The plunger type pressure gauge is composed of plunger, balance spring, pointer and dial. The plunger is connected with the system pressure, and the calibration unit of the dial is psi (bar).

Working principle of plunger gear pump pressure gauge: when the system pressure rises, the pressure acts on the piston to overcome the balance force of the spring and push the piston to move, which makes the pointer connected with the piston indicate the corresponding pressure value on the dial. The measuring system of plunger pressure gauge is economical and durable