The Swing Check Valve Consists Of A Valve Body, Seat, And Disc Linked To The Hinge.
Upon encountering a specified flow rate, the disc rotates to a horizontal position, enabling forward flow.
The Swing Check Valve Consists Of A Valve Body, Seat, And Disc Linked To The Hinge.
Upon encountering a specified flow rate, the disc rotates to a horizontal position, enabling forward flow. it returns to the valve seat when the flow stops to prevent backflow.
Swing check valves are widely used for backflow prevention in pipelines, offering automatic operation, durability, and low maintenance. They are essential in industries such as oil & gas, water treatment, and power generation.
The valve body contains a hinged disc that swings away from the valve seat to allow forward flow, and returns automatically when the flow stops to prevent backflow. The disc moves freely without guides, allowing full, unobstructed flow with minimal turbulence and low pressure drop.
API 6D and API 594 swing check valves are vital for ensuring safe and efficient pipeline operations. They provide cost-effective, automatic operation and are trusted in critical applications across multiple industries.
The API 6D API 594 Swing Check Valve is a high-performance non-return valve engineered for robust backflow prevention in demanding industrial applications, offering exceptional corrosion resistance and durability for pipeline protection. Compliant with API 6D for pipeline valves and API 594 for check valves, this swing check valve features a hinged disc that swings freely to allow forward flow while automatically closing to prevent reverse flow, safeguarding pumps, compressors, and piping systems from damage. Constructed from materials like ASTM A216 WCB carbon steel, ASTM A351 CF8M stainless steel, or alloy steels, with optional overlays such as Stellite or Inconel, it excels in pipeline backflow protection for oil, gas, water, and chemical systems.
Manufactured through casting or forging processes, the API 6D check valve undergoes precise machining and heat treatment to achieve optimal mechanical properties, ensuring compliance with ASME B16.34 for pressure-temperature ratings up to Class 2500 (PN420) and temperatures from -46°C to 425°C. The swing mechanism, supported by a robust hinge pin, provides low-pressure drop and quick closure, with optional spring assistance for low-flow conditions to enhance sealing integrity. Available in sizes from 2" to 60" (DN50 to DN1500) with flanged, butt-weld, or hub end connections per ASME B16.5 or B16.25, it integrates seamlessly into existing pipelines. The valve's corrosion resistant swing valve design resists pitting, erosion, and chemical attack in harsh environments like offshore platforms or refineries.
Rigorous testing, including hydrostatic shell tests (1.5x rated pressure), seat leakage tests per API 598, and optional nondestructive examinations (RT, UT, MT, PT), guarantees zero-leakage performance and structural integrity. With a minimum tensile strength of 485 MPa and yield strength of 250 MPa for WCB material, the valve withstands high-pressure surges and thermal cycling, making it ideal for industrial check valve applications in power plants and petrochemical facilities. Surface treatments such as epoxy coating or 3LPE enhance corrosion resistance, protecting against external factors like soil corrosion in buried pipelines or marine biofouling in seawater systems. The disc's full bore design minimizes flow restriction, optimizing efficiency in high-throughput operations.
In comparison to lift or dual-plate check valves, the API 594 non-return valve offers superior slam resistance and easier maintenance, with a renewable seat and disc for extended service life in abrasive media like slurries or gases with particulates. Its ability to handle viscous fluids and high velocities without chattering makes it a preferred choice for pipeline backflow protection in natural gas transmission or crude oil transport. Custom options, including soft seats for bubble-tight sealing in low-pressure systems or extended bonnets for cryogenic service, ensure adaptability to diverse requirements. The valve's compliance with NACE MR0175 for sour service further broadens its use in hydrogen sulfide-rich environments.
Addressing key challenges such as backflow-induced contamination, equipment failure, and pipeline corrosion, the API 6D API 594 Swing Check Valve provides a cost-effective, low-maintenance solution for engineers seeking reliable industrial flow control. Its robust design and material options make it indispensable for protecting boiler pipelines, preventing erosion in high-velocity flows, and ensuring safety in critical infrastructure. Whether in upstream oil extraction or downstream refining, this corrosion resistant swing valve delivers unmatched performance, longevity, and compliance for global industrial operations.
Engineered for reliable backflow prevention with API-compliant design and corrosion resistance.
Check valves are essential components that ensure safe and efficient operation of fluid systems by controlling flow direction and preventing backflow.
Permits fluid flow in one direction and automatically closes to prevent backflow in the opposite direction.
Uses hinged or spring-loaded flaps, discs, or pistons that open with forward flow and close with backflow.
Includes swing, lift, ball, and diaphragm check valves, each suited for different applications and conditions.
Widely used in water, wastewater, oil & gas, HVAC, and many other industrial applications.
Helps avoid sudden pressure surges caused when fluid flow is abruptly stopped.
Simple and reliable design ensures long-term efficiency with minimal upkeep.
Check valves are one-way valves that allow fluid to flow in a single direction and automatically prevent backflow. They are widely used in pipelines to protect pumps, piping, and other equipment. Backflow preventers apply additional pressure to ensure water flows only one way, providing extra protection for drinking water systems.
Allows fluid to flow in one direction and automatically prevents backflow.
Protects pumps, piping, and other equipment.
Check Valve: Simple, hinged or spring-loaded disc.
Backflow Preventer: Uses pressure and fail-safes to protect drinking
water.
Hinged disc swings open to allow forward flow and closes to prevent backflow.
Low turbulence and low pressure drop.
Piston or ball lifts from the seat to allow flow.
Suitable for high-pressure and high-velocity systems; can be installed horizontally or
vertically.
Ball Check, Butterfly Check, and Tilting-Disk Check valves.
Each design is optimized for specific applications and conditions.
- Unidirectional flow control
- Low maintenance
- Prevents water hammer
- Wide range of sizes & materials
- Versatile in water, oil, gas, and HVAC systems
| Feature | Check Valve | Backflow Preventer |
|---|---|---|
| Primary Function | Allows flow in one direction; prevents reverse flow automatically | Prevents contamination of drinking water; ensures flow only in one direction using pressure & fail-safes |
| Mechanical Design | Hinged disc, flap, piston, or ball opens with flow and closes with backflow | Multiple valves, check mechanisms, or air gaps to enforce one-way flow |
| Application | Pipelines, pumps, HVAC, water & wastewater, oil & gas | Potable water supply, irrigation, hospitals, schools, commercial buildings |
| Pressure Handling | Medium to high pressure; depends on valve type | High reliability; designed for pressurized systems to prevent contamination |
| Maintenance | Low; simple design, few moving parts | Moderate; more components, periodic inspection recommended |
| Reliability | Good for general use; may fail under extreme conditions | Highly reliable; multiple fail-safes for drinking water protection |
| Organization | Standard | Description |
|---|---|---|
| ANSI | American National Standards Institute | General industrial standards |
| API | American Petroleum Institute | Standards for oil and gas industry |
| ASME | American Society of Mechanical Engineers | Boiler and pressure vessel codes |
| BS | British Standards | UK national standards |
| GB, JB, HG | China Valve Standards | Chinese national and industry standards |
Upstream, midstream, and downstream operations, including drilling, refining, and transportation.
Handling corrosive and hazardous chemicals in various chemical plants.
Steam, water, and fuel systems in thermal, nuclear, and hydroelectric plants.
Municipal water supply, wastewater treatment, and industrial water management.
Heating, ventilation, and air conditioning systems in commercial and industrial buildings.
Sterile and hygienic applications, precise flow control in sensitive industries.
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