STAF, STAF-SG, STAF-R, STAG

Transcription

1 STAF, STAFSG, STAFR, STAG Balancing valves 0. Technical description Applications: STAF, STAFSG, STAG: Heating and cooling systems STAFR: Heating and cooling systems Tapwater systems Functions: Balancing Presetting Measuring Shutoff (The balancing cone for valve DN 00 is pressure released). Pressure class: PN and PN (see each product) Temperature: Max. working temperature: C For higher temperatures (max.0 C), please contact closest sales office. Min. working temperature: STAF: C STAFSG, STAG, STAFR: C Material: Body: STAF: Cast iron ENGJL0 (GG ). STAFSG/STAG: Ductile iron ENGJS00. STAFR: Bronze CuSnZnPb. DN 0: Bonnet, restriction cone and spindle of AMETAL. DN 000: Bonnet of ductile iron, cone of Bronze and spindle of AMETAL. DN 000: Bonnet of ductile iron, cone of silicon brass CuZnSiC (EN 9) or brass CuZnPbAlCGS (EN 9) and spindle of AMETAL. Seat seal: Cone with EPDM ring. Bonnet bolts: Chromed steel. Digital handwheel: DN 0 are fitted with a red Polyamide plastic handwheel, DN 000 with a red aluminium handwheel. Surface treatment: STAF, STAFSG and STAG: DN 0: Epoxy painting. DN 000: Duasolid painting. Marking: STAF, STAFSG, STAFR: Body: TA, PN, DN, flow direction arrow, material and casting date (year, month, day). STAG: Body: TA, Class 0, inch size, flow direction arrow, material and casting date (year, month, day). CEmarking according to table. Marking STAF *) Registered body. STAFSG (PN ) STAFSG (PN ) STAFR STAG CE DN 0 DN 0 DN 0 DN 0 DN CE 009* DN 000 DN 000 DN 000 Face to face length: ISO series, BS 0 and EN series. Measuring points Measuring points are selfsealed. Remove the cap and insert the probe through the seal. AMETAL is the dezincification resistant alloy of TA.

2 STAF: Cast iron Bolted bonnet PN, ISO 00, EN 9 TA No DN *) D L H Kvs Kg = Flow direction *) Number of bolt holes. Kvs = m /h at a pressure drop of bar and fully open valve. STAFSG: Ductile iron Threaded bonnet PN, ISO 00, EN 9 (DN 0 also fit PN flanges) TA No DN *) D L H Kvs Kg Bolted bonnet PN, ISO 00, EN 9 TA No DN *) D L H Kvs Kg Bolted bonnet Measuring points on body PN, ISO 00, EN 9 TA No DN *) D L H Kvs Kg PN, ISO 00, EN 9 TA No DN *) D L H Kvs Kg = Flow direction *) Number of bolt holes. Kvs = m /h at a pressure drop of bar and fully open valve.

3 STAFR: Bronze Bolted bonnet PN, ISO 00, EN 9 TA No DN *) D L H Kvs Kg = Flow direction *) Number of bolt holes. Kvs = m /h at a pressure drop of bar and fully open valve. STAG: Ductile iron, groove end (Victaulic) Bolted bonnet Measuring points on body PN, ISO 0 TA No DN ØD L H Kvs Kg ) Not comforming to ISO 0. Kvs = m /h at a pressure drop of bar and fully open valve. = Flow direction

4 Example DN and DN 0 Example DN Fig. Valve closed Fig. The valve is set at. Example DN 0 Fig. Valve closed Fig. The valve is set at. 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, turns for DN 0, turns for DN 00, turns for DN 00, 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 a Allen key, turn the inner spindle clockwise until stop.. The valve is 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. ).

5 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 00 ± % *) *) Setting (%) of fully open valve. Fig. D D D D Correction factors The flow calculations are valid for water (+ C). For other liquids with approx. the same viscosity as water ( 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 direct in TACBI.

6 Sizing When p and the design flow are known, use the formula to calculate the Kvvalue or use the diagram. Support material Software TA Select: Makes it easy to choose the right balancing valves by taking into account the desired flow, pressure drop and flow rate. Measuring instruments Use the balancing instrument TACBI. It is programmed with valve characteristics for TA valves, enabling measured differential pressure to be read off directly as a flow rate. For further information on TACBI, see catalogue leaflet TACBI. Conversion disc By using the conversion disc it is easy to calculate the relationship between flow, pressure and setting values for all valve sizes. Manuals See the following manuals for descriptions of various balancing methods: Total hydronic balancing Manual no. : Balancing control circuits Manual no. : Balancing distribution systems Manual no. : Balancing of radiator systems Manual no. : Hydronic balancing with differential pressure controllers

7 Kv values DN Pos , 0, 0,0,,,,,,, 0,,0,90,0,,,,,9,,,0,,9 9,,90,,,,,,, ,,0,0,,0, 9, 0,,90 9,0,,, 0 0 0,,,00,,0,, 9, ,0,0, 9,, ,, , 0, , , 0, Example Wanted: Presetting for DN at a desired flow rate of. m /h and a pressure drop of kpa. Solution: Draw a straight line joining. m /h and 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 kpa, Kv = and flowrate. m /h. At kpa and Kv = 0. we get the flowrate 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 Kvvalues.

8 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 l/s m /h Kv DN mh O kpa 0 0,0 *) 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, 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 Diagram DN , , 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.

11 Accessories Measuring points L d TA No d L DN / / DN / 9 90 / Measuring point Extensions 0 mm (not for 9000/0). Can be installed without draining of the system. TA No 900 Measuring point max 0 C + older STAD et STAF TA No d L d L DN R/ 0 90 R/ 90 DN R/ 0 90 R/ 90 Identification tag Incl pc per valve TA No 990 Handwheel Complete TA No DN , Allen key TA No For DN mm 0 mm 0 mm 000 Tour & Andersson retains the right to make changes to its products and specifications without prior notice.

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