Jet pump air

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Please use caution when checking anything electrical.  Pumps use 115 or 230 volts AC which can injure or kill. 

Inspect wiring, pressure switch, and motor for a problem that would have tripped the breaker or popped the fuse.  Repair problem then replace fuse or reset breaker

Many pumps have dual voltage motors.  Consult owners' manual to find how to set the pump to the correct voltage according to what the voltage is that it will actually be connected to.

A steam injector is typically used to deliver cold water to a boiler against its own pressure using its own live or exhaust steam, replacing any mechanical pump . This was the purpose for which it was originally invented in 1858 by Henri Giffard . Its operation was from the start intriguing since it seemed paradoxical, almost like perpetual motion, but its operation was later explained using thermodynamics . [1] Other types of injector may use other pressurised motive fluids such as air.

Depending on the application, an injector can also take the form of an eductor-jet pump , a water eductor or an aspirator . An ejector operates on similar principles to create a vacuum feed connection for braking systems etc..

The injector was invented by Henri Giffard for the steam locomotive [2] and patented in the United Kingdom by Messrs Sharp Stewart & Co. of Glasgow .

Air Jet Ejectors are based on the ejector-venturi principal and operate by passing motive air or gas through an expanding nozzle. The nozzle provides controlled expansion of the motive gas to convert pressure in to velocity which creates a vacuum with in the body chamber to draw in and entrain gases or vapours. The motive gas and suction gas are then completely mixed and then passed through the diffuser or tail, where the gases velocity is converted in to sufficient pressure to meet the predetermined discharge pressure.

Vacuum Ejectors are used in a variety of applications in the process, food, steel and petrochemical industries. Typical duties involve filtration, distillation, absorption, mixing, vacuum packaging, freeze drying, dehysrating and degassing. Ejectors will handle both condensible and none condensible gas loads as well as small amounts of solids or liquids, however accidental entrainment of liquids can cause a momentary interruption in vacuum but this will not cause damage to the ejector.

More recently Air Ejectors have been used for leak testing of under sea pipework, where high levels of vacuum are applied and held on several hundred kilometers of pipe for several days. For these applications several Air Ejectors (either single stage or two stage systems) are used in parallel in reduce the overall duty cycle time.

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