check valve

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check valve

[′chek ‚valv]
(mechanical engineering)
A device for automatically limiting flow in a piping system to a single direction. Also known as nonreturn valve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Check Valve


a device that passes a stream of fluid or gas through a pipe only in one direction and closes automatically when the direction of the stream reverses. It is used in various thermal power engineering and production plants.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

check valve, back-pressure valve, reflux valve

check valve
An automatic valve which permits liquid to flow in only one direction. Also see non-return valve.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

check valve

check valveclick for a larger image
Two types of check valves.
A valve that permits the flow of fluid in one direction only. Various types of check valves are depicted in the illustrations.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In locking-ring check valves, the ring rotates with the screw during plastication and moves horizontally during injection.
The spring can be heat treated and cleaned using special processes depending on the working condition of the check valve. An example of a general Saint-Gobain Seals' anti-blowout seal in a rod sealing application is shown in the illustration at left (note: this illustration is different than the seal used in the actual check valve application, which is custom-designed).
"We are very pleased to have a barbed check valve option for our customers," said Ken Davis, global product line manager.
Available in sizes from 3" - 12" / DN80 - DN300 and rated at 16 bar (230psi), the single plate Wafer Check Valve adds to Shipham Valves existing range of composite valves.
The check valves are cast and machined in carbon steel and then shipped to Arc Energy's Gloucestershire factory for weld overlay cladding, with Inconel 625 being applied to all wetted surfaces.
To quiet them, replace the old check valve with a "silent" or "soft close" check valve.
Check valves are used to prevent water pumped to an overhead tank from flowing back when the pump stops.
Clear and custom-colored Cyrolite CG-97 is an acrylic-based multi-polymer compound that is now specified for check valves, female luers, lining and pediatric filters, and Y connectors.
Thermoplastic manifold type check valve is designed to prevent reverse flow while simplifying installation of multiple check valves.
Tests revealed that a group of valves, known as check valves, were leakier than expected.