Mixing Valves

Thermostatic steam–water mixers are used to generate hot water in industrial installations where a controlled outlet temperature is required without a separate heat exchanger. Operation is based on direct mixing of steam with water and thermostatic modulation of the mixed outlet temperature, limiting thermal fluctuation at the point of use. Typical applications include washdown stations, equipment cleaning, auxiliary utility networks, steam service installations, and process circuits where direct water heating is acceptable.

This category includes ADCA MX20 and SG20 thermostatic mixers. Selection should be based on steam pressure, water pressure, required flow rate, outlet temperature setpoint, available downstream pressure, steam quality, and safe operating requirements. In these services, upstream strainers should be installed, together with non-return valves to prevent reverse flow of steam or water into the respective supply lines. The steam line should be properly drained, and outlet overheating risk should be evaluated.

The MX20 version has stainless steel construction, 3/4” × 3/4” size, ISO 7 Rp threaded connections, and a maximum operating pressure of 10 bar. The SG20 version is specified in 1/2” size with a maximum operating pressure of 24 bar. During installation, attention should be given to supply pressure stability, differential pressure between steam and water, risk of water hammer, thermal stress in the pipework, and access for periodic cleaning or inspection of the thermostatic element.