A pressure pump is a type of pump that increases the pressure of a fluid or gas. Pressure pumps are used in various applications, including oil and gas operations, water systems, and manufacturing. Pressure pumps can be piston-type or diaphragm-type. Piston-type pressure pumps have a cylinder with a piston that moves up and down to create the pumping action. Diaphragm-type pressure pumps have a diaphragm that moves back and forth to create the pumping action.