STA Double regulating valves DN -0
IMI TA / Balancing valves / STA STA The STA double regulating valve delivers accurate hydronic performance in an impressive range of applications. Ideally suited for use on the secondary side in heating, cooling and tap water systems. Key features > > Handwheel Equipped with a digital read-out, the handwheel ensures accurate and straightforward balancing. Positive shut-off function for easy maintenance. > > AMETAL Dezincification resistant alloy that guarantees a longer valve lifetime and lowers the risk of leakage. Technical description Application: Heating and cooling systems Tapwater systems Functions: Pre-setting Shut-off Draining Dimensions: DN -0 Pressure class: PN Temperature: Max. working temperature: 0 C. (For higher temperatures max. 0 C, please contact the nearest sales office). Min. working temperature: -0 C Material: Valve body and bonnet: AMETAL Sealing (body/bonnet): EPDM O-ring Valve plug: AMETAL Seat seal: EPDM O-ring Spindle: AMETAL Slip washer: PTFE Spindle seal: EPDM O-ring Spring: Stainless steel Handwheel: Polyamide and TPE Draining: AMETAL Sealing: EPDM Gaskets: Fiber-based aramid AMETAL is the dezincification resistant alloy of IMI Hydronic Engineering. Marking: Body: IMI, TA, PN /00 WWP, DN and inch size. DN 0 also CE. Orange/grey handwheel: TA, STA* and DN. Connection: Female thread according to ISO 8. Thread length according to ISO 7/.
Draining Valves with draining for G/ hose connection. Sizing When Δp and the design flow are known, use the formula to calculate the Kv value or use the diagram. Kv values Turns DN DN 0 DN DN DN 0 DN 0 0.6 99.9.89.6 0.6 0.78.0.09.0.0. 0.7...6.7 6.76 0.68.9.6. 6... 0.9.7.6 7.77 9.6.8.6.7 6.6 9.8.8...07. 7.79.9 6. 7.0.6.9 8.9. 9.. NOTE: In softwares (HySelect, HyTools) and balancing instrument (TA-SCOPE) the STA, PN version, is named STA*. Measuring accuracy The handwheel zero position is calibrated and must not be changed. Deviation of flow at different settings The curve (Fig. ) is valid for valves with normal pipe fittings (Fig. ). 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 % more). Fig. ± % 0 8 6 0 0.0.0..0..0..0 *) *) Setting, No. of turns. Fig. D D D 0 D D = Valve DN
IMI TA / Balancing valves / STA Correction factors The flow calculations are valid for water (+0 C). For other liquids with approximately the same viscosity as water ( 0 cst = E=00S.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 HySelect or directly in our balancing instruments. Setting 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. turns (Fig. ).. Using a mm Allen key, turn the inner spindle clockwise until stop.. 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. (Fig. ). 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. ). Opening it further will not increase the capacity. Fig. Fig. Fig. Valve closed The valve is set at. Fully open valve Diagram example Wanted: Presetting for DN at a desired flow rate of,6 m /h and a pressure drop of 0 kpa. Solution: Draw a straight line joining,6 m /h and 0 kpa. This gives Kv=,06. Now draw a horizontal line from Kv=,06. This intersects the bar for DN which gives, 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 0 kpa, Kv=.06 and flow-rate.6 m /h. At 0 kpa and Kv=06 we get the flow-rate 0.6 m /h, and at Kv=0.6, we get 6 m /h. That is, for a given pressure drop, it is possible to read 0 times or 0. times the flow and Kv-values.
Diagram 0 00 0. 7 70 0 0. 0. 0..... 0.7 0 0 0 0 7................. 0. 0. 0. 0.7.0. 0 0. 0. 0. 0. 0.7...0..0 0 0 0.0 0.0 0. 0. 0. 0. 0. 0...0.0 0 0 0.0 0. 0. 0.0 00 0.0 0.07 0.07 0.0 l/s m³/h KV DN 0 0 0 mh O kpa NOTE: In softwares (HySelect, HyTools) and balancing instrument (TA-SCOPE) the STA, PN version, is named STA*.
IMI TA / Balancing valves / STA Articles d L D H With drain Female threads. Thread according to ISO 8. Thread length according to ISO 7/. DN D L H Kvs Kg Article No d = G/ * G/ 8 00,6 0,6 80-6 0* G/ 9 00,9 0,6 80-60 G 0 0 8,9 0,77 80-6 G / 0,, 80-6 0 G / 6 0 9,, 80-60 0 G 0,, 80-60 = Flow direction Kvs = m /h at a pressure drop of bar and fully open valve. *) Can be connected to smooth pipes by KOMBI compression coupling. NOTE: In softwares (HySelect, HyTools) and balancing instrument (TA-SCOPE) the STA, PN version, is named STA*. Accessories Handwheel Complete Article No Orange/grey 86-008 Identification tag Article No 6-990 Allen key [mm] Article No Pre-setting 87-0 Insulation For heating/cooling CFC-free polyurethane. Covered with grey PVC. See catalogue leaflet Prefab insulations for complete details. For DN L H D B Article No 0-0 90 0 89-6 7 9 0 89-6 9 6 06 0 89-6 0 69 08 89-60 0 78 08 89-60 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 www.imi-hydronic.com. --0 UK STA (PN ) ed. 07.08