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Selection of self-operated differential pressure control valve
Selection of self-operated differential pressure control valve (1) Differential pressure control valve should be outside the valve network with the pressure difference matching valve outside the pipe network pressure difference, the differential pressure control valve operating characteristic curve is different. Therefore, in the design of the actual selection and network operation, should ensure that the valve installation point of the pipe, pipe network pressure within the allowable range of the valve changes. The actual pressure is too large or too small will make the spring failure, resulting in the valve does not work. (2) Selection of differential pressure control valve set pressure differential pressure control valve set pressure differential valve piping system should be designed to match the resistance to ensure that the valve in its best work area. The difference between the two will cause the actual flow of the piping system is too large, resulting in hydraulic imbalance outside the valve piping system or lead to the actual flow of the valve piping system is too small, affecting the heating effect. (3) Differential pressure control valve diameter selection Different diameter differential pressure control valve to control the flow range. In the selection of valves, should be based on the valve operating characteristics of the valve piping system design flow in the valve control flow range of the best work within the larger side of the better. Select the valve diameter is too small, so that the valve in its high-end range of flow control work, prone to noise. Select the valve diameter is too large, so that the valve in the low-end of its control flow range of work, the system flow range is too large, easily lead to hydraulic piping system imbalance, but also result in economic waste. The valve diameter of the valve than the internal pipe system interface equal or smaller diameter better. (4) Differential pressure control valve can not replace the flow control valve The purpose of the differential pressure control valve is to enable the thermal user to adjust the flow rate according to the heat requirement within a certain range. The heating system using the differential pressure control valve is a variable flow system. However, at present, most heating pipelines are determined according to the basic needs of heating. The pipe network system is actually difficult to heat on demand without any restriction and is bound to cause hydraulic imbalance in the pipe network system, especially when only the differential pressure control valve is installed Heating system installed in the heating system, the imbalance is particularly serious. There are two ways to solve this contradiction at the transitional stage from basic heating needs to on-demand heating: â‘ increase the flow of the network; â‘¡ limit the flow at the heat entrance or on the main line. The way to limit the flow is to set the flow control valve. Flow control valve optional self-flow control valve, the network can automatically balance the flow. Self-acting flow control valves are provided at each thermal inlet, which is more expensive and therefore less used. Another way is to set up a self-flow control valve branch. At present, the vast majority of thermal entrances use closed-type flow control valves, which requires that the initial adjustment work must be done manually in the early days of the commissioning of pipelines. This work is time-consuming, labor-intensive, complicated and not easy to adapt to heat network conditions Variety. However, this is an economical measure to ensure the hydraulic balance of the heating pipe network.