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Balance valve adjustment principle
Balance valve is the scope of the control valve, it works by changing the valve core and seat gap (ie, opening), change the fluid flow resistance through the valve to achieve the purpose of regulating the flow. Counterbalance valve is equivalent to a local resistance can be changed throttling element, for the incompressible fluid flow equation can be obtained: Where: Q - the flow through the balance valve ξ - balance valve resistance coefficient P1 - the valve before Pressure P2 - valve pressure F - balance valve take over the cross-sectional area Ï - fluid density can be seen from the above formula, when F certain (that is, for a certain type of balance valve), before and after the valve pressure drop P1-P2 Variable, the flow Q only by the balance valve resistance changes. ξ increases (valve off hours), Q decreases; the other hand, ξ decreases (when the valve opens), Q increases. Balance valve is to change the opening of the valve to change the drag coefficient, to achieve the purpose of regulating the flow. Kv is the valve coefficient of the balance valve. It is defined as: when the differential valve before and after the differential pressure of 1bar (about 1kgf / cm2), flow through the balance valve flow value (m3 / h). Valve coefficient when the balance valve is fully open [1] Equivalent to the normal flow capacity of the valve. If the balance valve opening unchanged, the valve coefficient Kv unchanged, that is to say the valve coefficient Kv from the opening. Obtained by measuring the valve coefficient at different opening degrees, the balance valve can be used as a quantitative adjustment of the flow of throttle components. In the network balance debugging, with the hose will be debugged counterbalance valve small pressure valve and dedicated smart meter connection, the meter can display the value of the flow through the valve (and pressure drop value), and instrumentation man-machine dialogue , Input the flow rate value required by the balance valve to the meter, the meter calculates the opening value of the valve when the pipeline system reaches the hydraulic balance through calculation and analysis.