VVF53.. VXF53.. Acvatix™ Valves VVF..,VXF.. Basic Documentation CE1P4030en 12.09.
Siemens Switzerland Ltd. Industry Sector Building Technologies Division Gubelstrasse 22 6301 Zug Switzerland Phone +41 41-724 24 24 www.siemens.com/sbt © 2011 Siemens Switzerland Ltd. Subject to change 2 / 70 Siemens Building Technologies Valves VVF..,VXF.. CE1P4030en 12.09.
Table of contents 1 About this document ..............................................................................5 1.1 Navigation .................................................................................................5 1.2 Revision history.........................................................................................5 1.3 Reference documents ...............................................................................5 1.3.1 2- and 3-port valves with flanged connections ...
2.11 Valve characteristics ...............................................................................35 2.11.1 2-port valves.......................................................................................35 2.11.2 3-port valves.......................................................................................35 2.12 Operating pressure and medium temperature ........................................36 2.12.1 ISO 7005 and EN 1092 – a comparison ............................................36 2.
1 About this document 1.1 Navigation You will find information about a specific valve throughout the document. The structure of chapters 2 to 4 is as follows: 2 Engineering 3 Handling device oriented process oriented 3.1 Mounting and installation 3.2 Commissioning and maintenance 3.3 ... 4 Functions and control assembly oriented 4.1 Selection of acting direction and valve characteristic 4.2 Calibration 4.3 ... 1.2 Revision history Revision First edition Date 12.09.
1.4.2 Copyright This document may be duplicated and distributed only with the express permission of Siemens, and may be passed only to authorized persons or companies with the required technical knowledge. 1.4.3 Quality assurance The document was prepared with great care. Please make sure that you are aware of the latest document revision date.
2 Engineering 2.1 Product description The large-stroke valve line consists of 2-port and 3-port valves. 2.1.1 2-port valves Type of valve Product number High-performance valves for higher medium temperatures VVF43.., VVF53.. Connections Flanged Page A Valve stem 54 B Stem sealing gland 19 C Valve neck 54 D Type plate 8 E1 Flange Connections 55 F1 2.1.
2.1.3 Type plate 1 2 2-port valves 3 4 5 6 7 8 9 10 11 Flow direction for fluids Flow direction for steam Port markings are cast integral Product number Stock number Nominal pressure class Nominal size kvs value Serial number Country of origin CE mark conforming to PED 97/23/EC. Applies only to valves of category I or II conforming to PED 97/23/EC Notified body number for monitoring production centers as per module A1 of PED 97/23/EC.
2.2 Use The valves are used as control or shutoff valves in heating, ventilation and air conditioning plants for the production and distribution of heat or cooling energy, as well as in district heating plants and in steam applications. All 3-port valves can be used as mixing valves (preferred use) or diverting valves. For use in closed or open hydraulic circuits, observe chapter "Cavitation", page 39. 2.2.
2.2.2 Fields of use Fields of use Product number Generation Boiler plants District heating plants Chiller plants 3) Cooling towers Distribution Heating groups Air handling units VVF53.. 2) VVF43.. Type of connection 2-port valves H VXF53.. 1) VXF43.. Version 3-port valves H F F F F ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 1) Version: H = high-performance Type of connection: F = flanged 3) Open circuits 2) 10 / 70 Siemens Building Technologies Valves VVF..,VXF..
2.3 Type summary and equipment combinations 2.3.1 2-port valves with flanged connections Stroke PN 16 1) Actuators 2) SAX.. 2) SKD.. SKB.. SKC.. Data Sheet N4501 N4561 N4564 N4566 20 mm Positioning force 800 N 2) Data Sheet N4404 DN kvs SAX.. Δps Δpmax 2) SKD.. Δps Δpmax 3 -20…220 °C 3) VVF53.15-.. 3) VVF53.15-.. 3) VVF53.20-.. 3) VVF53.25-.. 3) VVF53.32-.. 3) VVF53.40-.. 3) VVF53.50-.. Stock number S55208-.. S55208-.. S55208-.. S55208-.. S55208-.. S55208-.. S55208-..
