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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.
Sometimes called a check valve or a backflow preventer, a chemigation valve is an apparatus designed to protect water supplies from agricultural chemicals used during chemigation, the application of chemicals such as fertilizers and pesticides through irrigation water. [1]
The check valve aspect is a conical valve or 'mitre valve', [i] held against a matching conical seat by a spring. As these valves must work at high pressure, the valve faces are accurately ground to shape. The valve is also held accurately concentric to its seat by a fluted extension, usually cross-shaped or three-winged, below the seat.
Patents exist in the United States which specify the mechanical use of leaf valves to control various types of fluids. United States Patent 4930535 is a folding leaf valve which is described as a valve that, "folds upon itself to provide positive sealing of a pressurized chamber under a variety of pressure conditions. In particular, the valve ...
The U.S. Preventive Services Task Force is looking to update its recommendations for screening for cervical cancer. The task force has introduced a recommendation that women over the age of 30 ...
A Canadian woman was arrested after trying to smuggle over 20 pounds of methamphetamine through a New Zealand airport, authorities said. The illicit drugs were disguised as Christmas presents, New ...
This sweater and wide-leg pant set looks way more high-end than the price suggests. The slouchy oversized silhouette is the perfect comfy, ready-for-a-cozy-day-at-home fit.
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.