 lbs)
1.88 kg (4.1 lbs)
1.93 kg (4.3 lbs)
PC
(Hyd. Conn.)
Work
Sections
¼
Work section with reliefs and
manual actuator
PT
Work
Z\, NPT
Z\, NPT
Z\, NPT
Work section and manual actuator
without reliefs
1.98 kg (4.4 lbs)
2.1 kg (4.6 lbs)
0.8 kg (1.8 lbs)
(Pneu.Conn.) Sections
Work Section, PO Checks with
manual actuator
Joystick assembly
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Technical Information
VO40
Performance Curves
Pressure Drop - Open Center P→T
Pressure Drop - Open Center P→T
Side Inlet to Side Outlet
Top Inlet to Top Outlet
PSI Bar
217.5 15
PSI Bar
217.5 15
P
T
P
T
174.0 12
174.0 12
130.5
9
6
3
130.5
9
6
3
8 Section Valve
3 Section Valve
1 Section Valve
8 Section Valve
3 Section Valve
1 Section Valve
87.0
43.5
87.0
43.5
0
0
10
2.6
30
7.9
10
2.6
30
7.9
LPM
20
5.3
40
10.6
50
13.2
LPM
20
5.3
40
10.6
50
13.2
0
0
GPM
GPM
Flow
Flow
Pressure Drop - P→A
Top Inlet to Cylinder Port
Pressure Drop - A→T
Cylinder Port to Side Outlet
PSI Bar
217.5 15
PSI Bar
217.5 15
A
P
T
8 Section Valve
3 Section Valve
1 Section Valve
174.0 12
174.0 12
A
130.5
9
6
3
130.5
9
6
3
8 Section Valve
3 Section Valve
1 Section Valve
87.0
43.5
87.0
43.5
0
0
10
2.6
30
7.9
10
2.6
30
7.9
LPM
20
5.3
40
10.6
50
13.2
LPM
20
5.3
40
10.6
50
13.2
0
0
GPM
GPM
Flow
Flow
NOTE: ISO VG 46 oil @ 50 °C
Hydraulic Fluids
Environmental Characteristics
Best performance is obtained using mineral-base oil of
high quality and cleanliness in the hydraulic system.
The valve can be mounted in all conceivable directions.
However, the mounting base should be flat and stable so
that the valve is not subjected to strain.
Hydraulic fluids of type HLP (DIN 51524), oil for automatic
gearboxes Type A and engine oil type API CD can be
used.
While the o-rings in the valve are normally of nitrile rub-
ber, there are a number of special fluorocarbon variants.
Please contact Parker for further information.
Viscosity, working range: 15-380 mm2/s (15-380 cST)**
Temperature
Technical information in this catalog is applicable at
an oil viscosity of 30 mm2/s (30 cST) and temperature
of 50 °C (122 °F) using nitrile rubber seals.
Oil temperature, working range:
+20°C to 90 °C (68 to 194 °F)*
* Product operating limits are broadly within the above range, but
satisfactory operation within the specification may not be accom-
plished. Leakage and response will be affected when used at tem-
perature extremes and it is up to the user to determine acceptability
at these levels.
Filtration
Filtration must be arranged so that Target Contamination
Class 20/18/14 according to ISO 4406 is not exceeded.
For the pilot circuit, Target Contamination Class 18/16/13
according to ISO 4406 must not be exceeded.
** Performance efficiency will be reduced if outside the ideal values.
These extreme conditions must be evaluated by the user to establish
suitability of the product’s performance.
Parker Hannifin Corporation
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Technical Information
VO40
Circuit Types – Parallel Circuit
In the open-center parallel circuit, oil flows through the open-center passage when all of the spools are in neutral.
When spools are shifted, oil is diverted into the parallel path and available to each of the selected work-sections.
Simultaneous operation can be achieved, when two or more spools are selected. However, since oil will take the
path of least resistance the operator must meter the flow to each function to get a desired function speed.
T1
[24]
P1
[26]
T4
[34]
B
B
B
A
A
A
G
Circuit Types – Tandem Circuit (Priority)
In the open-center tandem circuit, oil flows through the open-center passage when all of the spools are in neutral.
Tandem work-sections are fed from the open center and the parallel path is blocked. A tandem work-section will
give priority to an upstream work-section.
