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Gongyi xinhuafeng pipeline equipment co. LTD. [Henan,China] Business Type:Manufacturer Main Markets: Americas , Worldwide , Asia , Other Markets , Europe , North Europe , West Europe , Africa , Caribbean , East Europe , Middle East , Oceania Exporter:31% - 40% Certs:ISO9001

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What are the differences between flange integral duckbill check valve and flanged duckbill check valve?

2025-07-08

Inline Flanged Series Rubber Duckbill Check Valve and Inline Duckbill Check Valve are two common types of valves that differ significantly in their structure and usage. Below is a detailed introduction to the differences between these two types of valves.

1.Structural Differences

A Flange Integral Duckbill Valve is a Valve integrated inside the pipeline. It has a relatively simple structure, consisting of a Valve Body, valve disc, valve stem, and sealing ring. The valve body is integrated with the pipeline, the valve disc is controlled by the valve stem for opening and closing, and the sealing ring ensures the valve's tightness.

A Flanged Duckbill Valve, on the other hand, is a valve mounted on the pipeline. It has a more complex structure, comprising a valve body, valve disc, valve stem, flanges, and sealing ring. The valve body and valve disc are integrated, the valve stem controls the opening and closing of the valve disc through rotation, and the flanges are used to connect the pipeline and the valve, while the sealing ring ensures tightness.

2.Installation Differences

The installation of a Built-in Duckbill Valve is relatively simple, as it only requires the valve to be installed inside the pipeline. However, due to its inaccessible installation position, maintenance and repair can be challenging.

The installation of a flanged duckbill valve is more complex, as it necessitates connecting the valve to the pipeline using flanges. Nevertheless, its easily accessible installation position facilitates convenient maintenance and repair.

3.Application Scope Differences

Built-in Duckbill Valves are suitable for small pipelines and low-pressure systems, such as water supply systems and air conditioning systems. Due to their simple structure, they are relatively inexpensive.

Flanged duckbill valves are applicable to large pipelines and high-pressure systems, such as those in the petroleum, chemical, and metallurgical industries. Given their complex structure, they are more expensive.

In summary, built-in duckbill valves and flanged duckbill valves exhibit significant differences in terms of structure, installation method, and application scope. When selecting a valve, it is essential to choose the appropriate type based on the specific usage scenario and requirements.

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