Automatic balancing valves ASV

Transcription

1 Automatic balancing valves ASV ASV-PV ASV-PV ASV-PV ASV-BD ASV-M DN DN 50 DN DN DN Description / Application ASV balancing valves are used for dynamic hydronic balance in heating and cooling systems. Dynamic balancing means: permanent balancing from 0 to 100 % load by controlling the pressure in systems with variable f low. At partial loads, when the f low is decreased by the control valve, pressure limitation is still performed and consequently dynamic balancing is also performed. By using ASV you avoid using complex and time consuming commissioning methods. Dynamic balancing of the system in all loads helps you to save energy and improves climate comfort and control. F low limitation By using a combination of an ASV pressure controller and the terminal s settable unit valve, f low limitation is established. F low limitation for each terminal unit prevents underf lows on distant units and overf lows on others thus allowing efficient pumping. Lower noise emission Differential pressure limitation ensures the pressure over the control valve does not increase at partial loads thus noise emission will be lower. (This is the reason why DIN requires control of differential pressure by partial load.) No balancing method needed F low limitation is achieved by adjusting each hydronic loop separately without inf luencing others, which consequently results in a one time adjusting process. No special balancing method is needed so commisioning costs can be saved. Control valve authority Controlling differential pressure over the control valve means that authority is high which allows an accurate and stable control as well as energy saving. Zone balancing By installing the ASV sets you can divide the piping system into pressure independent zones. This allows a gradual connection of zones to the main system in new constructions or without the need for an additional balancing method when rennovating. There is no need for re-commissioning every time the system is changed because the hydronic balancing is done automatically. ASV-PV valves are settable in different ranges: 5-25 kpa setting is mostly used for radiator application, kpa or kpa setting is used for floor heating, fan coil, chilled beam and f lat station applications, kpa setting is used for f lat station and fan coil, chilled beam application, kpa setting is used for large terminal unit applications (air handling units, fan coils, etc.). By using ASV valves it is possible to optimize the pump head while independent pressure zones allow the authority of the terminal unit s valve to be kept high. SMT/SI VD.A6.E4.12 Danfoss 12/2014 1

2 Description / Application (continuous) ASV balancing valves are designed to guarantee a high quality of automatic balancing by: - a pressure released cone, - an adapted membrane for every valve dimension which provides constant quality performance for all sizes, - spring with linear characteristic that makes setting the required Δp easy. A 90 angle between all service features (shutoff, draining, setting, measuring) allows for easy access under any installation condition. All the above-mentioned features and functions are realized in small built-in dimensions so it is easy to install the 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 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 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 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 a nipple for f low measuring. If required measuring nipples can be ordered separately as an accessory 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 ). ASV-PV valves should be mounted in the return pipe, in combination with partner valves mounted in f low pipe. As a partner valve ASV-M/ 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-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 the 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 the partner valve ( p i). This is recommended when flow limitation on each terminal unit is not possible. DN 15 to DN 50: ASV-BD. DN 65 to DN 100: MSV-F2, by connecting the impulse tube to up-flow measuring nipple. Fig. 1 Setting of ASV-PV = Δp riser Fig. 2 Setting of ASV-PV = p riser + p i ASV-BD can be used outside or inside the control loop by choice of which measuring nipple is open. To be used outside the control loop, the blue measuring nipple needs to be open. In this position, flow verification can be made (default position). To be used inside the control loop, the red measuring nipple needs to be open. In this position, flow limitation & flow verification can be made. 2 VD.A6.E4.12 Danfoss 12/2014 SMT/SI

