Modulating Pilot Valve

Product series: M2FP03GX

M2FP03GX 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 requires only supply and connection from the HBLC.

  • 2-port modulating pilot valve with magnetic actuator, PN32, AC 24 V, DC 0...10 V / 4...20 mA / 0...20 Phs to control main valves
  • Hermetically sealed 2-port valve as a control valve for main valves from 2” to 5”.
  • PN32 with threaded connections
  • For use with refrigerants such as R22, R134a, R404A, R407C, R507 and ammonia R717

The Siemens M2FP Series is for capacity requirements of 6 – 354 Kvs [m3 /h]. We recommend Siemens valves for evaporators larger than 150 kw.

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Product features

Short positioning time (approx 1 s)
High resolution
Hermetically sealed
Versatile electrical interface with terminal housing ZM..
Friction free
Robust and maintenance-free





Power supply
Operating voltageAC 24 V +15 % / -10 %
Frequency50...60 Hz
Typical power consumption Pmed5 W
Rated apparent power for transformer selection SNA13 VA
Cable entry2 x Pg11 (ZM101/A, ZM121/A)
Positioning signal - ZM121ADC 4...20 mA
CE conformity2004/108/EC
Housing protection. Upright to horizontalIP54 to EN 60529
Mechanical specifications
Positioning timeApprox. 1 s
MediaRefrigerants (R22, R134a, R404A, R407C, R507 etc.), ammonia (R717)
Medium temperature-40...100 ℃
Position when de-energizedValve stem retracted (valve control path closed)
Mode of operationModulating
Threaded connectionM24 x 1.5 mm

Ordering code

Part no.Kvs [m3/h]QoE [kW]*

Part no. for M2FP

Kvs [m3/h]


Siemens-M2FP/ZM121A *6 - 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


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