SCX120 - HUSCO InternationalHUSCO International

SCX120
TECHNOLOGY DRIVEN
•
CONTROL FOCUSED
SSL-1001 Rev. 4/11 Supercedes Rev. 3/11
Benefits/Features of SCX120
Improved efficiency means more work with less fuel
• Designed to minimize pressure drops
• High flow / low pressure drop capability in a compact package
• Dual tank rails that connect in each section
Increased productivity by improving vehicle controllability
• Multi-function flow sharing, even when flow demand exceeds flow supply
• Pressure compensation provides consistent flow rates, regardless of load pressure
SCX120 Applications
Earthmoving Equipment
• Precise metering capabilities
Simplified hydraulic system with features integrated into the main control valve
• Manual, hydraulic pilot operated, electrohydraulic, pneumatic control options
Tractor Loader Backhoes
• Low leakage capabilities
• Works with fixed displacement or variable displacement PCLS pumps
• Optional priority inlet for steering or other priority functions
• Multiple outlet options including integrated pressure reducing valve for supplying pilot pressure to internal EH
Crawlers
solenoids and to external pilot control circuits
• Integrated on-off solenoid to control pilot pressure supply for safety cut-out
• Optional dual hydraulic pilot and electrohydraulic control
• Ability to integrate electrohydraulic side shift clamp valve or ISO to
Excavators
SAE pattern select controls for tractor loader backhoes
• Optional LMI circuitry for cranes
• Manual levers available with E-H actuation
Wheel Loaders
Low cost of ownership by utilizing a robust cost effective design
• Cost effective electrohydraulic sections have EH solenoids installed directly into the spool housing – no bolt-on
blocks or remote manifolds required
• High pressure ratings for NFPA or ISO standards
Material/Personnel Handling Equipment
• Universal spools can be used in any type of spool section
• No load sense shuttles required, simplifying valve assembly and service
• Integrated filter screens on electrohydraulic proportional pressure reducing valves and load sense relief valves
Telehandlers
Complete Valve Family
• SCX120 is part of the SCX Platform which satisfies applications from 120-300 lpm. SCX is available in three
sizes: SCX120, SCX180 and SCX300.
Aerial Work Platforms
SCX 1 2 0
TAB L E OF C ON T E N T S
SCX120 Cut Aways
Technical Description, Product Features & Benefits
Standard SCX120 Spools
Standard Spool Flow Rates
Standard Spool Pressure Drops (Inlet to Work Port) and Compensator Performance
Standard Spool Pressure Drops (Work Port to Outlet)
Inlet Section Assembly Options
Spool Section Assembly Options
Outlet Section Assembly Options
Relief Valves, End Mechanisms and Kits
HUSCO Overview
HUSCO Worldwide
Notes
3
4
5
6
7
8
9-10
11-16
17-18
19-23
26
27-28
29-30
Appendix 1
Appendix 2 24
25
Open Center versus Closed Center
Post-Compensated versus Pre-Compensated
SCX 1 2 0 C UTAWAY S
INLET SELECTION CUTAWAY
Load Sense Relief Valve Cavity
Top Outlet Port
Top Inlet Port
Main Relief Valve Cavity
Sump Port
Inlet Gauge Port
Optional End Inlet Port
Load Sense Port
Optional End Outlet Port
ELECTROHYDRAULIC SPOOL
SECTION CUTAWAY
“B” Work Port
“A” Work Port
Auxiliary Port
Electrohydraulic Proportional
Pressure Reducing Valve
Sump Passage
Universal Spool
Design
Pilot Pressure Supply Passage
Supply Passage
Tank Passage
Low Pressure or Tank Pressure
Compensator Spool
Load Sense Passage
Load Hold Check
Auxiliary Pump
Passage (LS Feed)
OUTLET SECTION CUTAWAY
Pilot Pressure Supply Plot
Sump Port
Optional Inlet Port
3
Optional Load Sense Port
Optional Outlet Port
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Pressure Reducing
Valve Cavity
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SCX 1 2 0
TEC HNIC AL D E S C R I P T I O N
The SCX120 is a closed-center, load-sensing, sectional control valve with post-pressure compensation that offers a wide range
of control options and flexibility. The SCX120 can be used with fixed displacement pumps or with pressure-compensated, loadsensing variable displacement pumps and can be configured with one to ten working sections.
The load sense (LS) pressure in an SCX120 valve is generated by the compensator spool using the HUSCO patented IsoComp™
method to copy the LS signal using oil supplied by the pump instead of stealing oil from the function. Using pump oil to generate
the LS signal prevents function droop at the start of metering when a function is selected.
