Vickers Eaton RV3 & RV5 Series Cartridge Relief Valve | RV3-10-S-0-18 RV3-10-S-0-36 RV5-10

The Vickers Eaton RV Series premium screw-in cartridge hydraulic pressure relief valves manufactured by Chengyuan Hydraulic are high-performance fluid power regulation components precision-engineered to perfectly match the design architecture of Vickers (Eaton Fluid Power System / Danfoss framework). This reliable aftermarket alternative matrix fully covers critical, high-frequency valve elements operating across heavy agricultural harvesters, mobile municipal machinery, and versatile multi-way directional control valve manifolds, featuring direct-acting differential poppet relief profiles (RV1, RV3, RV6, RV8, RV3-10-S-0-18, RV3-10-S-0-36, RV3A-10-C-0-18/15), as well as low-hysteresis pilot-operated spool variants (RV5, RV5-10).

Functioning as the essential pressure-limiting defense and over-pressure shield inside manifold blocks, cross-port motor protection circuits, and industrial power packs, a cartridge relief valve’s opening response time, pressure override characteristics, and tight seat resealing directly dictate total actuator stability and thermal oil temperature controls. Chengyuan ensures 100% original-place drop-in interchangeability for all cartridges regarding standard two-way C-10-2 cavities, unified 0.875″-14 UNF thread configurations, matching poppet seating tapers, and anti-extrusion back-up ring arrangements. Every single relief valve undergoes 100% full-flow cracking pressure and thermal leakage testing on computerized diagnostics rigs, guaranteeing pressure control and fatigue life up to 35.0 MPa.

Technical Specifications 

• Compatible Brand Standard: Vickers / Eaton / Danfoss (Screw-In Cartridge Valve Standard)

• Target Replacement Configurations: RV1, RV3, RV5, RV6, RV8, RV3-10-S-0-18, RV3A-10-C-0-18/15, RV3-10-S-0-36

• Valve Common Porting Nominal Cavity Standard: Size 10 specification, compatible with the standard C-10-2 2-way cavity

• Hydraulic Control Operation Classifications:

  • RV1 / RV3 / RV6 / RV8 Sub-series: Direct-acting, differential area poppet type. Offers ultra-fast response times and robust resistance against heavy tank line backpressures.

  • RV5 / RV5-10 Sub-series: Pilot-operated spool type. Provides flat pressure-versus-flow adjustment curves, ideal for steady continuous system unloading.

• Maximum Continuous Flow Capacity:

  • RV3 Direct-Acting Series: 76 L/min (20 USgpm)

  • RV5 Pilot-Operated Series: 114 L/min (30 USgpm)

• Maximum Application Pressure Limit:

  • RV3 Configurations: 25.0 MPa (250 bar / 3,600 psi)

  • RV5 Heavy Duty Configurations: 35.0 MPa (350 bar / 5,000 psi)

• Cracking Pressure Range Code Breakdown:

  • Code ’18’ Models (e.g., RV3-10-S-0-18): Adjustable range from 2.1 to 12.4 MPa (300 to 1,800 psi); factory pre-set at mid-range.

  • Code ’36’ Models (e.g., RV3-10-S-0-36): Adjustable range from 4.1 to 25.0 MPa (600 to 3,600 psi).

• Adjustment Mechanical Configurations:

  • S Identifier: External screw adjustment with integrated lock-nut lock configuration

  • C Identifier: Tamper-resistant protective metallic sealing cap

• Sealing Media Selections: Equipped with high-resilience Buna-N O-rings paired with Teflon anti-extrusion back-up rings. Optional high-temperature Viton (Fluoroelastomer) seal arrangements are available for synthetic fluid environments.

• Total Cartridge Component Weight: Approx. 0.22 kg (0.48 lbs)

Key Technical Advantages:

• Vacuum-Hardened Tool Steel Poppet Elements Resisting High-Frequency Cycles: The primary poppet core and internal seating guides are machined from premium tool alloy steel (such as Cr12MoV or GCr15), hardened via vacuum cycles to reach HRC 60-63. Even after sustaining more than 1 million cyclic pressure shocks, the metal-to-metal seating line remains perfectly smooth, preventing internal cross-port degradation and keeping internal seat bypass leakage extremely low.

• CFD Optimized Internal Flow Path Suppressing Acoustic Resonances: The internal flow chamber contours are reshaped based on advanced computational fluid dynamics (CFD) modeling. When the poppet acts to dump oil under pressure spikes, fluid turbulence is minimized. This stable flow transition eliminates traditional hydraulic chattering and system line vibration, keeping average operational noise below 65 dB(A).

• Shot-Peened Linear-Rate Control Springs Mimicking Zero Hysteresis: The regulating spring inside the core is coiled from imported premium Silicon-Chromium alloy wire (SiCr) and conditioned via targeted shot-peening to eliminate stress relaxation. With a linear stiffness deviation of $\le 1\%$, the pressure override margin between cracking pressure and full-flow pressure is tightly limited, providing smooth adjustments and near-zero hysteresis.

• Anti-Extrusion Back-Up Support Seals with Infinite Backpressure Durability: The cartridge is fitted with high-durometer O-rings backed by anti-shear reinforcing rings within the C-10-2 sealing zone. This arrangement safely absorbs backpressure fluid shear stresses up to 25 MPa without tearing or extruding the elastomers, preventing external leakage out of the valve hex head.

Application Areas:

• Agricultural Harvesters & Vocational Municipal Machinery: Functioning as the primary system safety relief and lift cylinder lock inside multi-way directional control blocks on large combine harvesters or refuse collection vehicles.

• Hydrostatic Motor Overload & Cross-Port Shock Mitigation: Bolted into crossover dual-relief valve packages on truck crane slewing rings or crawler closed-loop travel drives to clip peak pressure spikes.

• Industrial Integrated Hydraulic Manifolds & Power Packs: Regulating pressure within auxiliary servo loops on plastic injection molding clamps and material handling holding fixtures.

Expert Maintenance Tips:

• Perform Strict Cavity Inspection and Solvent De-burring Prior to Valve Insertion: Because screw-in cartridge valves use rubber O-rings to isolate high-pressure internal zones, any metal burs, threading slag, or sharp debris left inside the block cavity will slice or nick the seals as the valve is screwed home. This compromises the sealing boundary and leads to internal pressure cross-port bleeding right from startup.

• Utilize a Calibrated Torque Wrench to Meet Exact Newton-Meter Targets: Cartridge valve sleeves have thin walls and are sensitive to distortion from over-tightening. When threading the valve into a manifold block, you must tighten it exactly to the engineering torque specification: 47-54 Nm (35-40 ft. lbs) for aluminum manifolds, and 68-75 Nm (50-55 ft. lbs) for steel blocks. Never use an adjustable wrench to crank down blindly on the hex head, as over-tightening warps the internal bore, causing the poppet to bind up or fail to regulate pressure altogether.

• Enforce Ultra-Clean Fluid Filtration Control to Prevent Orifice Blockage: This is critical for RV5 series pilot-operated spool relief valves, which feature tiny internal pilot damping orifices inside the spool head. System fluid cleanliness must be held strictly to ISO 4406 18/16/13 or cleaner. If oxidized carbon soot or fine ferrous particulates plug the pilot hole, the valve can stick open (causing a total loss of system pressure) or jam shut (leading to an over-pressure condition that risks bursting hoses or damaging the pump).