Pistons and related methods may be configured to separate fluids and to at least partially prohibit one fluid from traveling to one side of the piston from another side of the piston. Pressure exchange devices and systems may include such pistons.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising offset openings positioned along a path of a valve actuator. The offset openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising offset openings positioned along a path of a valve actuator. The offset openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

A pumping system that includes a reciprocating isobaric pressure exchanger (reciprocating IPX) designed to exchange pressures between a first fluid and a second fluid. The first fluid includes a substantially particulate free fluid and the second fluid includes a particulate laden fluid. The reciprocating IPX includes a valve having a first and second piston. The value further includes a shaft coupling the first piston to the second piston and a drive coupled to the shaft.

A pumping system that includes a reciprocating isobaric pressure exchanger (reciprocating IPX) designed to exchange pressures between a first fluid and a second fluid. The first fluid includes a substantially particulate free fluid and the second fluid includes a particulate laden fluid. The reciprocating IPX includes a valve having a first and second piston. The value further includes a shaft coupling the first piston to the second piston and a drive coupled to the shaft.

A method for optimizing pressure exchange includes providing a first pressure exchange system comprising an energy recovery device (ERD). A second system supplies high-pressure fluid, energized by a positive displacement pump, to the ERD. A third system supplies low-pressure fluid to the ERD. The first system energizes the low-pressure fluid with the high-pressure fluid to form a high-pressure fracking fluid, which is delivered from the first system to a well-head. A rate of required flow is input into a control system, which determines a rate of flow of the high-pressure fluid, a rate of flow of the low-pressure fluid, and an actual rate of flow of the fracking fluid at the well-head. The control system then adjusts to equilibrium: the rate of flow of the high-pressure fluid based on the actual rate of flow; and the rate of flow of the low-pressure fluid based on the actual rate of flow.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising staggered and overlapping openings positioned along a path of a valve actuator. The staggered and overlapping openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

Devices and systems for exchanging properties between at least two fluid streams and related methods may include a valve device comprising a valve actuator configured to move at variable rates in order to selectively fill and empty at least one tank. Devices for exchanging properties between at least two fluid streams may include a valve device comprising staggered and overlapping openings positioned along a path of a valve actuator. The staggered and overlapping openings may be configured to selectively and gradually place an inlet in communication with at least one tank.

An elongated tank for a slurry injection system has a side wall disposed in a vertical direction and top wall. The tank further comprises an end cap coupled to the side wall comprising a slurry injection channel and defining a bottom side of the tank. The bottom side is angled downward from the side wall toward the slurring injection channel.

An elongated tank for a slurry injection system has a side wall disposed in a vertical direction and top wall. The tank further comprises an end cap coupled to the side wall comprising a slurry injection channel and defining a bottom side of the tank. The bottom side is angled downward from the side wall toward the slurring injection channel.