SD8 -2 Directional Control Valves

Product Overview

The SD8-2 Directional Control Valve is a core component designed for modern hydraulic systems, engineered to precisely regulate the direction, on-off, and flow of hydraulic fluid. As a premium hydraulic directional valve, it integrates advanced structural design and robust materials to meet the rigorous demands of industrial automation and mobile machinery. This valve features a compact structure that saves installation space while supporting two hydraulic system options—open center and closed center—to adapt to diverse circuit configurations. With versatile control modes and reliable performance, the SD8-2 serves as a critical link in optimizing hydraulic system efficiency and operational accuracy.

Core Selling Points & Benefits

Exceptional High-Pressure Resistance

Crafted with a high-hardness ductile iron valve body and 60HRC+ hardened valve core, the SD8-2 delivers outstanding high-pressure resistance up to 350bar. This feature ensures stable operation in harsh high-pressure environments, minimizing leakage and extending service life even under long-term high-frequency use.

Precision Control Performance

Adopting CNC precision machining technology, the valve achieves precision flow control with a repeatability of ±1%. Its optimized internal flow channel design reduces pressure loss, ensuring smooth fluid circulation and precise response to control signals, which is essential for automated production processes.

Multiple Control Modes

The SD8-2 supports diverse control methods including manual, solenoid, electro-hydraulic, and remote control. This flexibility allows seamless integration into various systems, from simple manual operations to complex automated workflows, enhancing system compatibility and operational convenience.

Durable & Low-Maintenance Design

With strong anti-pollution capability, the valve resists clogging and wear caused by impure hydraulic fluid. The modular coil design enables easy replacement without disassembling the entire valve, reducing maintenance time and costs. Additionally, its mute operation meets environmental requirements for low-noise workplaces.

Energy-Efficient Operation

By minimizing internal leakage and pressure drop, the SD8-2 improves hydraulic system energy efficiency. It reduces unnecessary power consumption, making it an eco-friendly choice for energy-conscious applications while maintaining top-tier performance.

Technical Specifications

Application Scenarios

Construction Machinery

Ideal for excavators, loaders, and bulldozers, the SD8-2 controls hydraulic cylinders for boom, bucket, and travel movements. Its high-pressure resistance and shock resistance adapt to rugged construction sites.

Agricultural Machinery

Widely used in tractors, combine harvesters, and planting equipment, it regulates the lifting of implements and precise flow for seeding/fertilizing systems, enhancing farming efficiency and operational accuracy.

Industrial Hydraulic Systems

Suitable for injection molding machines, stamping presses, and metallurgical equipment, the valve ensures precise control of mold clamping, injection speed, and roller adjustments, improving product quality and production stability.

Mining & Environmental Machinery

In mining trucks and sanitation vehicles, its robust design withstands dusty, high-vibration environments while maintaining reliable fluid control for loading, unloading, and waste handling operations.

Special Vehicles

Applied in aerial work platforms and fire trucks, it provides safe, precise control for lifting and positioning functions, ensuring operator safety and equipment stability.

FAQ

What hydraulic fluids are compatible with the SD8-2?

It works with mineral hydraulic oil (ISO VG 32-68) and high-water-based emulsion, ensuring compatibility with most standard hydraulic systems.

What installation requirements should be followed?

The mounting surface must meet ISO 4401 standards (Ra ≤ 0.8μm, flatness ≤ 0.01mm/100mm). Avoid direct exposure to heat sources and ensure correct connection of P (pressure), T (tank), A/B (working) ports.

How often does the valve require maintenance?

Routine inspection is recommended every 1000 operating hours, including checking for leaks, cleaning filters, and verifying coil connections. Hydraulic oil should be replaced per system requirements to maintain performance.

What makes the SD8-2 different from standard directional control valves?

Its combination of high-pressure resistance, multiple control modes, and compact design sets it apart. The anti-pollution structure and low-maintenance features also reduce downtime compared to conventional valves.

Is there a warranty for the SD8-2?

We offer a 12-month warranty covering manufacturing defects. Proper installation, operation, and maintenance as per the manual are required to validate the warranty.