3 Description / Application (continuous) Fig. 3 ASV in riser / typical heating application (general example) ASV valves can be used in radiator heating systems to control the differential pressure in risers. To limit the f low for every radiator, the thermostatic radiator valve with pre-setting facilities (feature) is used together with a constant pressure provided by the ASV, thus providing balanced heat distribution. Alternatively the f low in the riser can be limited by using the setting function of the ASV-BD. Controlling differential pressure over the riser means also that the valve authority over the thermostatic radiator valves is high which allows an accurate and stable temperature control and saves energy. Fig. 4 ASV in manifold for f loor heating system ASV valves can also be used in f loor heating systems. To limit the f low for every loop, valves with an integrated f low limiting or pre-setting function should be used together with a constant pressure provided by an ASV-PV valve. Alternatively the f low for the whole manifold can be limited by using the setting function of the ASV-BD. ASV-PV valves can control the differential pressure in several ranges if different pressure is needed. Due to their small dimensions the ASV automatic balancing valves are easy to install in a wall mounted box for f loor heating manifolds. SMT/SI VD.A6.E4.12 Danfoss 12/2014 3

4 Description / Application (continuous) Fig. 5 ASV with fan coil The ASV valves are suitable for use in systems with fan coils, induction devices and air-heaters to secure an automatic hydronic balance by means of differential pressure control in branches or at every coil. Constant differential pressure in combination with pre-set control valves i.e. ASV- BD limits the f low. Fig. 6 F lat station ASV automatic balancing valves can also be used in other applications. For example ASV can be used to prevent noise problems at the thermostatic radiator valves in small systems by controlling the differential pressure. ASV can be used in every application you need a small differential pressure controller, e.g. small f loor manifolds or f lat stations. In buildings equipped with f lat stations ASV valves can be used to provide secure automatic balance by means of differential pressure control in risers/zones. In f lat stations, pressure conditions change when sanitary water heating is taking place in comaparison to the situation when only heating is needed. By using ASV-PV valves the differential pressure is also controlled in these instances. Constant differential pressure in combination with pre-set control valves i.e. ASV-BD limits the f low. 4 VD.A6.E4.12 Danfoss 12/2014 SMT/SI

5 Sizing Thread F lange Q min Q Q 10 kpa Fig. 7 Column diagram for sizing ASV valves at p v = 10 kpa. For different p v values use diagram A and B in Appendix A. We recommend sizing the diameter of ASV-PV valves by using Fig 7. Maximum f low rates are based on 10 kpa differential pressure over the valve which allows effcient pumping and saves energy. After ASV-PV valves have been sized the same dimension of partner valve (ASV-BD / ASV-M / MSV-F2) should be selected. Example: Given: Pipe f low 200 l/h, pipes DN 15 Connection between valve size and pipe size K v values for each dimension were designed to cover a f low range according to VDI 2073 with water velocity of up to 0.8 m/s, at a differential pressure of 10 kpa over the valve. As long as the water velocity in the pipe is between 0.3 and 0.8 m/s, the dimension of the valve should be equal to the pipe dimension. This rule is derived out of the fact that K v values for each dimension have been designed to cover f the low range according to VDI 2073 at a differential pressure of 10 kpa over the valve. Solution: The horizontal line intersects the column for the valve DN 15 which can therefore be selected as the required size. For detailed sizing see examples on pages 14 and 15. For different p v (differential pressure over the valve) see diagrams in Appendix A. SMT/SI VD.A6.E4.12 Danfoss 12/2014 5

6 Ordering ASV-PV balancing valve, includes in the box: 1.5 m impulse tube (G 1/16 A) and drain cock (G 3/4 A) Type DN 15 1,6 k VS p setting range Connection (m 3 /h) (kpa) R p 1/2 Code No. 003L ,5 R p 3/4 003L ,0 R p L ,3 R p 11/4 003L ,0 R p 11/2 003L ,6 Internal thread R p 1/2 003L ,5 ISO 7/1 R p 3/4 003L ,0 R p L ,3 R p 11/4 003L ,0 R p 11/2 003L ,3 R p 11/4 003L ,0 R p 11/2 003L ,6 G 3/4 A 003L ,5 G 1 A 003L ,0 G 11/4 A L ,3 G 11/2 A 003L ,0 External thread ISO 228/1 G 13/4 A 003L ,5 G 1 A 003L ,0 G 11/4 A 003L ,3 G 11/2 A 003L ,0 G 13/4 A 003L ASV-PV balancing valve, inclusive in the box: 2,5 m impulse tube (G 1/16 A) drain cock (G 3/4 A) and adapter 003L Type DN k VS p setting range Connection (m 3 /h) (kpa) External thread ISO 228/1 G 2 1/2 Code No Z Z Z Z ASV-PV balancing valve, inclusive in the box: 2,5 m impulse tube (G 1/16 A), adapter ASV large 003Z and 003L Type DN k VS p setting range Connection (m 3 /h) (kpa) Code No. 003Z Z ,0 003Z Z F lange EN Z ,0 003Z Z Z ,0 003Z VD.A6.E4.12 Danfoss 12/2014 SMT/SI

