Operation of a recirculation circuit for a fluid pump of a hydraulic fracturing system

A control system, comprising:

• a fluid conduit configured to direct fluid discharged from a fluid pump;
• a shutoff valve in the fluid conduit;
• a throttling valve in the fluid conduit;
• and
• a controller configured to:
• cause, while the shutoff valve is closed, actuation of the throttling valve to an open position;
• obtain first information indicating a first pressure of the fluid in the fluid conduit at a first side of the throttling valve between the throttling valve and the shutoff valve and second information indicating a second pressure of the fluid in the fluid conduit at a second side of the throttling valve;
• and
• transmit a signal to indicate that the shutoff valve has a leak based on the first pressure being different from the second pressure.

A method, comprising:

• causing, by a controller, closing of a shutoff valve in a fluid conduit configured to direct fluid discharged from a fluid pump;
• causing, by the controller, actuation of a throttling valve in the fluid conduit to a partially open position;
• obtaining, by the controller via communication with respective first and second pressure sensors associated with the fluid conduit, first information indicating a first pressure of the fluid in the fluid conduit at a first side of the throttling valve between the throttling valve and the shutoff valve and second information indicating a second pressure of the fluid in the fluid conduit at a second side of the throttling valve;
• determining, by the controller, whether the first pressure is different from the second pressure,
• wherein the first pressure being different from the second pressure is indicative of a leak in the shutoff valve;
• and
• performing one or more actions based on a determination that the first pressure is different from the second pressure.