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2. Control valve - Wikipedia

   en.wikipedia.org/wiki/Control_valve

   A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.

3. Reed valve - Wikipedia

   en.wikipedia.org/wiki/Reed_valve

   Reed valves are a type of check valve which restrict the flow of fluids to a single direction, opening and closing under changing pressure on each face. Modern versions often consist of flexible metal or composite materials ( fiberglass or carbon fiber ).

4. Geoduck aquaculture - Wikipedia

   en.wikipedia.org/wiki/Geoduck_aquaculture

   The PVC tubes are between 5 and 15 cm in diameter, with lengths from 20 to 30 cm, about 7 cm of which remain above the substrate. The plastic tubes are covered with a mesh net to protect the clams from predators.

5. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   PVC roofing is a Thermoplastic system, meaning that it is heat-welded at the seams forming a permanent, watertight bond that is typically stronger than the membrane itself. PVC resin is modified with plasticizers and UV stabilizers, and reinforced with fiberglass non-woven mats or polyester woven scrims, for use as a flexible roofing membrane.

6. Washing machine - Wikipedia

   en.wikipedia.org/wiki/Washing_machine

   A very effective precaution is to install a shutoff or isolation valve which stops any water from being supplied, except when a washing machine is actually operating. The simplest method is to manually open and close the hot and cold water shutoff valves (traditionally globe valves) behind the washing machine, each time it is used. This method ...

7. Economy of West Bengal - Wikipedia

   en.wikipedia.org/wiki/Economy_of_West_Bengal

   Rice and potato are considered to be the principal food crops. The state is the largest source of the important food crop of rice, a staple diet across India, with an annual output of around 16.76 million tonnes (about 13% of total production in India) in FY 2021–22, and the second-largest producer of potatoes in India with an average annual output of 12 million tonnes (about 20% of total ...