Ball valve for oil and gas fracturing operation

A ball valve assembly, comprising:

• a main body having a bore for transmitting fluid therethrough;
• a ball disposed within the main body and having a throughbore, the ball being rotatable within the main body for rotation between an open state and a closed state;
• first and second hydraulic equalizing valves connected to the main body above and below the ball, respectively, and configured to adjust fluid pressure above and below the ball so as to equalize the fluid pressure therebetween;
• at least one wiper disposed on a portion of the ball, wherein the at least one wiper has an edge portion being in contact with an external surface of the ball throughout rotational operations of the ball;
• and
• at least one ball seat disposed on said portion of the ball;
• and
• at least one spring holder seated on the at least one ball seat,
• wherein the at least one spring holder includes one or more cavities accommodating one or more springs and is configured to exert force on the at least one ball seat to keep the ball in position within the main body, and
• wherein the at least one wiper and the at least one ball seat do not overlap each other in a direction perpendicular to an axial direction of the bore.

A system for oil and gas fracturing, comprising:

• a wellhead assembly configured to control flow of an abrasive fluid;
• and
• a hydraulically rotatable ball valve assembly in fluid connection with the wellhead assembly and configured to remotely control a flow of fluid through the wellhead assembly,
• wherein the hydraulically rotatable ball valve assembly comprises:
• a main body having a bore for transmitting fluid therethrough;
• a ball disposed within the main body and having a throughbore, the ball being hydraulically rotatable within the main body for rotation between an open state and a closed state of the ball;
• at least one wiper disposed on a portion of the ball, wherein the at least one wiper has an edge portion being in contact with an external surface of the ball throughout rotational operations of the ball;
• and
• at least one ball seat disposed on said portion of the ball;
• and
• at least one spring holder seated on the at least one ball seat,
• wherein the at least one spring holder includes one or more cavities accommodating one or more springs and is configured to exert force on the at least one ball seat to keep the ball in position within the main body, and
• wherein the at least one wiper and the at least one ball seat do not overlap each other in a direction perpendicular to an axial direction of the bore.