STAD-C. Balancing valves DN 15-50
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1 STAD-C Balancing valves 15-50
2 IMI TA / Balancing valves / STAD-C STAD-C The STAD-C balancing valve has been specially developed for use in indirect cooling systems but performs just as effectively in refrigerated counters and cold-storage rooms. Whatever the application, the STAD-C delivers unrivalled hydronic performance. Key features > > Handwheel Equipped with a digital read-out, the handwheel ensures accurate and straightforward balancing. Positive shut-off function for easy maintenance. > > Self-sealing measuring points Doubly secured and self-sealing for total protection against leakage. Also enable more straightforward maintenance. > > AMETAL Dezincification resistant alloy that guarantees a longer valve lifetime, and lowers the risk of leakage. Technical description Application: Heating and cooling systems Tap water systems Functions: Balancing Pre-setting Measuring Shut-off Dimensions: Pressure class: PN 20 Temperature: Max. working temperature: 150 C (At temperatures higher than 120 C, the handwheel should be removed.) Min. working temperature: -20 C Material: The valves are made of AMETAL Seat seal: Stem with EPDM or FPM (Viton ) O-ring Spindle seal: EPDM or FPM (Viton ) O-ring Handwheel: Polyamide and TPE AMETAL is the dezincification resistant alloy of IMI Hydronic Engineering. Marking: Body: TA, PN 20/150, and inch size. Handwheel: Valve type and. 2
3 Measuring points The measuring points on STAD-C are self-sealed and doublesecured. Connect the measuring hoses directly on the measuring points, then open the measuring points by using a wrench. Close the measuring points before disconnecting the measuring hoses. Sizing When Δp and the design flow are known, use the formula to calculate the Kv value or use the diagram. Kv values Turns 15/ Measuring accuracy The handwheel zero position is calibrated and must not be changed. Deviation of flow at different settings The curve (Fig. 4) is valid for valves with normal pipe fittings (Fig. 5). Try also to avoid mounting taps and pumps, immediately before the valve. The valve can be installed with the opposite flow direction. The specified flow details are also valid for this direction although tolerances can be greater (maximum 5% more). Fig. 5 2 D 5 D 2 D 10 D Fig. 4 ± % ,5 1 1,5 2 2,5 3 3,5 4 *) *) Setting, No. of turns. 3
4 IMI TA / Balancing valves / STAD-C Correction factors The flow calculations are valid for water (+20 C). For other liquids with approximately the same viscosity as water ( 20 cst = 3 E=100S.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 our balancing instruments. Setting Setting of a valve for a particular pressure drop, e g corresponding to 2.3 turns on the graph, is carried out as follows: 1. Close the valve fully (Fig 1). 2. Open the valve 2.3 turns (Fig. 2). 3. Using a 3 mm Allen key, turn the inner spindle clockwise until stop. 4. The valve is now set. To check the setting: Close the valve, the indicator shows 0.0. Open it to the stop position. The indicator then shows the set value, in this case 2.3 (Fig. 2). Diagrams showing the pressure drop for each valve size at different settings and flow rates are available to help determine the correct valve size and pre-setting (pressure drop). Four turns corresponds to fully opened valve (Fig. 3). Opening it further will not increase the capacity. Fig. 1 Fig. 2 Fig. 3 Valve closed The valve is set at 2.3 Fully open valve Diagram example Wanted: Presetting for 25 at a desired flow rate of 1,6 m 3 /h and a pressure drop of 10 kpa. Solution: Draw a straight line joining 1,6 m 3 /h and 10 kpa. This gives Kv=5. Now draw a horizontal line from Kv=5. This intersects the bar for 25 which gives 2,35 turns. NOTE: If the flow rate is out of the scale in the diagram, the reading can be made as follows: Starting with the example above, we get 10 kpa, Kv=5 and flow-rate 1.6 m 3 /h. At 10 kpa and Kv=0,5 we get the flow-rate 0,16 m 3 /h, and at Kv=50, we get 16 m 3 /h. That is, for a given pressure drop, it is possible to read 10 times or 0.1 times the flow and Kv-values. 4
5 Diagram 5
6 IMI TA / Balancing valves / STAD-C Articles L D Male thread Thread according to ISO 228. Thread length according to DIN H D L H Kvs Kg EAN Article No 15/14 G3/ ,52 0, G ,70 0, G1 1/ ,70 0, G1 1/ ,2 1, G ,2 1, G2 1/ ,0 2, With FPM (Viton ) D L H Kvs Kg EAN Article No 15/14 G3/ ,52 0, G ,70 0, G1 1/ ,70 0, G1 1/ ,2 1, G ,2 1, G2 1/ ,0 2, L ØD Soldering ends H D L H Kvs Kg EAN Article No 15/ ,52 0, ,70 0, ,70 0, ,2 1, ,2 1, ,0 2, = Flow direction Kvs = m 3 /h at a pressure drop of 1 bar and fully open valve. 6
7 Accessories Welding connection Swivelling nut Max 150 C Valve D Pipe EAN Article No 10 G1/ G3/ G G1 1/ G1 1/ G G2 1/ Soldering connection Swivelling nut Max 150 C Valve D Pipe Ø EAN Article No 10 G1/ G1/ G3/ G3/ G G G1 1/ G1 1/ G G2 1/ Connection with smooth end For connection with press coupling Swivelling nut Max 150 C Valve D Pipe Ø EAN Article No 10 G1/ G3/ G G G1 1/ G1 1/ G G2 1/ D Compression connection Max 100 C Support bushes shall be used, for more information see catalogue leaflet FPL. Valve D Pipe Ø EAN Article No 10 G1/ G1/ G1/ G1/ G1/ G3/ G3/ G3/ G
8 IMI TA / Balancing valves / STAD-C Handwheel Complete EAN Article No Keyed nut Should replace the handwheel if the working temperature of the system exceeds 120 C. A stop screw is attached if permanent fitting is wanted. Suitable for STA, STAD, STADA, STAD-C, STA-DR, STAF-SG ( 20-50) and STS. EAN Article No Identification tag Incl 1 pc per valve EAN Article No Allen key [mm] EAN Article No 3 Pre-setting Draining The products, texts, photographs, graphics and diagrams in this document may be subject to alteration by IMI Hydronic Engineering without prior notice or reasons being given. For the most up to date information about our products and specifications, please visit STAD-C
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