PUMING SYSTEM

摘要

A pump unit which includes a pipe, a flexible bladder inside the pipe, an operating volume between an outer surface of the bladder and an opposing inner surface of the pipe, a valve arrangement to introduce pressurised water into the operating volume and to allow pressurised water to flow from the operating volume and another valve arrangement to allow slurry to flow into the interior of the bladder as water is expelled from the operating volume and to—allow slurry to flow from the bladder when water is introduced into the operating volume.

主权项

1. A pump unit comprising:
an elongate tubular housing with an inner surface, an inner bore, a first end and an opposing second end, an elongate flexible bladder of tubular form with an outer surface, an interior, an inlet, at one end of the bladder, to the interior, and an outlet, at an opposing end of the bladder, from the interior, wherein the bladder is positioned inside the bore with the bladder in sealing engagement with the housing at opposed ends of the bladder whereby the inlet is in communication with the first end of the housing, the outlet Is in communication with the second end of the housing and an operating volume of variable size is formed between the outer surface of the bladder and the opposing inner surface of the housing, a port for an actuating fluid which is provided on the housing in communication with said operating volume, an inlet non-return valve connected to the first end of the tubular housing, an outlet non-return valve connected to the second end of the tubular housing, a first control valve for controlling the flow of the actuating fluid through the port into the operating volume, and a second control valve for controlling the flow of the actuating fluid from the operating volume through the port.