For type selection of differential pressure control valve ( 1) Differential pressure control valve should be valve valve pipe network pressure difference matching with the pipe network pressure difference, differential pressure control Industrial Valves operating characteristics curves are different. So in actual operation, design selection and pipelines shall ensure that the Industrial Valves installation position point of tube, pipe network pressure difference within the scope of the valve to allow changes. Actual pressure difference is too big or too small will all make spring failure, lead to the valve cannot work normally. ( 2) Selection of differential pressure control valve set pressure differential pressure difference control valve set pressure differential and valve in the pipeline system under the design discharge resistance matching, to ensure that the valve is in its best working area. Both are too big to actual flow pipe system in the valve is too large, resulting in valve hydraulic disorder or piping system in the pipe system in the valve flow affect heating effect is too small. ( 3) Differential pressure control valve diameter selection of different diameter of pressure difference control valve control flow range is different. When choosing the valve, the valve should be according to the working characteristic curve to get the valve valve internal piping system design flow control flow range best work area slants big side is better. Select the valve diameter is too small, make the valve in the control flow range of high-end work, easy to produce noise. Select the valve diameter is too big, make the low end of the range of the valve in the control flow work, system flow range is too big, easy cause disorder of valve hydraulic piping system, at the same time also cause economic waste. General Industrial Valves diameter pipeline system interface in the valve pipe diameter is equal or better a smaller size. ( 4) Differential pressure control valves cannot be used instead of flow control valve differential pressure control valve is designed to make heat users within a certain range according to the requirements of the heat flow adjustment, the use of differential pressure control valve of the heating system is a variable flow system. But at present most of the heating network is set according to the basic need of heating, real hard to do on-demand unlimited heating pipe network system, certainly will cause disorder of hydraulic pipe network system, especially in the installation of differential pressure control valve only and did not install the heating system of thermal table, hydraulic disorder phenomenon is particularly serious. In the current from the meet the needs of the basic heating to on-demand heating transition stage, there are two ways to solve the paradox: (1) increasing network traffic; (2) or at the entrance of the thermal limit traffic on the trunk. Limit flow method to set the flow control valve. Flow control valve, flow control valve can choose self-help type balance of pipe network can automatically flow. Self-reliance type must be set up in each thermal entrance are flow control valve, the high cost of this way, so use fewer. Another way is set up on the trunk and self-reliance type flow control valve. Currently the vast majority of thermal entrance use lock closed flow control valves, this request at the beginning of the pipe network of commissioning work, the initial adjustment must be made by artificial means time-consuming, laborious, the work is relatively complicated, difficult to adapt to the change of working condition of heat supply network. But this is a kind of economy guarantee measures of heating pipe network hydraulic balance. In this paper, the keyword search: valve product information
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