You can start checking on the status of your return within 24 hours after we have received your electronically filed tax return or 4 weeks after you mail a paper tax return. Q7: How often does Whereâs My Refund? update? Whereâs My Refund? updates are made no more than once per day, usually at night.
How Piezo Injectors Work. The heart of a Piezo (short for piezoelectric) injector is the piezo crystal. When electricity is applied to the crystal, it rapidly expands, thus making it suitable to act as the actuator in a diesel fuel injector.ressurized fuel is delivered to the top of this needle as well, the force of which keeps the needle closed. When the piezo crystal is energized, a valve at the top of the needle opens, allowing the pressurized fuel at the top of the needle to return to the tank through the return line.
An example of a non-positive pump is a centrifugal pump. This type of pump will not pump gases and therefore requires a primer. Ejector Pumps These types of pumps do not use either mechanical pistons or plungers to increase or decrease the pressure but use a fast moving jet of liquid or gas to do the same job. This jet is called a propellant. The ejector pump uses a venture effect within the throat of the pump. At the throat an area of low pressure is created by the fast moving propellant, any movement outside this area being at a higher pressure will flow into the pump. This fluid and the propellant are discharged at the outlet.