Balancing valve PN 16 and PN 25 DN

Transcription

1 STAF, STAF-SG Balancing valve PN and PN DN 0-00 Pressurisation & Water Quality Balancing & Control Thermostatic Control ENGINEERING ADVANTAGE A flanged, cast iron (STAF) and ductile iron (STAF-SG) balancing valve that delivers accurate hydronic performance in an impressive range of applications. The STAF/STAF-SG is ideal for use mainly on the secondary side in heating and cooling systems.

2 Handwheel Equipped with a digital read-out, the handwheel ensures accurate and straightforward balancing. Self-sealing measuring points For simple, accurate balancing. Positive shut-off function For easy maintenance. Technical description Applications: Heating and cooling systems. Functions: Balancing Pre-setting Measuring Shut-off (The balancing cone for valve DN -00 is pressure released). Dimensions: STAF: DN - STAF-SG: DN 0-00 Pressure class: STAF: PN STAF-SG: PN and PN (see each product) Temperature: Max. working temperature: C For higher temperatures (max. C), please contact the nearest sales office. Min. working temperature: STAF: - C STAF-SG: -0 C Surface treatment: DN 0-00: Epoxy painting. DN 0-00: Duasolid painting. Marking: Body: TA, PN, DN, flow direction arrow, material and casting date (year, month, day). CE-marking according to table: Marking STAF STAF-SG (PN ) STAF-SG (PN ) CE DN - DN 00 DN 0- CE 009* DN 0-00 DN -00 *) Notified body. Face to face length: ISO series, BS 00 and EN - series. Material: Body, STAF: Cast iron EN-GJL-0 (GG ). Body, STAF-SG: Ductile iron EN-GJS-00-. DN 0-: Bonnet, restriction cone and spindle of AMETAL. DN 00-00: Bonnet of ductile iron, cone of Bronze and spindle of AMETAL. DN 0-00: Bonnet of ductile iron, cone of silicon brass CuZnSi-C (EN 9) or brass CuZnPbAl-C-GS (EN 9) and spindle of AMETAL. Seat seal: Cone with EPDM ring. Bonnet bolts: Chromed steel. Handwheel: DN 0- polyamide, DN aluminium. AMETAL is the dezincification resistant alloy of TA.

3 Measuring points Measuring point are self-sealed. Remove the cap and insert the probe through the seal. Sizing When Δp and the design flow are known, use the formula to calculate the Kv-value or use the diagram. Measuring accuracy The handwheel zero position is calibrated and must not be changed. Deviation of flow at different settings The curve (Fig. ) holds for valves with the correct flow direction, straight pipe distances (Fig. ) and normal pipe fittings. Fig. DN 0-0 ± % 0 0 0,,,, *) DN -00 ± % *) *) Setting, No. of turns. *) Setting (%) of fully open valve. Fig. D D D D

4 Correction factors The flow calculations are valid for water (+0 C). For other liquids with approximately the same viscosity as water ( 0 cst = E=0S.U.), it is only necessary to compensate for the specific density. However, at low temperatures, the viscosity increases and laminar flow may occur in the valves. This causes a flow deviation that increases with small valves, low settings and low differential pressures. Correction for this deviation can be made with the software TA Select or directly in TA s balancing instruments. Kv values DN 0-0 Turns DN 0 DN DN DN 0 DN , 0,0,,, 0,,0,90,0,.,9,,,0,,90,,,,.,0,0,,0,,,90 9,0,,.,,00,,0,,0,0, 9, DN - Turns DN - DN 0 DN 0 DN DN 0.,,,,,,.,9 9,,,, 0. 9,, 0., 9,, 9 9., , ,

5 DN Turns DN 00 DN 0 DN 00 DN 0 DN

6 Setting It is possible to read the set value on the handwheel. The number of turns between the fully open and closed positions is: turns for DN 0-0, turns for DN -, turns for DN 00-0, turns for DN 00, 0 turns for DN 0 and turns for DN 00. Initial setting of a valve for a particular pressure drop, e g corresponding to. turns on the graph, is carried out as follows:. Close the valve fully (Fig ). Open the valve to. turns (Fig. ).. Using an Allen key, turn the inner spindle clockwise until the stop position.. The valve is now set. To check the setting of a valve, first close the valve, then open it to the stop position; the indicator then shows the presetting number, in this case. (Fig. ). Example DN Fig. Valve closed Fig. The valve is set at. Example DN 00 Fig. Valve closed Fig. The valve is set at.

