DRV DRVP DV DVP Series Hydraulic Throttle Check Valve | Rexroth Replacement | DRVP12-1-10B DRV12 | High Pressure 350 Bar

The DRV/DRVP/DV/DVP Series by Chengyuan Hydraulic is a high-performance flow control solution designed for precision speed regulation in hydraulic circuits. While the DV/DVP types provide bi-directional throttling, the DRV/DRVP types feature an integrated check valve for controlled flow in one direction and free flow in reverse. Engineered to be 100% interchangeable with Rexroth 10B/12B technical standards, these valves are manufactured using high-strength alloy steel and precision grinding techniques. Every unit undergoes 100% simulated condition testing to ensure linear adjustment and zero-leakage performance under pressures up to 350 bar (35 MPa), making them the premier choice for demanding industrial and mobile applications.

Technical Specifications 

• Series Code: DRV (In-line Throttle Check) / DRVP (Subplate Throttle Check) / DV (In-line Throttle) / DVP (Subplate Throttle)

• Nominal Sizes (NG): 6, 8, 10, 12, 16, 20, 25, 30, 40

• Max Operating Pressure: 35 MPa (350 bar / 5076 psi)

• Check Valve Cracking Pressure: 0.05 MPa (0.5 bar)

• Max Flow Rate: Depends on size (e.g., NG12/DRVP12 supports approx. 100 L/min)

• Operating Temperature: -20°C to +80°C

• Adjustment Type: Hand knob with graduated scale and locking set screw

• Seal Material: NBR (Standard) or FKM (Viton)

Key Technical Advantages

• Superior Adjustment Linearity: The spool features a parabolic throttling profile, ensuring that the flow gain remains highly linear relative to the handwheel rotation. This allows for precise micro-adjustment at low flow rates, eliminating control dead zones.

• Hardened Anti-Erosion Spool: The throttling spool undergoes induction hardening and nitriding, reaching a hardness of over HRC 60. This provides exceptional resistance to cavitation and erosion caused by high-velocity oil flow under high pressure differentials.

• Visual Scale Indicator: The adjustment knob is equipped with a color-coded ring and numerical scale. This visual feedback allows engineers to quickly record and replicate specific flow settings, ensuring consistency across multiple machines.

• Heavy-Duty Check Valve Design: In the DRV/DRVP series, the integrated check valve is designed with a large flow area. This minimizes pressure drop during free reverse flow, significantly reducing system heat generation.

Application Areas

• Industrial Machine Tools: Regulating feed speeds for hydraulic slides and tool carriers.

• Construction Machinery: Flow limitation in pilot circuits for excavators and drilling rigs.

• Injection & Metallurgy: Controlling the smoothness of injection cylinders or rotary actuators.

Expert Maintenance Tips

• Locking Mechanism: Once the desired flow is set, always tighten the lateral set screw to prevent the adjustment from drifting due to system vibration.

• Fluid Cleanliness: To prevent “electrochemical erosion” at the throttling edge and ensure smooth movement, maintain system oil cleanliness at NAS Class 9 or better.

• Installation Orientation: When installing in-line DV/DRV models, verify the flow direction (indicated by the arrow on the DRV body) to ensure the check valve function operates as intended.