SD25/1 Directional Control Valve, 3 position double acting, A B Open at neutral, 240 lpm, max 315 bar

 

SD25/1 Directional Control Valve, 3 position double acting, A B Open at neutral, 240 lpm, max 315 bar

 

 

flow rate	240liters
number of spools	1 Spool
inlet section valve	side inlet, with relief valve
relief valve set pressure	315bar
inlet port size	G1
spool type	3 positon
handle side arrangement	standard handle
spool cap side arrangement	3 position double acting, A B Open at neutral
working section arrangement	standard type
work port size	G3/4
outlet section type	side outlet
outlet port size	G1

 

 

 

 

 

 

 

 

 

Directional Control Valve 20-380L, 100 - 350 BAR

 

 

Hydraulic Directional Control Valves – Fully Compatible with Walvoil, Hydrocontrol, Badestnost, and Other European and American Brands

We are a professional manufacturer of hydraulic directional control valves in China. Our products cover various control methods including manual, electric, pneumatic, electro-hydraulic, electro-electric, electromagnetic, and remote control. Flow rates range from 20 to 300 L/min, and pressures can reach up to 315 bar.

 

SD valve	Flow	Max Pressure	Spool
SD 25	240L/Min / 63 GPM	315 BAR	1-12 sections
SDS 180	160L/Min / 42 GPM	315 BAR	1-12 sections
SDS 380	380L/Min / 100 GPM	315 BAR	1-12 sections
SD 4	45L/Min / 11.8 GPM	315 BAR	1 section
SD 5	45L/Min / 11.8 GPM	315 BAR	1-7 sections
SD 45	45L/Min	315 BAR	1-7 sections
SD 55	45L/Min	315 BAR	1-7 sections
SD11	70 LPM / 19.6 GPM	315 BAR	1-5 section
SD14	120 LPM / 31.5 GPM	315 BAR	1 Section
SD18	160 LPM / 42 GPM	315 BAR	1-4 Section

 

 

Our hydraulic valves can completely replace or match mainstream Italian and European brands such as Walvoil, Hydrocontrol, and Badestnost. They are suitable for various applications including construction machinery, agricultural machinery, aerial work platforms, material handling equipment, and industrial vehicles.

 

 

I. Why should distributors, equipment manufacturers, and repair shops purchase from us?

 

1. Distributors: High profit margins and fast inventory turnover

 

Our hydraulic valves are priced at only 30%–50% of European and American brands, leaving ample profit margins for distributors. Flow rates cover 20–380 L/min, and the number of units can be expanded from 1 to 12 or more, providing one-stop coverage for various supporting needs from light agricultural machinery to heavy construction machinery. We also offer OEM customization services, supporting the creation of independent brands and helping distributors build long-term customer loyalty.

 

2. Equipment Manufacturers (OEM): Reduced procurement costs and optimized supply chain

 

Equipment manufacturers need core components that are reliable, have consistent parameters, and stable delivery times. Our hydraulic valves are fully compatible with European and American brands in terms of dimensions, mounting flanges, port specifications, pressure ratings, and flow curves, allowing direct replacement of existing configurations without modifying the host machine design. We support customization based on drawings—non-standard valve core functions, special port positions, different voltage solenoids, and corrosion-resistant coatings can all be adjusted as needed. Choosing us will reduce your procurement costs, shorten supply chain response time, and minimize the long waiting periods associated with imported brands.

 

3. Repair Service Provider: Complete Parts Supply, Fast Delivery

 

The repair market is most vulnerable to difficulties in sourcing parts, long lead times, and opaque pricing. We provide a complete range of easily damaged parts, including sealing kits, valve core assemblies, spring assemblies, and electromagnet coils. Standard products are shipped within 7-15 days, with ample stock and rapid response, helping repairers significantly reduce equipment downtime. Compared to the lengthy (60-90 days) after-sales service cycles of European and American brands, we offer a significant time advantage.

 

 

 

II. What are our advantages compared to European and American brands?

 

 

Advantage 1: Significant Price Advantage, Leading Cost-Effectiveness

 

Through industrial cluster effects and a vertically integrated supply chain (casting, CNC precision machining, valve core grinding, and integrated sealing components), our production costs are significantly lower than those of European and American manufacturers. Hydraulic valves with equivalent performance are priced at 30%-50% of European and American brands, without compromising quality. Domestic hydraulic valve products have achieved technology comparable to imported brands, while offering an unparalleled price advantage.