When multiple functions are selected, the SCX120 will automatically resolve the highest function load pressure, which is then
transmitted to the pump or inlet unloader (bypass compensator). This design eliminates the need for shuttles between sections,
simplifying the assembly of the valve and offers excellent flow sharing capability (the valve will maintain the ratio of flows to each
function, even when flow demand exceeds flow supply).
Each SCX120 valve comes with a load sense relief valve (LSRV) with an integrated pressure compensated drain function. The LS
drain ensures that LS pressure drains to tank once all spools are returned to the neutral position.
Each section assembly has a built-in pilot pressure supply rail and a sump rail on each side of the valve for use with
electrohydraulic (EH) proportional pressure reducing valves (EPRVs). It is recommended that the sump port be plumbed directly to
tank to minimize any back pressure that may affect electrohydraulic solenoid valves (a maximum sump pressure of 7 bar (100 psi) is
recommended).
Work port pressure limiting is accomplished by using the optional auxiliary relief valves. Each working section comes standard with
auxiliary relief valve cavities machined for both work ports.
See appendix page 1 for a comparison of closed center to open center valve systems.
See appendix page 2 for a comparison of post-compensated to pre-compensated valve systems.
SCX1 2 0
PRODUC T B E N E F I T S & F E AT U R E S
• Excellent multi-function flow sharing with
post-pressure compensation
• High flow, low pressure drop capability
• Compact size
• Dedicated electrohydraulic (EH) section
• Lever option for EH and pilot operated sections
• Universal spools can be used in manual, pilot
operated or EH sections
• Stroke limiter option
– Allows for reduced flow from a given spool
• Manual override adjustment screw option
– Allows a spool to be shifted in a dead-engine
situation
4
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STANDAR D S C X 1 2 0 S P O O L S
(INTERCHANGEABLE BETWEEN MANUAL, PILOT OPERATED AND ELECTROHYDRAULICALLY OPERATED SECTION ASSEMBLIES)
The SCX120 3-position spool is interchangeable between manual, pilot operated and electrohydraulically operated section
assemblies. Each spool is threaded at both ends, allowing any spool to be a left-handed or right-handed spool.
STANDARD SCX120 3-POSITION SPOOLS
Flow rates are based on a 15 bar (215 psi) pump to LS differential pressure.
Each spool is designed for the same flow rates for both work ports.
Spool Flow Rate
Cylinder Spool
Part Number
Restricted Motor
Spool Part Number
Full Motor Spool
Part Number
5 lpm (1gpm)
SCX12-S0001
SCX12-S0008
SCX12-S0015
15 lpm (4 gpm)
SCX12-S0002
SCX12-S0009
SCX12-S0016
30 lpm (8 gpm)
SCX12-S0003
SCX12-S0010
SCX12-S0017
50 lpm (13 gpm)
SCX12-S0004
SCX12-S0011
SCX12-S0018
80 lpm (21 gpm)
SCX12-S0005
SCX12-S0012
SCX12-S0019
120 lpm (32 gpm)
SCX12-S0006
SCX12-S0013
SCX12-S0020
Full Flow
SCX12-S0007
SCX12-S0014
SCX12-S0021
MANUALLY OPERATED
HYDRAULICALLY OPERATED
ELECTROHYDRAULICALLY OPERATED
5
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STANDAR D S P O O L F L O W R AT E S
SCX120 STANDARD SPOOLS
WORK PORT FLOW VERSUS PUMP-LS DIFFERENTIAL PRESSURE
300
Full Flow
250
Work Port Flow (lpm)
200
150
120 lpm (32 gpm)
Spool
100
80 lpm (21 gpm)
Spool
50 lpm (13 gpm)
Spool
50
30 lpm (8 gpm)
Spool
0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
15 lpm (4 gpm)
Spool
5 lpm (1 gpm)
Spool
25
Pump-LS Differential Pressure (bar)
SCX120 STANDARD SPOOLS
WORK PORT FLOWS VERSUS TRAVEL
180
Full Flow Spool
160
140
120 lpm (32 gpm) Spool
Flow (lpm)
120
100
80 lpm (21 gpm) Spool
80
60
50 lpm (13 gpm) Spool
40
30 lpm (8 gpm) Spool
20
15 lpm (4 gpm) Spool
5 lpm (1 gpm) Spool
0
0
1
2
3
4
5
6
7
Spool Travel (mm)
6
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STA NDAR D S P O O L P R E S S U R E D R O PS (IN LET TO W O RK PO RT)
AND C OM P E N S AT O R P E R F O R M A N CE
SCX120 STANDARD SPOOLS
INLET TO WORK PORT PRESSURE DROP
70
120 lpm (32 gpm)
Spool
Full Flow Spool
Pressure Differential (bar)
60
80 lpm (21 gpm)
Spool
50
50 lpm (13 gpm)
Spool
30 lpm (8 gpm)
40
15 lpm (4 gpm)
Spool