7 Ordering (continued) ASV-BD shut-off valve, multifunctional partner valve (shut-off, rotating measuring station) Type DN k VS Internal thread (m 3 /h) (ISO 7/1) Code No. 15 3,0 R p ½ 003Z ,0 R p ¾ 003Z ,5 R p 1 003Z R p 1¼ 003Z R p 1½ 003Z R p 2 003Z ASV-M shut-off valve, without measuring nipples Type DN k VS Internal thread External thread Code No. Type (m 3 /h) (ISO 7/1) (ISO 228/1) Code No. 15 1,6 R p ½ 003L ,5 R p ¾ 003L ,0 R p 1 003L ,3 R p 1¼ 003L R p 1½ 003L G 2¼ A 003L Accessories and spare parts Description Comments/connection Code No. Differential pressure measuring connector For drain cock 003L Drain cock For ASV-PV (DN 15-50) 003L Two measuring nipples and one locking plate For ASV-I and ASV-M, rectus type 003L mm measuring nipples, 2 pcs For ASV-BD 4) 003Z Operating handle For ASV-BD 4) 003Z Impulse tube, with O-rings 1.5 m 003L m 003Z m 003L Adapter large ASV 1) G ¼-R ¼; G 1/16 003Z Nipple for connecting impulse tube 2) G 1 16-R ¼ 003L O-ring for impulse tube 3) L Plug for impulse tube connection ASV-M 3) G 1 16 A 003L ) Recommended for use with MSV-F2, connected to measuring hole, it allows connection of impulse tube from ASV while retaining measurement functionality. 2) Recommended for use with MSV-F2, connected to measuring hole. Can also be used for connecting impulse tube directly on the pipe. 3) Set of 10 pieces. 4) for complete range of ASV-BD accessories please refer to MSV-BD datasheet. SMT/SI VD.A6.E4.12 Danfoss 12/2014 7

8 Technical data Type ASV-M/PV ASV-BD Nominal diameter DN Max. pressure 16 (PN 16) 20 bar Test pressure Differential pressure over the valve kpa ) ) Temperature C Material of parts in contact with water Valve body Brass Grey cast iron EN-GJL-250 (GG 25) Cone (ASV-PV) DZR brass Stainless steel DZR brass Ball - Brass / chromium plated Membrane / O-rings Spring Stainless steel - 1) Please note that the maximum admissible differential pressure across the valve 150 kpa should also not be exceeded at partial load. 2) Please note that the maximum admissible differential pressure across the valve 250 kpa should also not be exceeded at partial load. EPDM Design 1. Shut-off knob 2. Differential pressure setting spindle 3. O-ring 4. Reference spring 5. Impulse tube connection 6. Diaphragm element 7. Control diaphragm 8. Pressure-relieved valve cone 9. Valve body 10. Seat n (turns) (kpa) (kpa) (kpa) (kpa) 1) ) DN 32/40 only DN Factory setting p setting range (kpa) kpa Fig. 8 ASV-PV (DN 15-40) ASV-PV is designed to maintain a constant set differential pressure. Via an internal connection and together with the reference spring (4), pressure in the return pipe acts on the underside of the control diaphragm (7) while via an impulse tube (5), pressure in the f low pipe acts on the top of the diaphragm. In this way the balancing valve maintains the set differential pressure. The ASV-PV valves are sold in four different p setting ranges. The valves are factory set to a defined value as described in the Factory seting table in Fig. 8, 9 and 10. Use the following procedure to set the desired differential presure: the setting on ASV-PV can be changed by turning the setting spindle (2). Turning the spindle clockwise increases the setting; turning it counter clockwise reduces the setting. If the setting is not known, turn the spindle fully clockwise. With this the setting the ASV-PV is at maximum value within the setting range. Now turn the spindle a number of times (n) as described in Fig. 8, 9 or 10 until the required differential pressure setting is obtained. 8 VD.A6.E4.12 Danfoss 12/2014 SMT/SI

