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Founded in 2010 and headquartered in Anfeng Industrial Zone, Yongjia, Zhejiang, SUNAY has three manufacturing subsidiaries with a registered capital of 10.8 million RMB. Our products—including API 6D pipeline ball valves, gate, globe, check, plug valves, and API 609 butterfly valves- offer complete fluid control solutions for petrochemical, LNG, nuclear, marine, aerospace, and other industries.
Comprehensive Product Range
We offer 6 major valve types with 1,000+ specifications, including patented high-temperature, high-pressure, and particle-resistant valves.
Advanced Technology
Equipped with CAD design, 3D simulation, and professional testing platforms for continuous product optimization.
Strict Quality Management
International-standard production, ERP and SAP systems, and precision casting ensure reliable, standardized manufacturing.
Certified and Trusted
Holds ISO9001, ISO14001, ISO45001, CE, and AAA credit certifications; supplier to major national and international enterprises.
Check valves allow fluid to flow in one direction while preventing backflow, protecting pumps, pipelines, and critical equipment. They are widely used in water treatment, chemical, oil & gas, power generation, and HVAC.
One-Way Flow Protection
The valve automatically closes when flow reverses, preventing backflow and protecting pumps, compressors, and pipelines.
Durable Sealing
The valve disc presses against the seat to create a tight seal, ensuring leak-free operation under normal pressure conditions.
Low Maintenance Cost
Simple design with few moving parts reduces wear and maintenance frequency.
Low Pressure Drop
Optimized flow path and streamlined disc design minimize resistance.
Swing Check Valve
Uses a swinging disc to allow forward flow and prevent backflow for water, wastewater, and general pipelines.
Lift Check Valve
A linear-moving disc valve that provides tight sealing for high-pressure pipelines.
Ball Check Valve
Uses a floating ball to stop backflow; compact design suitable for small-diameter or chemical pipelines.
Dual Disc Check Valve
Two discs in a compact design; saves space and closes quickly in industrial pipelines.
Nozzle Check Valve
High-performance anti-slam valve; ideal for high-flow, high-pressure, or severe service applications.
Pressure Seat Check Valve
Swing-type valve with pressure-assisted seat protects pumps and compressors in high-pressure systems.
Spring Check Valve
Spring-assisted closure reduces noise and prevents water hammer; widely used in municipal, HVAC, and pump applications.
Water & Wastewater Treatment – Prevents backflow in pumps and piping systems in municipal and industrial water treatment plants.
Power Generation – Used in cooling water, boiler, and steam systems to protect pumps and turbines from reverse flow.
Oil & Gas Industry – Ensures safe flow direction in pipelines, compressors, and refineries.
Chemical & Petrochemical – Handles corrosive or high-temperature fluids, maintaining process safety in chemical plants.
HVAC Systems – Maintains proper fluid flow in heating, ventilation, and air conditioning pipelines.
Marine & Shipbuilding – Protects pumps and piping in ballast, cooling, and fuel systems onboard ships.
Industrial Manufacturing – Used in process lines, cooling circuits, and hydraulic systems to prevent backflow and ensure smooth operation.
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Option |
Detail |
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Valve Materials |
Stainless steel, Bronze, Brass, PVC, PP, PVDF |
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Sizes & Diameters |
Standard and non-standard pipe sizes |
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Pressure Ratings |
Low to high-pressure applications |
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Special Functions |
Silent/ Spring-assisted, Anti-water hammer, High-temp, Corrosive media |
As one of the most professional check valve manufacturers and suppliers in China, we offer a wide range of valves with superior quality. Please feel free to wholesale high quality check valve at competitive price from our factory. We also accept customized orders.
Pressure Seat Swing Check Valve, Single Disc Swing Check Valve, Lift Flange Check Valve(0/10)