 

Advantage Two: Comprehensive Technical Parameter Comparison, Seamless Interchangeability

 

Our hydraulic valves are fully compatible with international brands in terms of pressure rating (up to 315 bar), flow range (20–380 L/min), number of units (1–12 units), and center-position functions. They can directly replace corresponding models from brands such as Walvoil, Hydrocontrol, and Badestnost. For example, the Walvoil SD5 series has a rated flow of 45 L/min, a pressure of 315 bar, and can be used in up to 7 units; our corresponding product parameters are completely compatible.

 

Advantage Three: Comprehensive Control Methods, Wide Coverage

 

Our products support multiple control methods, including manual, electric, pneumatic, electro-hydraulic, electrical, electromagnetic, and remote control. The electro-hydraulic control method combines the advantages of electronic and hydraulic technologies, continuously adjusting the valve core position by regulating the input electrical signal to precisely control the pressure and flow of the hydraulic system, ensuring high-precision operation in precision hydraulic systems requiring high control accuracy. From simple manual operation to complex remote automated control, we can provide matching solutions.

 

Advantage 4: Modular/Integral Structure Available, Flexible Adaptability

 

The modular multi-way valve adopts a building-block design, where each functional module can be flexibly combined according to actual needs. It is easy to disassemble and reassemble, offering powerful functionality and facilitating the addition or reduction of connections. The integrated multi-way valve features a compact structure, high rigidity, and excellent sealing, making it suitable for applications with limited installation space. Both structures can be customized with relief valves, replenishing valves, and combination valves to flexibly meet the needs of different host systems.

 

Advantage 5: Short Delivery Time, Stable Supply

 

European and American brands often have delivery cycles of 60-90 days, significantly affected by global supply chain fluctuations. Leveraging China's well-developed hydraulic component manufacturing ecosystem and our own stable production capacity, standard models can be shipped within 7-15 days, and bulk orders can be arranged for rapid production upon negotiation. For OEM manufacturers, this translates to shorter production wait times and faster market response capabilities.

 

Advantage 6: Complete Certifications, Unimpeded Export

 

Our products are ISO 9001 quality management system certified and meet international standards such as CE, enabling smooth export to global markets including Europe, North America, Southeast Asia, South America, the Middle East, and Africa. China's hydraulic components industry cluster has formed a highly specialized supply chain system, possessing advanced CNC machining centers, heat treatment lines, and fully hydraulic testing benches to ensure product dimensional accuracy and functional consistency.

 

 

III. Main Application Areas of Hydraulic Directional Control Valves

 

Directional control valves are the "nerve center" of a hydraulic system, used to control the flow direction, on/off state, and flow distribution of hydraulic oil. They are widely used in:

 

 

Construction Machinery: Excavators, loaders, bulldozers, road rollers, cranes, forklifts, telescopic forklifts, skid steer loaders, backhoe loaders, truck-mounted cranes, boom pump trucks, concrete mixers

 

Agricultural Machinery: Tractors, combine harvesters, balers, sprayers, fertilizer spreaders, lawn mowers, seeders, telescopic boom agricultural machinery

 

Aerial Workshops Industrial Platforms: Scissor lifts, Articulated boom lifts

 

Material Handling Equipment: Forklifts, Stackers, Pallet trucks, Lifting platforms, Winches, Hoists

 

Industrial Vehicles: Sanitation vehicles, Garbage compactors, Sweepers, Floor scrubbers, Mining vehicles

 

Forestry Machinery: Logging machines, Timber harvesters, Wood chippers, Weeders

 

 

Marine Machinery: Deck machinery, Steering gear systems, Anchor winches

 

Industrial Automation: Injection molding machines, Presses, Machine tools, Production line hydraulic systems

 

 

 

IV. Correct Use of Hydraulic Directional Control Valves

 

1. Selection Considerations

 

Before selecting a valve, please confirm the following key parameters are compatible:

 

Flow Rate Matching: The valve's rated flow rate must be ≥ 1.1–1.2 times the system's required flow rate (with a margin). Calculate the total maximum flow rate requirement of all actuators (hydraulic cylinders, motors) and select a matching valve specification. Avoid "underpowered" valves—insufficient flow rate can lead to valve overheating, leakage, or sluggish actuator operation.

 

Pressure Matching: The valve's rated pressure must be ≥ the system's highest working pressure, which can reach 315 bar.