20 mm Stroke PN 25 1) PN 16 2) Actuators 3) SAX.. 3) SKD.. SKB.. SKC.. Data Sheet N4501 N4561 N4564 N4566 800 N DN kvs 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 20 25 25 25 25 32 40 40 40 40 50 50 65 80 100 125 150 [m /h] 0.16 0.2 0.25 0.32 0.4 0.5 0.63 0.8 1 1.25 1.6 2 2.5 3.2 4 6.3 5 6.3 8 10 16 12.5 16 20 25 31.5 40 63 100 160 250 400 SV 40 mm 1000 N 3) Data Sheet N4405 -20…220 °C VVF53.15-0.16 VVF53.15-0.2 VVF53.15-0.25 VVF53.15-0.32 VVF53.15-0.4 VVF53.15-0.5 VVF53.15-0.63 VVF53.15-0.
Stroke Positioning force Actuators Data Sheet PN 25 1) PN 16 SKD.. SKB.. SKC.. 3) 20 mm 1000 N 40 mm 2800 N 2800 N SKB.. Δps Δpmax SKC.. Δps Δpmax N4561 N4564 N4566 2) 3) Data Sheet N4405 VVF53.. DN 100…220 °C Stock number VVF53.15-0.16 VVF53.15-0.2 VVF53.15-0.25 VVF53.15-0.32 VVF53.15-0.4 VVF53.15-0.5 VVF53.15-0.63 VVF53.15-0.8 VVF53.15-1 VVF53.15-1.25 VVF53.15-1.6 VVF53.15-2 VVF53.15-2.5 VVF53.15-3.2 4) VVF53.15-4 4) VVF53.20-6.3 VVF53.25-5 VVF53.25-6.3 VVF53.25-8 4) VVF53.25-10 4) VVF53.
2.3.2 PN 16 1) Actuators 2) SAX.. 2) SKD.. SKB.. SKC.. 3-port valves with flanged connections Stroke Positioning force Data Sheet N4501 N4561 N4564 N4566 Data Sheet N4404 DN kvs 20 mm 1000 N 800 N SAX.. Δpmax SV 2) SKD.. Δpmax 2) 2800 N 40 mm 2800 N SKB.. Δpmax SKC.. Δpmax [kPa] 3 Stock number -20…220 °C 3) VXF53.15-.. 3) VXF53.20-.. 3) VXF53.25-.. 3) VXF53.32-.. 3) VXF53.40-.. 3) VXF53.50-.. 4) VXF43.65-63 4) VXF43.80-100 4) VXF43.100-160 4) VXF43.125-250 VXF43.
2.3.3 Product number Stock number SAX31.00 S55150-A105 SAX31.03 S55150-A106 SAX61.03 SAX61.03U S55150-A100 S55150-A100-A100 SAX81.00 S55150-A102 SAX81.03 SAX81.03U S55150-A103 S55150-A103-A100 SKD32.21 SKD32.21 SKD32.50 SKD32.50 SKD32.51 SKD32.51 SKD60 SKD60 SKD62 SKD62U SKD62 SKD62U SKD62UA SKD62UA SKD82.50 SKD82.50U SKD82.50 SKD82.50U SKD82.51 SKD82.51U SKD82.51 SKD82.51U SKB32.50 SKB32.50 SKB32.51 SKB32.51 SKB60 SKB60 SKB62 SKB62U SKB62 SKB62U SKB62UA SKB62UA SKB82.
2.4 Ordering Product number VVF53.15-0.16 ASZ6.6 - Example Stock number S55208-V100 S55845-Z108 4 284 8806 0 Description 2-port valve Stem heating element Stem sealing gland EPDM Quantity 1 1 1 Delivery Actuator, valve and accessories are packed and supplied as separate items. Note Counter-flanges, bolts and gaskets must be provided on site. Product number 2.5 Accessories 2.5.1 Electrical accessories Stock no. Description Note ASZ6.5 ASZ6.
