2-Port Seat Valves with Flange, PN 16

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1 Port Seat Valves with Flange, PN 6 VVF45... dular cast iron EN-GJS valve body DN k vs m /h Can be equipped with SKB...- or SKC...- electrohydraulic actuators Use For use in district heating, heating, ventilating, and air conditioning systems as a control or safety shutoff valve For open and closed circuits (mind cavitation, refer to page 5). CMN445en Building Technologies HVAC Products

2 Type summary Type reference DN k vs [m / h] S v VVF > VVF45.50 VVF VVF VVF VVF VVF > 00 DN = minal size k vs = minal flow rate of cold water (5 0 C) through the fully open valve (H 00 ) by a differential pressure of 00 kpa ( bar) S v = Rangeability k vs / k vr k vr = Smallest k v value, at which the flow characteristic tolerances can still be maintained, by a differential pressure of 00 kpa ( bar) High performance versions Type Type suffix Description Examples VVF Sealing gland with PTFE sleeve for temperatures up to 80 C VVF Accessories Type Description ASZ6.5 Electric stem heating element, AC 24 V / 0 W, required for media below 0 C Order Delivery Example: When ordering please give quantity, product name and type reference. 2 2-port valves VVF45.50 Valves, actuators and accessories are packed and supplied separately. The valves are supplied without counter-flanges and without flange gaskets. Spare parts See overview, section Spare parts, page 0 Equipment combinations Valves Actuators SKB... SKC... VVF45.49 VVF45.50 H 00 p max p s p max p s [mm] [kpa] VVF VVF VVF VVF VVF45.92 H 00 = minal stroke p max = Maximum permissible differential pressure across the valve, valid for the entire actuating range of the motorized valve p s = Maximum permissible differential pressure at which the motorised valve will close securely against the pressure (close off pressure) /0 Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

3 Actuator overview Type Actuator type Operating voltage Positioning signal Spring return Positioning time Positioning force Data sheet SKB2.50 SKB2.5 SKB82.50 SKB82.5 SKB60 SKB62 Electrohydraulic AC 20 V AC 24 V -position DC 0 0 V ) 20 s 2800 N N4564 N4566 SKC2.60 SKC2.6 SKC82.60 SKC82.6 SKC60 SKC62 Electrohydraulic AC 20 V AC 24 V -position DC 0 0 V ) 20 s 2800 N N4564 N4566 ) or DC 4 20 ma Pneumatic actuators Do not use VVF45... with pneumatic actuators. Technical design / mechanical design Valve cross section 440Z02 For all nominal sizes, a guided slot plug is used that is directly connected to the valve stem. The seat is screwed to the valve body with the aid of special gland material. The two-port seat valve does not become a three-port valve by removing the blank flange! Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products /0

4 Sizing Flow diagram p v00 [bar] SKC... SKB ,0 0,02 0,0 0,04 0,05 0, 0,2 0, 0,4 0, V 00 [m³/h] DN - k vs p max ,4 6,8 4,2 8,4 5,8 2,8 2,2,7,4, 0,85 0,6 V 00 [l/s] p v00 [kpa] D0 p max = Maximum permissible differential pressure across the valve, valid for the entire actuating range of the motorised valve p v00 = Differential pressure across the fully open valve and the valve s control path by a volume flow V 00 V & 00 = Volume flow through the fully open valve (H 00 ) 00 kpa = bar 0 mwc m /h = l/s water at 20 C Valve flow characteristic 40D02 Flow k v / k vs % linear 0 00 % equal percentage n gl = as per VDI / VDE Stroke H / H 00 4/0 Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

