Differential pressure controllers are commonly used for the pressure difference between a freezer system, a balanced sump, and a water separator. After the MPDM floating point action of the differential pressure controller is connected with the contact point, the bypass valve is operated to open and close to achieve the balance of the supply and return pressure difference. When the pressure difference of the system exceeds the set value of the controller, the valve is then opened and more water is diverted through the bypass valve, thereby reducing the pressure difference between the supply and return water of the system. Also suitable for gas or liquid pressure differential applications. The differential pressure controller is a protection device for preventing the refrigeration compressor from damaging the bearing pad due to insufficient pressure of the lubricating oil.
The differential pressure controller is a differential pressure comparator, and the differential pressure is selected to be the resistance of the controlled heating system. The spring reaction force in the return side of the differential pressure controller is used to balance the pressure difference between the water supply and the return water. When the differential pressure controller is controlled by some users of the heating system to increase or decrease the room temperature adjustment resistance, the amount of circulating water will be caused until the pressure of the pressure difference controller diaphragm is balanced by the spring. The position of the dual-channel automatic regulator of the differential pressure controller is also newly determined, so that the pressure difference between the supply and return water of the controlled system is basically unchanged. Differential pressure control is difficult to achieve, especially in biosafety laboratories. To obtain and maintain accurate, stable pressure differentials is definitely a challenging task for control engineers. Therefore, when designing the differential pressure control system, it must be analyzed and determined based on the actual situation from the following aspects: 1 risk analysis and assessment; 2 constant air volume system and variable air volume system selection; 3 differential pressure control and residual air volume control methods; 4 Influence of control signals and noise; 5 system stability and response speed; 6 Influence of building structure on pressure difference control; 7 Influence of duct leakage on pressure control.
The differential pressure controller uses a diaphragm-piston combination sensing, suitable for differential pressures from low to high, different static pressures in hydrodynamic or process applications, and cycle rates for over-range pulse pressures or ranges. Can be used for air, gas, oil, water and other non-corrosive media. The differential pressure controller housing cover is equipped with a test push button, the reliability of the test delay mechanism, when the refrigeration compressor is running, will push or push the direction of the arrow, the push time must be greater than the delay time, after a certain delay After time, if you can cut off the motor power, it means that the delay mechanism can work normally.
The differential pressure controller works on the basis of two opposing pressure-sensitive elements (bellows). The force produced by the difference between two different pressures is balanced by the spring if it is less than the set value. Due to the effect of the lever, the switch turns on the electric heater in the delay mechanism, delays the switch within a certain time delay (approximately 60 seconds), cuts off the motor power, stops the compressor, and stops the heater. heating. A manual reset device is installed in the time delay mechanism of the controller. When the compressor is stopped due to the oil pressure cannot be established, the controller cannot automatically reset after the action. After the fault is cleared, press the reset button again to enable the delay mechanism. The delay switch turns on the motor power to start the compressor.
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