2.5.2 Product number ASK50 ASK51 Mechanical accessories Mechanical stroke inverter Stock number Description Valves DN SAX.. SKD.. SKB.. SKC.. ASK50 Mechanical change of acting direction for valves with 20 mm stroke 0% stroke of the actuator corresponds to 100% stroke of the valve To be fitted between valve and actuator V..F53..
2.6 Product replacement The valves covered by this document replace the valves of the VVF../VXF.. lines that have been produced by Siemens, Landis & Staefa and Landis & Gyr since 1974. For most types of valves operating in the field, a one-to-one replacement is available. This does not apply to a small number of special valves that were marketed in certain regions. If there is a need to replace such valves, please contact your Siemens branch office.
2.6.2 VXF41.. VXF41..4 VXF41.49.. VXF41.494.. VXF41.50.. VXF41.504.. VXF41.. VXF41..4 3-port valves 3-port valves with flanged connections Product DN number 15 VXF41..5 25 40 VXF41.495.. 50 VXF41.505.. 65 80 VXF41..5 100 125 150 1) Adapter ALF41B15 ALF41B25 ALF41B40 ALF41B50 ALF41B50 ALF41B65 ALF41B80 ALF41B100 ALF41B125 ALF41B150 Stem 1) coupling 4 178 5649 8 4 178 5649 8 4 178 5649 8 4 178 5649 8 4 178 5649 8 Replacement Product DN number 15 VXF53.. 25 40 1) VXF53.50.. 50 VXF53.50.. 65 80 VXF43.
2.7 Stem sealing gland Spare parts Product number DN Comments Stock number 2-port valves (high-performance) VVF53.. DN 15…150 VVF43.. DN 65…150 74 284 0061 0 - 4 284 8806 0 For medium temperatures below -5 °C 74 284 0061 0 - 4 284 8806 0 For medium temperatures below -5 °C 3-port valves (high-performance) 2-port valves VVF.. Spare parts for expired product lines VXF53.. DN 15…150 VXF43..
2.8 Valve sizing for fluids (water, heat transfer oil) 2.8.1 Procedure for valve sizing Essential values and formulas required for valve sizing: Sizing and selection of valves and actuators 1 2 Determine the basic hydraulic circuit Determine ΔpVR or ΔpMV One of the factors that determines control stability is the valve authority PV.
2.8.2 Fluids Flow chart Kinematic viscosity υ < 10 mm2/s 22 / 70 Siemens Building Technologies Valves VVF..,VXF.. Engineering CE1P4030en 12.09.
2.8.3 Impact of fluid properties on valve sizing Valves are sized based on the volumetric flow passing through them. The most important characteristic of a valve is its kvs value. Since this value is determined with water at a temperature of +5…30 °C and a differential pressure Δp of 100 kPa (1 bar), additional influencing factors must be taken into consideration if the properties of the medium passing through the valve are different.
The specific heat capacity of fluids is specified in trade literature. For mixtures, the specific heat capacity c is calculated on the basis of the mixture’s mass proportions m1 and m2: c Gemisch m1 c 1 m 2 c 2 m1 m 2 In the case of heating applications, the specific heat capacity c1 or c2 at the highest temperature must be used, and in the case of cooling applications that at the lowest temperature. 2.8.3.
Kinematic viscosity 2 [mm /s] 2000 1500 1000 800 600 400 300 250 200 150 100 80 Correction factor FR for different kinematic viscosities ν 1) Correction factor FR 0.52 0.53 0.55 0.56 0.57 0.60 0.61 0.62 0.64 0.70 0.69 0.70 Kinematic viscosity 2 [mm /s] 60 40 30 25 20 15 10 8 6 4 3 Correction factor FR 0.73 0.77 0.8 0.82 0.83 0.86 0.90 1) (0.93) 1) (0.94) 1) (0.95) 1) (0.97) 2 Impact in the case of kinematic viscosities up to 10 mm /s is negligible 2.8.
