Walvoil SDS180/1/AC(XG-250)/28L/RE is a Mobile Hydraulic Control Valve in SDS180 Series.As a Hydraulic Spool Valve,it adopts manual control,160 L/min rated flow and 31.5 MPa rated pressure.With 1 working section,it suits hydraulic drill rig systems,construction equipment and agricultural machinery.

　　What Is a Hydraulic Directional Control Valve?

　　A Hydraulic Directional Control Valve is a component that directs the flow of hydraulic fluid to designated actuators,controlling the start and stop,movement direction,and speed of actuators in a hydraulic system.In mobile machinery,it functions as the core command center linking the hydraulic pump to functions such as cylinder extension,motor rotation,and hydraulic tool operation.

　　Directional control valves are categorized by construction into monoblock and sectional types.Monoblock valves integrate all spools in a single cast housing,while sectional valves bolt individual working sections together.The sectional design enables the number of sections to be configured from 1 to 12 units,with each section controlling one independent hydraulic function.

　　The Walvoil SDS180 Series is a sectional directional control valve for open-center and closed-center hydraulic systems on mobile equipment.This family also includes load-sensing variants for drill rigs and industrial material handling platforms.

　　Key Specifications

　　Valve Configuration:1 Working Section

　　Rated Flow:160 L/min

　　Rated Pressure:31.5 MPa(315 bar)

　　Maximum Pressure:35 MPa(350 bar)

　　Main Relief Valve Setting:25 MPa(250 bar)

　　Control Method:Manual Lever Control

　　Center Position Function:Closed Center(per manufacturer datasheet)

　　P Port(Inlet):G3/4 inch

　　A Port(Output):G3/4 inch

　　B Port(Output):G3/4 inch

　　T Port(Tank):G1 inch

　　Operating Temperature Range:-15°C to+80°C

　　Operating Viscosity Range:12 to 400 mm²/s(cSt)

　　Material-Housing:Special Cast Iron

　　Material-Spool:Steel

　　Seal Material:NBR

　　Contamination Level:-/19/16 per ISO 4406

　　Internal Leakage:Approx.5 cm³/min at 100 bar

　　Tie Rod Tightening Torque:40 Nm

　　Mounting Type:Sectional,Tie Rod Assembly

　　Approvals:CE

　　Compatible Hydraulic Fluids:Mineral oil-based hydraulic fluids per ISO 11158

　　Technical Highlights

　　Manual lever control provides direct responsiveness.The operator generates spool displacement through a direct mechanical linkage,achieving proportional flow control without the pilot pressure supply or electronic control unit required by electro-hydraulic alternatives.

　　Closed-center spool prevents drift under neutral condition.In the neutral position,the spool blocks both the pump-to-cylinder and cylinder-to-tank flow paths,effectively locking the actuator position during load-holding applications such as drill mast positioning.

　　Sectional tie-rod construction enables field-configurable circuit design.Individual working sections are clamped together with 40 Nm torque on tie rods,allowing the entry of additional sections for extra hydraulic functions without replacing the complete valve assembly.

　　Cast iron housing with steel spool delivers structural rigidity.The special cast iron body withstands 31.5 MPa continuous system pressure while the hardened steel spool resists wear from contaminated hydraulic fluid,supporting extended operational cycles in mining and construction environments.

　　Wide viscosity tolerance adapts to temperature extremes.The 12 to 400 mm²/s operating viscosity range accommodates both cold-start conditions in winter equipment and high-temperature operation during continuous duty cycles,where the oil temperature rises from ambient to 80°C.

　　Applications

　　Hydraulic drill rig control:Directs hydraulic flow to the rotary head drive motor and feed cylinder circuits at rated 160 L/min flow capacity.The SDS180 variant with load-sensing capability(DLS7)mounts on horizontal and vertical drilling platforms for mast positioning and drill string manipulation.

　　Construction machinery actuation:Controls hydraulic cylinders and motors on excavators,backhoe loaders,and compact loaders.The modular sectional design scales from 1 to 12 spools,matching the hydraulic circuit complexity of different machine sizes per manufacturer datasheet.

　　Agricultural loader implement control:Manages lift arm cylinders,bucket tilt cylinders,and auxiliary hydraulic attachments.The closed-center spool configuration holds cylinder position when the lever returns to neutral,preventing uncontrolled implement drift.

　　Crane and material handling equipment:Operates boom extension,winch,and outrigger circuits on truck-mounted cranes and aerial work platforms.Tie-rod assembly supports field maintenance access to individual sections.

　　Municipal vehicle hydraulic systems:Controls compactor blades on trash trucks and hook-lift mechanisms on container handling vehicles,where direct manual control provides tactile feedback for precision operation in confined urban environments.

　　Selection Guidance

　　Select when the hydraulic system requires manual lever control with closed-center spool configuration for single-function directional control at 160 L/min maximum flow.

