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API Standard Swing Check Valve – Overview An API standard swing check valve is a non-return valve designed in accordance with the American Petroleum Institute’s (API) specifications, ensuring consistent quality, performance, and safety across a range of industrial applications. This valve type automatically prevents backflow by utilizing a swinging disc mechanism that opens under forward flow and closes when flow reverses, protecting pumps, compressors, and piping systems. Key Design Features API Compliance Manufactured to API 6D or API 594 standards for precise dimensional accuracy, performance reliability, and compatibility with global pipeline systems. Swing Disc Mechanism The hinged disc swings away from the seat during forward flow and returns to the closed position under reverse flow or gravity. Material Options Available in carbon steel, stainless steel, alloy steel, or duplex materials to suit various pressure, temperature, and corrosive environments. End Connections Flanged, butt weld, and socket weld ends for seamless integration into pipeline networks. Pressure and Temperature ...
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Axial Flow Check Valve – Overview An axial flow check valve is a high-performance non-return valve engineered to allow flow in one direction while preventing reverse flow through a streamlined axial flow path. Unlike swing or lift check valves, this design utilizes a spring-loaded disc or piston moving along the pipeline axis, minimizing turbulence and ensuring quick closure during flow reversal. This axial motion significantly reduces water hammer and pressure surges, making it a preferred choice in critical, high-velocity applications. Key Design Characteristics Axial Flow Principle The valve disc travels in line with the pipeline axis, guided precisely to maintain a uniform flow profile and minimize head loss. Spring-Assisted Closure A calibrated spring ensures rapid sealing when forward flow decreases, reducing the risk of backflow-induced damage. Streamlined Flow Path Internal geometry is designed for low turbulence and optimal energy efficiency in high-capacity systems. Material Flexibility Available in carbon steel, stainless steel, duplex stainless steel, and high-alloy materials to handle diverse media ...
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Forged Steel Check Valve – Overview The forged steel check valve is a compact, high-strength non-return valve designed to prevent reverse flow in pipelines. Built from forged steel for exceptional pressure and temperature resistance, it operates automatically—opening under forward flow and closing to prevent backflow—protecting pumps, compressors, and other equipment. Key Design Features Forged Steel Body Available in ASTM A105, A182 F11/F22, F304, F316, or other alloy steels, ensuring superior mechanical strength and corrosion resistance. End Connections Flanged Ends – Compliant with ASME B16.5 standards for secure bolted connections. Socket Welding (SW) or Threaded (NPT/BSP) – For compact installations and high-pressure service. Pressure Class Typically offered in ASME Class 800 / 1500 / 2500, suitable for demanding service conditions. Sealing Options Metal-to-metal hard-faced seat or soft-seated designs depending on media and operating conditions. Flow Direction Control Clearly marked with flow arrows to en ...
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Lug Wafer Double Disc Check Valve – Overview The lug wafer double disc check valve is a compact, lightweight backflow prevention device designed for installation between flanges in pipelines. Featuring a dual-disc, spring-loaded design, it ensures quick closure and minimal water hammer while maintaining a low-pressure drop. The lug-style body allows for easy alignment during installation and can be mounted in both horizontal and vertical orientations. Key Design Features Dual Disc Configuration Two independent half-discs mounted on a central hinge pin for rapid closure, reducing reverse flow impact. Spring-Assisted Closure Ensures fast shutoff, minimizing water hammer and providing reliable sealing even in low-flow conditions. Lug Wafer Body Equipped with threaded lugs for precise flange alignment and the option for end-of-line service in certain configurations. Body & Disc Materials Body: Cast iron, ductile iron, carbon steel, stainless steel Discs: Stainless steel, duplex steel, or other alloys for corrosion resistance ...
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Pressure Self-Sealing Check Valve – Overview The pressure self-sealing check valve is designed to automatically prevent reverse flow in high-pressure pipelines by utilizing the system’s own pressure to achieve a secure seal. This valve type is particularly suited for applications where traditional bolted bonnet designs may be less efficient, as the pressure-assisted sealing structure reduces the risk of leakage under extreme operating conditions. Key Design Features Self-Sealing Bonnet Design Uses the internal line pressure to create a tight seal at the bonnet joint, eliminating the need for high numbers of bolting and enhancing sealing reliability under high pressure. Robust Body Construction Materials: Carbon steel, alloy steel, or stainless steel for various temperature and pressure requirements. Pressure Classes: Commonly available in Class 600 to Class 2500. Disc and Seat Arrangement Swing or tilting disc options depending on flow conditions, with hard-faced seating surfaces to withstand erosive service. Standards Compliance Manufactu ...
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Wafer Double Flap Swing Check Valve – Overview The wafer double flap swing check valve is designed for reliable backflow prevention in medium and large diameter pipelines while maintaining a compact and lightweight structure. Its double-door disc design allows for smooth, low-resistance opening during forward flow and rapid closure when reverse flow is detected, minimizing water hammer and pressure surges. The wafer body construction makes it suitable for installations with limited space between flanges. Key Design Features Wafer-Type Body Slim profile for easy installation between standard pipeline flanges, reducing weight and material cost compared to full-bodied check valves. Dual Flap Disc Assembly Each flap operates independently to reduce the force required for opening. Torsion springs ensure quick closing to prevent reverse flow. Low Pressure Drop Streamlined internal passage minimizes turbulence and energy loss. Materials Body: Carbon steel, stainless steel, or ductile iron. ...
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