SV k vs k vr For more detailed information on the subject, refer to the brochure "Hydraulics in building systems" (ordering no. 0-91917-en). 2.9 Sizing valves for steam Since steam is compressible, valve sizing for steam must be based on other criteria. The most important characteristic of compressible flow is that the speed of flow in the throttling section can only increase up to the speed of sound.
Note Notes on the supercritical range Subcritical < 42% Supercritical ≥ 42% When there is a pressure ratio (p1 – p3) / p1 >0.42, the flow passing through the narrowest section of the valve reaches the speed of sound. This can lead to higher noise levels. A throttling system operating at a lower noise level (multistage pressure reduction, damping throttle by the outlet) alleviates the problem.
Water vapor table for the saturated state (pressure table) Water vapor table Pressure p [kPa] Temperature p [bar] T [°C] Spec. volume water V' 3 [dm /kg] Spec. volume steam V'' 3 [m /kg] Density steam Enthalpy water ρ'' 3] [kg/m h' [kJ/kg] Enthalpy steam h'' [kJ/kg] Heat of vaporization r [kJ/kg] 1 0.010 6.9808 1.0001 129.20 0.007739 29.34 2514.1 2485.0 2 0.020 17.513 1.0012 67.01 0.01492 73.46 2533.6 2460.2 3 0.030 24.100 1.0027 45.67 0.02190 101.00 2545.6 2444.
2.10 Calculation examples for water, heat transfer oil and steam 2.10.
8 Check the valve authority PV (control stability) Check PV using the resulting differential pressure ΔpV100: First kvs value: PV p V100 22.3 kPa 0.66 p VR 34 kPa Second kvs value: PV p V100 14 kPa 0.
6 Check the resulting differential pressure ΔpV100 V p V100 100 100 k vs 7 Select suitable line of valves 2 2 3 100 4 m / h 16 kPa 10 m 3 / h 2-port valve (resulting from the basic hydraulic circuit) Flanged (specified by the planner) PN class 16 (specified by the planner) Nominal size DN (resulting from selected valve) Maximum medium temperature: 60 °C Type of medium: Water Selection: VXF53.
Plant data Consumer: Differential pressure ∆pVR: Flow temperature TVL: Return temperature TRL: Required capacity Q100: Basic hydraulic circuit: Operating data Controlled mode when heated up Heating up mode Required capacity Q Q100 = 55 kW Q is undefined Temperature spread ΔT 50 K - Determine the volumetric flow V100 Q 100 3600 V 100 c T - V 100 Air-heat transfer oil heat exchanger 50 kPa (0.5 bar) 280 °C 230 °C 55 kW Throttling circuit 55 kW 3600 2.
2.10.4 Example for steam As outlined in chapter "2.9 Sizing valves for steam", page 26, it must be determined first whether a supercritical or subcritical pressure ratio exists in the plant. Example 1: By way of calculation Saturated steam Prepressure p1 Steam mass flow m Given Required Solution = 151.
Example 3: Superheated steam Example 2: Saturated steam 34 / 70 Siemens Building Technologies Valves VVF..,VXF.. Engineering CE1P4030en 12.09.
2.11 Valve characteristics 2.11.1 2-port valves Flow rate kv / kvs 0…30%: Linear 30…100%: Equal-percentage ngl = 3 as per VDI / VDE 2173 For certain valve lines and high kvs values, the valve characteristic is optimized for maximum volumetric flow kV100. For valves: VVF43.125-250 VVF43.150-400 VVF53.125-250 VVF53.150-400 Flow rate kv / kvs Stroke H / H100 0…100%: Linear Stroke H / H100 3-port valves Throughport A-AB 0...30%: Linear 30...
