Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of Atos Check Valve in China. We warmly welcome you to wholesale bulk Atos Check Valve for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
▔▔Atos Check Valves (including direct-operated inline check valves, pilot-operated check valves, and modular sandwich check valves such as the standard ADR, ADRL, and DRL series) are high-performance non-return hydraulic components engineered for demanding fluid power systems. Designed to allow free flow in one direction while providing leak-free, zero-slip closure in the reverse direction, these valves are critical for load holding, system pressure protection, and pump isolation.
Key Advantages
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Zero-Leakage Sealing: Precision-ground poppets and hardened metal-to-metal seating ensure tight shut-off under extreme pressure.
Low Pressure Drop: Optimized fluid dynamic design minimizes internal turbulence and flow resistance, reducing power loss and heating.
High-Dynamic Response: Extremely fast response time ensures instant reaction to reverse flow, protecting upstream components from hydraulic shock and pressure spikes.
Modular Versatility: Available in subplate mounting, inline threaded connections, and ISO/Cetop sandwich plate configurations for flexible manifold integration.
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Technical Specifications
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| Parameter | Specification / Value | Unit | Notes / Conditions |
| Max Operating Pressure | Up to 350 / 420 | bar | Port & model dependent |
| Max Nominal Flow Rate | 10 to 600 | L/min | Size 06 (NG6) to Size 32 (NG32) |
| Cracking Pressure | 0.5, 1.5, 3.0, 5.0 | bar | Standard spring options |
| Fluid Temperature Range | -20 to +80 | °C | NBR Seals (up to +120°C with FKM/Viton) |
| Fluid Viscosity Range | 15 to 100 | mm²/s | Recommended range (10 to 500 allowed) |
| Required Fluid Cleanliness | ISO 4406 Class 20/18/15 | - | NAS 1638 Class 9 achieved via filtering |
| Internal Leakage | 0 to 0.25 (Zero-leakage) | cm³/min | At max pressure |
| Response Time | 10 to 35 | ms | Depending on valve size and pilot pressure |
Configuration Options
▔▔Valve Structures: Direct-acting poppet type, pilot-operated poppet type (with or without internal drain), single or dual check functions in sandwich plates.
Control & Pilot Options:
Direct flow cracking via internal spring preload.
External hydraulic pilot control for unseating the poppet in pilot-operated variants (pilot ratios range typically from 1:3 to 1:6).
Mounting Interfaces:
Threaded Inline Ports: BSPP (G), NPT, or SAE ports.
Subplate / Manifold Mounting: ISO 4401 (CETOP 03, 05, 07, 08).
Modular Sandwich Plates: CETOP 3 (NG6), CETOP 5 (NG10), CETOP 7 (NG16), CETOP 8 (NG25).
Seal Configurations:
Standard NBR (Nitrile) seals for mineral-based hydraulic oils.
FKM (Viton) seals for synthetic fluids, high-temperature applications, or fire-resistant fluids (HFD-R).
Key Materials and Components
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- Valve Body: High-strength ductile iron (cast iron) or premium carbon steel housing, phosphatized or zinc-plated for enhanced corrosion resistance under harsh industrial environments.
- Poppet & Internal Valve Spool: Hardened chromium alloy steel (HRC 58-62), micro-finished and precision ground to withstand high-velocity fluid abrasion and high impact cycles.
- Springs: High-fatigue resistant stainless steel or alloy steel, designed for millions of operational cycles without cracking pressure drift.
- Sealing Elements: High-grade elastomer seals combined with PTFE anti-extrusion back-up rings to prevent seal nibbling under high operating pressures.
Packaging and Transport Protection
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- Individual Industrial Packaging: Each valve is thoroughly cleaned, oil-flushed, sealed with anti-corrosion protective oil, and capped at all ports using plastic plugs.
- Moisture & Rust Prevention: Hermetically sealed in heavy-duty VCI (Vapor Corrosion Inhibitor) polybags containing desiccant packs to prevent oxidation during maritime export transport.
