   As the diaphragm pump output pressure is pulsed, the pulsating pressure must be regulated to reduce the pulsation within a certain range, so as to ensure that the fluid pressure in the measurement flow stability, in order to ensure its measurement accuracy, therefore, we must design a stable Pressure device. In the pneumatic pipeline, the general use of a certain capacity of the gas chamber, the volume of fixed gas chamber, known as the constant volume gas chamber. The volume increases or decreases with the pressure increases or decreases, known as the elastic gas chamber.
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The pressure in the chamber increases with the amount of stored gas in the chamber. For different volume of gas chamber, to obtain the same pressure increment, the required gas increment is not the same. Large volume of the gas chamber smaller volume of the gas chamber required incremental large gas, it is usually also known as a large gas storage capacity of the volume, small size of the storage capacity of small.
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If the diaphragm ruptures, the high-pressure metering fluid quickly enters the hydraulic reservoir, damaging the oil seal into the gearbox of the transmission, with very serious consequences. In order to detect the rupture of the diaphragm as soon as possible and to minimize the loss, the German Lewa Company changed the diaphragm to a double diaphragm with alarm. The diaphragm is made of PTFE plastic double diaphragm, two diaphragm attached by hydraulic oil. Diaphragm sandwich with diaphragm damage detection system, if there is a diaphragm rupture, metering fluid or hydraulic oil will enter the diaphragm sandwich, so that the pressure increases, the pressure switch action, the signal sent to the central control room through the sensor, alarm.
Diaphragm changed to double diaphragm, if one of the diaphragm is damaged, the diaphragm leak detection system immediately alarm, another diaphragm can still maintain a day operation. Maintenance personnel have plenty of time to take measures to prevent mixing or leakage of hydraulic fluid with metering fluid to ensure the safety and operating life of the equipment in complex and harsh media conditions.
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