Duckbill valve - valve used to prevent back flow. Article “Duckbill valve” in English Wikipedia has 18.1 points for quality (as of July 1, 2025). The article contains 2 references and 1 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 0.95 points.
Since the creation of article “Duckbill valve”, its content was written by 10 registered users of English Wikipedia and edited by 10 registered Wikipedia users in all languages.
The article is cited 10 times in English Wikipedia and cited 10 times in all languages.
The highest Authors Interest rank from 2001:
The highest popularity rank from 2008:
There is 1 language version for this article in the WikiRank database (of the considered 55 Wikipedia language editions).
The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).
| Best Rank | English: #787099 05.2008 |
Global: #1287566 05.2008 |
| Best Rank | English: #140646 09.2007 |
Global: #345976 09.2007 |
On 10 February 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Jeffrey Epstein, Ghislaine Maxwell, Ilia Malinin, Bad Bunny, 2026 Winter Olympics, Epstein files, Jutta Leerdam, Jake Paul, Puerto Rico, Little Saint James.
In English Wikipedia the most popular articles on that day were: Bad Bunny, Jeffrey Epstein, Epstein files, Ilia Malinin, Savannah Guthrie, Ghislaine Maxwell, 2026 Winter Olympics, List of Super Bowl halftime shows, Eileen Gu, Jutta Leerdam.
The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information
$$Quality=1/c∑↙{i=1}↖c nm_i-RS=1/5(4.25+1.63+42.86+7.14+39.31)-0.95$$
where:
The results of the calculations may be slightly different because of rounded values of normalized metrics in formulas
