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The lane is prone to tidal flooding and the outfall is protected by a flap valve. The damage proved to be sufficiently extensive to justify a temporary repair and letting a contract for permanent replacement of a long section. In February 1979, a further collapse occurred 100 metres upstream to the south, in the busy A307 carriageway.
Double dump valves have two trap-door flap plates which open and close on an alternating cycle. The top gate opens to allow collected material to drop through onto the bottom gate. The top gate then re-closes to prevent air leakage above the valve. The bottom gate then opens to allow material to pass completely through the valve.
Swirl flap principle in a four-valve engine. A swirl flap is a small butterfly valve fitted to four-stroke internal combustion engines with at least two intake valves.It is installed inside or just before one of a cylinder's two intake ports, allowing to throttle its intake port's air flow, causing a swirl in the other intake port not fitted with a swirl flap.
Since the engine was rather simple, low-grade gasoline could be used and a good amount of thrust — 2.7 kN (660 lb f) — was produced, but it was inefficient, limiting the range of the V-1 to 240–400 km (150–250 mi) The resonant frequency of this combustion process was around 45 Hz, giving the V-1 its nicknames "buzz bomb" or "doodlebug ...
This article lists different types of pump and provides a comparison of certain key design features. Different types of pumps are suitable for different applications, for example: a pump's maximum lift height also determines the applications it can be used for.
On the up stroke of the piston the foot valve opens and suction brings water into the pump head. On the following down stroke of the piston the valve on the piston opens up and allows water to flow above the piston. On the successive up stroke of the piston water is pushed out of the outlet. A rural handpump in Belgium.
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The valve is nothing more than a flap of leather that is mounted so as to block the airway when air pressure becomes greater on the inside than on the outside. Bellows-operated pipes usually have two flap valves, one in the air-inlet (in one of the bellows-cheeks) and the other in the connecting pipe between the bellows and the bag. Flea hole