Detailed Explanation of TOKYO KEIKI Check Valve C5G-825-JA-S160 (Right-Angle Type)

I. Complete Model Breakdown (C5G-825-JA-S160)

Angle Type Check Valves (Subplate Mounting Type)

• No mark: Petroleum-based hydraulic oil, water-glycol hydraulic oil

• F3: Phosphate ester hydraulic oil

• S51: With valve opening adjustment mechanism (for C2G-805)

• S160: With valve opening adjustment mechanism (for C2G-815 and C5G-825)

  Note: Max. operating pressure for special type numbers S51 and S160 is 14 MPa.

• C2G-805, C2G-815, C5G-815 can use unmarked metric threads and unified threads.

• For C5G-825:

• No mark: Unified thread (3/4-10 UNC)

• M: Metric thread (M20)

II. Core Technical Specifications

III. Structural Features & Core Functions

1. Structural Features

• Right-angle structure: Inlet and outlet ports are arranged at a right angle, suitable for piping turning in hydraulic systems, saving installation space. The optimized flow path design reduces flow resistance and lowers system energy consumption.

• Precision sealing design: High-precision fitting between spool and body, combined with NBR sealing components, results in extremely low internal leakage, effectively maintaining circuit pressure for pressure-holding applications.

• Stackable compatible mounting: JA mounting surface meets international standards; can be directly stacked on solenoid valves or hydraulic manifolds without extra piping, enabling convenient and neat installation, compatible with TOKYO KEIKI and other brand hydraulic units.

• High reliability: Manufactured in Japan, key components made of high-strength materials, shock-resistant and high-pressure resistant, suitable for frequent start-stop operations with long service life.

2. Core Functions

• One-way flow control: Allows hydraulic oil to flow only from the inlet (Port P) to the outlet (Port A); automatically blocks reverse flow to protect hydraulic pumps, control valves and other core components from backflow damage, serving as a basic protection element in hydraulic systems.

• Circuit pressure holding: Through reverse blocking, it helps maintain stable pressure in hydraulic circuits and prevents position drift of actuators (e.g., cylinders, hydraulic motors) caused by pressure leakage.

• Low pressure loss: Optimized flow path and precise cracking pressure setting ensure reliable one-way blocking while minimizing pressure loss during oil flow, improving overall system efficiency.

IV. Typical Application Scenarios

• Industrial machinery: Hydraulic circuits of injection molding machines, die-casting machines and hydraulic presses, to prevent oil backflow and protect pumps and actuators.

• Machine tools: Hydraulic systems of precision machine tools (grinders, milling machines, machining centers), assisting pressure holding to ensure machining accuracy.

• Construction machinery & marine hydraulic systems: Suitable for high-pressure conditions, preventing equipment failure due to oil backflow and enhancing system stability.

• Other medium- and high-pressure hydraulic units: Customized hydraulic power units and hydraulic circuits of automated production lines, acting as basic logic control elements to ensure normal system operation.

V. Installation & Operation Guidelines

• Mounting direction: Install strictly according to the arrow mark on the valve body, ensuring oil flow direction matches the arrow. Incorrect installation will block normal flow, disable one-way control and may damage equipment.

• Mounting torque: ISO 4401-05 standard mounting surface; bolt tightening torque shall be controlled at 12–15 N·m to ensure firm installation and avoid loosening or leakage caused by vibration.

• Oil cleanliness: Recommended oil cleanliness ≥ NAS 7 grade, equipped with 10–25 μm filter to prevent contaminants from entering the spool-body clearance, causing jamming or seal damage.

• Oil temperature control: Maintain operating temperature within -20°C ~ +80°C to avoid seal aging and oil viscosity reduction due to overheating.

• Media compatibility: Use only approved mineral oil or water-glycol; corrosive fluids are prohibited to prevent corrosion of the valve body and seals.

• Maintenance inspection: Regularly check spool operation. If jamming or leakage occurs, disassemble, clean or replace the spool and seals promptly to avoid system malfunction.