Description

An ejector is a simple, low-cost, maintenance-free vacuum pump that uses water hydraulic power. It is composed of three elements: a body, nozzle, and diffuser. It operates on the principle that when water is injected at high speed by the nozzle, the pressure reduces below that of its surroundings due to the Venturi effect. When the reduced pressure water flows into the surrounding fluid, the pressure at the suction inlet port is reduced. An ejector can provide negative pressure for use in a plant with no negative pressure piping network, for example enabling residual internal bladder pressure in a tire curing press to be forcibly extracted to collapse the bladder. It can also regulate negative pressure (suction) by adjusting the hydraulic pressure (flow) supplied by the ejector.