Valve monitoring system for a bellows pump

A pump configured to introduce treatment fluid into a well, comprising:

• a power end;
• a fluid end having a fluid end housing with a chamber, a suction valve, and a discharge valve;
• an expandable bellows in fluid communication with the power end;
• one or more strain gauge configured to measure strain in the pump;
• and
• a control system configured to receive data from the one or more strain gauge and to monitor for valve health, wherein the one or more strain gauge is disposed on the fluid end and/or the power end, the pump further comprising one or more position sensor, wherein the controller is configured to correlate data from the one or more position sensor with data from the one or more strain gauge, wherein the power end comprises a piston disposed in a bore, wherein the one or more position sensor comprises two position sensors, wherein a first of the two position sensors is configured to detect position of the bellows and a second of the two position sensors is configured to detect position of the piston, and wherein a difference between position of the bellows and position of the piston is monitored by the control system using data from the two position sensors to determine whether the bellows is in sync with the piston.