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.
â¢ Some crystals, when squeezed, make a spark. â¢ Turns out the process goes the other way too. â¢ Spark a quartz crystal, and it ï¬exes. â¢ Piezo buzzers use this to make sound. (ï¬ex something back and forth, it moves air) Piezo buzzers donât have quartz crystals, but instead a kind of ceramic that also exhibits. piezoelectric properties.