Abstract: Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a piston including a first cylindrical section having a first diameter and first and second annular surfaces, each of the first and second annular surfaces having a first surface area, and second cylindrical sections having a second diameter less than the first diameter, the first cylindrical section between the second cylindrical sections, and a housing including a first chamber to receive a first fluid, the first fluid to apply a first pressure on the first annular surface, a second chamber to receive a second fluid, the second fluid to apply a second pressure on the second annular surface, and a third chamber including a third fluid, the third annular surface to apply a third pressure on the third fluid, the third pressure corresponding to a difference between the first pressure and the second pressure.

Abstract: An apparatus to compress a fluid is disclosed herein. The example apparatus includes a casing, a first end plate, a second end plate, a third end plate, and a fourth end plate coupled to the casing, a first chamber and a second chamber defined in the casing between the first end plate and the second end plate, a third chamber and a fourth chamber defined in the casing between the third end plate and the fourth end plate, a first piston positioned in the casing between the first and second chambers, an air supply fluidly coupled to the first and second chambers, a second piston operatively coupled to the first piston, and a stroke end switch coupled to one of the first end plate, the second end plate, the third end plate, or the fourth end plate.

Abstract: An apparatus to compress a fluid is disclosed herein. The example apparatus includes a casing, an actuation cylinder and a compression cylinder defined in the casing, a rod slidably coupled between the actuation cylinder and the compression cylinder, and a piston coupled to the rod at an end of the rod, the end of the rod in the compression cylinder, the piston slidable relative to the compression cylinder to compress the fluid therein.

Abstract: Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a first housing including a first port, the first port fluidly coupled to a first location, first fluid to flow into the first port from the first location, a second housing coupled to the first housing, the second housing including a second port, the second port fluidly coupled to a second location, second fluid to flow into the second port from the second location, and a piston slidably disposed between the first and second housings, the first and second fluids to cause movement of the piston, the movement of the piston corresponding to a differential pressure between the first and second locations.

Abstract: Configurable fluid compression apparatus, control, and associated methods are disclosed. An example apparatus includes a compressor including a first piston in a first compression cylinder and a second piston in a second compression cylinder, a valve downstream of the first compression cylinder and upstream of the second compression cylinder, and a bypass line fluidly coupled between the valve and a location upstream of the first compression cylinder and downstream of the second compression cylinder, the valve in a first position to enable fluid to flow to the second compression cylinder, the first piston and the second piston to compress the fluid to a first pressure, and the valve in a second position to restrict the fluid from flowing to the second compression cylinder, the first piston to compress the fluid to a second pressure, the second piston to cause existing fluid to cycle through the second compression cylinder.

Abstract: An apparatus to transfer a fluid from a fluid inlet to a fluid outlet is disclosed herein. An example apparatus includes a first compressor unit and a second compressor unit fluidly coupled between the first and second locations, and a valve coupled between the first and second compressor units, the valve to switch between a first state and a second state, the fluid to flow through the first and second compressor units in a parallel configuration when the valve is in the first state, the fluid to flow through the first and second compressor units in a series configuration when the valve is in the second state.

Abstract: Differential pressure sensors, control, and associated methods are disclosed. An example apparatus includes a first housing including a first port, the first port fluidly coupled to a first location, first fluid to flow into the first port from the first location, a second housing coupled to the first housing, the second housing including a second port, the second port fluidly coupled to a second location, second fluid to flow into the second port from the second location, and a piston slidably disposed between the first and second housings, the first and second fluids to cause movement of the piston, the movement of the piston corresponding to a differential pressure between the first and second locations.

Abstract: An apparatus to compress a fluid is disclosed herein. The example apparatus includes a casing, an actuation cylinder and a compression cylinder defined in the casing, a rod slidably coupled between the actuation cylinder and the compression cylinder, and a piston coupled to the rod at an end of the rod, the end of the rod in the compression cylinder, the piston slidable relative to the compression cylinder to compress the fluid therein.

Abstract: An apparatus to transfer a fluid from a fluid inlet to a fluid outlet is disclosed herein. An example apparatus includes a first compressor unit and a second compressor unit fluidly coupled between the first and second locations, and a valve coupled between the first and second compressor units, the valve to switch between a first state and a second state, the fluid to flow through the first and second compressor units in a parallel configuration when the valve is in the first state, the fluid to flow through the first and second compressor units in a series configuration when the valve is in the second state.