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Swagelok Company is a $2 billion privately held developer of fluid system products, assemblies, and services for the oil and gas, chemical and petrochemical, [2] semiconductor, and transportation industries.
Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams.The arrow shows the flow direction. Vertical lift check valve. A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
Duckbill valves attached to the hood and shoulders of a Soviet "GP" professional dry suit. Also known as a spear valve or flutter valve, this automatic device serves as a gas exhaust valve on the inside of some twin-hose diving regulators and as an excess gas release valve on the outside of certain mid-twentieth-century dry diving suits.
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