Modulating Valve

Capacity requirements: 0,16 - 6,30 Kvs [m3/h]:

Technical data: MVS661

MVS661 is a modulating valve for the connection to the refrigerant level control sensor type HBLC. It can be used for all refrigerants and has a fast reaction time.

The modulating valve require only supply and connection from the HBLC. .

Capacity requirements: 6 - 354 Kvs [m3/h]:

Technical data: M2FP

Modulating pilot valve with magnetic actuator as the controlling element for 2…5“
pilot operated servo valves for modulating control of chillers, or for direct control of low kvs values.
Suitable for use with safety refrigerants such as R22‚ R134a‚ R404A‚ R407C‚ R507
and for ammonia R717. Unsuitable for applications with gas/liquid mixtures.

*We recommend Siemens valves for evaporators larger than 150 kw.

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Product features

High precision and precise regulation.
Precise positioning.
Feed back signal to central panel about valve positioning.
Fast reaction time.
Proven and reliable design.





Mechanical drawings M2FP: 



Power supply
Loop from HBLC contoller4-20 mA
Connection3 x ø20,5 mm
TerminalsScrew terminals max 4 mm2
Positioning4-20 mA
Load500 ohm
Reactiontime1 s
Protection degreeClass III - EN 60730
UL standardUL 873
CSA standardC22.2 No. 24
PN classPN50 - EN 1333
Mechanical specifications
Max. pressure50 bar
Refrigerant temperature-40...+120°C
MountingHorisontal or vertical
Weight5, 17 kg
Protection degreeIP65 - EN 60529
Pipe connectionØ33,7/22,4
Material - liquid partsSteel / CrNi steel
Material - sealingPTFE/CR

Ordering code

Part no.Kvs [m3/h]QoE [kW]
Siemens MVS...0.16N0,1695
Siemens MVS...0.4N0,4245
Siemens MVS...1.0N1610
Siemens MVS...2.5N2,51530
Siemens MVS...6.3N6,33850
Siemens MVS...0.16N-IP0,1695
Siemens MVS...0.4N-IP0,4245
Siemens MVS...1.0N-IP1610
Siemens MVS...2.5N-IP2,51530
Siemens MVS...6.3N-IP6,33850
*IP is with integrated heater
* We recommend using the "Siemens Modulating Valve Selection Program" for calculating valve size [kW], which can be downloaded for free under the "Downloads" tab

Spare parts

Siemens ASR61-IP Replacement electronics for MVS661 with heaterValve insert ASR..N

Additional info

An exchangeable ASR..N valve insert allows for differentkvs-values with the same type of DN25 valve. In the event of service,this insert can also be replaced on the plant

Mechnical spare part no.

Kvs [m3/h]


Siemens ASR0.16N0,1625
Siemens ASR0.4N0,425
Siemens ASR1.0N1,025
Siemens ASR2.5N2,525
Siemens ASR6.3N6,325

Electronic spare part no.


Additional info

Siemens ASR61Replacement electronic part for Siemens MVS661
Siemens ASR61-IPReplacement electronic part for Siemens MVS661-IPWith integrated heating element

Part no. for M2FP

Kvs [m3/h]


Siemens-M2FP/ZM121A6 - 35425
*2- Port modulating pilot valve + terminal house for pilot valve

Spare parts for Siemens-M2FP/ZM121A


Additional info

Siemens M2FP03GX2-Port modulating pilot valve to controlMain valves. PN32, Thread M24x1,5mm
Siemens ZM121/ATerminal housing for pilot valve24V AC supply, 4-20mA regulation


Installation manual (UK) - MVS661 modulating valve

Mounting instruction (UK) - MVS661 modulating valve
Drawing (STEP file) - MVS661 modulating valve

Manual (UK) - M2FP Modulating pilot valve

EU Declaration of Conformity - Siemens MVS 661

Leaflet - MVS661

Leaflet - M2FP


Siemens Refrigeration Valve Selection Program 

*The calculation program for dimensioning of Siemens modulating valves is indicative and developed

by Siemens. HB Products is not responsible for calculations and cannot be held liable for any damages or

other liability arising from calculations from this Siemens Refrigeration Valve Selection Program.

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