Differential pressure gauges are suitable for measuring small differential pressures between two high pressures in industrial process control. Its structure is a double bellows structure, that is, two bellows are installed in symmetrical positions on both sides of the "I" shaped bracket. The upper and lower ends of the I-shaped bracket are respectively the movable end and the fixed end, and the middle is connected by a spring piece; The two bellows are connected to the low-pressure joints on the case, and the gearing mechanism is mounted directly on the fixed end of the bracket. And is connected with the movable end of the support by pull rod; The dial is fixed directly to the gear drive. When the upper and lower ends receive different pressures (generally the high-pressure end is higher than the low-pressure end), the force of the two bellows acting on the movable support is not equal, so that the displacement generated separately drives the gear transmission mechanism to drive and amplify, and the differential pressure value indicated after the pointer is deflected.