9 Design (continuous) 1. Shut-off knob 2. Differential pressure setting spindle 3. O-ring 4. Reference spring 5. Impulse tube connection 6. Diaphragm element 7. Control diaphragm 8. Pressure-relieved valve cone 9. Valve body 10. Seat n (turns) (kpa) (kpa) (kpa) (kpa) Factory presetting p setting range (kpa) kpa DN 50 5 Fig. 9 ASV-PV (DN 50) SMT/SI VD.A6.E4.12 Danfoss 12/2014 9

10 Design (continuous) 1. Shut-off knob 2. Differential pressure setting spindle 3. O-ring 4. F lat gasket 5. Reference spring 6. Impulse tube connection 7. Diaphragm element 8. Control diaphragm 9. Pressure-relieved valve cone 10. Valve body 11. Seat 12. Measuring holes-plugged 13. Air-vent DN Factory presetting p setting range (kpa) kpa n (turns) Fig. 10 ASV-PV (DN ) (kpa) (kpa) (kpa) n (turns) (kpa) (kpa) (kpa) VD.A6.E4.12 Danfoss 12/2014 SMT/SI

11 Design (continuous) 1. Valve body 2. Ball 3. Ball seat 4. Supporting screw 5. Throttle bush 6. Closing bush 7. Valve top 8. Spindle head 9. Spindle 10. Rotation lock 11. Drain cock 12. Handle 13. Rotating measuring station 14. Measuring nipple 15. Impulse tube connection Fig. 11 ASV-BD DN Partner valves ASV-BD/M can be used together with the ASV-PV automatic balancing valves to control differential pressure in the risers. ASV-BD is a combined pre-setting and shut off valve with a range of unique features: high kv values for small pressure losses partner valve position inside or outside control loop (see page 2 for details), selectable even after the valve is already installed and under pressure. Numeric pre-setting scale, visible from multiple angles Easy locking of pre-setting Rotating measuring station with built-in measuring nipples for 3 mm needles Built-in drain cock with separate f low/return draining Removable hand wheel for easy mounting. Open-closed colour indicator. Impulse tube connection The impulse line must be connected to the impulse tube connection piece (15). In working position, one of the measuring nipples needs to be open while the other needs to be closed. There are two possible configurations, with partner valve inside or outside the control loop. This can be chosen by impulse tube connection side: - Partner valve outside the controlled loop: open the outlet measuring nipple (blue marking). ASV-BD needs to be set to the max setting (fully open). F low verification is possible. - Partner valve inside controlled loop: open inlet measuring nipple (red marking). F low limitation with flow verification is possible. Note: Default position is open inlet measuring nipple (blue marking). F low limitation Use the following procedure: 1. When the valve is open the lock is released. (An Allen key can also be used). 2. The handle pops up and the required f low setting may be set. 4. Lock the setting by pressing the handle until it clicks. 5. If needed, f low can be measured using PFM 100 or another brand of measuring instrument. F low verification (in case ASV-BD is used outside controlled loop) Use the following procedure: 1. ASV-BD setting is at maximum value. 2. F low can be measured using PFM 100 or another brand of measuring instrument. 3. If the pressure drop across the valve is too low for reliable f low measurement, ASV-BD needs to be set to the lower setting to achieve high enough pressure drop across the valve. 4. After flow measurement, return the setting to maximum value and lock it by pressing the handle until it clicks. Draining Use the following procedure to drain: 1. Close the open measuring nipple. 2. Remove the impulse tube. 3. Remove the adapter. Make sure the drain cock is secured with a spanner when the adapter is removed. 4. The blue nipple opens the outlet while the red measuring nipple opens the inlet. Make sure not to use more than a max. 3 turns. The drain tap and nipples can rotate to any position. Note: when draining, always keep same or higher static pressure on upper part of ASV-PV membrane. Therefore, always drain from the return pipe first and remove the impulse tube only after the return pipe is empty. If draining is done from flow pipe first, the membrane can be damaged. SMT/SI VD.A6.E4.12 Danfoss 12/