7 Diagram example Wanted: Presetting for DN at a desired flow rate of. m /h and a pressure drop of 0 kpa. Solution: Draw a straight line joining. m /h and 0 kpa. This gives Kv=. Now draw a horizontal line from Kv=. This intersects the bar for DN at the desired presetting of. turns. NOTE: If the flow rate falls outside the scale in the diagram, the reading can be made as follows: Starting with the example above, we get 0 kpa, Kv = and flowrate. m /h. At 0 kpa and Kv = 0. we get the flow-rate 0. m /h, and at Kv = 0, we get m /h. That is, for a given pressure drop, it is possible to read times or 0. times the flow and Kv-values. Diagram DN ,, ,, 0 0, 0, 0, 0, 0, 0,,,,,,,,,, 0,,, 0, 0, 0, 0,,0, 0, 0, 0, 0, 0, 0, 0, 0,, 0, 0, 0,,0,,0 0 0*) 0, 0,,0 0 0,0 0,0 0, 0, 0, 0, 0, 0,,0 0 **) 0,0 0, 0,,0 0 0,0 0,0 0,0 0,0 l/s m /h Kv DN mh O kpa 0 0 0,0 *) db (A) **) db (A) Recommended area: See Fig. under Measuring accuracy.

8 Diagram DN -, , , 0, 0, 0, 0,,, ,,0,,0,,0 0 0*) 0, 0,,,,, 0, 0, 0,,0,0 0 0 **) 0,,0 0 l/s m /h Kv DN mh O kpa *) db (A) **) db (A) Recommended area: See Fig. under Measuring accuracy.

9 Diagram DN , , 0, 0, 0, 0,,0,,0,, *) 0 0 0, ,0 0 **),0 0 l/s m /h Kv DN mh O kpa *) db (A) **) db (A) Recommended area: See Fig. under Measuring accuracy. 9

10 Articles STAF (cast iron) Bolted bonnet PN, ISO 00-, EN 9- Article No EAN DN Number of bolt holes D L H Kvs Kg Articles STAF-SG (ductile iron) Threaded bonnet PN, ISO 00-, EN 9- (DN 0-0 also fit PN flanges) Article No EAN DN Number of bolt holes D L H Kvs Kg Bolted bonnet PN, ISO 00-, EN 9- Article No EAN DN Number of bolt holes D L H Kvs Kg = Flow direction Kvs = m /h at a pressure drop of bar and fully open valve.

11 Bolted bonnet Measuring points on body PN, ISO 00-, EN 9- Article No EAN DN Number of bolt holes D L H Kvs Kg PN, ISO 00-, EN 9- Article No EAN DN Number of bolt holes D L H Kvs Kg = Flow direction Kvs = m /h at a pressure drop of bar and fully open valve. Accessories Measuring points Article No EAN d L L d - DN / / DN / / Measuring point Extensions 0 mm (not for 9-000/-0). Can be installed without draining of the system. Article No EAN d L Measuring point max C + older STAD and STAF Article No EAN d L - DN R/ R/ 90 DN R/ R/ 90

12 Identification tag Incl pc per valve Article No EAN , Handwheel Complete Article No EAN DN Allen key Article No EAN For DN mm mm - - mm Insulation For heating/cooling See catalogue leaflet Prefab insulations for complete details. Article No EAN For DN L D C The products, texts, photographs, graphics and diagrams in this document may be subject to alteration by TA Hydronics without prior notice or reasons being given. For the most up to date information about our products and specifications, please visit -- STAF, STAF-SG 0.0