Patent ID: 11859612
Assignee: TPE MIDSTREAM LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 17:
18. A fluid transfer apparatus comprising:
a drive chamber having a first end and a second end opposite the first end;
a first cylinder coupled to the first end of the drive chamber;
a second cylinder coupled to the second end of the drive chamber;
a first fluid line to provide inlet fluid from a fluid inlet port to the first cylinder;
a second fluid line to provide outlet fluid from the second cylinder to a fluid outlet port;
a drive assembly moveable in a reciprocating manner between a first movement in a first direction and a second movement in a second direction opposite the first direction, the drive assembly including:
a rod coupled to and extending through the drive chamber, a first portion of the rod extending into the first cylinder, a second portion of the rod extending into the second cylinder;
a first piston coupled to the first portion of the rod and disposed in the first cylinder, the first piston dividing an interior volume of the first cylinder into a first interior volume portion and a second interior volume portion, the first interior volume portion fluidly coupled to the first fluid line; and
a second piston coupled to the second portion of the rod and disposed in the second cylinder, the second piston dividing an interior volume of the second cylinder into a third interior volume portion and a fourth interior volume portion, the third interior volume portion fluidly coupled to the second fluid line;

a third fluid line fluidly coupling the first interior volume portion of the first cylinder and the third interior volume portion of the second cylinder, such that during the first movement, fluid in the first interior volume portion of the first cylinder is transferred to the third interior volume portion of the second cylinder;
a switching control valve to alternate a flow of pressurized air into two portions of the drive chamber to move the drive assembly in the reciprocating manner;
a fourth fluid line to route the pressurized air from a pressurized air source to the switching control valve;
an inlet fluid under-pressure cutoff switch fluidly coupled between the first fluid line and the fourth fluid line;
a discharge fluid overpressure cutoff switch fluidly coupled between the second fluid line and the fourth fluid line; and
a control valve cutoff to stop the switching control valve, the control valve cutoff communicatively coupled to the inlet fluid under-pressure cutoff switch and the discharge fluid overpressure cutoff switch.