Spool
5 lpm (1 gpm)
30 Spool
20
10
0
0
20
40
60
80
100
120
140
160
180
200
Work Port Flow (lpm)
7
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STANDAR D S P O O L P R E S S U R E D R O PS
( WOR K P OR T T O O U T L E T )
INLET TO WORK PORT PRESSURE DROPS
SCX120 FULL FLOW SPOOLS
SCX120 FULL FLOW SPOOLS
INLET TO WORK PORT PRESSURE DROP – PUMPING INTO INLET HOUSING
INLET TO WORK PORT PRESSURE DROP – PUMPING INTO OUTLET HOUSING
100
100
90
90
80
70
Section 10
60
Section 1
50
40
30
Pressure Differential (bar)
Pressure Differential (bar)
80
70
Section 1
60
Section 10
50
40
30
20
20
10
10
0
0
0
20
40
60
80
100
120
140
160
180
0
200
20
40
60
80
100
120
140
160
180
200
Inlet Flow (lpm)
Inlet Flow (lpm)
WORK PORT TO OUTLET PRESSURE DROPS
SCX120 FULL FLOW SPOOLS
SCX120 FULL FLOW SPOOLS
WORK PORT TO OUTLET PRESSURE DROP – FLOWING OUT OF INLET HOUSING
WORK PORT TO OUTLET PRESSURE DROP – FLOWING OUT OF OUTLET HOUSING
100
100
90
90
80
Pressure Differential (bar)
Pressure Differential (bar)
80
70
60
50
40
30
Section 10
Section 1
20
70
60
50
40
30
Section 1
Section 10
20
10
10
0
0
0
20
40
60
80
100
120
140
160
180
200
0
Work Port Flow (lpm)
20
40
60
80
100
120
140
160
180
200
Work Port Flow (lpm)
8
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I NLE T S E C T ION A S S E M B LY O P T I O NS
SCX121-E INLET SECTION ASSEMBLIES
• Designed for use with variable displacement, pressure-compensated load-sensing pumps
• Inlets come standard with a load sense relief valve cavity machined for the 56903 load sense relief valve
• Inlet comes standard with an inlet pressure relief valve cavity machined for the 60360 series relief valve, 61056 relief valve or
61650 shut off plug
• See table below for port options
9
INLET SECTION
ASSEMBLY
END INLET PORT
END OUTLET PORT
LS
TOP INLET PORT
TOP OUTLET PORT
SCX121-A3
1-5/16-12 (SAE 16)
1-5/16-12 (SAE 16)
9/16-18 (SAE 6)
1-1/16-12 (SAE 12)
1-1/16-12 (SAE 12)
SCX121-A4
---
---
9/16-18 (SAE 6)
1-1/16-12 (SAE 12)
1-1/16-12 (SAE 12)
9
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I N L E T S E C T ION A S S E M B LY O P T I O N S
SCX121-C INLET SECTION ASSEMBLY (UNLOADER / BYPASS COMPENSATOR INLET)
• Designed for use with fixed
displacement pumps
• Inlet comes standard with an inlet
pressure relief valve cavity machined
for the 60360 series relief valve, 61056 relief
valve or 61650 shut off plug
• See table below for port options
0
10
20
30
40
50
60
25
350
300
20
250
15
200
150
10
100
5
50
0
0
50
100
150
200
0
250
IInlet to Outlet Pressure Differential (psid)
• Inlet comes standard with a load
sense relief valve cavity machined for
the 56903-1 load sense relief valve
Inlet Flow (gpm)
IInlet to Outlet Pressure Differential (bar)
• Unloader has a standard 15 bar (215 psi)
bias spring to create pump-to-LS
differential pressure
UNLOADER INLET (BYPASS COMPENSATOR) PERFORMANCE
Inlet Flow (lpm)
INLET SECTION
ASSEMBLY
END INLET PORT
END OUTLET PORT
LOAD SENSE PORT
TOP INLET PORT
TOP OUTLET PORT
SCX121-C3
1-1/16-12 (SAE 12)
1-5/16-12 (SAE 16)
9/16-18 (SAE 6)
1-1/16-12 (SAE 12)
1-1/16-12 (SAE 12)
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SPOOL S E C T IO N A S S E M B LY O P T I O N S
All SCX120 catalog spool section assemblies come with the following
standard features:
•
•
•
•
1 -1/16-12 (SAE 12) Work Ports
Work port circuit relief valve cavities machined for both “A” port and “B” port
Independent load hold check
Independent compensator spool
3-position spool section assemblies are available with the
following control options:
•
•
•
•
anual, spring-centered
M
Hydraulically pilot operated
Proportional or on/off electrohydraulically operated
Electrohydraulically operated with manual lever
The following options are available for 3-position section
assemblies:
• Auxiliary relief valve assemblies
• Spool stroke limiter assembly
• Spool manual override/stroke limiter assembly
TIE ROD KITS
11
The 62119 series of Tie Rod Kits include the
standard tie rod part numbers and nuts required
to build SCX120 valve assemblies. Tie rod kits
for valve stacks of eight, nine or ten section
assemblies come with compression washers
(recommended for stacks with eight or more
working sections).
