| 摘要 |
An intensifier unit includes a pair of sequentially operated reciprocating ram assemblies, novel valving systems for controlling the relative movement of the ram assemblies to effect an output of working fluid having a minimum of pressure fluctuations, and a novel pneumatic control system for controlling the valving systems in response to the positions of the ram assemblies. In the preferred embodiment, the unit is mounted on a truck for use in high pressure operations, such as well fracturing, erosion drilling, or the like, and the rams have relatively large diameters and relatively long strokes for providing a minimum of wear and fatigue cycles. In the method, the ram assemblies are returned quicker than they are extended, and are sequentially pressurized prior to initiation of their forward strokes and prior to the decompression of the stroke of the preceding working cylinder to provide an essentially uninterrupted pressure delivery of working fluid to the well. |
