Check valve

Backward flow pushes a ball against a hole, preventing outward flow through the hole. A spring expands to help hold the ball in place.

The check valves on this steam locomotive are located under the small cover between the chimney and the main dome

A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

单词	Check valve
释义	Check valve 原声例句 CNN 10 学生英语 2022年9月合集 Critical pre-launch tests have been hampered by issues with propellant loading and a malfunctioning helium check valve. 关键的发射前测试因推进剂装载问题和氦止回阀故障而受阻。实习医生格蕾第2季 Although it would be unusual for rheumatic heart disease to cause ventricular dysrhythmias, we've still got to check your valves. 也许那对风湿性心脏病来说，心室疾病不太常见，但我们还是要检查下你的瓣膜。英语百科 Check valve A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.
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