Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of sd8 series sectional directional valve in China, also supports customized service. If you're going to wholesale high quality sd8 series sectional directional valve made in China, welcome to get pricelist from our factory.
Product Introduction
The SD8 Series is a sectional directional valve designed for hydraulic systems to control the direction, pressure, and flow of hydraulic oil. It is built with a modular sectional structure, where each section controls one independent hydraulic circuit. By moving the manual lever, the spool shifts inside the valve body, opening or closing internal passages to direct hydraulic flow to actuators such as cylinders and motors. The valve also integrates a main relief valve and load check valves to protect the system from overpressure and prevent reverse flow caused by load weight.
Features & Technical Advantages
Modular sectional design: Supports 1–12 sections, allowing flexible configuration for different circuits and easy expansion or replacement of individual sections.
High pressure capability: Maximum operating pressure up to 315 bar (35 MPa), suitable for construction, agricultural, and mobile hydraulic systems.
Low internal leakage: Internal leakage is controlled within 15 cc/min at 160 bar, 50°C, helping maintain system pressure and reduce energy loss.
Wide temperature range: Ambient temperature from -40°C to +80°C (-40°F to +176°F) for reliable operation in cold and hot environments.
Corrosion resistance: Valve surface is phosphated and passes a 48-hour neutral salt spray test, suitable for humid, dusty, and outdoor working conditions.
Direct manual control: Lever-to-spool connection provides intuitive feedback, ideal for mobile equipment requiring precise on-site operation.
Technical Specifications
| Parameter | Value | Application Value |
|---|---|---|
| Control Method | Manual | Direct operation for mobile equipment and field control |
| Pressure Medium | Mineral oil based hydraulic oil | Compatible with most mobile hydraulic systems |
| Nominal Flow | 80 L/min | Supports medium-to-large actuators and multi-circuit operation |
| Viscosity Range | 12 cSt – 400 cSt | Wide viscosity tolerance, no extra preheating required |
| Operating Pressure | 315 bar (35 MPa) | Matches high-pressure circuits for demanding loads |
| Internal Leakage | 15 cc/min at 160 bar, 50°C | Maintains stable pressure and reduces pump idle work |
| Ambient Temperature | -40°C to +80°C (-40°F to +176°F) | Suitable for cold and high-temperature environments |
| Valve Structure | Sectional Valve | Modular expansion and individual section replacement |
| Valve Surface | Phosphating treatment | Anti-rust and corrosion resistance for outdoor use |
| Valve Sections | 1–12 Sections | From simple single-action circuits to complex multi-actuator systems |
| Rustproof Level | Neutral salt spray test, 48 hours | Meets general industrial anti-corrosion requirements |
| Relief Valve Setting | 250 bar (as per hydraulic schematic; customizable) | Protects system from overpressure |
| Port Thread | M10 (as per drawing; other options available) | Ensures compatibility with standard hydraulic fittings |
| Mounting | 4-M8-6H mounting holes (as per drawing) | Secure installation on manifolds or machine frames |
Applications
The SD8 Series sectional directional valve is widely used in:
Construction machinery: Compact excavators, skid steer loaders, wheel loaders - boom, bucket, and swing control.
Material handling: Forklifts, telehandlers, aerial work platforms - lifting and tilting control.
Agricultural machinery: Tractor hydraulic output, harvester header lifting, baler multi-circuit control.
Industrial vehicles: Street sweepers, garbage compactors - hydraulic actuator control.
Typical customer needs: Multi-circuit independent control, medium-to-high pressure, and direct manual operation. For example, a loader operator can control boom and bucket with two levers using a 2-section SD8 configuration.
Installation & Maintenance
Installation requirements: Mounting surface must be flat and clean. Tighten bolts diagonally and evenly. Connect P (inlet), T (return), and A/B (work ports) according to the hydraulic schematic.
Commissioning procedure: Before start-up, ensure oil cleanliness (NAS 10 or better). Increase pressure slowly and check each section for smooth operation. Confirm relief valve setting matches system requirements.
Operation notes: Check for external leakage at section joints regularly. If the lever feels stuck, inspect the spool for contamination or wear.
Daily maintenance: Replace seals (O-rings, bonded washers) every 2–3 years or according to actual working conditions. If the spool is scratched, replace the corresponding section.
Technical support: Selection guidance, hydraulic schematic confirmation, and installation instructions are available.
Model Comparison
| Series | Structure | Nominal Flow | Max Pressure | Key Difference | Typical Application |
|---|---|---|---|---|---|
| SD8 | Sectional | 80–90 L/min | 315–350 bar | Modular, 1–12 sections | Multi-actuator mobile hydraulic systems |
| SD11 | Sectional | 75 L/min | 315 bar | Slightly lower flow, 1–7 sections | Medium flow, fewer circuits |
| P80 | Monoblock | 80 L/min | 315 bar | Compact cast body | Fixed circuits, space-limited equipment |
| SD180 | Sectional | 160 L/min | 315 bar | High flow for large equipment | Large construction machinery |
Why Choose Us
Company Background
Shijiazhuang Laive Import & Export Trading Co., Ltd. belongs to Hebei Wendefu Hydraulic Technology Co., Ltd. Founded in 1988, we are a high-tech enterprise focusing on R&D, production, and sales of hydraulic valves, directional valves, pressure valves, flow valves, accessories, and special components.
Manufacturing Capability
35 years of pressure valve component manufacturing experience
200+ professional team members in production management and technical R&D
10,000+ containers of precision products shipped annually
Products exported to 20+ countries
Quality Control
At least 10 inspection procedures before shipment
ISO9002 certified since 2000
Phosphated valve surface with 48-hour neutral salt spray test
Service
OEM/ODM customization: provide your drawing and requirements
Standard order: 10–14 business days; stock available: 2–3 business days
Shipping: sea freight, air freight, international express (DHL, FEDEX, UPS)
FAQ
Q: Are you a trading company or manufacturer?
A: We are a manufacturer. Our factory belongs to Hebei Onederful Hydraulic Technology Co., Ltd.
Q: Are OEM services available?
A: Yes. Please provide your drawing and specific requirements. We can configure section number, control method, port size, and other options.
Q: How to make payment?
A: PayPal, Western Union, Money Gram, or T/T transfer
Q: How long does it take to process orders?
A: Usually 10–14 business days for no stock; 2–3 business days if stock is available.
Q: What is the packing method?
A: Small pieces: carton box. Large pieces: export-grade plywood case.
Q: How do I choose the number of sections?
A: Choose according to the number of independently controlled actuators. For example, for boom and bucket control, a 2-section valve is sufficient.
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