Part Number
62119-001
62119-002
62119-003
62119-004
62119-005
Valve Assembly Size
1 Section
2 Sections
3 Sections
4 Sections
5 Sections
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Part Number
62119-006
62119-007
62119-008
62119-009
62119-010
Valve Assembly Size
6 Sections
7 Sections
8 Sections
9 Sections
10 Sections
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SPO OL S E C T IO N A S S E M B LY O P T I ON S
SPOOL SECTION ASSEMBLY ORDERING NOMENCLATURE
SCX122 -
SECTION CODE
SPOOL CODE
• The table below contains the SPOOL CODES for 3-position
Spool Type
Spool Flow Rate lpm (gpm)
Cylinder Spool
5 lpm (1 gpm) 15 lpm (4 gpm)
30 lpm (8 gpm)
50 lpm (13 gpm)
80 lpm (21 gpm)
120 lpm (32 gpm)
Full Flow
Restricted Motor
5 lpm (1 gpm)
15 lpm (4 gpm)
30 lpm (8 gpm)
50 lpm (13 gpm)
80 lpm (21 gpm)
120 lpm (32 gpm)
Full Flow
Full Motor
5 lpm (1 gpm)
15 lpm (4 gpm)
30 lpm (8 gpm)
50 lpm (13 gpm)
80 lpm (21 gpm)
120 lpm (32 gpm)
Full Flow
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Spool Code
001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
021
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12
SPOOL S E C T IO N A S S E M B LY O P T I O N S
3-POSITION, MANUAL, RIGHT-HANDED SECTION ASSEMBLIES
• Standard sections shipped as right hand
assemblies
• Convertable to left hand assemblies by
switching spool end components
SECTION CODE
A-A
WORK PORT
7/8-14 (SAE 10)
13
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SPOOL S E C T IO N A S S E M B LY O P T I O N S
3-POSITION, HYDRAULICALLY OPERATED SECTION ASSEMBLIES
• Section assemblies use 25 bar (360 psi) centering springs, for use with the
standard HUSCO pilot pressure controller
• See page 23 for spool stroke limiter and manual override options
SECTION CODE
A-B
WORK PORT
7/8-14 (SAE 10)
14
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SPOOL S E C T IO N A S S E M B LY O P T I O N S
3-POSITION, ELECTROHYDRAULICALLY OPERATED SECTION ASSEMBLIES
• Electrohydraulic section assemblies use HUSCO manufactured proportional pressure reducing valves (EPRV). The standard
section assemblies come with the 61534-12D20 installed, which have integrated Deutsch DT04-2P female connectors
• Section assemblies come with o-ring port plug assemblies installed in end pilot ports
• Standard section assemblies come with end pilot ports and 9/16-18 (SAE 6) o-ring port plug assemblies installed
• Pilot supply pressure feeding EH sections should be a minimum of 25 bar (362 psi) to ensure full spool shift.
• Maximum pilot supply pressure feeding EH sections should not exceed 250 bar (3,625 psi).
• Sump gallery connected to EPRV’s should not exceed 7 bar (100 psi).
• See page 23 for spool stroke limiter and manual override options
• See page 21 for other EPRV options
SECTION CODE
WORK PORT
E-A
7/8-14 (SAE 10)
15
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SPOOL S E C T IO N A S S E M B LY O P T I O N S
3-POSITION, ELECTROHYDRAULICALLY OPERATED SECTION ASSEMBLIES
• Electrohydraulic section assemblies use HUSCO manufactured proportional pressure reducing valves (EPRV). The standard
section assemblies come with the 61534-12D20 installed, which have integrated Deutsch DT04-2P female connectors
• Section assemblies come with o-ring port plug assemblies installed in end pilot ports
• Standard section assemblies come with end pilot ports and 9/16-18 (SAE 6) o-ring port plug assemblies installed
• Pilot supply pressure feeding EH sections should be a minimum of 25 bar (362 psi) to ensure full spool shift.
