Pilot Diaphragm Steam Regulators DP17, DN27, 25P occupy an important position in steam systems due to their excellent performance. The new diaphragm material used in this pressure reducing valve not only enhances durability but also increases the working area to optimize steam flow control. It maintains a stable and accurate pressure output regardless of fluctuations in upstream vapor pressure or changes in downstream loads.
It is unique in that it can be installed on the same body or interchange one or more pilot valves, providing a multi-functional integration. In addition to stable pressure reduction, it also provides a comprehensive solution for steam systems such as temperature control, upstream pressure control or remote on/off control.
In principle, the pilot diaphragm steam pressure reducing valve has the main valve closed and the pilot valve kept open by spring force before starting. Steam flows into the main diaphragm chamber through the pilot valve, while some steam flows out of the control hole. As the steam flow changes, the control pressure in the main diaphragm chamber will also be adjusted accordingly, so as to accurately control the opening of the main valve and achieve a stable output of steam flow.
During the selection process, we had to consider the flow rate of the steam after passing through the pressure reducing valve. In order to avoid excessive noise and erosion, the steam flow rate needs to be effectively controlled. In general, it is recommended to limit the steam flow rate in heating systems to between 20 and 30 ms. Outdoors or in noisy environments, the flow rate can be increased appropriately.
For example, in a steam heating system, the inlet pressure is 7 barg, the outlet pressure is 2 barg, and the flow rate is 440 kg h. According to the selection principle, we can choose the configuration scheme with the upstream pipe diameter of DN40 and the downstream pipe diameter of DN65 to ensure that the steam flow rate is within a reasonable range, and at the same time meet the pressure and flow requirements of the system. This configuration not only ensures the stable operation of the steam system, but also effectively extends the service life of the pressure reducing valve.