Single Layer Flap Valve

A Single Layer Flap Valve,also referred to as a single-disc flap valve,is a simple,cost-effective one-way isolation valve featuring a single hinged flap(disc)as its core closing component.It is designed to allow one-way flow of media while preventing backflow,with a straightforward structure that makes it suitable for general industrial and municipal applications where high-pressure or harsh media conditions are not required.As a basic type of flap valve,it balances reliability and economy,widely used in low to medium pressure pipelines for fluid and gas control.

The working principle of the single layer flap valve is simple and energy-efficient,relying solely on the pressure difference of the medium and the weight of the single flap.When the medium flows forward,its pressure pushes the hinged single flap open,creating an unobstructed flow channel with low flow resistance,ensuring smooth medium circulation.When the medium stops flowing or attempts to reverse,the single flap automatically closes under the combined action of reverse medium pressure and its own weight,tightly adhering to the valve seat to form an effective seal,thereby preventing backflow and avoiding potential damage to pipelines and equipment.

Key features of the single layer flap valve include a simple and compact structure:with only one flap and a hinge,it has fewer moving parts,leading to low failure rates and easy maintenance.It is lightweight and easy to install,compatible with both horizontal and vertical pipeline installations.The valve body is usually made of ductile iron,cast iron,or carbon steel,while the single flap is made of stainless steel or ductile iron for basic corrosion and wear resistance.The seal is typically made of EPDM or NBR,ensuring reliable sealing for common media without leakage.

Technical specifications:Size ranges from DN50 to DN800,pressure rating PN6-PN16,temperature range-10°C to 200°C.Connection types include wafer,lugged,and flanged(complying with GB,DIN,ANSI standards).It is suitable for various common media,including clean water,sewage,ordinary oil,and non-corrosive gases.

Widely applied in municipal and general industrial scenarios,it is commonly used in water supply and drainage pipelines,sewage treatment plants(low-pressure sections),residential plumbing systems,small-scale power plants,and light chemical industries.Its simple structure,low cost,and easy maintenance make it a practical choice for basic backflow prevention needs,especially in small to medium diameter pipelines where high-performance requirements are not mandatory.