• Maximum pilot supply pressure feeding EH sections should not exceed 250 bar (3,625 psi).
• Sump gallery connected to EPRV’s should not exceed 7 bar (100 psi).
• See page 23 for spool stroke limiter and manual override options
• See page 21 for other EPRV options
SECTION CODE
E-B
WORK PORT
7/8-14 (SAE 10)
16
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O UTL E T S E C T IO N A S S E M B LY O P T I ON S
SCX123-A OUTLET SECTION ASSEMBLIES
• Outlets are available with the following options:
– No EH machining (end cover only)
– EH machining for pump pressure to feed EH pilot supply rails from internal pump rail*
*NOTE: when using pump pressure to directly supply EH sections, inlet pressure must be limited to 250 bar (3,625 psi), to prevent exceeding the maximum supply pressure to the EPRVs
– EH machining for external pilot pressure supply to be fed into SCX120 valve to feed EH supply rails
• See table below for port options
17
OUTLET
SECTION
ASSEMBLY
INLET END PORT
OUTLET END PORT
LOAD SENSE
PORT
PILOT PORT
SUMP PORT
SCX123-A2
---
---
---
---
---
SCX123-A3
1-1/16-12 (SAE 12)
1 5/16-12 (SAE 16)
9/16-18 (SAE 6)
---
---
SCX123-A4
---
---
---
9/16-18 (SAE 6)
9/16-18 (SAE 6)
SCX123-A5
1-1/16-12 (SAE 12)
1-5/16-12 (SAE 16)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
SCX123-A6
---
---
---
9/16-18 (SAE 6)
9/16-18 (SAE 6)
SCX123-A7
1-1/16-12 (SAE 12)
1 5/16-12 (SAE 16)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
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OUTL E T S E C T IO N A S S E M B LY O P T I O N S
SCX123-B OUTLET SECTION ASSEMBLIES
• T he SCX123-B outlets come standard with machined cavity for pressure reducing valve for the purpose of generating a low
pressure pilot supply for EH spool sections and for supplying external devices such as pilot circuits - See page 22 for options.
• See table below for port options
OUTLET SECTION
ASSEMBLY
INLET PORT
OUTLET PORT
SUMP PORT
PILOT SUPPLY PORT
LOAD SENSE
SCX123-B4
1-5/16-12 (SAE 16)
1-5/16-12 (SAE 16)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
9/16-18 (SAE 6)
SCX123-B5
---
---
9/16-18 (SAE 6)
9/16-18 (SAE 6)
---
17
18
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REL IE F VALV E S , E N D M E C H A N I S MS A N D KITS
LOAD SENSE RELIEF VALVE AND DRAIN REGULATOR ASSEMBLY
The 56903 is the standard load sense relief valve for the SCX120 valve line. Installed into the inlet housing, it limits the
maximum LS pressure, which therefore limits the maximum inlet (P) pressure. 56903 also has an integrated pressure
compensated LS drain, which drains off LS pressure when none of the spools are selected. The relief valve is protected
against contamination with an integrated 100μ filter. 56903 has a setting range of 62 - 300 bar (900 - 4,350 psi).
The standard catalog setting for 56903 is 214 bar (3,100 psi) and can be adjusted to suit the requirements needed for
each application.
SURGE WORK PORT RELIEF VALVE ASSEMBLY
The 60360 Relief Valve Assembly is a direct acting relief valve with integrated anti-void (anti-cavitation) function and is the
standard work port relief valve option (shock valve). The 60360 can also be used in some inlet housings to prevent fast inlet
(P) pressure spikes from damaging the main control valve or the rest of the hydraulic system. Relief valves are set at 10 lpm
(2.6 gpm) and have a recommended maximum flow rate of 75 lpm (19.8 gpm). The relief valve setting is stamped on the RV
plug (for example: “200” = a setting of 200 bar (2,900 psi)).
Part Number
60360-120
60360-160
60360-200
60360-240
60360-280
60360-320
60360-345
Setting (bar)
120
160
200
240
280
320
345
Setting (psi)
1,740
2,320
2,900
3,480
4,060
4,640
5,000
ANTI-VOID (ANTI-CAVITATION) PERFORMANCE
Flow (gpm)
10
15
Flow (gpm)
20
0
Pressure Drop (bar)
350
19
5500
18.0
5000
16.0
4500
300
4000
250
3500
3000
200
2500
150
2000
1500
100
1000
50
500
0
10
20
30
40
50
60
70
10
20
30
40
50
250
14.0
200
12.0
150
10.0
8.0
100
6.0
4.0
50
2.0
0.0
0
0
Pressure Drop (bar)
5
Pressure Drop (psid)
0
400
0
80
Pressure Drop (psid)
20
40
60
80
100
120
140
160
0
180
Flow (lpm)
Flow (lpm)
Consult HUSCO Sales department for non-standard RV settings.