2.12 Operating pressure and medium temperature 2.12.1 ISO 7005 and EN 1092 – a comparison ISO 7005 and EN 1092 cover PN-classified, round flanges for pipes, valves, plain fittings and accessories, plus their dimensions and tolerances, categorized according to different types of materials. Both standards also contain the assignment of pressures and medium temperatures. The connecting dimensions, flange and face types plus descriptions conform to the relevant ISO 7005 standards.
Fluids with V..F43.. Operating pressure [bar] 2.12.2 PN 16 valves with flanged connections 16 15 14 13 12 1 0 -20 0 20 80 100 120 140 160 180 200 220 240 Medium temperature [°C] Curve for saturated steam; steam forms below this line Operating pressure according to EN 1092, valid for 2-port valves with blank flange Operating pressure and operating temperatures as per ISO 7005, EN 1092 and EN 12284 Saturated steam Superheated steam with VVF43.. V..F53..
2.12.3 Operating pressure [bar] Fluids V..F53.. PN 25 valves with flanged connections 25 24 23 22 21 20 19 18 1 0 -20 -10 0 20 80 100 120 140 160 180 200 220 240 Medium temperature [°C] Curve for saturated steam; steam forms below this line Operating pressure according to EN 1092, valid for 2-port valves with blank flange Operating pressure and operating temperatures as per ISO 7005, EN 1092 and EN 12284 Saturated steam Superheated steam VVF53..
2.13 Cavitation Due to high speeds of the medium in the narrowest section of the valve, local underpressure occurs (p2). If this pressure drops below the medium’s boiling pressure, cavitation occurs (steam bubbles), possibly leading to material removal (abrasion). Also, when cavitation sets in, the noise level increases abruptly. Cavitation can be avoided by limiting the pressure differential across the valve as a function of the medium temperature and the prepressure.
Example for cold water Spring water cooling as an example for avoiding cavitation: Cold water = 12 °C p1 = 500 kPa (5 bar) p4 = 100 kPa (1 bar) (atmospheric pressure) pmax = 300 kPa (3 bar) p3-3’ = 20 kPa (0.2 bar) pD (throttle) = 80 kPa (0.8 bar) p3’ = pressure downstream from the consumer in kPa Note To avoid cavitation in the case of cold water circuits, it must also be made certain that there is sufficient static counter-pressure at the valve’s outlet.
Recommendation To prevent boiler scale and damage resulting from corrosion, the water quality in open or closed plants must be checked at regular intervals. The plant record must always be kept up to date. 2.14.2 Note Water with antifreeze For water with antifreeze, such as ethylene glycol or propylene glycol, the supplierspecific values for the density ρ, the specific heat capacity c, and the kinematic viscosity ν are to be determined by way of concentration and medium temperature.
2.14.3 Note Deionized, demineralized water and super-clean water These media have an impact on valve selection (material of O-rings, gaskets, plug/seat, and valve body). Compatibility must be checked.
Refer to chapter "2.8.3 Impact of fluid properties on valve sizing", page 23. Types of heat transfer oil Planning Install a strainer (dirt trap). Installation and commissioning The company making the installation is responsible for the quality of the media used Before filling a hydraulic HVAC circuit with a medium, the installer must observe the supplier’s specification.
2.15.2 Avoiding flow noise To reduce flow noise, abrupt reductions in pipe diameters, tight pipe bends, sharp edges or reductions in the vicinity of valves should be avoided. A settling path should be provided. Recommendation: L ≥ 10 x DN, at least 0,4 m Also, the flow must be free from cavitation (refer to Cavitation page 39). 2.15.
Welded elbows. 2.15.4 Thermal insulation Insulated pipes and valves save energy. Actuators must never be insulated. This is to make certain that heat produced by the actuator can be dissipated, thus preventing overheating.
2.16 Warranty The engineering data listed in chapter "Type summary and equipment combinations" on page 11 are ensured only when the valves are used in connection with the specified Siemens actuators. Note If the valves are used in combination with actuators supplied by thirds, proper functioning must be ensured by the user himself and Siemens Building Technologies will assume no liability. 46 / 70 Siemens Building Technologies Valves VVF..,VXF.. Engineering CE1P4030en 12.09.
