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Differential pressure switch common faults and solutions 1, after temporary use. Can not be strictly closed, a large amount of internal leakage; X-type pressure switch due to internal leakage is particularly large, the pressure measurement can not be carried out.
2. The dirt in the oil will be the pressure difference switch and the pressure orifice of the pressure gauge (usually φ0.8 ~ 1.0mm jam. The pressure gauge pointer will produce a large jump, dull phenomenon, affecting the accuracy of the measurement value. Detachable pressure gauge for cleaning, use φ 0.5mm steel and pay attention to the cleanliness of the oil, wire through the orifice, the pressure of each measurement point is sealed by the gap, when the valve core and the valve body hole with a larger gap.
3, pressure switch using rotary valve type. Or with the groove on the surface, when measuring the pressure, there will be no serious phenomenon of each series of cavity, resulting in inaccurate pressure measurement. At this time, if the valve core is brushed or re-aligned, the valve hole should be ground. Make sure the fit clearance is in the range of 0007~0.015mm.
4. To adjust the damper (the front end of the valve plug is conical throttling) when the adjustment is too large. Can cause the gauge pointer to swing, the measured pressure value is not accurate, and the watch moves slowly. In this case, the damper opening should be adjusted appropriately. The cone can be corrected on the cylindrical grinding machine to repair the tapered surface.
5. The position of the pressure gauge is not correct. I have found that someone has installed a pressure gauge at the remote control hole of the relief valve. There is residual air in the Bourdon tube of the gauge. The pressure jump of the gauge is inevitable. The phenomenon of pressure gauge disappeared immediately. Refit in other places where the pump pressure can be measured.
6, differential pressure switch due to the valve core and valve hole with a large gap or seal and wear pits. It also causes a large amount of pressure oil to be drained to the oil discharge port, so that the pressure measured by the pressure gauge is different from the actual pressure value of the actual measurement point, and it is not even possible to perform multi-point measurement. At this point reconfigure the valve plug or replace the pressure switch. Measuring at several points is a stress.
7. The differential pressure switch positioning steel ball is not ejected. When the valve core is rotated, the rotated position does not allow the oil hole of the pressure point to be measured, so that the oil at the pressure measurement point cannot enter the pressure through the straight groove on the valve core. In the table, the pressure test will not be allowed.
8. When the spool is turned into the second pressure measuring point, the measured pressure is inaccurate. The pressure switch should be used correctly as described above.
Differential pressure switch common faults and solutions
The differential pressure switch uses the pressure difference between the two pipes to send an electric signal. When the pressure difference between the two ends of the series pipe rises (or falls) and exceeds the set value of the controller, a signal is sent to control the commutation valve to reverse or monitor. Lubrication system. The valve is then opened large (or closed), so that the pressure difference between the two ends of the system liquid tube is reduced to achieve the normal operation of the system.