T1
[24]
T4
[34]
P1
[26]
A
B
A
B
A
B
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Dimensions
VO40
Inch equivalents for millimeter dimensions are shown in (**)
Assembly
US
207.5
(8.16)
B
A
B
32.0
32.0
(1.26)
32.0
(1.26)
9.4 0.4
(0.37 0.01)
92.0 (3.62)
87.0 (3.42)
(1.26)
15.0
(0.59)
70.0
(2.76)
140.0 161.8
(5.51) (6.37)
213.6
(8.41)
25.0
(0.98)
80.9
(3.19)
132.7
(5.23)
15°
27.0
(1.06)
15°
A = 76.0 (3.00) + 32.0 (1.26) x No. WORK STATIONS
B = 32.0 (1.26) + 32.0 (1.26) x No. WORK STATIONS
191.0 (7.51)
Spool Stroke of Work Sections
4-Position Spool
(Float)
3-Position Spool
10°
25.0
(0.98)
25.0
(0.98)
9.5
(0.37)
FLOAT STROKE
5.5
(0.22)
5.5
(0.22)
5.5
(0.22)
5.5
(0.22)
84.0 (3.31)
114.2 (4.50)
STROKE STROKE
STROKE STROKE
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Dimensions
VO40
Mechanical Joystick
Inch equivalents for millimeter dimensions are shown in (**)
295
(11.6)
58
(2.3)
58
(2.3)
94
(3.7)
Float
137
(5.4)
Float
102
(4.0)
43
(1.7)
18
(0.7)
Pneumatic Actuator
37.0
(1.46)
∅30.0
(∅1.18)
92.0
(3.62)
Dual Actuator
6.00
(0.236)
16.25
(0.640)
62.0 (REF)
(2.44)
5.50
(0.216)
Handle Rod
42
30
R9
M8x1
20
R1
140
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Technical Information
VO40
Handle Actuation vs. Spool Direction
A
B
Push Handle
TANK
TANK
•
•
•
Spool Out
Energize port “B”
Port “A” to tank
OPEN
CENTER
OPEN
CENTER
PARALLEL
PATH
PARALLEL
PATH
Pull Handle
Note:
•
•
•
Spool In
Circuit reflects spool
position, not handle
position.
Energize port “A”
Port “B” to tank
Right-Hand Joystick
Left-Hand Joystick
Spool OUT - Section 2
Power to “B” Port
Spool OUT - Section 1
Power to “B” Port
Spool OUT – Section 1
Power to “B” Port
Spool OUT – Section 2
Power to “B” Port
Spool IN – Section 2
Power to “A” Port
Spool IN – Section 1
Power to “A” Port
Spool IN – Section 2
Power to “A” Port
Spool IN – Section 1
Power to “A” Port
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information
VO40
How to Order the VO40 Valve Assembly
A specification sheet is located in the back of this book, and is also available in an electronic Excel format on our
web site. This form should be used to configure a valve assembly. The layout starts from the inlet cover on the left,
work sections and mid-inlets in the middle and the outlet cover on the far right. Each field will require an entry, and
the fields are represented with a position reference [ ] to help guide you to the option codes listed in the catalog
pages 11 to 21.
Inlet Cover Portion of Spec Sheet
Code Position Reference
Example: Inlet Cover (Sect #1)
Customer Information
Customer has 23 l/min pump flow, requires
a pilot operated main relief set 140 bar and
wants all SAE-8 work ports.
Section Number
starting with the Inlet Cover
CUSTOMER
• Reference position [4] calls out the thread
option for the entire valve assembly (SAE
or BSP) (“U8” is the code for all SAE-8
size ports).
CITY:
DATE:
STATE:
FILLED BY:
G = ALL PORTS 3/8" BSP
U = ALL PORTS 9/16" UNF (SAE #6)
U8 = ALL PORTS 3/4" UNF (SAE #8)
U6 = P AND T 3/4" UNF AND WORK PORTS 9/16" UNF
[04] CONNECTIONS
Note: There is a separate specification
sheet which utilizes metric units.
U8
THREAD
• Reference position [12] calls out the
system flow and can be listed in LPM or
GPM depending on which spec sheet you
are using (23 is entered for flow).
STACK POS
# 1
# 2
INLET
WORK SECTION
pos
description
12 Max. Inlet flow (GPM)
15 Type of Inlet
pos
description
• Reference position [15] gives you an
option for a standard type inlet “I” or
an unloader type inlet cover “IU” (“I” is
entered for std inlet cover).
47 Circuit type
23
I
50 Spool actuator
16 Main relief valve
51 Lever Bracket / handle
51C Clevis or Handle location
52 Spool pos. indication
60 Spool function
PB
140
23
17 Pressure setting (PSI)
17C Relief Flow Setting (GPM)
24 Tank connection T1
25 Tank connection T2
26 Pump connection P1
27 Pump connection P2
P/N SECTION
• Reference position [16] indicates the type
of main relief valve: (“PB” is the code for
a pilot operated RV).
