Dump valves are fitted to the engines of (usually older) turbo charged cars and sit between the turbo outlet and the throttle body. When transitioning from a boosted state to a closed throttle state (as in between shifts), due to inertia, the turbo continues to pressurize air, but the closed throttle prevents the compressed air from entering the engine. In this case the pressure exceeds the preset spring pressure in the dump valve and the excess pressure is bled off to atmosphere. “Turbo†redirects here. ... Inertia is the property of an object to remain at constant velocity unless acted upon by an outside force. ...
Even with a dump valve the compressed air acts as a brake on the turbo (slowing it down), because the pressure on the backside of the turbo is at a higher pressure than on the front side (and the air actually wants to flow through the turbo backwards).
A blowoff valve is a more elegant solution to this problem by allowing the turbo to "freewheel" when the throttle is closed (equalizing the pressure on both sides of the turbo). Unlike a dump valve a blowoff valve can be used at multiple boost settings without reconfiguration. // Introduction The term blowoff valve is commonly used in the disussion of turbocharged vehicles. ... Freewheel mechanism In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. ...
Blowoff valves are sometimes incorrectly called dump valves because they serve a similar function, but they are very different solutions to the same problem.
One of the most famous pioneers of Dump Valves is Daivd Cole. Using his dump valve to make his car sound sweet when he changed gears, he also attracted all the ladies with his hot ride.
As a subcombination a dumpvalve for a swab assembly comprising,
Another object is to provide a swab assembly in which a dumpvalve relieves the fluid load on a swab cup upon an excess force being exerted on the assembly and in which the interior of the swab cup is exposed to dumped fluid to wash solids from the interior of the cup.
Whether the valve member be engaged with the cup or with the mandrel is not critical so long as the load on the cup is imposed on the valve member and the valve member and the remainder of the dumpvalve be moved relative to each other in response to an excess load.
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