Note 3 Handling 3.1 Mounting and installation The valves must be installed free from distortion: 3.1.1 Mounting positions Indoors 1) Outdoors 1) Only in combination with weather shield ASK39.1 and actuators SAX.. Mounting positions apply to both 2- and 3-port valves. 3.1.2 Direction of flow for fluids and steam For general illustration and further details, refer to chapter "4.3 Technical and mechanical design", page 53. 2-port valves Steam Fluids VVF43.., VVF53..
3-port valves Fluids Mixing valve (preferred use) 3.1.3 Diverting valve Flanges To ensure that flanges are correctly connected, the nominal, maximum and minimum tightening torques must be observed. They depend on the strength and size of the bolts and nuts, the material of the flanges, the PN class, the flange gaskets used and the medium in the hydraulic system. The tightening torques also depend on the specification of the gasket supplier and must be observed, using a torque wrench.
1 to 8 = order for tightening the bolts M = tightening torque Notes: • Too low or too high tightening torques can cause leakage at the flange connections or even lead to broken flanges • Observe the following table "Guide values for tightening torques", page 49 5. When the operating temperature is reached, retighten the bolts. Guide values for tightening torques DN 15 20 25 32 Max.
3.1.4 Stem heating element ASZ6.6 Scope of delivery 1 Stem heating element ASZ6.6 1 screw M4 x 30 mm including nut To fit the stem heating element, stroke actuator and valve must be assembled. The stem heating element is powered separately. Special notes on mounting Prior to mounting, check the following: 1. Actuator and Siemens valve are assembled. 2. Observe compatibility and choice of combinations. 1 10 mm 14 mm 3 Note Valve lines V..F43/53..
3.2 Commissioning and maintenance 3.2.1 Commissioning The valve may be put into operation only if actuator and valve are correctly assembled. Note Ensure that actuator stem and valve stem are rigidly connected in all positions. Function check Valve Throughport AAB Bypass BAB Valve stem extends Closes Opens Valve stem retracts Opens Closes 3.2.2 Maintenance The valves are maintenance-free. 3.
4 Functions and control 4.1 Selection of acting direction and valve characteristic The valve’s characteristic and acting direction (push to open, pull to open, normally open, normally closed) have an impact on the acting direction and valve characteristic selected with the actuator’s DIL switches as well as on the required function in the event of a power failure (actuator with or without spring return function).
4.2 Calibration Calibration must be performed when valve and actuator are correctly assembled. 4.3 Technical and mechanical design The illustrations below only show the valves’ basic design; constructional features, such as the shape of plugs, may differ.
4.3.1 Plug stop The built-in plug stop … supports secure guidance of the plug in all stroke positions, prevents the head of the stem from immersing into the sealing gland, thus avoiding damage to the seal, prevents loss of plug as long as no actuator is fitted. 4.3.2 Valve stem, valve neck, coupling The diameter of the valve stem is 10 mm with all types of valves The same valve stem design ensures compatibility with the actuators 1 2 3 4 4.3.
4.3.5 Flange types Flanges, flange dimensions and flange connections conform to ISO 7005 and EN 1092 respectively. Valve types 2-port valves 3-port valves Flange type Type 21 (integral flange) as per ISO 7005 is an integral component of a pressure device. VVF.. VXF.. Type B (raised face) Type B1 Type of flange and flange face The illustration shows the transition from the flange to the valve body of the V..F..
5 Function data Technical data V..F43.. V..F53..
Environmental conditions Operation Class Temperature Rel. humidity Storage Class Temperature Rel. humidity Transport Standards Class Temperature Rel.