5 Cavitation te on chilled water Cavitation accelerates wear on the valve plug and seat, and also results in undesirable noise. Cavitation can be avoided by not exceeding the differential pressure shown in the flow diagram on page 4, and by adhering to the static pressures shown below. To avoid cavitation in chilled water circuits ensure sufficient counter pressure at valve outlet, e.g. by a throttling valve after the heat exchanger. Select the pressure drop across the valve at maximum according to the 80 C curve in the flow diagram below P [kpa] 500 ϑ 80 C 60 C 20 C 00 C 80 C 40 C 5 P [bar] p max [kpa] 482D05 p max = Differential pressure with valve almost closed, at which cavitation can largely be avoided p p p p M ϑ = Static pressure at inlet = Static pressure at outlet = Pump = Water temperature M pmax 482Z06 High temperature hot water example: Pressure p at valve inlet: 500 kpa (5 bar) Water temperature: 20 C From the diagram above, it will be seen that with the valve almost closed, the maximum permissible differential pressure p max is 200 kpa (2 bar). Chilled water example: Spring water cooling as an example of avoiding cavitation: Chilled water = 2 C p = 500 kpa (5 bar) p 4 = 00 kpa ( bar) (atmospheric pressure) p max p - = 00 kpa ( bar) = 20 kpa (0.2 bar) p D (throttle) = 80 kpa (0.8 bar) p = pressure after consumer in kpa M p 4 p p D p max p p ' 482Z07 5/0 Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

6 Working pressure and medium temperature Fluids Working pressure [bar] VVF45... VVF D04 Medium temperature [ C] Working pressure and medium temperature staged as per ISO 7005 Current local legislation must be observed. Saturated steam Superheated steam Absolute working pressure [bar] SKB... SKC D05 < 50 C: VVF45 > 80 C: VVF45 4 Medium temperature [ C] wet steam saturated steam superheated steam avoid permissible range of use Recommendation For saturated steam and superheated steam the differential pressure p max across the valve should be close to the critical pressure ratio. p p Pressure ratio = 00% p p p = absolute pressure before valve in kpa = absolute pressure after valve in kpa Calculation of the k vs value for steam Subcritical range p p 00% < 42% p Pressure ratio < 42% subcritical Supercritical range p p 00% 42% P Pressure ratio 42% supercritical (not recommended) k vs = 4.4 m& k p (p p ) k vs m& = 8.8 k p 6/0 m& = steam quantity in kg/h k = factor for superheating of steam = T (k = for saturated steam) T = temperature differential in K between saturated steam and superheated steam Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

7 Example given saturated steam 4.6 C p = 400 kpa (4 bar) m& = 400 kg/h pressure ratio = 0 % saturated steam 4.6 C p = 400 kpa (4 bar) m& = 400 kg/h pressure ratio = 42 % (supercritical permitted) required k vs, valve type k vs, valve type procedure 0 p = p 00 p p = 400 = 280 kpa (2.8bar) 00 k = m / h k vs = 8.8 = 0.8 m / h 280 ( ) 400 vs = selected k vs = 49 m /h VVF k vs = m /h VVF tes Engineering We recommend installation in the return pipe, as the temperatures in this pipe are lower for applications in heating systems, which in turn, extends the stem sealing gland's life. In open circuits the valve plug may seize as the result of scale deposits. In these applications, only the most powerful SKB or SKC actuators should be used. Further the valve should be exercised at regular intervals (two to three times per week). A strainer MUST be fitted at the valve inlet Ensure cavitation free flow (refer to page 5). To ensure the reliability of the valve, we recommend the fitting of a strainer at the valve inlet even in closed circuits. For media below 0 C, use the electric ASZ6.5 stem heating element to prevent the valve stem from freezing in the sealing gland. For safety reasons, the stem heating element has been designed for AC 24 V / 0 W operating voltage. The use of these valves for steam is subject to specific parameters: Observe diagram for steam on page 6 and «Technical Data» on page 9! Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products /0

