Differential pressure control valve, without any external energy, rely on the media itself is subject to pressure changes automatically adjust automatically eliminate the remaining pressure head of the pipe network and pressure fluctuations caused by changes in flow, constant user import and export pressure, especially for household Metering or automatic control system helps to stabilize the system.
(1) Differential pressure control valve should be matched with the pressure difference outside the pipe network
Valve outside the pipe network pressure difference, 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) differential pressure control valve to set the pressure difference
Differential pressure control valve set pressure differential valve piping system should be designed to match the resistance under flow to ensure that the valve work in its best working 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) 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) pressure control valve can not replace the flow control valve
The purpose of using the differential pressure control valve is to allow 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. At present, there are two ways to solve this contradiction in the transitional phase of meeting the needs of basic heating to on-demand heating:
① increase the network traffic.
② at the entrance to the heat or in the branch line restrictions on traffic. 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. But this is an economical measure to ensure that the heating pipe network is hydraulically balanced.
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