Constant flow valve and cross flow control valve are variable resistance equipment, which is based on fluid differential pressure as a driving force, and according to system conditions (differential pressure) changes, automatically change the drag coefficient, to maintain the constant flow valve and cross flow through Constant flow of each branch to achieve balanced transmission and distribution of the entire system to eliminate the uneven phenomenon of hot and cold. Under the conditions of the total flow rate, the flow changes of each branch will not affect each other and the system is relatively stable. The constant flow valve and the constant flow control valve is different: constant flow valve is only a valve flap, the valve directly feel the valve before and after the differential pressure, the implementation of changes in the valve resistance action, can become a "direct acting variable resistance valve" It can not adjust the flow online, so the use of constant flow valve can not be implemented to change the total flow of energy-saving operation, and this constant flow valve is not domestic, import expensive, in the past rarely used domestic heating system, only in some central air conditioning system See. Constant flow control valve is to compensate for the way when the action of variable resistance, it has two valve, one is to adjust the valve flap for compensating the orifice before and after the differential pressure, it can become a "compensation variable resistance control valve" The principle is that the differential pressure before and after the orifice is used as the driving force for the compensation action to compensate and maintain the stability of the differential pressure before and after the orifice to keep the flow constant and to adjust the orifice size to obtain different flow rates . Therefore, it can regulate the flow. It can also keep the flow constant when the water conservancy condition changes. In the system, it can keep the flow of each branch constant and realize the balanced transmission and distribution of flow, and can also change and adjust the flow of each branch at any time to achieve the dynamic balance. If the annual cold to cold and cold to the end of the cold is carried out two flow regulation, you can achieve "phase change flow quality control" energy-saving mode of operation. Constant flow control valve adjustment is simple and convenient, but for larger systems, two times a year regulation is still a burden, but the constant flow control valve price is high, although the year can be recovered, but the user is still more psychology pressure. In summary: balance valve and constant flow control valve are optional equipment, and the general flow valve will not be considered. Balance valve is suitable for steady-state system, its advantage is lower prices, steady-state variable flow operation; drawback is the need for debugging dedicated instrumentation, high technical requirements, heavy workload, not suitable for use in the steady flow of the total annual change State system. Constant flow control valve has the advantage of easy debugging, the effect is obvious, suitable for dynamic systems. The disadvantage is that the price is higher, and there is more workload when implementing the energy-saving operation mode of "quality adjustment of flow changing in phases". It is worth mentioning that a new balanced valve that integrates the advantages of the above valve is about to come out. It does not need the instrument, the debugging is quick and easy, the work load is small and the price is lower. It is suitable for the steady state system, Welcome.
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