- Shock Absorption: Wrapped in custom-cut high-density EPE foam cradles and housed in reinforced corrugated cardboard inner cartons.
- Bulk Packaging: Multi-unit orders are packed into standard ISPM-15 compliant export wooden cases/crates, strapped with heavy-duty polyester banding and stretch wrapped for transit stability.
Applications
▔▔- Injection Molding Machines: Used as load-holding and clamping cylinder lock valves to ensure zero pressure drop during the high-pressure holding phase.
- Hydraulic Presses & Stamping Equipment: Integrated into pre-fill circuits and safety support systems to prevent heavy slide gravity drop when static.
- Industrial Winches & Cranes: Applied as counter-balance and anti-drift safety check valves to securely lock hydraulic motors and hoist cylinders under load.
- Hydraulic Power Units (HPUs): Installed on main pump outlets to isolate the pump from system backpressure shock during shutdown and pump switching.
- Machine Tools & CNC Equipment: Used in work-piece clamping fixtures to maintain steady hydraulic force even in the event of primary power or pump failure.
Related Models
▔▔| Model Code | Mounting Interface / Type | Nominal Size | Max Pressure (bar) | Max Flow (L/min) |
| ADR-06 | Threaded Inline Check Valve | G 1/4" - G 3/8" (NG06) | 350 | 40 |
| ADR-10 | Threaded Inline Check Valve | G 1/2" - G 3/4" (NG10) | 350 | 80 |
| ADR-20 | Threaded Inline Check Valve | G 1" - G 1 1/4" (NG20) | 350 | 160 |
| ADRL-10 | Pilot-Operated Inline Check Valve | G 1/2" (NG10) | 315 | 60 |
| ADRL-20 | Pilot-Operated Inline Check Valve | G 1" (NG20) | 315 | 120 |
| HR-06 | Modular Sandwich Check Valve (ISO 4401) | Size 06 / CETOP 03 | 350 | 60 |
| KR-012 | Modular Pilot Check Valve (ISO 4401) | Size 10 / CETOP 05 | 315 | 120 |
| JAR-16 | Subplate Mounted Check Valve | Size 16 / CETOP 07 | 350 | 300 |
FAQ
▔▔Q1: How do I select the correct spring cracking pressure for my circuit?
A1: Standard cracking pressures are 0.5 bar, 1.5 bar, 3 bar, and 5 bar. For simple bypass or suction anti-cavitation applications, lower cracking pressures (0.5 to 1.5 bar) are recommended. For return line backpressure or pilot pressure generation, higher settings (3 to 5 bar) should be specified.
Q2: What fluid cleanliness level is required to avoid internal leakage?
A2: A cleanliness level of ISO 4406 Class 20/18/15 (or NAS 1638 Class 9) is required. Particulate contamination is the primary cause of seat damage and reverse leakage in poppet-style check valves.
Q3: Can Atos check valves be interchanged with other CETOP/ISO standard brands?A3: Yes. Modular sandwich check valves (such as HR, KR series) follow standard ISO 4401 interfaces (CETOP 03, 05, 07, 08) and are direct drop-in replacements for Rexroth, Eaton Vickers, and Parker equivalents.
Contact Us
▔▔Get in touch with us and we will get in touch with you quickly to give you more personalized information.
Product Overview
▔▔The Atos HR-012 is a high-performance, direct-operated modular check valve designed for standard hydraulic circuit mounting conforming to ISO 4401 / CETOP 03 (Size 06) standards. Engineered for maximum reliability, low pressure drop, and leak-free operation, the HR-012 allows free fluid flow in one direction while strictly preventing reverse flow.
Key Advantages
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Leak-Free Sealing: Features precision-ground poppet designs and high-grade sealing elements to ensure zero internal leakage in the closed direction.
Modular Stackable Design: Standard CETOP 03 / ISO 4401-03 interface enables easy sandwich mounting beneath directional valves, minimizing piping and compacting manifold design.