 

Control Method: Clearly define the operating method (manual, electric, pneumatic, electro-hydraulic, etc.) and response speed requirements. Manual control is suitable for simple operating conditions; electro-hydraulic proportional control is suitable for automated systems; pneumatic control is suitable for explosion-proof environments.

 

Structural Form: Select either an integral (compact) or segmented (flexible expansion) design based on the installation space.

 

Neutral Position Function: Confirm the neutral position function type (e.g., neutral position closure, neutral position unloading, neutral position pressure holding, etc.) to ensure continuous and shock-free switching.

 

Port Specifications: Confirm the specifications and direction of the inlet/outlet and working ports (G thread, UNF thread, SAE flange, etc.) to facilitate pipeline layout.

 

 

2. Installation Requirements

 

Before installation, please verify that the nominal pressure, nominal flow rate, and spool valve function meet the hydraulic system requirements. Installation points include:

 

The mounting plate and bracket must be flat, and the tightening force of the mounting screws must be even to prevent valve body twisting.

 

For multi-way valves with multiple valve sections, ensure the double-ended threaded rod is tightened to the specified torque (usually 95–120 N·m). Insufficient tightening torque will cause oil leakage between the valve sections.

 

When installing the external valve operating mechanism, ensure the spool valve moves freely without jamming, and prevent lateral forces on the valve core.

 

When installing on machinery subject to severe vibration, vibration damping measures should be taken.

 

Correctly connect the inlet (P), return (T), and all working ports (A/B). High-pressure oil must never enter through the return port to avoid damaging the valve body.

 

System piping should not be too thin or long to prevent increased pressure loss and system overheating.

 

If welding is performed close to the valve, prevent weld spatter from damaging the O-rings, dust rings, and exposed parts of the spool valve.

 

 

 

3. Hydraulic Oil Requirements

 

The working oil should be clean, with a filtration accuracy not exceeding 10 μm. The highest contamination level of the hydraulic fluid should be no less than ISO 4406 19/16, with a viscosity range of 10–400 mm²/s and a temperature range controlled between -20°C and +80°C.

 

 

4. Daily Operation and Maintenance

 

Regularly check the oil level and cleanliness to prevent impurities from clogging the valve's orifices or gaps, causing jamming.

Replace the hydraulic oil and filter element every 500–1000 hours, depending on equipment operating conditions.

When the equipment is not in use for extended periods, it is recommended to periodically start the equipment and allow the valve to operate several times to prevent valve core jamming.

 

 

V. Common Problem Troubleshooting and Repair Methods

 

1. Spool Valve Cannot Reset or Positions Inaccurately

 

• Possible Causes | Solution
• Reset Spring Deformed | Replace Return Spring
• Positioning Spring Deformed | Replace Positioning Spring
• Positioning Sleeve Worn | Replace Positioning Sleeve
• Dirty Between Valve Body and Spool Valve | Clean Valve Body and Spool Valve
• Inflexible External Control Mechanism | Adjust Control Mechanism and Retighten Connecting Screws

 

 

2. External Leakage

 

• Possible Causes | Solution
• Aging or Damaged O-rings at Both Ends of the Reversing Valve Body | Replace O-rings
• Damaged O-rings Between Valve Body Contact Surfaces | Replace O-rings
• Insufficient Tightening Torque of Double-ended Screw in Multi-way Valves | Retighten to the Specified Torque (Approximately 120 N·m)

 

3. Unstable or Inability to Adjust Safety Valve Pressure

• Possible Causes | Solution
• Deformed Pressure Adjusting Spring | Replace High-Pressure Spring
• Weared Pilot Valve | Replace Pilot Valve
• Loose Lock Nut | Tighten Pilot Valve
• Clogged Damaging Orifice of Main Valve Core | Clean Main Valve Core to Clear Damaging Orifice
• Pool Malfunction (Insufficient Oil Supply) Hydraulic Pump Overhaul

 

4. The working mechanism noticeably sinks when the spool valve is in the neutral position.

• Possible Causes Troubleshooting
• Increased clearance between the valve body and spool valve due to wear Repair or replace the spool valve
• Spool valve misalignment Ensure spool valve alignment
• Wear or contamination at the cone valve Replace the cone valve or remove contaminants.

 

5. Multi-way valve malfunction (slow or no operation)

• Troubleshooting Direction Solutions
• Hydraulic oil contamination or blockage Thoroughly clean the multi-way valve and replace the filter
• Wear of internal valve core or seals Replace damaged parts
• Deteriorated hydraulic oil Completely drain the old oil and add new oil meeting standards
• Solenoid valve malfunction (electrically controlled valve) Check the solenoid valve coil and circuit; replace the solenoid valve if necessary
• High ambient temperature Improve working conditions to avoid the effects of high temperature on the valve
• Loose secondary pressure relief valve or blocked throttle orifice Check the secondary pressure relief valve and disassemble and clean the throttle orifice.