　　Select when the system operates within 31.5 MPa continuous pressure rating and G3/4 inch(P,A,B)and G1 inch(T)port sizes match existing hydraulic plumbing.

　　Select when the ambient temperature remains within-15°C to 80°C range and hydraulic fluid viscosity falls between 12 and 400 mm²/s.

　　Not recommended for applications requiring electro-hydraulic proportional control.Consider Walvoil SDS180 variants with electro-hydraulic actuation or a separate proportional directional valve for closed-loop position or force control.

　　Not recommended for flow rates exceeding 160 L/min.For higher flow demands(up to 240 L/min),select the Walvoil SD25 series sectional valve,which offers the same sectional construction with larger flow capacity.

　　Not recommended for systems operating on fire-resistant hydraulic fluids without manufacturer verification of seal material compatibility.

　　FAQ

　　1.What is the lead time and delivery time for the Walvoil SDS180/1/AC(XG-250)/28L/RE?

　　Manufacturer standard lead time is 4 to 6 weeks for non-stock configurations.Beijing Zhongping Technology maintains inventory of commonly specified SDS180 series valves and dispatches stocked units within 1 to 3 business days.We recommend contacting us directly to confirm current stock availability for this specific part number.

　　2.How much does the SDS180/1/AC(XG-250)/28L/RE cost?What is the price range?

　　The Walvoil SDS180 series sectional valves typically range from 800to1,800 USD per assembly depending on the number of sections and configuration.Prices fluctuate due to exchange rates,tariffs,and factory adjustments.For an accurate quotation with current pricing and shipping costs,contact Beijing Zhongping Technology directly.

　　3.What are the port sizes and dimensions of this sectional valve?

　　P,A,and B working ports are G3/4 inch(BSPP).The T tank return port is G1 inch.The tie-rod assembly configuration means that overall dimensions vary with the number of sections;the single-section SDS180/1 unit measures approximately 90 to 110 mm in width,depending on the specific inlet and outlet element combination.

　　4.Is the SDS180/1/AC(XG-250)/28L/RE in stock and available for immediate shipment?

　　We stock Walvoil SDS180 series sectional valves at Beijing Zhongping Technology for fast fulfillment.Availability for this specific configuration depends on current inventory rotation.Manufacturer warehouses in Italy maintain over 1,000 units of SDS180 series components,as confirmed through distribution channel data.

　　5.What warranty period applies to the SDS180 sectional valve?

　　We provide a 1-year warranty against manufacturing defects on all Walvoil SDS180 series products.An extended 2-year warranty option is available upon request.Warranty claims require return of the defective unit for inspection;Beijing Zhongping Technology processes warranty evaluations within 5 business days of receipt.

　　6.What payment terms and shipping methods do you accept?

　　We accept bank wire transfer(T/T)and irrevocable letter of credit(L/C)at sight.For qualified corporate accounts,Beijing Zhongping Technology offers net 30 payment terms upon credit approval.Orders ship by air freight(3-5 business days transit)or sea freight(4-6 weeks transit)based on customer preference and urgency.

　　7.How do I install and plumb the SDS180/1/AC(XG-250)/28L/RE?

　　Mount the valve assembly on the machine frame using the factory-provided tie-rod mounting points.Connect P port to the hydraulic pump pressure line using G3/4 inch BSPP fittings,A and B ports to the actuator work ports with G3/4 inch fittings,and T port to the tank return line with G1 inch fittings.Tighten tie rods to 40 Nm torque before pressurizing the system.All ports use BSPP parallel threads requiring bonded seal washers or O-ring face seals for leak-free connections.

　　8.What is the return policy and RMA process for Walvoil SDS180 valves?

　　Returns require prior authorization through our RMA process.Beijing Zhongping Technology processes RMA requests within 48 business hours of receipt.Non-standard configured valves(specially machined spools or custom relief settings)are non-returnable.Standard catalog configurations are eligible for return within 30 days,subject to inspection for installation damage or contamination.

　　9.How do I find a replacement or alternative if the SDS180/1/AC(XG-250)/28L/RE is discontinued?

　　The SDS180 series remains in active production with no discontinuation notice.For alternative configurations,the Walvoil SDS180 series supports cross-compatible inlet elements,working sections,and outlet elements.For higher flow requirements,select the SD25 series with 240 L/min capacity.For load-sensing applications on drill rigs,the DLS180 variant provides the same sectional construction with LS capability.Beijing Zhongping Technology provides cross-reference assistance for legacy system upgrades.

　　10.What duties,tariffs,and customs documentation apply when importing the SDS180/1/AC(XG-250)/28L/RE?

　　The HS code for hydraulic directional control valves is 8481.20.International shipments dispatch from Italy under Incoterms EXW(Ex Works)or FCA(Free Carrier)per factory terms,with freight,insurance,duties,and applicable VAT payable by the buyer.Beijing Zhongping Technology provides the commercial invoice,packing list,and certificate of origin required for customs clearance.We also offer DDP shipping terms for select destinations where all import costs are included in the quotation.