flap type check valve Description
A flap check valve is a valve that automatically opens and closes the valve disc to achieve unidirectional flow of the medium. It is mainly used to prevent fluid backflow in the pipeline system.
Core structure and composition
Basic components
The valve body, valve disc, valve stem, and spring are the main components. Some types adopt a double-flap design (such as a double-flap check valve with a wafer), which improves sealing through two independent valve discs.
The rubber flap check valve uses an elastic rubber valve disc as a key seal to buffer water hammer impact.
Connection method
The wafer structure is installed by flange clamping, saving space and no welding is required; the lug type is suitable for specific industrial standards.
Working principle
Automatic opening and closing mechanism
During forward flow, the fluid pressure pushes the valve disc open to allow the medium to pass; during reverse flow, the valve disc closes quickly under the action of gravity, spring or medium pressure to block backflow.
The double-flap structure reduces valve disc vibration and improves closing response speed through a split design.
Anti-water hammer design
The rubber material or double-flap structure can absorb the impact force when closing, reducing the risk of damage to the pipeline system caused by pressure fluctuations.
flap type check valve specification
Design and manufacturing :API 594, API 6D, JB/T 8937:
Structure length:API 594, API 6D, DIN 3202, JB/T 8937;
Pressure-temperature rating :ANSIB 16.34, DIN 2401, GB/T 9124, HG 20605, SH 3406, JB/T74;
Test and inspection :API 598, JB/T 9092:
Pipe flange; JBT 74~90, GB/T9112~9124, HG20592~20635, SH 3406, ANSIB 16.5, DIN 2543~2548, GBT 13402, AP1 605,ASME B 16.47.
Classification and characteristics:
flap type check valve
Applications
Municipal engineering: urban water supply and drainage networks, sewage treatment systems;
Industrial systems: oil and natural gas pipelines, chemical reaction devices;
Construction: high-rise building water pump outlets to prevent medium backflow when the pump is stopped
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