 

6. Maintenance Tips

• Before maintenance, a preliminary inspection should be performed: Check if the hydraulic oil is clean, if the oil level is normal, and if there is any obvious damage or leakage on the exterior of the multi-way valve.
• After disassembly and cleaning, check the condition of all valve cores, seals, and springs. Damaged parts must not be welded or straightened; they must be replaced.
• For electro-hydraulic/electro-hydraulic valves, check if the solenoid valve and related circuits are functioning properly.
• If internal damage is severe, it is recommended to replace the entire multi-way valve to ensure system safety.
• It is recommended to replace aged seals during maintenance to ensure the valve's performance is restored to factory settings.

 

 

VI. What problems can I help dealers, equipment manufacturers, and maintenance service providers solve?

 

 

What I can help distributors solve:

 

• Provide a stable supply of goods and competitive prices, enabling you to establish a price advantage in the local market.
• Support OEM branding and custom branding to help you build brand equity.
• Provide product catalogs, technical data, and market support to help you quickly open up the market.
• Sufficient stock of standard models to meet the fast delivery needs of small and medium-sized orders.
• Our after-sales technical team is always online to assist you in answering customer selection and technical questions.

 

 

What I can help equipment manufacturers (OEMs) solve:

 

• Help reduce the procurement costs of core components and increase the profit margin of the entire machine.
• Provide alternatives that are fully compatible with Italian brands in terms of size and performance, without requiring design modifications.
• Traffic coverage 20–380 Full L/min range, flexible configuration of 1–12 units to precisely match different host requirements.
• Small batch customization is available; non-standard configurations can be processed according to provided drawings (special valve core functions, non-standard oil ports, electromagnets with different voltages, special coatings, etc.).
• Stable supply and predictable delivery times (standard products shipped within 7-15 days) ensure your production schedule is unaffected by supply chain fluctuations.
• Assistance with system matching and on-site commissioning is provided to ensure stable operation after installation.

 

 

 What I can help repair service providers solve:

 

• Shorten parts waiting time – Standard products ship within 7-15 days, significantly reducing losses caused by equipment downtime.
• Provide complete sets of easily damaged parts, including sealing kits, valve core assemblies, spring assemblies, and electromagnet coils, offering a one-stop solution.
• Our technical team provides troubleshooting support and repair guidance to help improve your service efficiency.
• Transparent pricing, complete parts supply, and timely response help you build a good reputation among end customers.

 

 

VII. Welcome to purchase from us in China.

 

 

We are located in Shijiazhuang City, Hebei Province, and are a professional manufacturer of hydraulic directional control valves with many years of experience in hydraulic valve R&D and production. Our main products include:

 

• Hydraulic directional control valves (multi-way directional valves) – Manual, electric, pneumatic, electro-hydraulic, electro-electric, electromagnetic, and remote control options are available, with options for integral or segmented types. Flow rates range from 20–380 L/min, and pressures up to 315 L/min. bar
• Hydraulic Motors (OMM/OMR/OMT/OMV/BM3/BMR/BMRS/BMS/BMP/BMH/BMT, etc.)
• Full Hydraulic Steering Gear Series (101S/OSPC/OSPB/HKUS/BZZ-B, etc.)
• BK10 Series Static Wet Hydraulic Brakes

 

 

Choosing to source directly from our factory in China will give you:

 

• Competitive factory prices – eliminating middlemen
• Professional technical support – full assistance from selection to installation
• Stable supply guarantee – our own production line + mature supply chain
• Flexible customization capabilities – processing based on provided drawings, OEM customization

 

Our products are exported to many countries and regions worldwide, widely used in construction machinery, agricultural machinery, aerial work platforms, forestry machinery, marine machinery, and other fields, and are trusted by our customers.

 

We welcome global distributors, OEM manufacturers, and service providers to visit our factory in China to discuss cooperation. Whether you need sample testing, technical consultation, or bulk purchase, we will serve you with a professional attitude and high-quality products.

 

 

Contact us now to get our product catalog and pricing!

 

For the latest product specifications, selection guidance, and pricing, please contact our sales staff directly to obtain the official product manual and terms and conditions.