Balance valve is a valve with special functions. It has good flow characteristics, valve opening indication, opening locking device and a small pressure measuring valve for flow measurement. The balance valve is a valve for dynamic and static balance adjustment under hydraulic conditions. Such as: static balance valve, dynamic balance valve. Static balance valve is also called balance valve, two-position control valve, etc. It changes the flow resistance through the valve by changing the gap (opening) between the valve core and the valve seat to achieve the purpose of adjusting the flow rate. Its object is the system The resistance of the new water can be balanced according to the proportion calculated by the design, and each branch will increase or decrease in proportion at the same time, which still meets the flow demand of the partial load under the current climate demand and plays a role in heat balance. Classification and working principle Static balance valve: Static balance valve is also known as manual balance valve or manual control valve. It is a valve that can measure and adjust the flow rate. Its operation mode is manual manual adjustment.
The principle of the balance valve is an orifice plate with variable flow rate, and it has a related breaking function. By measuring the pressure drop of the measuring holes before and after the valve, combined with the reading of the valve opening, the adjusted flow rate of the valve can be calculated. The static balance valve is essentially a damping adjustment element with a clear "flow-pressure difference-opening" relationship, clear and adjustable opening indication and good adjustment characteristics. Dynamic flow balancing valve: Dynamic flow balancing valve, also known as self-operated flow control valve, constant flow balancing valve, etc., is a valve that can automatically keep the flow of the pipeline constant within a certain pressure difference range before and after the valve body. Its working principle is to adapt to the change of pressure difference before and after the valve by changing the flow area of ​​the spool of the balance valve, so as to achieve the purpose of controlling the flow. That is, no matter how the inlet flow of the valve changes within a certain pressure difference range, the outlet flow can be guaranteed to be constant.
It is equivalent to a throttling element with variable local resistance. The element is composed of a valve liner with a variable flow area, a high-precision (±5%) spring and a supporting device. The pressure difference of the spring automatically controls the size of the flow area on the valve liner, so that the flow rate through the valve is constant. The size of the flow value can be customized according to system requirements. Dynamic pressure difference control valve: Dynamic pressure difference control valve is also called self-operated pressure difference control valve, constant pressure difference valve, dynamic pressure difference balance valve, etc. Its working principle: its valve body can set the pressure difference value, by adjusting the valve itself The opening degree can automatically keep the pressure difference between the two key points of the system constant at the set pressure difference value. The dynamic differential pressure control valve is designed based on the spring-diaphragm combination method. Dynamic balance electric two-way switch valve: It has dynamic balance and electric switch functions. When the valve is opened, it can dynamically keep the actual flow of the pipeline constant at the design flow value, and is not affected by system pressure fluctuations.
Combined or integrated dynamic balance electric control valve: It combines the dynamic pressure balance valve and the electric control valve. The integrated dynamic balance electric control valve integrates the dynamic pressure balance valve and the electric control valve into one valve body. It not only has a dynamic balance function, that is, it can dynamically balance the pressure fluctuations of the system, so that the flow through the pipeline is not affected by the system pressure fluctuations, but also has an electric adjustment function, that is, it can automatically adjust the opening according to the load changes in the target area. Thereby adjusting the flow value to ensure that the temperature of the target area is always constant at the set temperature. Note: 1. Since one cycle is a constant flow and constant frequency system, the check valve here has a larger caliber, often above DN300, and a quick-closing check valve should be used: such as CVRS-silent check valve for rolling shutters Or CVKR-Large-caliber short-body silent check valve.
If a manual control valve (also called a static balance valve) is installed at this time, there should be no need to install a dynamic balance valve. 2. If the water pump outlet check valve is not equipped with a manual regulating valve, a dynamic balance valve must be installed to protect the water pump and the main engine and ensure that it runs under the rated flow conditions. 3. A fixed flow multifunctional valve can also be used to replace check valves and flow regulating valves, which is a better solution. At the same time save space. 4. Installing a hydraulically controlled slow-closing check valve or multi-function valve here is a bad application for the design institute. It can neither achieve its function better, but also bring too much hydraulic loss. Should be strongly rejected. 5. At the cooling tower, it is strongly recommended that the design institute use electric butterfly valves. If the cooling towers cannot be closed at the same time as the number of hosts are closed, energy will be wasted and the cooling efficiency will be reduced. The use of dynamic balance valves will also better improve cooling. efficient.
6. If there are control requirements for the main engine and water pump, the differential pressure bypass valve should adopt an electronic differential pressure controller. (The electric adjustable butterfly valve is used for the diameter of 200 or more, which can realize the function, and the installation space is small, and at the same time it is cheap.)