Walvoil SD5/6-P(KG3-160)/18L/18L/18L/18L/18L/18L/AET is a 6 Spool Hydraulic Multiway Valve of the Sectional Hydraulic Valve type.Operating at a rated pressure of 31.5 MPa and flow of 45 L/min,it is designed for manual directional control in hydraulic systems for the metallurgical industry,ship hydraulics,and engineering equipment.Key features include G3/8"PABT ports and an AET end terminal.

　　What Is a Sectional Hydraulic Multiway Valve?

　　A Sectional Hydraulic Valve,also known as a sectional directional control valve,is a modular assembly where individual spool sections are bolted together between an inlet and an outlet cover to form a complete valve bank.Each section controls one actuator,allowing flexible configuration of hydraulic circuits as required.This contrasts with one-piece monoblock valves,which offer a fixed number of sections and cannot be customized after manufacturing.

　　The Walvoil SD5/6-P is a 6-spool manual directional control valve within the SD5 series.This section of the valve plate adopts a fully closed conversion plate.The"18L"designation typically refers to the spool type or functional characteristics of each section,with the AET end plate providing specific functions such as pressure relief or anti-shock features for the overall assembly.

　　Key Specifications

　　Number of Spools:6

　　Valve Type:Sectional Multiway Directional Control Valve

　　Rated Pressure:31.5 MPa

　　Rated Flow:45 L/min

　　Control Method:Manual(hand lever)

　　Port Size:G3/8"for all P(Pressure),A,B(Working),and T(Tank)ports

　　Section Configuration:6 working sections,all designated"18L"

　　End Terminal Type:AET

　　Mounting Surface Specifications:With conversion plate

　　Maximum Operating Pressure:31.5 MPa(per manufacturer design)

　　Flow per Section:45 L/min

　　Spool Return Mechanism:Spring return(standard)

　　Body Material:High-grade cast iron

　　Seal Type:Standard hydraulic seals compatible with mineral oil

　　Oil Type Compatibility:Mineral oil based hydraulic fluid

　　Ambient Temperature Range:-20°C to+60°C

　　Design Standard:Conforms to ISO 4401 dimensional interface for sectional valves

　　Typical Application Industries:Metallurgy,marine&offshore,construction machinery,mobile hydraulics

　　Technical Highlights

　　Closed-center conversion plate enables internal pilot supply.The valve body integrates a special conversion plate that allows internal provision of pilot control pressure.This eliminates the need for an external pilot pressure source and simplifies hydraulic circuit design,reducing potential leakage points in mobile and industrial applications.

　　High pressure rating supports demanding duty cycles.With a rated pressure of 31.5 MPa and a matching maximum operating limit,the valve is designed for continuous operation in heavy industries such as steel mills and shipboard systems,where pressure transients and sustained loads are common.

　　All 18L spools provide consistent metering characteristics.Each of the six sections is configured with the 18L spool type,which typically offers a specific flow versus spool displacement curve optimized for predictable actuator control.This consistency simplifies operator training and ensures uniform control feel across all functions.

　　AET end terminal provides integrated safety functions.The AET end plate incorporates an adjustable pressure relief valve and can include anti-cavitation check valves.This protects the entire valve bank from pressure spikes above 31.5 MPa and prevents backflow,enhancing system reliability without external protection components.

　　G3/8"straight thread ports ensure reliable high-pressure sealing.All PABT ports use the G3/8"(BSPP)standard,a parallel thread that seals on a bonded washer or O-ring seat.This is preferred over tapered threads for high-pressure mobile hydraulics,as it reduces the risk of port cracking and provides vibration-resistant sealing up to the valve’s maximum pressure rating.

　　Standardized oil ports enable symmetrical piping.Because all four threaded oil ports(P,A,B,T)share the identical G3/8"size,they allow fully symmetrical piping.This simplifies stocking of fittings and hoses for both OEM installation and field maintenance.

　　Applications

　　Metallurgical industry hydraulic systems:Controls hydraulic cylinders on furnace tilting mechanisms,continuous casting withdrawal straightening units,and roll gap adjustment systems.The 31.5 MPa pressure rating matches the high force requirements of steel processing equipment.

　　Marine and ship hydraulics:Manages steering gear control,crane functions,and stabilizer fin actuators on vessels.The G3/8"ports with bonded washer sealing provide reliable leak-free operation under shipboard vibration and inclination conditions.

　　Construction and engineering equipment hydraulics:Operates outriggers,boom functions,and attachment circuits on drilling rigs,piling machines,and concrete pump trucks.The sectional design allows future reconfiguration if an additional function must be added.