12 Design (continuous) 1. Shut-off knob 2. Shut-off spindle 3. O-rings 4. Valve cone 5. Seat 6. Valve body ASV-M is designed to shut-off the pipe f low. ASV-M has a connection for an impulse tube to ASV-PV. It can be equipped with nipples for f low measuring (these are sold separately as accessories). Fig. 12 Port A Port B ASV-M 12 VD.A6.E4.12 Danfoss 12/2014 SMT/SI

13 Sizing-design examples Δp a = Δp m + Δp r + Δp v Δp v Δp m Δp r Δp a Pressure drop across ASV-PV Pressure drop across ASV-M valve Necessary pressure for the riser Available pressure for the riser Fig Example Given: Radiator system with thermostatic radiator valves with pre-setting function. Desired f low for the riser (Q):... 1,500 l/h Minimal available pressure for that riser (Δp a)...70 kpa Estimated pressure drop over the riser at the desired f low (Δp r)...20 kpa Wanted: - Valve type - Valve size Since radiator valves has pre-setting function ASV-M is selected. Since desired pressure drop over the riser is 20 kpa ASV-PV is selected. ASV-PV should control 20 kpa pressure over the riser that means that 50 kpa out of 70 will be disposed over two valves. Δp v + Δp m = Δp a Δp r = = 50 kpa We presume that dimension DN 25 is the right dimension for this example (please mind that both valves should be of the same dimension). As ASV-M DN 25 is to be fully open pressure drop is calculated by following equation: 2. Example Correcting the f low with the differential pressure setting. Given: Measured f low for the riser Q 1...1,500 l/h ASV-PV valve s setting Δp r kpa Wanted: New valves setting to increase the f low for 10%, Q 2 = 1,650 l/h. Setting on the ASV-PV valve: When required, setting of the control pressure can be adjusted between 5 to 25 kpa or 20 to 40 kpa). By increasing/decreasing the setting it is possible to adjust the f low through the riser, terminal or similar. (100% increase of control pressure will increase the f low by 41%) p = 0.20 = Q = p1 Q If we increase the setting to 24 kpa f low will be increased to 10 % (1,650 l/h). 2 2 Q 1.5 pm = = = 0.14bar= 14 kpa Kv or by reading from diagram in Appendix A, fig. D as follows: Draw horizontal line from 1.5 m 3 /h (~1,500 l/h) trough the line that depicts dimension DN 25. From the intersection draw vertical line to read that pressure drop is 14 kpa. Pressure drop over ASV-PV valve is therefore: Δp v= (Δp a-δp r) Δp m = 50 kpa 14 kpa = 36 kpa as can be read from diagram in Appendix A, Fig. A. SMT/SI VD.A6.E4.12 Danfoss 12/