High Working Pressure & Flow: Capable of handling operating pressures up to 315 bar (4560 psi) and max flow rates up to 60 L/min (15.8 gpm).
Robust & Corrosion-Resistant Build: Manufactured with high-strength alloy body and treated steel internal components for long service life under heavy duty applications.
Flexible Cracking Pressures: Available with multiple spring cracking pressure options (e.g., 0.5 bar, 2 bar, 4 bar) to suit varied system load requirements.
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Technical Specifications
▔▔| Parameter | Specification / Value |
| Model Code | HR-012 (or HR-012/* options) |
| Manufacturer | Atos Hydraulic |
| Valve Type | Modular Non-Return / Check Valve |
| Mounting Interface | ISO 4401-03 / CETOP 03 / NFPA D03 (Size 06) |
| Max Operating Pressure | 315 bar (4560 psi) |
| Max Flow Rate | 60 L/min (15.8 gpm) |
| Standard Cracking Pressure | 0.5 bar (7.25 psi) [Optional: 2 bar, 4 bar, 8 bar] |
| Fluid Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Ambient Temperature Range | -20°C to +70°C (-4°F to +158°F) |
| Recommended Viscosity Range | 15 to 100 mm²/s (cSt) |
| Fluid Cleanliness Standard | ISO 4406 class 20/18/15 (NAS 1638 class 9) |
| Seal Options | NBR (Standard), FKM/Viton (High temp/phosphate ester) |
| Weight | Approx. 1.2 kg (2.64 lbs) |
Applications
▔▔| Application Sector | Typical Machine / Equipment | Functional Role |
| Industrial Hydraulics | Plastic Injection Molding Machines & Metal Stamping Presses | Prevents reverse flow, maintains line pressure, and protects upstream pumps from pressure spikes. |
| Material Handling | Hydraulic Lifts, Elevators, & Winch Controls | Works as a safety non-return element to retain hydraulic pressure and prevent unintended load drops. |
| Machine Tools | CNC Milling, Lathes, & Hydraulic Clamping Systems | Maintains constant clamping pressure and ensures system directional stability during machining cycles. |
| Mobile Machinery | Excavators, Loaders, & Agricultural Equipment | Provides inline anti-cavitation protection and prevents reverse backflow under heavy dynamic movement. |
| Power Generation | Turbine Governors & Hydraulic Power Units (HPUs) | Ensures continuous unidirectional oil movement through critical filtration and cooling loops. |
Related Models
▔▔| Model Code | Mounting Size | Controlled Line(s) | Function / Feature |
| HR-011 | CETOP 03 (Size 06) | Line A | Single direct check valve on line A |
| HR-012 | CETOP 03 (Size 06) | Line A & B / Line P | Modular check valve (Standard line configuration) |
| HR-013 | CETOP 03 (Size 06) | Line B | Single direct check valve on line B |
| HR-014 | CETOP 03 (Size 06) | Line T | Check valve integrated into Return Line T |
| KR-012 | CETOP 05 (Size 10) | Lines A & B | Heavy-duty modular check valve for higher flow (up to 120 L/min) |
| JPR-012 | CETOP 07 (Size 16) | Lines A & B | High-flow modular check valve (up to 300 L/min) |
| HRA-012 | CETOP 03 (Size 06) | Lines A & B | Pilot-operated check valve for load holding |
FAQ
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Q1: What is the primary function of the Atos HR-012 check valve?
A: The main function of the Atos HR-012 is to allow fluid flow in one specified direction with low hydraulic resistance while completely blocking flow in the opposite direction. It prevents reverse fluid flow, maintains system pressure, and protects sensitive equipment from shock pressure backflows.
Q2: How does the HR-012 differ from a pilot-operated check valve like the HRA series?
A: The HR-012 is a direct-operated non-return valve that opens purely based on fluid pressure exceeding the spring cracking pressure. In contrast, pilot-operated check valves (such as the Atos HRA series) use an external or internal pilot pressure signal to force the valve open in the reverse direction when required.
Contact Us
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