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REL IE F VALV E S , E N D M E C H A N I S M S A N D KITS
WORK PORT RELIEF VALVE ASSEMBLY
61056
The 61056 relief valve is an adjustable differential area relief valve designed to work in the as a work port relief valve or a
main relief valve for the SCX120 platform. The standard setting for the relief valve is 165 bar (2400 psi) set at 19 lpm (5 gpm).
The 61056 can be adjusted between 96 – 234 bar (1400 – 3400 psi). The max flow for the 61056 is 151 lpm (40 gpm). Please
contact the factory for more information.
WORK PORT ANTI-VOID (ANTI-CAVITATION) VALVE ASSEMBLY
AND SHUT-OFF PLUG ASSEMBLY
The 61400 is the standard anti-void assembly, designed to
prevent cavitation in the valve work port. The 61400 has “AV”
stamped on the plug.
The 61650 is the standard shut-off plug assembly, designed to
block off the work port RV cavity when no RV is required and
the inlet (P) pressure RV cavity when no inlet RV is required.
MANUAL LEVER ASSEMBLY
The 62107 manual lever assembly is available for use
with the SCX122-a-a family of sections. The 62123
handle assembly kit is available for use with the 62107
lever assembly or OEMs can provide their own handle to
mate with the simple thread interface.
20
62107
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REL IE F VALV E S , E N D M E C H A N I S M S A N D KITS
ELECTROHYDRAULIC PRESSURE REDUCING VALVES (EPRV)
HUSCO Electrohydraulic Pressure Reducing Valves (EPRV) are IP69 rated and come with an integraded 100μ filter on
the pilot pressure supply (“B”) gallery of the EPRV. HUSCO EPRVs work with a maximum supply pressure of 250 bar
(3,625 psi), require a 100 Hz PWM command signal and can operate in a temperature range of -30 C to 120 C (oil temp)
and -30 C to 80 C (amibent air temp). The EPRV electrical coil has a 100% duty cycle rating and a Class H insulation
rating. The sump port on the main control valve assembly should be connected to the system reservoir with a minimum
amount of back pressure (a maximum back pressure of 7 bar (100 psi) is reccommended). EPRVs can be used for either
proportional control or on-off (“bang-bang”) control. See table below for connector style, threshold current & pressure,
maximum current & pressure resistance characteristics.
61534 - 12D20
Connector Style
Deutsch DT04-2P
61534 - 12D25
Deutsch DT04-2P
61534 - 24D20
Deutsch DT04-2P
Deutsch DT04-2P
Amp Junior Power
Timer
EPRV Part No.
61534 - 24D25
61534 - 12A20
Connector Voltage
Color
(VDC)
Black
12
Natural
12
(beige)
Blue
24
Grey
24
Black
12
Resistance
at 20 C (Ω)
5.30 ± 0.27
Threshold
Current (mA)
600 ± 10
Maximum
Current (mA)
1500
Threshold
Control
Pressure (bar)
3.5 – 6.5
Maximum
Control
Pressure (bar)
20 – 25
5.30 ± 0.27
600 ± 10
1500
4.5 – 8.0
25 – 31
23.47 ± 0.40
23.47 ± 0.40
300 ± 10
300 ± 10
750
750
3.5 – 6.5
4.5 – 8.0
20 – 25
25 – 31
5.30 ± 0.27
600 ± 10
1500
3.5 – 6.5
20 – 25
ELECTROHYDRAULIC CONVERSION ASSEMBLY KIT
The 61482 Conversion Kits will plug the EH solenoid cavity on EH sections and
provides a port for connecting pilot pressure to the spool spring chamber in
order to shift the spool as a hydraulically pilot operated section.
The kit allows a section assembly to be “electrically prepared” (machined
for EPRV solenoid valves but built to be hydraulically pilot operated). When
a customer wants to update from pilot operated control to EH control, the
section can be easily upgraded to EH in the field without the need for a costly
valve removal.
21
Part Number
Pilot Port
61482-1
9/16-18 (SAE 6)
20
61482-2
ISO 1179-1 G1/4
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REL IE F VALV E S , E N D M E C H A N I S M S A N D KITS
PRESSURE REDUCING VALVE ASSEMBLY FOR PILOT PRESSURE SUPPLY
The 58108-10 pressure reducing valve reduces inlet (P) pressure down to down to a lower pressure pilot supply. It is
used in the SCX123-B Outlet Section Assemblies for SCX120 valve assemblies that require internal or external pilot
pressure supply. 58108-10 comes with 30 bar (435 psi) nominal pressure setting and can be adjusted between 10.3 bar
(150 psi) to 40.0 bar (550 psi). The valve is protected against contamination with an integrated 100μ filter.
