ACVATIX™ 2-port control ball valve & actuators, PN 16, with internally threaded connection MDB461..AI, MLB461..AI For use in heating, ventilation, and air conditioning plants as control or shutoff valve. In closed circuits. ● ● ● ● ● ● ● A6V12170259_en--_a 2021-05-26 Ball valve body made of brass, ball and stem made of stainless steel DN 15...50 kvs 6.3...
Features ● ● ● Moderately price: Optimized flow rates mean smaller ball valves can be selected. Low torque means you can combine them with small, less expensive rotary actuators. High life expectancy: Maintenance-free construction, also thanks to low friction stem and polished ball made of stainless steel. Simple mounting: The brackets, pre-mounted on the actuators, means you can mount them on the ball valves without tools.
Sizing Flow diagram: Δpmax for MDB461..AI, MLB461..
Ball valve characteristic curve Flow rate kv / kvs Rotational angle Flow characteristics 0…100 % -> A ─ AB equal percentage, ngl = 3 per VDI / VDE 2173 Cavitation Cavitation increases wear and tear of the ball and seat and results in unwanted noise. Cavitation can be prevented by not exceeding the differential pressures as per the flow diagram and maintaining the static pressures depicted below.
Operating pressure and operating temperature Liquids: Operating pressure [bar] Operating temperature [°C] Operating pressure and medium temperature per IS0 7005 (Observe all local and applicable laws). Actuator function Type Control type Modulating control Rotary direction Clockwise or counter-clockwise direction depends.. ..
Type summary DN kVS [m3/h] ∆pmax [kPa] ∆pS Operating voltage [kPa] MDB461.15-6.3AI S55310-M113 15 6.3 350 1400 MDB461.20-10AI S55310-M114 20 10 350 1400 MDB461.25-16AI S55310-M115 25 16 350 1400 MLB461.32-25AI S55310-M116 32 25 350 1000 MLB461.40-40AI S55310-M117 40 40 350 800 MLB461.50-63AI S55310-M118 50 63 350 600 Type Stock number AC 24 V Positioning Spring signal time return DC 0...
Notes Safety DANGER There is a risk to operating personnel and device when working on the unit Failure to comply with these safety notes can result in personal injury and damage to property from pipe pressure, electrical voltage, or device in operation. Note the following when servicing a ball valve/rotary actuator: ● ● ● ● ● Switch off both pump and operating voltage. Close shutoff valves. Release pressure in the pipes and allow them to cool down completely.
Pipe connection Avoid leakage: ● Install fittings as per ISO 7-1. Ball valves (internal threading) = "Rp"; Piping (external threading) = "R". ● Do not use too much hemp or PTFE tape. ● Do not tighten pipe threading to the very end. ● Place the pliers/wrench on the ball valve union nut that is closer to the pipe to be tightened or loosened. Flow direction Make sure that the valve is mounted in the proper flow direction. A symbol the ball valve body: Ball valve M..B461..
Technical data Functional valve data PN class PN 16 per EN1333 Operating pressure Per ISO 7005 within the permissible media temperature as per Operating pressure and operating temperature Ball valve characteristic curve Through-port: 0…100 % Equal percentage, ngl = 3 per VDI / VDE 2173 Leakage through-port <0.01 % of Kvs value Permissible media Chilled water, low temperature hot water, hot water, water with antifreeze.
Standards, directives and approvals (For ball valve) Pressure Equipment Directive 2014/68/EU Pressure accessories Range: Article 1, para. 1 Definition: Article 2, para. 5 Without CE marking as per article 4, para. 3 (generally applicable engineering practice) 2) Fluid group 2 Environmental compatibility Environmental Declaration A5W001536771) contains data on environmental-compatible product design and assessment (RoHS compliance, compositions, packaging, environmental benefits and disposal).
Dimensions Siemens Smart Infrastructure DN = Nominal size H = Total height of actuator plus minimum mounting distance to wall or ceiling, for mounting, connection, operation, maintenance, etc. H1 = Dimension from the pipe to the center to install actuator (upper edge) A C D Rp L1 L2 L3 H1 H kg [mm] [mm] [Inch] [mm] [mm] [mm] [mm] [mm] [kg] 26 29 73.8 Rp ½ 30 59.5 97 138 87.5 31.5 35.1 73.8 Rp ¾ 31 62.5 97 142 87.5 38.5 43.5 73.8 Rp 1 38.
Revision numbers Type Valid from rev. no. MDB461.15-6.3AI ..A MDB461.20-10AI ..A MDB461.25-16AI ..A MLB461.32-25AI ..A MLB461.40-40AI ..A MLB461.50-63AI ..A Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58-724 24 24 www.siemens.
