Abstract: A hydraulically-driven pump of the displacement type intended particularly for pumping various suspensions of liquids and solid particles (slurry) and/or for high pumping pressures comprises a pump housing with a pump chamber (4) with an inlet pipe and an outlet pipe, and associated inlet, and outlet valve, respectively, and a pump piston, disc (16) or corresponding provided in the pump chamber.

Abstract: A method and apparatus for pumping fluids, especially viscous and/or abrasive fluids, are disclosed. The method comprises using one working fluid to pump an intermediate working fluid, which may be different from the first working fluid, through a conduit system in a smooth and continuous pulsating manner. The intermediate fluid pumps the process fluid through the actual pumping zone. Heat exchange between the intermediate and process fluids may be effected, e.g. by counterflow. The preferred apparatus comprises a hydraulically operated displacement pump. A tubular diaphragm pump is coupled in-line in a pipe line. The tubular diaphragm pump includes a housing coupled to the pipe line, and a tubular diaphragm coupled to the housing in such a manner that the process fluid flows from the pipe line, through the interior of the tubular diaphragm and back into the pipe line. A check valve insures that the process fluid passes through the tubular diaphragm in a single direction.

Abstract: A pressure regulator in which inlet pressure from a pressure medium is regulated by movable control means which occupies a position representative of a balanced condition between a predetermined force applied to the control means and representative of the desired pressure, and a counter force applied through the control means to the primary force application means whereupon the control means allows a part or all of the pressure medium to reach the pressure regulator outlet and whereby the remaining portion or none of the inlet pressure is bypassed through a bypass outlet.The desired pressure level at the outlet of the regulator may be altered by varying the force applied to the control means, typically through the use of weights of varying magnitude.