A
PRESSURE REDUCING VALVE SHUT-OFF PLUG ASSEMBLY
A series of shut-off plug assemblies are available to plug the
pressure reducing valve cavity in SCX123-B Outlet Section
Assemblies, in case the pressure reducing valve is not required.
Part Number
400554*
400555
400587
Pilot Supply Source
Inlet Supply
External Supply 9/16-18 (SAE 6) Port
External Supply ISO 1179-1 G 1/4 Port
*Note: When using the 400554 Shut-Off Plug, inlet pressure must be limited to 250 bar (3,625 psi) maximum, to prevent exceeding the
maximum supply pressure supplied to the EPRVs.
END MECHANISM KITS FOR 3-POSITION HYDRAULICALLY PILOT OPERATED SECTIONS
The SCX120 end mechanisms for hydraulically pilot operated sections come standard with a 25 bar (360 psi) centering spring and
9/16-18 (SAE 6) o-ring ports for connecting to a hydraulic pilot joystick. Kits are available with three different porting options: end
port only, side port only, or both end port and side port.
23
E ND PORT ONLY SIDE PORT ONLY END AND SIDE PORT
62115
62115-1
62115-2
22
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REL IE F VALV E S , E N D M E C H A N I S M S A N D KITS
ADJUSTABLE STROKE LIMITER KIT AND MANUAL OVERRIDE KIT
The 62068 Manual Override Kit provides a way to manually shift a spool far enough to lower a machine implement in case of a
dead engine situation. It also provides the function of the adjustable stroke limiter and allows the manual override adjustment to
be made independent of the stoke limiting adjustment.
TANG END & SEAL PLATE KITS FOR MANUAL SECTIONS
62117
CLEVIS END & SEAL KIT
24
23
62118
TANG END & SEAL KIT
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A PPE NDIX 1
O PEN C E NT E R V E R S U S C L O S E D C E N TER
The following hydraulic circuits & graphs represent efficiency gains going from an open center valve with fixed displacement pump
to a closed center valve with inlet unloader (bypass compensator) with fixed displacement pump to a closed center valve with
pressure-compensated load-sensing variable displacement pump.
The following table compares the system costs and efficiencies of an open center system, a closed center system with unloader
(bypass compensator) and a closed center system with a pressure-compensated load-sensing variable displacement pump.
Open Center System
• Fixed displacement pump
• Pressure differential across spool depends on flow
25
System Cost
$
Unloader (Bypass Compensator) System
• Fixed displacement pump
• Unloader (bypass compensator) spool diverts excess flow
• Constant pressure differential maintained
$$
Pressure Compensated Load Sense System (PCLS)
• Variable displacement pump
• Load sensing valve
• Pump flow varied to maintain constant pressure differential
$$$
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Efficiency
24
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A PPE NDIX 2
P OST-CO MPENSAT E D V E R S US P R E -C O M P E N S AT E D
The following hydraulic circuits represent the basic design of post-pressure compensated and pre-pressure compensated closed
center valve systems.
There are several differences in the two styles of valve design, which are determined by the basic valve geometry and design.
The most noticeable difference however, is that post-compensated valves continue to offer excellent flow sharing when flow
demand exceeds flow supply, while pre-compensated valves will only meet the flow demands of the lowest loaded functions
(causing higher loaded functions to slow down or stop moving).
TRADITIONAL POST-PRESSURE COMPENSATED CIRCUIT
Key Features:
• Pressure differential acting on the compensator spool is
picked downstream of the main spool metering orifice
• Load sense signal from each function is picked up before the
load sense shuttle
• All compensator spools reference the same resolved load
sense signal
– Key feature for maintaining flow sharing
• Pump to load sense pressure differential is controlled by the
pump or the inlet unloader (bypass compensator)
Resulting Characteristics:
• When flow demand exceeds flow supply, the compensators
will split the pump flow to all functions proportional to the
main spool metering orifice of each spool
– Great flow sharing, even when exceeding flow supply.