T1
62 Piston head side
76A Port A valve
T2B
P1B
P2
• Reference position [17] Enter desired
relief valve setting (140 bar is entered).
76B Port B valve
• Reference position [17C] Enter desired
flow for relief valve setting (23 l/min is
entered).
88A Restrictor on port A
88B Restrictor on port B
P/N MCH. CAST
SPACER SECTION
• Reference position [24-27] calls out the
inlet/outlet porting (machined/plugged)
options:
90 Spacer Section
MID INLET
93 Mid Inlet type
T1 is the top tank port open.
94 Main relief valve
98 Pressure setting (PSI)
98C Relief Flow Setting (GPM)
T2B is code for side tank port plugged.
P1B is code for top inlet port plugged.
P2 is code for top inlet port open.
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information
VO40
Valve Assembly – General Information
The VO40 has two basic thread versions - UNF (SAE) or BSP.
[04] – Connections Thread
G
3/8 BSP Inlet, Outlet & Work Ports.
U
9/16" UNF (SAE-6) Inlet, Outlet & Work Ports.
9/16" UNF (SAE-6) Work Ports, 3/4" UNF (SAE-8) Inlet/Outlet Ports.
3/4" UNF (SAE-8) Inlet, Outlet & Work Ports.
U6
U8
[05] – System Voltage To be determined when the solenoid option is released
[07] – Surface Treatment (Paint)
X
P
No Paint.
Paint valve black.
[08] – Customer Designated ID: Enter Customer Part Number
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Inlet Cover
VO40
The inlet cover of VO40 is available in two versions. One is the standard inlet and the other is an inlet with a sole-
noid pump unloader (in development). The porting location options for the standard inlet are:
1) Top/side – inlet and outlet ports. Any unused ports can be plugged.
2) Top – inlet and outlet ports only.
All inlet bodies have a gage port, that comes plugged. SAE #4 (7/16"x20 UNF thread) or 1/4" BSP.
The coding to specify an inlet cover is accomplished by eight fields, as shown below:
[12] – Max Pump Flow
The pump inlet flow can be selected in LPM or GPM.
[15] – Type of Inlet
I
Standard Inlet.
IU
Inlet with pump unload, solenoid actuated (in development).
[24] to [27] – Inlet Porting Options
1) Standard – Top & Side Inlet/Outlet Ports
2) Standard – Top Inlet/Outlet Ports
OUTLET
INLET
INLET
OUTLET
GAGE
TANK
GAGE
TANK
TANK
OPEN
CENTER
OPEN
CENTER
INLET
PARALLEL
PATH
PARALLEL
PATH
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Inlet Cover
VO40
[16] - Main Relief Options
PS
PB
Adjustable main pilot-operated relief.
Adjustment range: 50 to 300 bar (725 to 4300 PSI).
Adjustable main pilot-operated relief
(Tamperproof aluminum cap).
Adjustment range: 50 to 300 bar (725 to 4300 PSI).
PN
PA
Adjustable main direct-acting relief.
Adjustment range: 60 to 207 bar (900 to 3000 PSI).
Adjustable main direct-acting relief
(Tamperproof aluminum cap).
Adjustment range: 60 to 207 bar (900 to 3000 PSI).
Y
Y plug (cavity machined and plugged).
[17] – Pressure Setting – Enter pressure setting (PSI or Bar)
Note: Relief valve code PN and PA max setting is
207 bar (3000 PSI).
[17C] – Relief Flow Setting
Flow in LPM or GPM.
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Outlet Cover
VO40
The VO40 outlet cover is available in two versions: Standard or with pilot generation and regulation for proportional
solenoid applications.
The standard outlet has two porting configurations available:
1) Top and side outlet ports along with machining for conversion to power-beyond or closed-center.
2) Top outlet only.
The coding to specify an outlet is made by four fields as shown below:
[30] – Type of Outlet
US
Standard.
USP With pilot-pressure generation (to be used on solenoid valves) (in development).
[33] to [35] – Outlet Porting Options
2) Top Oulet Port Only
1) Top and Side Oulet Ports
OUTLET
OUTLET
OUTLET
TANK
TANK
OPEN
CENTER
OPEN
CENTER
OUTLET
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Outlet Cover
VO40
[33] to [35] – Outlet Porting Options
Closed-Center
Power-Beyond
OUTLET
OUTLET
OUTLET
TANK
OUTLET
TANK
CLOSED
OPEN
OPEN
CENTER
POWER
BEYOND
CENTER
CENTER
PLUG
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Work Sections
VO40
The VO40 valve can be supplied in combinations from one to ten work sections. For each work section there is
a variety of spool options, actuators, positioners and port accessories. Work sections can have parallel, series,
and/or tandem circuitry. All types can be combined in the same valve assembly.