8 Mounting Both valve and actuator can easily be assembled at the mounting location. Neither special tools nor adjustments are required. The valve is supplied with Mounting Instructions Orientation Z6 Direction of flow Commissioning When mounting, pay attention to the valve's flow direction symbol. Commission the valve only if the actuator has been mounted correctly. Valve stem retracts: valve opens = increasing flow Valve stem extends: valve closes = decreasing flow Maintenance VVF45... valves require no maintenance. Warning When doing service work on the valve / actuator: Deactivate the pump and turn off the power supply Close the shutoff valves Fully reduce the pressure in the piping system and allow pipes to completely cool down If necessary, disconnect the electrical wires. Before putting the valve into operation again, make certain the actuator is correctly fitted. Stem sealing gland Disposal The glands can be exchanged without removing the valve, provided the pipes are depressurized and cooled off and the stem surface is unharmed. If the stem is damaged in the gland range, replace the entire stem-plug-unit. Contact your local office or branch. Before disposal the valve must be dismantled and separated into its various constituent materials. Legislation may demand special handling of certain components, or it may be sensible from an ecological point of view. Current local legislation must be observed. Warranty The technical data given for these applications is valid only in conjunction with the Siemens actuators as detailed under «Equipment combinations». All terms of the warranty will be invalidated by the use of actuators from other manufacturers. 8/0 Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

9 Technical data Functional data PN class PN 6 to ISO 7268 Working pressure to ISO 7005 within the permissible medium temperature range according to the diagram on page 6 Flow characteristic 0 0 % 0 00 % linear equal percentage; n gl = to VDI / VDE 27 Leakage rate % of k vs value to DIN EN 49 Permissible media: water cooling water, chilled water, low temperature hot water, high temperature hot water, water with anti-freeze; recommendation: water treatment to VDI 205 brine steam saturated steam, super-heated steam dryness at inlet minimum 0.98 heat transfer oils (use only valves with suffix 4) Medium temperature ) water, brine 2) saturated steam superheated steam heat transfer oils max. 50 C (80 C) C (80 C) 80 C 600kPa (6 bar) abs 80 C 600kPa (6 bar) abs permissible temperature and pressure range according to the diagram on page 6 80 C (use only valves with suffix 4) Rangeability S v DN 50 50: >00 (VVF45.49: > 50) minal stroke DN 50: 20 mm DN 65 50: 40 mm Industry standards Pressure Equipment Directive PED 97/2/EC Pressure Accessories as per article, section 2..4 Fluid group 2: DN 50 without CE-marking as per article, section (sound engineering practice) DN category I, with CE-marking DN 50 category II, with CE-marking, test authority number 006 Materials Valve body nodular cast iron EN-GJS Stem stainless steel Plug, seat stainless steel Sealing gland standard version: brass, silicon-free special version: stainless steel Gland materials standard version: EPDM O-rings, silicon-free special version: VVF45 4: PTFE sleeves Dimensions / Weight Refer to «Dimensions» Flange connections to ISO 7005 ) For C use special versions with type suffix 4. 2) Electric stem heating element ASZ6.5 required for media below 0 C. Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products /0

10 Dimensions Dimensions in mm H H2 H B L D4 D K D2 L2 L 440M0 Type DN B D D2 D4 K L L2 L H H2 H kg Ø Ø Ø SKB SKC [kg] VVF VVF (4x) > 67 5 VVF > VVF > 70 0 VVF (8x) > 72 9 VVF > VVF (8x) > DN = minal size H = Total actuator height plus minimum distance to the wall or the ceiling for mounting, connection, operation, maintenance etc. H = Dimension from the pipe centre to install the actuator (upper edge) H2 = Valve in the «Closed» position means that the valve stem is fully extended Spare parts Order numbers for spare parts Sealing gland Set 440Z04 440Z0 Plug with stem, circlip, sealing Valve VVF45 VVF45 4 VVF45, VVF45 4 VVF VVF VVF VVF VVF VVF VVF / Siemens Switzerland Ltd Subject to alteration Building Technologies 2-Port Seat Valves with Flange, PN 6 CMN445en HVAC Products

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