Displacement shift valve and pumping apparatus and methods...

Details Displacement shift valve and pumping apparatus and methods... Displacement shift valve and pumping apparatus and methods...

2006-01-17

2006-01-17

Lopez, F. Daniel (Department: 3745)

Motors: expansible chamber type

Relatively movable working members with one having motive...

One working member oppositely biased by another

C091S520000, C091S536000, C417S342000, C417S900000

Reexamination Certificate

active

06986303

ABSTRACT:
Apparatus and methods are provided for pumping concrete using a pumping apparatus including first and second drive cylinders, a valve, and a pump. Fluid is delivered into the cylinders from the pump to reciprocate pistons within the cylinders. Pressure within the cylinders is monitored, and a direction of flow of the fluid is switched based upon the pressure within the cylinders. For example, during rod-side operation, the valve is set to deliver fluid into a head side of the cylinders. When the pressure exceeds a predetermined threshold, the valve switches to head-side operation, and fluid is delivered into a rod side of the cylinders. If the pressure falls below the threshold, the valve switches the cylinders back to rod-side operation.

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