What is another word for clack valve?
Pronunciation: [klˈak vˈalv] (IPA) 
A clack valve, also known as a check valve, is a one-way valve that allows fluid or gas to flow in only one direction. There are many different words and phrases that can be used to describe this type of valve, including non-return valve, one-way valve, backflow preventer, and flap valve. Other related terms include spring check valve, swing check valve, and ball check valve, which all work in slightly different ways but accomplish the same basic function. No matter what you call it, a clack valve is an essential component in many different types of systems, from plumbing and heating to irrigation and industrial processes.
