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Large-diameter electric control valve is an alternative choice

The percentage of the number of such control valve closed. This also allows smaller flow regulation. Similarly, DN400 butterfly valve adjustment (the loop of the rated flow of 900m3 / h) as an example a brief description: In order to improve control accuracy, the total flow switch valve flow 40% (360mS / h), the other with equal percentage valve. Taking into account the linear regulator, switching valves and equal percentage control valve pressure drop should be the same choice at 25kPa pressure drop, the pressure drop curves based on, switch the valve diameter of DN1O0. Flow and pressure drop according to choice, the other by three percentage DN150 valve in parallel, the pressure drop as 25kPa. Both parallel operation, when the flow is large, regulation,[link widoczny dla zalogowanych], and the percentage of accurate flow adjustment valve; when equal percentage control valve regulating flow than 500m3 / h, turn off the switch valve, control valve by the percentage of such regulation,[link widoczny dla zalogowanych], according to traffic changes , regulation, and the percentage of the number of control valve closed. This also allows smaller flow regulation. Drop to less than 30kPa above subject, if the pressure drop and then take small, the need to increase the number of valves in parallel, in this not repeat them here. 4 Conclusion modulating valve regulator of linear features that make its poor performance. The use of multiple parallel or equal percentage control valve switching valve equal percentage control valve with a number of alternatives in parallel, can solve the problem of poor performance of its regulation is technically feasible solution. References: 【1] Shijun Liang valve choice [M】. Beijing: China Building Industry Press, 1986. 【2J2Robert · Petitjean, and so on. Overall balance of water pipe network technology 『M】. Lang Siwei, Feng iron bolt (translation). Beijing: China Building Industry Press, 1991. Received :2009-1O-12 Revised :2009-1O a 15AnAlternativeMethodforChoosingLargeCaliberAdjustingValveHULing-ling,[link widoczny dla zalogowanych], QINRuo-si (J. Hangzhou ashamed Air-conditioningSvtemEngineeringCo., Lid, Hnagzhou310013, China; 2.McquayAirConditioning (S ∞) Co., Ltd, Shanghai200072, China) Abstract: Normally, thediameterofequalpercentageadjustingvalveisquitesmal1. Whenabigadjustingvalveisrequiredinaproject,[link widoczny dla zalogowanych], theadjustingbutterflyvalvecanbefullyinplaceoftheequalpercentageadjustingvalve. However, thebutterflyvalve'scontrolperformanceispoorwithdramaticvibration. Soitisntapplicableonoccasionsneedstablelycontrolledtemperature. Inrealitytheon-offbutterflyvalveworkswithasmalladjustingvalvecouldachieveaccuratetemperaturecontro1. Thisarticleintroducedtheregulatingcharacteristicsofvalvesanddeeplyanalysedtheapplicationofthecombinedvalvesinvariouscases. Keywords: adjustingbutterflyvalve; modelselection; alternativemethod Author: Hu Lingling (1971 a), female, Zhejiang Shaoxing, Bachelor of Engineering,[link widoczny dla zalogowanych], engineers, engaged in the HVAC design; Qinruo Si (1971 A), female, Shanghai, Bachelor of Engineering, engineers, engaged in Design of HVAC and refrigeration section 130I49 total of 30 of the total volume _ the first leaf of the

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