All work sections with hold in neutral spools have transition checks (load checks). All work sections with free flow
in neutral spools (motor) do not include transition checks (load checks). Contact Parker if you require a deviation
from this configuration.
Work sections are available with or without work port option machining. Integrated pilot-operated checks (Lock-
Out) are available in a specially machined casting (ordering code on page 20 [76 A/B]). A spacer section which
provides for more spacing between sections is also available (ordering code on page 20 [90]).
Examples of work port machining options:
Section without RV Cavities
Section with RV Cavities
Section with PO Checks
The VO40 Pilot-Operated Check (Lock-Out) sections
provide near zero leakage and can prevent cylinder
drift when the spool is in the neutral position. When
the spool is shifted to a power position, oil is directed
to one work port. Return oil is momentarily blocked
until pilot pressure unseats the check (3.1:1 ratio). With
207 bar (3000 PSI) load, it will require 67 bar (968 PSI)
into the opposite work port to unlock.
The spool is a 4-way, 3-position free flow spool which
prevents system pressure leakage from building up
and unlocking the PO checks.
The coding to specify a work section is made by 11 fields, as shown below:
[47] – Work Section Circuitry
P
T
S
Parallel Circuitry.
Tandem Circuitry – Provides priority to upstream sections.
Series Circuitry– (In development).
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Work Sections
VO40
[50] – Spool Actuators
C
CD
C
Spring centered to neutral position.
CD
Spring centered with dual control.
CHA2 Two position detent – spool “IN”.
Detent in neutral and “A” positions.
CHA2
CHB2
CHB3
CHB2 Two position detent – spool “OUT”.
Detent in neutral and “B” positions.
CHB3 Three position detent.
B2A Spring centered with “IN” detent.
Detent in “A” position and spring centering
to neutral position.
B2A
B2B
B2C
B2B Spring centered with “OUT” detent.
Detent in “B” position and spring centering
to neutral position.
B2C Spring centered with detent in two
positions “A” & “B”.
CB
PC
CB
Spring centered with detent in fourth
position, used with float spool.
PC
EC
Hydraulic Remote Actuator – Proportional.
Solenoid Operated – Proportional.
(in development)
ED
Solenoid Operated – On/Off.
ACP Pneumatic actuator – single ended.
The pneumatic actuator for the VO40 allows the
spool to be operated by a pneumatic signal. The
pneumatic actuator is assembled onto one side
of the work section and the opposite end is open
and available for the addition of a handle. A min.
of 5.5 bar (80 PSI) is required. The threaded
ports are both 1/8" NPT.
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Work Sections
VO40
[51] – Lever Bracket Note: Handle Levers are sold separately (see PN listed below)
SH
SR
Standard enclosed handle bracket.
Standard enclosed handle bracket, but rotated 180 degrees.
/
No bracket, no handle, no boot (female clevis on spool).
LU
No bracket, but with boot protector at spool end
(female clevis on spool).
MJL Mechanical Joystick – left side version (must be placed on two adjacent work sections).
MJR Mechanical Joystick – right side version (must be placed on two adjacent work sections).
Handle Rod Assembly is sold as a separate line item PN: K-VO40-H1.
[51C] – Spool Clevis or Handle Bracket Location
This field is used to indicate the location of the handle lever and bracket assembly –
adjacent to port “A” or port “B” side of the work section.
A
B
Spool Clevis or Handle Bracket on port “A” side.
Spool Clevis or Handle Bracket on port “B” side.
[52] – Spool Position Indication
/
Without spool position indicator.
SD
With micro-switch on-off indicator (in development).
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Work Sections
VO40
[60] – Spool Function
D
Double-acting (4-way) spool. Work ports blocked in the
neutral position.
EA
EB
M
Single-acting (3-way) spool. Port “A” blocked in neutral.
Port “A” is active and Port “B” is plugged.
Single-acting (3-way) spool. Port “B” blocked in neutral.
Port “B” is active and Port “A” is plugged.
Double-acting (4-way) spool. Work ports open to tank in the
neutral position. Note: A work section with this spool does
not have a transition check (load check).
F
Double-acting (4-way) spool with a 4th position in which
both work ports are connected to tank (float position).
Work ports are blocked in the neutral position.
