steam pressure reducing valve is mainly fixed outlet pressure control of the main valve. The main valve outlet pressure does not change with the change of inlet pressure and, not because of the change of the main valve outlet flow pressure to change its exports. This invention is to improve the system running status and the function of the water saving potential. According to statistics, water-saving effect is about 30%. Applicable to the industrial water supply, fire water supply, water pipe network system. Steam pressure reducing valve is widely used in high-rise buildings, high pressure region, urban water supply network, mining and other occasions, to ensure that each water point of water supply system can obtain the use of suitable water pressure and flow rate. Steam pressure reducing valve used to control the opening and closing of the valve body part of the opening to regulate the flow of medium, reduce the pressure of medium, and with the aid of the valve pressure regulation after the open part of the opening, to keep the valve after pressure in a certain range, under the condition of the inlet pressure changing, keep the outlet pressure within the scope of the set, in order to ensure the daily production equipment of the later.

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