Process and device for pumping compressible materials with reduced pressure pulsation

• US 6,609,898 B1
• Filed: 10/01/2001
• Issued: 08/26/2003
• Est. Priority Date: 10/01/2001
• Status: Expired due to Fees

• Current Assignee: Putzmeister, Inc.
• Original Assignee: Putzmeister, Inc.
• Inventors: Bury, James L.
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): Solak, Timothy P.
• Application Number:
  US09/968,601
• Time in Patent Office: 694 Days
• Field of Search: 417/46, 417/900, 417/342, 417/347, 417/401, 417/390
• US Class Current: 417/347
• CPC Class Codes: F04B 2201/0202 Linear speed of the piston
• CPC Class Codes: F04B 9/1178 the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
• CPC Class Codes: Y10S 417/90 Slurry pumps, e.g. concrete

Abstract

A hydraulic system for a reciprocating piston pump that includes an accumulator for producing a steady-pressure supply of compressible material to a distribution nozzle. The hydraulic system includes an adjustable means for constricting the flow of hydraulic fluid from the accumulator to the hydraulic system. The means for constricting the flow of hydraulic fluid allows the operator to compensate for the type of material being pumped, the vertical distance the material is being pumped, as well as the overall distance the material is being pumped in order to reduce or eliminate line surge. The means for restricting the flow from the accumulator preferably includes a needle valve that allows the operator to select the flow characteristic from the accumulator.

Claims

1. A method of reducing line surge in a twin cylinder reciprocating piston pump used to pump compressible material, the reciprocating piston pump being driven by a hydraulic system, the method comprising the steps of:

positioning an accumulator between a hydraulic fluid pump of the hydraulic system and the reciprocating piston pump, the accumulator including a volume of hydraulic fluid;

positioning a flow control valve between the accumulator and an outlet line supplying hydraulic fluid to the reciprocating piston pump; and

adjusting the flow control valve to selectively control the output from the accumulator, the output from the flow control valve being selected to reduce line surge.

2. The method of claim 1 further comprising the step of adjusting the output from the flow control valve based upon the type of compressible material being pumped.

3. The method of claim 1 further comprising the step of adjusting the output of the flow control valve based upon the distance the material is being pumped.

4. The method of claim 1 wherein the flow control valve is infinitely adjustable within a valve range from an open position to a closed position.