Gas actuated proportioning pump

• US 4,730,991 A
• Filed: 07/29/1986
• Issued: 03/15/1988
• Est. Priority Date: 07/29/1986
• Status: Expired due to Term

• Current Assignee: James M. Grenntree
• Original Assignee: James M. Greentree
• Inventors: Handfield, Gerard J.
• Primary Examiner(s): Smith, Leonard E.
• Application Number:
  US06/890,395
• Time in Patent Office: 595 Days
• Field of Search: 417/397
• US Class Current: 417/397
• CPC Class Codes: F04B 9/133 reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor

Abstract

A gas pressure operated proportioning pump is provided including axially aligned and spaced opposed end pumping cylinders and an intermediate drive cylinder provided with centrally apertured opposite end cylinder heads. A piston is reciprocal in the drive cylinder and includes oppositely axially projecting diametrically reduced pumping pistons extending and reciprocal through the cylinder heads in sliding sealed engagement therewith and projecting into the adjacent ends of the pumping cylinders. The pumping cylinder adjacent ends include seal structure slidingly and sealingly engaged with the pumping pistons and the remote ends of the pumping cylinders include check valve equipped fluid inlet and outlet ports. Fluid pressure and supply discharge structure is included for inversely supplying and discharging drive fluid to and from the opposite ends of the drive cylinder and alternating the drive cylinder ends to and from which drive fluid is supplied and discharged in sequence with reciprocation of the drive piston.

Claims

1. A natural gas driven pump for glycol metering in a dehydrator system of a gas well, said pump including support structure defining a pair of spaced apart first mounting portions, a pair of cylinder heads removably stationarily supported from said mounting portions in predetermined positions thereof, an open ended drive cylinder extending between and removably mounted from said heads in keyed positions relative thereto, a pair of second mounting portions carried by said support structure spaced from and on remote sides of said heads, said heads including aligned central bores formed therethrough, a drive piston reciprocal in said drive cylinder and including oppositely axially projecting pump pistons projecting through said central bores, first radially fixed annular seal means removably mounted in the remote ends of said central bores, said second mounting portions including mounting flanges disposed generally normal to said cylinder and having through bores formed therein substantially coaxial with said drive cylinder and central bores, the remote ends of said through bores including counter bores in which second radially shiftable annular seal means are seated and through which said pump pistons are sealingly slidingly received, a pair of axially aligned pump cylinders including closed remote ends and open adjacent ends, said open adjacent ends beings removably mounted from said flanges over said counter bores closing said adjacent ends and removably securing said second annular seal means in adjusted radially shifted positions in said counter bores, said pump pistons being sealingly and slidingly received through said second annular seal means and projecting into the adjacent ends of said pumping cylinders, fluid pressure supply and discharge means operatively associated with each of the remote ends of said drive cylinder for supplying and discharging drive fluid under pressure to and from said drive cylinder ends and incorporating fluid pressure actuated reversing valve means for alternately inversely communicating said drive cylinder ends with a pressurized drive fluid source and a drive fluid discharge, each drive cylinder end including pressurized operating fluid supply means and drive piston engageable control means for supplying operating fluid under pressure to said valve means for alternate actuation thereof responsive to reciprocation of said drive piston in said drive cylinder, the remote ends of said pumping cylinders each including check valve equipped fluid inlet and outlet means for receiving and discharging fluid to be pumped.

2. The pump of claim 1 wherein said fluid pressure supply and pressurized operating fluid supply means comprise natural gas under pressure and said fluid to be pumped comprises ethylene glycol.

3. The pump of claim 1 wherein said second annular seal means includes axially facing O-ring seal means axially compressed against each of the corresponding adjacent ends of said pumping cylinders.

4. the pump of claim 3 wherein axial compression of said second annular seal means serves to frictionally retain radial positioning of said second seal means relative to the corresponding pumping cylinder.

5. The pump of claim 1 wherein said check valve equipped fluid inlet and outlet means is mounted on each of the remote ends of said pumping cylinders through the utilization of axially compressed annular seal means.

6. The pump of claim 5 wherein said check valve equipped fluid inlet and outlet means each are covered by through passage equipped cover means mounted thereon by means including an axially compressed O-ring extending about the corresponding through passage.