DM
Double-acting (4-way) spool. Work port pressure is bled to
tank, when the spool is in the neutral position.
Bleed notch is designed for 1.9 LPM @ 69 bar.
(0.5 GPM @1000 PSI)
DA
DB
Double-acting (4-way) spool. Work port “A” pressure is bled
to tank, when the spool is in the neutral position.
Bleed notch is designed for 0.5 GPM @1000 PSI.
(1.9 LPM @ 69 Bar)
Double-acting (4-way) spool. Work port “B” pressure is bled
to tank, when the spool is in the neutral position.
Bleed notch is designed for 0.5 GPM @1000 PSI.
(1.9 LPM @ 69 Bar)
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Work Sections
VO40
[62] – Piston Head Side of Cylinder
The default for this field is code M. Codes A and B are only used when asymmetrical spools must be developed.
For example, a cylinder that requires meter-in for one direction and meter-out for the other.
M
A
B
Standard symmetrical spool- cylinder or motor.
Piston head connected with port “A”.
Piston head connected with port “B”.
Anti-Cavitation
Check
RV/AC Non-Adjustable
[76 A/B] – Work Port Valves
This pertains to the work port accessory options.
/
Port not machined.
Y2
N2
( )
Relief Valve cavity plugged.
Anti-cavitation valve.
Y plug for blocking
RV/AC Non-Adjustable: Enter Pressure setting (PSI or Bar).
Note: RV Set at 10 LPM (2.6 GPM).
RV cavity
C2
Pilot-Operated Checks (Lock-out valve).
Refer to page 16.
[88 A/B] – Work Port Option
/
No Restrictor.
Work port restrictors restrict flow in one direction
and are free flow in the opposite direction.
Restrict flow “out” of actuator “into” work port.
Restrict flow “out” of work port “into” actuator.
ACTUATOR
METER IN
ACTUATOR
METER OUT
P1 = 1mm (0.040")
P2 = 2mm (0.080")
N1 = 1mm (0.040")
N2 = 1mm (0.080")
P3 = 3mm (0.120")
N3 = 1mm (0.120")
P4 = 4mm (0.160")
N4 = 1mm (0.160")
[90] – Spacer Section
N
Spacer Section.
This section connects the open center, parallel path
and tank cores between two adjacent work sections.
This section is used to provide additional spacing
between two work sections. All other fields in the
work section code can be left blank. (Contact Parker
for size options available.)
TANK
TANK
OPEN
CENTER
OPEN
CENTER
PARALLEL
PATH
PARALLEL
PATH
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Open-Center Directional Control Valve
Catalog HY17-8505/UK
Ordering Information – Mid-Inlet
VO40
The VO40 mid-inlet options are split or combined flow. They are available with a main RV option. There is also a
provision for an outlet port on the split flow version only.
The coding to specify a mid-inlet is made by three fields as shown below:
Mid-Inlet
Relief Valve
Combined Flow, C3
Split Flow, C5
Mid-Inlet
Pump Port
INLET
Optional
Outlet Port
C5 Only
INLET
OUTLET
TANK
TANK
TANK
TANK
OPEN
CENTER
OPEN
CENTER
OPEN
CENTER
OPEN
CENTER
PARALLEL
PATH
PARALLEL
PATH
PARALLEL
PATH
[93] – Mid Inlet Options
C3
C5
Combined Flow (Port “A” inlet - Port “B” is plugged and not available to tank).
Split Flow (Port “A” inlet - Port “B” is optional tank port).
[94] – Main Pressure Relief
Y
Without pressure relief (cavity machined and plugged).
PA
Direct-acting relief valve non-adjustable.
[98] – Pressure Setting - Enter pressure (PSI or Bar)
[98C] – Mid-Inlet Relief Flow Setting
Flow in GPM or LPM.
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Extensive Hydraulic Product Offering
Accumulators
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Parker’s unique IQAN ap-
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well-tested hardware with
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Self-contained with a motor,
Standard and custom
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industrial and mobile
applications.
nal valving, load hold checks
and relief valves.
Filtration
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Full line of high and low
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into a single manifold.
up to 1700 Nm of torque.
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The most complete line of
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Broad line of energy- ef-
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Hydraulics Group
Sales Offices
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International
Austria
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Parker Hannifin is the world’s premier supplier of motion and control systems and
solutions, with sales and manufacturing facilities throughout the world. For product
or call free on 00800 2727 5374.
Catalogue HY17-8505/UK
POD 04/2007 PC
© Copyright 2007
Parker Hannifin Corporation
All rights reserved
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