SCX120
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control focused - technology driven

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 • ual tank rails that connect in each section D 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...

control focused - technology driven Technical Description, Product Features & Benefits 4 Standard Spool Flow Rates 6 Standard Spool Pressure Drops (Inlet to Work Port) and Compensator Performance 7 Standard Spool Pressure Drops (Work Port to Outlet) 8 Inlet Section Assembly Options 9-10 Spool Section Assembly Options 11-16 Outlet Section Assembly Options 17-18 Relief Valves, End Mechanisms and Kits 19-23 Appendix 1 Open Center versus Closed Center 24 Appendix 2 Post-Compensated versus Pre-Compensated 25

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 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...

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...

(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...

SCX120 STANDARD SPOOLS WORK PORT FLOW VERSUS PUMP-LS DIFFERENTIAL PRESSURE 300 Full Flow Work Port Flow (lpm) Pump-LS Differential Pressure (bar) SCX120 STANDARD SPOOLS WORK PORT FLOWS VERSUS TRAVEL Full Flow Spool

SCX120 STANDARD SPOOLS INLET TO WORK PORT PRESSURE DROP 70 120 lpm (32 gpm) Spool Full Flow Spool 30 lpm (8 gpm) 40 15 lpm (4 gpm) Spool Spool 5 lpm (1 gpm) 30 Spool Work Port Flow (lpm)

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 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 Work Port Flow (lpm) Work Port Flow (lpm)

NLET SECTION ASSEMBLY OPTIONS 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 • See table below for port options OUTLET PORT LOAD SENSE RELIEF PORT INLET PORT LOAD SENSE

SCX121-C INLET SECTION ASSEMBLY (UNLOADER / BYPASS COMPENSATOR INLET) • Designed for use with fixed displacement pumps • nlet comes standard with an inlet I pressure relief valve cavity machined for the 60360 series relief valve, 61056 relief valve or 61650 shut off plug • ee table below for port options S IInlet to Outlet Pressure Differential (psid) • nlet comes standard with a load I sense relief valve cavity machined for the 56903-1 load sense relief valve IInlet to Outlet Pressure Differential (bar) • nloader has a standard 15 bar (215 psi) U bias spring to create pump-to-LS...

All SCX120 catalog spool section assemblies come with the following standard features: • • • • 1 -1/16-12 (SAE 12) Work Ports W ork port circuit relief valve cavities machined for both “A” port and “B” port I ndependent load hold check I ndependent compensator spool 3-position spool section assemblies are available with the following control options: • • • • M anual, spring-centered Hydraulically pilot operated Proportional or on/off electrohydraulically operated Electrohydraulically operated with manual lever The following options are available for 3-position section assemblies: •...

SPOOL SECTION ASSEMBLY ORDERING NOMENCLATURE 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