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Double check valve. 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 ...
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. [1] 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 ...
During the 1980s, George Michael scored four number-one singles as a solo artist, three with Wham! and one as a duet with Aretha Franklin. Olivia Newton-John 's " Physical " remained the longest at the top of the Billboard Hot 100 chart during the 1980s (10 weeks). #. Reached number one. Artist (s)
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The AP is solely responsible for all content. The popular deli meat company Boar's Head is recalling an additional 7 million pounds of ready-to-eat products made at a Virginia plant as an ...
Heat over medium-high heat until thermometer registers 375°. With a lid handy and working in batches, fry pork, partially covered to minimize oil splatter, until deep golden brown and crisp all ...
Tulsa officials announced the creation of a new commission to recommend how reparations can be made for a 1921 massacre that destroyed a thriving Black community in the city. The panel will review ...
A U.S. Air Force North American OV-10A-30-NH Bronco in flight with two North American F-100C Super Sabres of the 136th Tactical Fighter Squadron. Forward air controllers (FACs) played a significant part in the Vietnam War from the very start. Largely relegated to airborne duty by the constraints of jungled terrain, FACs began operations as ...