• Maximum function pressure is limited using optional auxiliary
relief valves
– Load Sense pressure limiting on individual functions is not available
TRADITIONAL PRE-PRESSURE COMPENSATED CIRCUIT
Key Features:
• Pressure differential acting on the compensator spool is picked
from either side of the main metering orifice
• Load sense signal from each function is picked up after the
load sense shuttle
• Compensator spools reference a load sense signal picked
up before the load sense shuttle
– Allows load sense pressure limiting on individual functions
• Pump to load sense pressure differential is controlled by the
compensator springs
25
Resulting Characteristics:
• When flow demand exceeds flow supply, the lowest loaded
functions will take priority over the highest loaded function
– Highest loaded functions may stop moving, depending on
flow demand
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HUS C O OV E R V I E W
For over 60 years, HUSCO International has been designing and producing innovative and high performance hydraulic and
electrohydraulic products in the agriculture, construction, forestry and material handling industry. Today HUSCO control
products can be found on a variety of leading off-highway equipment throughout the world.
Dedicated to meeting and exceeding the changing control needs of the off-highway market for today and well into the
future, HUSCO employs an extensive engineering staff for the design of platform and customized products to provide costeffective solutions to maximize the efficiency, productivity, controllability and reliability of vehicles.
HUSCO’s extensive global engineering and vehicle fit-up and testing capabilities enable HUSCO to be an extension of OEM
engineering teams to provide fast response and efficient solutions to global and regional market demands. This reduces
product development cycles, improves the end product, and has led to HUSCO becoming a global hydraulic controls leader.
Visit the HUSCO website at www.huscointl.com for a complete list of HUSCO sales offices and distributors.
HUS C O WOR LD W I D E
European Headquarters
HUSCO International, Ltd.
6 Rivington Road
Whitehouse Industries Estate
Runcorn, Cheshire, England WA7
3DT
Phone:(44)-1928-701888
Fax: (44)-1928-710813
World Headquarters
HUSCO International, Inc.
2239 Pewaukee Road
Waukesha, WI 53188
Phone: 1-262-513-4200
Fax: 1-262-513-4514
Whitewater Operations
HUSCO International, Inc.
1116 Universal Boulevard
Whitewater, WI 53190
Phone: 1-262-513-4200
Fax: 1-262-513-4514
HUSCO Brazil
Iowa Operations
Rua Jaragua 397 sala 702
Porto Alegre RS 90-450-140
Brazil
Phone: (55)-51-3388-4367
Fax: (55)-51-3321-4291
HUSCO International, Inc.
104 Generac Drive
Maquoketa, IA 52060-0700
Phone: 1-262-513-4200
Fax: 1-262-513-4514
27
Locally Focused
www.huscointl.com
[email protected]
CO NT R OL F OCU S E D - T E C H N O L O GY D RIVEN
China Headquarters
HUSCO Hydraulics (Shanghai) Ltd.
No. 235 Jiangtian Road East
Song Jiang Industrial Zone
Shanghai, 201600
India Headquarters
HUSCO Hydraulics Pvt, Ltd.
Plot A4-Talegaon Industrial Area
Pune, maharastra 410507, India
Phone: (91)-2114-305314
Fax: (91)-211-4305400
Globally Driven
www.huscointl.com
28
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NO T E S
29
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N OT E S
30
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CONTROL FOCUSED TECHNOLOGY DRIVEN
THE SCX PLATFORM IS A FAMILY OF CLOSED CENTER POST-PRESSURE COMPENSATED
SECTIONAL VALVES DESIGNED SPECIFICALLY FOR THE CONSTRUCTION, MATERIAL
HANDLING, AND FORESTRY EQUIPMENT MARKETS. THE SCX PLATFORM IS AVAILABLE IN
THREE DIFFERENT SIZES: SCX120, SCX180 AND SCX300.
World Headquarters
HUSCO International, Inc.
2239 Pewaukee Road
Waukesha, WI 53188
Phone: 1-262-513-4200
Fax: 1-262-513-4514
European Headquarters
HUSCO International, Ltd.
6 Rivington Road
Whitehouse Industrial
Estate
Runcorn, Cheshire, England
WA7 3DT
Phone: (44)-1928-701888
Fax: (44)-1928-710813
www.huscoauto.com
China Headquarters
HUSCO Hydraulics (Shanghai) Ltd.
No. 235 Jiangtian Road East
Song Jiang Industrial Zone
Shanghai, 201600
P.R. China
Phone: (86)-21-5774-6468
Fax: (86)-21-3774-0186
HUSCO Brazil
Rua Jaragua 397 sala 702
Porto Alegre RS 90-450-140
Brazil
Phone: (55)-51-3388-4367
Fax: (55)-51-3321-4291
India Headquarters
HUSCO Hydraulics Private
Ltd.
Plot A4 - Talegaon Floriculture Ind. Estate - MIDC
Village - Navlakh Umbre,
Talegaon, Puna 410507,
India
Phone: (91)-2114-305314
2011 HUSCO International
www.huscointl.com
[email protected]
www.incova.com