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Variable speed pumps were replaced with two-speed pumps (each rated at 35,400 US gallons per minute (2.23 m 3 /s) for a discharge pressure head of 865 feet (264 m)), and a flow control valve (adjustable from 22% open to 100% open with a linear flow response) was added to each loop for use in regulating recirculation flow (capable of regulating ...
In the 1980s, Monarch Spas developed the dual-zone swim spa, allowing the pumps and other equipment needed for the pool to also power a separate spa. One advantage of the modern dual-zone system is the ability to set different temperatures and use different chemicals in each pool area.
Piston pumps can be made variable-displacement by inserting springs inline with the pistons. The displacement is not positively controlled, but decreases as back-pressure increases. Another variation is the variable-displacement vane pump, a type that has found usage in motor vehicle automatic transmissions, such as the General Motors Hydra-Matic.
The high speed rotational output of the motor must be converted to lower speed reciprocating motion of the pistons. One way this has been done (Dräger and Russian KN-3 and KN-4 military boosters) is to connect the motor to a worm drive gearbox with an eccentric output shaft driving a connecting rod which drives the double-ended piston via a ...
Water is forced through a filter and then returned to the pool. Using a water pump by itself is often not sufficient to completely sanitize a pool. Commercial and public pool pumps usually run 24 hours a day for the entire operating season of the pool. Residential pool pumps are typically run for 4 hours per day in winter (when the pool is not ...
A small, electrically powered pump A large, electrically driven pump for waterworks near the Hengsteysee, Germany. A pump is a device that moves fluids (liquids or gases), or sometimes slurries, [1] by mechanical action, typically converted from electrical energy into hydraulic or pneumatic energy.
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