CV-12-N-05 LCV-25-E-20 Cartridge Check Valve | Hydraulic One-Way Valve

The CV and LCV Series threaded cartridge check valves (hydraulic one-way valves) from Chengyuan Hydraulic are high-quality fluid control components fully compatible with mainstream industrial standards. Designed to allow free flow in one direction and provide absolute shut-off in the reverse direction, these valves are critical for secure pressure holding and backflow prevention. For core configurations like CV-12-N-05 (Size 12, Buna-N seals, 0.5 bar cracking pressure) and the modular logic-style check valve LCV-25-E-20-10, we utilize a precision-lapped alloy steel poppet design. Every single valve undergoes 100% simulated high-pressure reverse leakage and high-frequency cycling testing before delivery, guaranteeing zero internal leakage at 350 Bar and ensuring 100% original-place interchangeability.

Technical Specifications :

• Series Family: CV Series (Standard Threaded Check Valve) / LCV Series (Cartridge Logic Check Valve)

• Frame Sizes: CV-08 (Size 8) / CV-10 / CV-12 (Size 12) / CV-16 / LCV-25 (High-Flow Size 25)

• Max Operating Pressure: 350 bar (35 MPa)

• Rated Flow Capacity: Ranges from 30 L/min (Size 08) up to 300 L/min (LCV-25)

• Elastomer Options: N (Buna-N, rated for $-30°C$ to $+100°C$) / V (Viton/FKM, rated for $-20°C$ to $+120°C$)

• Cracking Pressure Codes:

  • 05: 0.5 bar (Ultra-low for return line makeup or low-pressure bypass)

  • 20: 2.0 bar (Standard system operation)

  • 50: 5.0 bar (Specialized for creating loop backpressure)

  • 75: 7.5 bar (High backpressure setting)

• Internal Sealing: Hardened metal-to-metal poppet and seat geometric sealing

Key Technical Advantages:

• Bubble-Tight Metal-to-Metal Sealing: The poppet and seat are forged from premium alloy steel, vacuum-hardened to above HRC 60, and finished with high-precision spherical lapping. Even under continuous reverse holding at 350 Bar, it achieves zero-slip, bubble-tight sealing to prevent actuator drift.

• Low-Resistance Flow Path: The internal chamber and flow profile are optimized using Computational Fluid Dynamics (CFD) to maximize flow area. In the free-flow direction, turbulence and pressure drop ($\Delta P$) are minimized, significantly reducing hydraulic heat generation under continuous high-flow cycles.

• Fatigue-Resistant Spring Engineering: The internal return spring is wound from premium imported piano wire and treated via a specialized tempering process, providing a fatigue life exceeding 10 million cycles. It guarantees consistent spring rate and zero cracking under high-frequency pressure shocks.

• Micro-Tolerance Cartridge Interfacing: Thread profiles and shoulder distances are maintained within micron-level tolerances. Whether it is the CV-12 or LCV-25 specification, the valves seamlessly thread into any standard hydraulic manifold cavity, allowing rapid OEM replacement without reworking block cavities.

Application Areas:

• Hydraulic Pump Protection: Placed directly at the pump outlet to prevent high-pressure line backflow from destroying the pump elements.

• Accumulator Isolation Circuits: Ensuring that high-pressure fluid stored inside the accumulator does not bleed backward into the primary reservoir line.

• Bypass Backpressure Generation: Utilizing the 50 (5 bar) or 75 (7.5 bar) options to maintain positive pilot pressure in returns.

• Custom Manifold Assemblies: Embedded directly within mobile machinery multi-way valve blocks as a dedicated thermal or directional drift lock.

Expert Maintenance Tips:

• Strict Installation Torque Management: Always use a calibrated torque wrench when threading valves like the CV-12 into a manifold block. Over-torquing can permanently distort the external O-rings and Teflon backup rings, causing external weeping or damaged body threads.

• Zero-Pressure Disassembly Directive: Before removing or servicing any threaded cartridge valve, the entire hydraulic circuit must be completely depressurized. Ensure all accumulator stored pressure is vented to avoid high-pressure oil injection hazards.

• Fluid Chemical Compatibility Notice: For specialized industrial systems running phosphate ester fire-resistant hydraulic fluids, ensure you select the “V” (Viton/FKM) seal variant, as standard “N” (Buna-N) seals will suffer from severe chemical swelling and degradation.