Control Valve 3-Way M3F Series | Clorius Controls

Clorius M3F – Three-Way Control Valve Cast Iron

The Clorius M3F is a flanged three-way control valve designed for mixing or diverting flow in hot water, lubricating oil, and other liquid media. It is used with Clorius thermostats or actuators in industrial process control, district heating, central heating systems, and marine applications.

Series Versions

• M3F DN20–DN65: PN16, body EN-GJS-400-15, flanges EN 1092-2 PN16, seats/cone/shaft made of stainless steel.
• M3F DN80–DN150: PN10, body EN-GJS-400-15, seats and cone made of aluminum bronze CuAl10Fe5Ni5, stainless steel shaft, O-ring NBR 90.
• M3F-I DN150: inverted port arrangement for specific piping requirements.

Hydraulic Characteristics

For DN20–DN65, the Kvs is the same for mixing and diverting: DN20 6.3, DN25 10, DN32 16, DN40 25, DN50 38, DN65 63 m³/h. The characteristic is quadratic in the A–AB path and nearly linear in the B–AB path.

For DN80–DN150, the characteristic is nearly linear. Mixing Kvs: 80 / 125 / 215 / 310 m³/h. In diverting, the Kvs reduces to 69 / 108 / 185 / 267 m³/h, and the pressure drop increases by approximately 35%, critical for pump sizing and valve authority.

Port Operation

Port AB / 1 is the common port. Without an actuator, the A–AB path is open and the B–AB path is closed via a spring. With shaft loading, A–AB closes and B–AB opens. With a thermostat V or normal rotation motor, A closes with temperature increase and B opens.

Leakage and Selection

The M3F features two balanced single seats, actuator connection G1B per ISO 228, and leakage ≤0.5% of Kvs per VDI/VDE 2174. It is not used as a tight shut-off valve. Selection is based on Kvs, Δp, PN, temperature, mixing/diverting function, and acceptable internal leakage.