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Danfoss Heating - Page 2
Data sheet Description / Application (continuous) Automatic balancing valves ASV ASV balancing valves are designed to guarantee high quality of the automatic balancing by: - a pressure released cone, - an adapted membrane for every valve dimension which provide constant quality performance for all sizes, - spring with linear characteristic that makes setting required Δp easy. A 90° angle between all service features (shutoff, draining, setting, measuring) allows an easy access under any installing condition. All the above-mentioned features and functions are realized in small build-in dimensions so it is easy to install ASV even in very limited space. ASV valves are performing pressure control not only at design conditions (100 % load) but also at all partial loads (thus fulfilling the requirements of DIN 18380 norms). By controlling pressure at a partial load one can prevent noise problems on thermostatic radiator valves which often occur in unbalanced systems. ASV valves (DN 15-40) are packaged in styropore (EPS) which can be used for insulation at temperatures up to 80 °C. An insulation cap is available as an accessory for insulation at higher temperatures (up to 120 °C). ASV valves in dimensions DN 15-40 are supplied with an internal or external thread while DN 50 is supplied with external thread only. If an external thread is chosen, a threaded or weld nipple can be supplied as an accessory. Dimensions DN 65-100 are supplied as f langed valves. ASV balancing valves have integrated service functions such as shut-off and draining. ASV-PV can be equipped with nipple for f low measuring. In that case measuring nipples need to be ordered separately and mounted on the valve as follows: • on top of drain cock (DN 15-50), • on the f lange connection before the valve is filled with water (DN 65-100). ASV-PV valves are to be mounted in return pipe, in combination with partner valves mounted in f low pipe. As a partner valve ASV-M/I/BD are recommended for dimensions DN 15 to DN 50 and MSV-F2 for dimensions DN 65 to DN 100. There are two basic configurations when using ASV partner valves (ASV-BD, ASV-I, ASV-M, MSV-F2): - partner valve outside the control loop (Fig. 1). Recommended configuration: it results in best performance since whole controlled pressure range is available to the riser. Flow limitation is done on each terminal unit in the riser (for example, RA-N with presetting on radiator, etc). DN 15 to DN 50: ASV-M or ASV-BD DN 65 to DN 100: MSV-F2, by connecting impulse tube to down-flow measuring nipple. - partner valve inside control loop (Fig. 2). Offers flow limitation on the riser however part of the controlled pressure range is used by pressure drop on partner valve (∆pi). It is recommended when flow limitation on each terminal units is not possible. DN 15 to DN 50: ASV-I or ASV-BD. DN 65 to DN 100: MSV-F2, by connecting impulse tube to up-flow measuring nipple. Fig.1 SettingofASV-PV=Δpriser Fig.2 SettingofASV-PV=∆priser+∆pi ASV-BD can be used outside or inside control loop by choice of which measuring nipple is open. To be used outside control loop, blue measuring nipple needs to be open. In this position, flow verification can be done (default position). To be used inside control loop, red measuring nipple needs to be open. In this position, flow verification & flow verification can be done. 2 VD.A6.E1.02 © Danfoss 06/2012 DEN-SMT/SI