　　Mobile hydraulic equipment:Provides directional control for agricultural machinery and material handling vehicles.Compact modular construction fits within mobile equipment space constraints while serving up to six double-acting actuators.

　　Selection Guidance

　　Suitable applications:

　　Systems requiring 6 independent manually operated directional control functions at up to 31.5 MPa pressure and 45 L/min flow

　　Applications where the modular sectional design is preferred for service flexibility—individual sections can be replaced without discarding the entire valve bank

　　Retrofit projects involving metallurgical or marine equipment originally designed for Walvoil SD5 series valves,ensuring dimensional and hydraulic compatibility

　　Not recommended for:

　　Electrohydraulic control requirements.The SD5/6-P with manual levers is not suited for remote or automated operation.For CAN bus or proportional control,consider Walvoil’s SD series with electrohydraulic piloting or a full electrohydraulic sectional valve.

　　Flow demands consistently exceeding 45 L/min per section.The rated flow of 45 L/min defines the operating envelope for efficient control.For higher flow systems,evaluate Walvoil’s larger SD8 or SD9 series rated for higher flow rates to avoid excessive pressure drop.

　　Single-function or dual-function circuits.A 6-spool bank with 18L spool configuration represents overcapacity and cost for simple hydraulic circuits where a smaller monoblock valve would suffice.

　　FAQ

　　1.What are the overall dimensions and mounting specifications for the Walvoil SD5/6-P?

　　The SD5/6-P is a sectional assembly whose length depends on the number of spool sections.The 6-spool configuration with AET end terminal measures approximately 360 to 400 mm in total length.Mounting is via threaded holes on the inlet and outlet covers;a conversion plate provides the specific mounting interface.

　　2.What is the delivery time or lead time for the SD5/6-P valve?

　　Manufacturer standard lead time is 6 to 8 weeks for a configured 6-spool assembly.We maintain stock of common SD5 components at Beijing Zhongping Technology;assemblies from existing inventory ship within 5 business days.

　　3.Is the SD5/6-P(KG3-160)in stock or built to customer order?

　　The SD5/6-P with six identical 18L spools and AET end plate is typically built to order,as end-user configuration varies widely.We stock SD5 individual sections and frequently assemble this exact configuration for metallurgical and marine clients,allowing faster fulfillment for repeat orders.

　　4.What payment terms do you accept for purchasing the SD5/6-P?

　　We accept bank wire transfer(T/T)and letter of credit for international orders.For qualified corporate accounts in China,Beijing Zhongping Technology offers net 30 payment terms upon credit approval.Advance payment is required for first-time custom-configured valve assemblies.

　　5.How much does the Walvoil SD5/6-P cost?

　　The SD5/6-P 6-spool valve assembly typically ranges from 3,200to5,100 USD depending on spool types,seal materials,and end plate options.Prices fluctuate due to exchange rates,tariffs,and raw material adjustments.For an accurate quotation with your specific configuration,contact Beijing Zhongping Technology directly.

　　6.What is the spare parts availability for the SD5/6-P after installation?

　　We supply individual 18L spool sections,seal kits,lever assemblies,and the AET end terminal as standalone spare parts.Common wear items such as O-ring kits and spool seals are maintained in stock.Beijing Zhongping Technology also provides a recommended spare parts list with initial delivery.

　　7.What warranty and after-sales service is provided for the SD5/6-P?

　　We provide an 18-month warranty covering manufacturing defects from the date of shipment.Warranty extension up to 36 months is available.Beijing Zhongping Technology offers commissioning support,technical documentation in English and Chinese,and warranty replacement within 72 hours of verified defect notification.

　　8.What are the customs and import duties for importing the SD5/6-P?

　　The HTSUS code is 8481.20.0080 and ECCN classification is EAR99.Shipments are dispatched under Incoterms CPT(Carriage Paid To)with commercial invoices and packing lists provided for customs clearance.Duties,VAT,and applicable import taxes are payable by the buyer at the destination.

　　9.What is the return policy for the SD5/6-P if it is not the correct configuration?

　　Custom-configured sectional valves are non-returnable unless a manufacturing defect is confirmed.We strongly recommend that first-time purchasers verify the full hydraulic schematic with Beijing Zhongping Technology application engineers before order confirmation to ensure correct spool types and end terminal selection.

　　10.Can the SD5/6-P be reconfigured if I need to change spool type or add more sections later?

　　Individual spool sections within the SD5/6-P assembly can be replaced,and the valve bank can theoretically be extended by adding sections.We recommend consulting Beijing Zhongping Technology for tie rod length and sealing requirements.Adding sections may require new tie rods and longer assembly bolts,which we can supply as a retrofit kit.