Detailed regulation of the principle of balance valve

Valve control valve belonging to the scope of the principle of its work is by changing the valve core and valve seat of the gap (that is, opening), to change the flow of fluid through the valve resistance to the purpose of regulating traffic. Valve is equivalent to a partial resistance of the cutting element can be changed on the incompressible fluid, the flow equation is available from:



Q - flow through the balance valve ξ - balance valve resistance coefficient of P1 - pressure valves before



P2 - pressure valves after F - Valve to take over the cross-sectional area ρ - fluid density



As can be seen from, when certain F (that is, the balance valve of a model), valve pressure drop before and after the P1-P2 not changed, the flow resistance of Q only by the impact of changes in balance valve. ξ increases (valve clearance-hour), Q decreases; the other hand, ξ decreases (when the valves open), Q increases. Balance valve spool is to change the opening to change the drag coefficient to achieve the purpose of regulating traffic.



Kv factor for balance valve of the valve. It is defined as: When the pressure balance valve for around 1bar (about 1kgf/cm2) when the flow of value through the balance valve (m3 / h). Balance valve of the valve coefficient of full-time equivalent capacity of the general circulation of the valve. Unchanged if the balance valve opening, the valve coefficient Kv unchanged, that is the valve coefficient Kv determined by the opening. Through measured under different valve opening coefficient, can be used as quantitative balance valve regulating the flow of expenditure components.



Balance in the pipe network debugging, the SAM will be debugging the pressure balance valve with a dedicated small valve to connect the smart meter, meter can show the value of the flow through the valve (and pressure drop values), with the instrument man-machine dialogue and input to the instrumentation required by the Department of the balance valve flow value, the instrument by calculating, analysis, come to the hydraulic pipeline system to reach the equilibrium value of the valve opening.

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