14 Sizing-design examples (continuous) 3. Example Limiting the f low with ASV-BD valve Given: Desired f low for the branch (Q): l/h ASV-PV and ASV-BD (DN 25) Setting on the ASV-PV valve (Δp o)...10 kpa Estimated pressure drop over the riser at desired f low (Δp r)... 4 kpa Required: Setting of the ASV-BD valve to achieve desired f low Solution: When required the ASV-BD can be adjusted to perform a flow limitation function. ASV-BD namely is inside the control loop of the pressure controller therefore adjusting the ASV BD would result in adjusting of the f low limitation. (The general rule is that a 100% increase of the kv value will increase the f low by 100%) k Q Δp v = 0.06 v = = Δp a = Δp i + Δp r + Δp v Δp v Pressure drop across ASV-PV valve Δp i Pressure drop across ASV-BD valve Δp o Pressure drop in the riser including ASV-BD Δp a Available pressure for the riser Δp r Pressure drop in the riser excluding ASV-BD Fig m The result can be seem in the diagram in Appendix A, Fig. C. With a desired f low pressure drop over the entire branch of 4 kpa. Without using ASV-BD, the f low through the branch when the control valve is fully open will be 58% higher thus causing overf low (4 kpa allows 880 l/h, while 10 kpa allows 1390 l/h). By adjusting the ASV-BD DN 25 to 90% k v value (3.6 m 3 /h) we will limit the f low to 880 l/h as desired. This value is obtained by the following calculation: Δp i = Δp o Δp r = 10 4 = 6 kpa. 3 h Δp a = Δp i + Δp r + Δp v Δp v Pressure drop across ASV-PV valve Δp i Pressure drop across MSV-F2 Δp o Pressure drop across the riser including MSV-F2 Δp a Pressure drop across the riser Δp r Pressure drop in the riser excluding MSV-F2 Fig Example F lat station application Given: No. of f lat stations connected to one riser... 5 Heating power of each station...15 kw Sanitary water heating on each station...35 kw Simultaneous factor (source TU Dresden) Desired f low for branch (Q):... 6,400 l/h Minimal available pressure for that riser ( p a)...80 kpa Estimated pressure drop over the riser at the desired f low ( p o)...50 kpa Wanted: - Valve type - Valve size For maximum f low calculation in the riser, simultaneous factors are used since sanitary water consumption is a temporary occurrence and is not used simultaneously in all apartments/f lats. Since water f low through the heat exchanger while heating sanitary water is not controlled, the maximum f low needs to be limited as well. As the desired pressure drop over the riser is 50 kpa ASV-PV with a range between 0.35 and 0.75 bar (35 and 75 kpa) is selected. Since 80 kpa is available for the riser, the p v shall be 30 kpa. p v = p a p o = = 30 kpa k Q Δp 6.4 v = = = v m /h For 6,400 l/h a DN 50 size valve is selected as calculated above or by looking at the diagram in Appendix A, fig. B. The f low through the riser can be limited with an ASV-BD or MSV-F2 if needed. 14 VD.A6.E4.12 Danfoss 12/2014 SMT/SI

15 Measurement of f low and differential pressure ASV-BD (needle type) is equipped with two measuring nipples so that the differential pressure across the valve can be measured using Danfoss measuring equipment or any other measuring device. Using the pressure drop graph for ASV-BD (Appendix A, fig C), the actual differential pressure across a valve can be converted to actual f low. Note: When measuring the f low, all radiator valves must be fully open (nominal f low). Measurement of differential pressure (Δp r) across riser. Fit a measuring connector (Danfoss code no. 003L814300) on the ASV-PV balancing valve drain cock (DN 15-50) or threaded connection closer to the terminal unit (TU). Measurements must be taken between the measuring nipple at ASV-BD/ASV-M/MSV-F2 valve port B and the measuring connector on the ASV-PV. Installation ASV-PV must be installed in the return pipe with f low in the direction of the arrow on the valve body. Partner valves (ASV-M/BD, MSV-F2 must be installed in the f low pipe, with f low in the direction of the arrow on the valve body. The impulse tube must be installed between partner valve and ASV-PV. The impulse tube must be f lushed through before installation. ASV-PV and ASV-BD must in addition be installed as determined by installation conditions. Pressure testing Max. test pressure bar When pressure testing the system you must ensure that both sides of the membrane have the same static pressure to prevent damage to the pressure controller. This means that the impulse tube must be connected and any needle valves must be open. If ASV-PV DN is installed in combination with ASV-M both valves must be open or closed (both valves must be in the same position!). If ASV PV DN is installed in combination with ASV-BD both valves must be open. During this operation (closing or opening the valves) please make sure that there is never lower pressure on the upper side of the membrane to prevent damaging it. Starting During system start opening the shut-off on the ASV-PV and partner valve (please ensure that there is the same static pressure on both sides or higher pressure on the upper side of the membrane). If filling is managed by opening the ASV-PV and partner valve, please make sure there is a pressure on the upper side of the membrane by opening the partner valve before the ASV-PV is opened. SMT/SI VD.A6.E4.12 Danfoss 12/

