Application schemes of differential pressure controllers

Controllers that close when the pressure differential increases

In heating and cooling systems with a dynamic hydraulic mode - on branches (risers, horizontal branches), differential pressure controllers prevent the impact of hydraulic fluctuations in the system on the branches. They prevent noise formation at the control valves under high throttling pressure. Differential pressure controllers allow for optimized regulation, enhancing the 'authority' of control valves.

Differential pressure controllers installed before control valves help avoid noise caused by high pressure losses on the valve and optimize regulation by enhancing the 'authority' of the control valve. By connecting impulse tubes before and after the control valve, the differential pressure controller helps to maintain the calculated flow rate and prevents it from exceeding the limit.

Controllers that open when the pressure differential increases

In systems with significant fluctuations in the heat carrier flow rate, a differential pressure controller that opens as the differential increases is installed on the bypass line near the circulation pump. When the system flow rate decreases, the flow through the pump also decreases, increasing the differential between the suction and discharge ports. The controller responds to the increased differential pressure by opening and bypassing the heat carrier from the discharge port to the suction port to maintain a constant flow through the pump.

In the bridge between the supply and return pipelines in the piping of a non-condensing boiler connected to a system with a dynamic hydraulic mode, a differential pressure controller is required to create optimal boiler operating conditions. When the flow rate decreases, the pump head in the system increases, as does the differential between the supply and return pipelines of the boiler. The controller responds to the increased differential by opening and bypassing hot heat carrier from the supply pipeline to the return pipeline, ensuring stable flow through the boiler regardless of system fluctuations. This differential pressure controller application scheme raises the water temperature at the boiler inlet, reducing the likelihood of condensation on the heat exchanger surface due to exhaust gases.

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