HAWE GR GS Series Directional Seat Valve | GR2-2 GR2-12 GS2-1 | Leak-free Solenoid Valve

The GR and GS Series electromagnetic directional seat valves by Chengyuan Hydraulic are zero-leakage control components fully compatible with HAWE industrial standards. This range includes key models such as GR2-2-G24, GS2-1, and GR2-12-GM24. Unlike traditional spool valves, the GR/GS series utilizes a ball or cone-seat sealing structure to achieve zero leakage even under high-pressure states. The valves feature a high-strength all-steel body and are driven by oil-immersed solenoids for maximum switching reliability and pressure resistance. All units offer 100% original-place interchangeability and undergo 100% simulated condition testing to ensure sealing integrity under high-frequency operation matches the original HAWE quality.

Technical Specifications :

• Core Models: GR2-1, GR2-2, GS2-2, GS2-12, GR2-12

• Max Operating Pressure: $45\text{ MPa (450 bar / 6500 psi)}$

• Max Flow Rate: Approx. $6\text{ to } 25\text{ L/min}$ (Based on size 1, 2, 3)

• Sealing Type: Cone or Ball seat (Zero leakage)

• Control Voltage: G24 (24V DC), GM24 (With rectifier plug), GZ3 (Specific connection)

• Switching Time: $20\text{ to } 50\text{ ms}$ (High-speed response)

• Temperature Range: $-40\text{°C}$ to $+80\text{°C}$

• Housing Material: Case-hardened all-steel body

Key Technical Advantages:

• True Zero-Leakage Performance: Unlike traditional spool valves with clearance leakage, the GR/GS series uses micro-ground ball or cone interfaces for metal-to-metal forced sealing. This is essential for pressure-holding applications like hydraulic outriggers, accumulator shut-offs, and clamping devices.

• High-Pressure Capability (450 bar): The heat-treated all-steel body provides extreme mechanical strength. Even with frequent switching at full $45\text{ MPa}$ pressure, the internal sealing surfaces remain free of plastic deformation, ensuring an exceptionally long service life.

• Oil-Immersed Solenoid Durability: The solenoid armature moves within an oil-filled chamber, providing automatic lubrication and superior heat dissipation. This eliminates the wear common in dry-type solenoids, allowing for over a million stable cycles with G24 or GM24 connections.

• Superior Contamination Resistance: The seat valve design features larger opening gaps, making it less sensitive to micro-particles in the oil. It is far less likely to jam compared to precision spool valves, significantly improving system uptime in harsh environments.

Application Areas:

• Clamping Mechanisms: Reliable pressure maintenance for machine tool fixtures and robotic grippers.

• Lifting Platforms: Preventing gradual descent of hydraulic cylinders due to internal leakage.

• High-Pressure Test Rigs: Pressure shut-off for air-tightness or strength testing systems.

Expert Maintenance Tips:

• Connector Selection: For GM24 models, ensure the use of a rectified plug (if connecting to AC) and verify the seal gasket’s integrity to maintain IP65 protection.

• Torque Control: HAWE-series subplate mounting requires high surface flatness. Use a torque wrench for mounting bolts—recommended torque is $9\text{–}12\text{ Nm}$ to prevent housing distortion.

• System Bleeding: During initial startup of a pressure-holding system, perform several no-load switches to bleed air from the valve cavity, preventing transient pressure spikes caused by air compression.