Constant flow pneumatic valve and cross flow regulating valve

constant flow pneumatic valve and cross flow regulating valve are variable resistance device, it is a differential pressure as power fluid, and according to the working condition of system ( Differential pressure) Change, automatically change the drag coefficient, maintain a constant flow pneumatic valve and transverse flow, constant through the flow of the slip road to achieve the balance of the whole system flow distribution, uneven and eliminate the phenomenon. Under the condition of traffic enough, the flow of the slip road change will not affect each other, the system is stable. Constant flow pneumatic valve and constant flow regulating valve is different: constant flow only a pneumatic valve, pneumatic valve by the pneumatic valve directly feel the pneumatic valve differential pressure before and after the change of pneumatic valve resistance action, can be a 'straight acting variable resistance pneumatic valve', it can't be online regulate traffic, so using constant flow pneumatic valve can not be implemented change traffic running, and the constant flow pneumatic valve domestic no, import price is expensive, the heating system in domestic rarely used, only seen in some central air conditioning system. Constant flow regulating pneumatic valve is compensation mode: the resistance movement, it will have two pneumatic valve, pneumatic disc, one is to adjust for compensation before and after the orifice differential pressure, thus can become 'compensating resistance regulation pneumatic valve' the principle is: use before and after the orifice differential pressure, the driving force of the action as a compensation, compensation and keep the stability of throttle orifice differential pressure before and after, so as to maintain a constant flow rate, adjusting the size of the orifice is different flow rate can be obtained. Therefore, it can adjust flow. Can also maintain a constant flow in system of water conservancy condition changes, it can be a constant in the system the flow of the slip road, the equilibrium distribution of traffic, also can change at any time and regulating the flow of each branch, achieve dynamic balance. If at the beginning of each year in cold to the end of the cold and cold to cold is two times, flow control, can be realized 'phase change flow quality, and the regulation of' energy saving operation mode. Constant flow simple and convenient adjustment of pneumatic valve adjustment, but for larger systems, two times every year adjustment is still a burden, and the constant flow regulating pneumatic valve price is high, although that can recover, but there are still great psychological pressure to the user. To sum up: balance the pneumatic valve and constant flow regulating pneumatic valve are optional equipment, flow pneumatic valve generally not be considered. Balanced pneumatic valve is suitable for the steady state system, it has the advantage of low price, can run for steady state variable flow; Defect is the need for dedicated instrument for debugging, high technical requirements, the workload is big, not suitable for use in the steady-state system traffic changes year by year. The advantages of constant flow regulating pneumatic valve is easy to debug, obvious effect, is suitable for dynamic systems. The disadvantage is that the price is higher, in the implementation of 'quality, and the regulation of phase change flow' energy saving operation mode, there are more of work. It is worth mentioning that a kind of comprehensive advantages of the pneumatic valve pneumatic valve forthcoming new balance, it does not need to use the instrument, it is easy to debug, workload is small, the price is low, suitable for steady-state system, believe it will be welcomed by users.