Fluid delivery device for a hydraulic fracturing system

A fluid delivery device for a hydraulic fracturing system, said fluid delivery device comprising:

• a fluid conduit comprising a fracking fluid outlet configured to be fluidly connected to a well head for delivering a fracking fluid to the well head, the fluid conduit comprising a base fluid inlet configured to be fluidly connected to an outlet of a frac pump of the hydraulic fracturing system;
• a syringe having a material chamber fluidly connected to the fluid conduit downstream from the frac pump, the material chamber being configured to be fluidly connected to a material source, the syringe comprising a base fluid chamber, the syringe comprising a piston that is configured to retract to draw at least one material of the fracking fluid into the material chamber from the material source, the piston being configured to extend to push the at least one material of the fracking fluid from the material chamber into the fluid conduit;
• and
• a diverter fluidly connected to the base fluid chamber and moveable between first and second positions, wherein the first position of the diverter is configured to fluidly connect the base fluid chamber to a base fluid reservoir of the hydraulic fracturing system and fluidly disconnect the base fluid chamber from the outlet of the frac pump, and wherein the second position of the diverter is configured to fluidly connect the base fluid chamber to the outlet of the frac pump and fluidly disconnect the base fluid chamber from the base fluid reservoir.

A method for operating a syringe of a hydraulic fracturing system, the method comprising:

• fluidly connecting a base fluid chamber of the syringe with a base fluid reservoir to draw at least one material of a fracking fluid into a material chamber of the syringe, wherein fluidly connecting the base fluid chamber of the syringe with the base fluid reservoir comprises moving a diverter to a first position wherein a first valve of the diverter is open and a second valve of the diverter is closed;
• fluidly connecting the base fluid chamber of the syringe with an outlet of a frac pump of the hydraulic fracturing system to approximately equalize the pressure within the base fluid chamber and the material chamber, wherein fluidly connecting the base fluid chamber of the syringe with the outlet of the frac pump comprises moving the diverter to a second position wherein the second valve is open and the first valve is closed;
• and
• actuating the syringe to inject the at least one material from the material chamber into a fluid conduit when the base fluid chamber of the syringe is fluidly connected to the outlet of the frac pump.