6 Dimensions Dimensions in mm, weight in kg Note VVF43.. Product number VVF43.. B DN 65 80 100 125 150 22.1 28.1 34.1 46.6 67.5 ØD Ø D1 Ø D2 L1 L2 L3 ØK H1 H2 17 17 17 17 17 185 200 220 250 284 118 132 156 184 211 19 (4x) 19 (8x) 19 (8x) 19 (8x) 23 (8x) 290 310 350 400 480 145 155 175 200 240 178 190 206 233 275,5 145 160 180 210 240 115 115 146 159 186.5 231,5 231,5 262,5 275,5 303 B ØD Ø D1 Ø D2 L1 L2 L3 ØK H1 H2 SAX.. - SKD.. - H SKB.. - SKC..
VXF43.. Product number VXF43.. B DN 65 80 100 125 150 17.1 21.2 27.1 37.1 54.5 ØD Ø D1 Ø D2 L1 L2 L3 ØK H1 H2 17 17 17 17 17 185 200 220 250 284 118 132 156 184 211 19 (4x) 19 (8x) 19 (8x) 19 (8x) 23 (8x) 290 310 350 400 480 145 155 175 200 240 145 155 175 200 240 145 160 180 210 240 115 115 146 159 186.5 231.5 231.5 262.5 275.5 303 B ØD Ø D1 Ø D2 L1 L2 L3 ØK H1 H2 SAX.. - SKD.. - H SKB.. - SKC.. 690 690 721 734 762 SAX.. 505 505 505 502 502 542 - SKD..
7 VVF.. Revision numbers Product number VVF43.65-50 VVF43.65-63 VVF43.80-80 VVF43.80-100 VVF43.100-125 VVF43.100-160 VVF43.125-200 VVF43.125-250 VVF43.150-315 VVF43.150-400 - VXF.. Product number VXF43.65-63 VXF43.80-100 VXF43.100-160 VXF43.125-250 VXF43.150-400 - Valid from rev. no. ..A ..A ..A ..A ..A ..A ..A ..A ..A ..A Valid from rev. no. ..A ..A ..A ..A ..A Product number VVF53.15-0.16 VVF53.15-0.2 VVF53.15-0.25 VVF53.15-0.32 VVF53.15-0.4 VVF53.15-0.5 VVF53.15-0.63 VVF53.15-0.8 VVF53.15-1 VVF53.
8 Addendum 8.1.
8.1.
8.1.4 Hydraulics-related glossary Film temperature Temperature of the valve surfaces that are in contact with the heat transfer oil at which the oil starts to disintegrate Cavitation Due to high speeds of the medium in the narrowest section of the valve, local underpressure occurs. If this pressure drops below the medium’s boiling pressure, cavitation occurs (steam bubbles), possibly leading to material removal (abrasion). Also, when cavitation starts, the noise level increases abruptly.
8.1.
Supplier Product number Basic medium BASF Glythermin® NF www.basf.
Supplier Glykol & Sole GmbH Product number Basic medium Tyfocor Temperature range of medium Usage Clear, colorless, faint odour liquid, based on ethylene glycol.
Supplier Product number Basic medium Temper Technology Temper Synthetic and homogenized, glycol- Ready-to-use mixtures free solutions on the basis of salts; suitable for temperatures from -10 to -50 °C; colorless to slightly yellowish; contain no amines or nitrites, but additives to support protection against corrosion and to improve lubrication www.temper.se/Temper_ (eng)/Temper/Download _information/Temper_DX NI-2251_.
Index 2-port valves product description .............................................. 7 valve characteristics .......................................... 35 with flanged connections ................................... 11 3-port valves product description .............................................. 7 valve characteristics .......................................... 35 with flanged connections ................................... 14 Abbreviations ........................................................
/ 70 Siemens Building Technologies Valves VVF..,VXF.. Index CE1P4030en 12.09.
Siemens Switzerland Ltd. Building Technologies Group International Headquarters Gubelstrasse 22 CH-6301 Zug Phone +41 41-724 24 24 Fax +41 41-724 35 22 www.siemens.com/sbt © 2011 Siemens Switzerland Ltd. Subject to change 70 / 70 Siemens Building Technologies Valves VVF..,VXF.. Index CE1P4030en 12.09.