16 Dimensions ASV-PV DN L1 L2 L3 H1 H2 D1 D2 S a b c mm ISO 7/1 ISO 228/ Rp ½ G ¾ A Rp ¾ G 1 A Rp 1 G 1¼ A Rp 1¼ G 1½ A G ¾ A 245 1) Rp 1½ G 1¾ A 250 1) 1) kpa setting range Fig VD.A6.E4.12 Danfoss 12/2014 SMT/SI

17 Dimensions (continuous) ASV-PV p setting range L1 L2 L3 H1 H2 D1 D2 b c DN kpa mm ISO 228/ G 21/2 G 3/4 A ASV-PV L1 H1 H2 D1 D2 D3 DN mm Fig. 17 SMT/SI VD.A6.E4.12 Danfoss 12/

18 Dimensions (continuous) H ASV-BD DN L H S a mm ISO 228/ G ½ G ¾ G G 1¼ G 1½ G 2 a L G1/4 S a ASV-M DN L1 L2 L3 H1 H2 D1 S a b mm ISO 7/1 ISO 228/ Rp ½ G ¾ A Rp ¾ G 1 A Rp 1 G 1¼ A Rp 1¼ G 1½ A Rp 1½ G 1¾ A G 2¼ A Fig VD.A6.E4.12 Danfoss 12/2014 SMT/SI

19 Appendix A-Sizing diagram Fig. A - Sizing diagram ASV-P/PV DN SMT/SI VD.A6.E4.12 Danfoss 12/

20 Appendix A-Sizing diagram Fig. B - Sizing diagram ASV-PV DN VD.A6.E4.12 Danfoss 12/2014 SMT/SI

21 Appendix A-Sizing diagram Fig.C - Sizing diagram ASV-BD DN SMT/SI VD.A6.E4.12 Danfoss 12/

22 Appendix A Fig. E -Pressure drop over ASV-M valves, DN VD.A6.E4.12 Danfoss 12/2014 SMT/SI

23 Fittings Description Fittings For valves with external thread Danfoss offers threaded or welded tailpieces as accessory. Materials Nut...brass Tailpiece welded...steel Tailpiece threaded...brass Ordering Note: ASV-PV DN 50 (2 1/2 ) and ASV-M DN 50 (2 1/4 ) have different size connections. 1) To use with ASV-PV DN 50 valves. 2) To use with ASV-M DN 50 valves. Fittings Type Comments to pipe to valve Code No. R 1/2 DN Z R 3/4 DN Z Tailpiece threaded (1 pcs.) R 1 DN Z R 1 1/4 DN Z R 2 DN 50 (2 1/4 ) 003Z ) DN 50 (2 1/2 ) 003Z ) ASV-PV tender text 1. The pressure differential control valve should be available in the range from DN The pressure differential control should be based on integrated membrane element. 3. The range of settable differential pressure should be 5-25kPa, 20-40kPa or kpa in dimension DN and kpa, kpa or kpa in dimension DN For radiator applications a differential pressure of 5-25kPa is recommended. 4. The setting of the differential pressure should be with a hexagon key (DN 15-40) or, if by socket it should be hidden. 5. The differential pressure setting should be linear (1 turn 1 kpa or 1 turn 2 kpa depending on the valve size). 6. Shut off service function should be possible by a handle/knob. 7. Drain function is needed in range DN Temperature range should be C at DN and C at DN Nominal pressure should be 16 bar with test pressure 25 bar. 10. The pressure differential control valve package in DN range needs to contain an impulse tube (min. 1.5 m) and EPS valve insulation up to min. 80 C. Nominal diameter: Connection: Adjustment range from - to kpa Produced by: Danfoss Type: ASV-PV Ordering no.: 003L SMT/SI VD.A6.E4.12 Danfoss 12/

24 24 VD.A6.E4.12 Produced by Danfoss A/S 12/2014