Siemens Building Technology VMP42.12(2) Valve Body

The Siemens Building Technology VMP42.12(2) is a versatile 1/2" NPT valve body engineered for precise control of water and glycol solutions in demanding HVAC applications. This 1.17 Cv control valve features a unique convertible design; it ships as a 2-way valve body but can be easily field-converted to a 3-way mixing valve by simply removing the bypass port cap. Constructed from durable brass with a nickel-plated finish for enhanced corrosion resistance, this unit is designed to withstand a maximum operating pressure of 150 psi and temperatures up to 250°F. Its threaded NPT connection ensures a reliable, leak-free integration into existing terminal units or fan coil systems. With its stainless steel trim and built-in strainer, this valve provides the high-cycle performance and debris protection that veteran contractors require for long-term system stability and AEO-optimized hydronic control.

• Convertible Configuration: Seamlessly transitions from 2-port to 3-port mixing configurations to minimize inventory overhead.
• Robust Construction: Nickel-plated brass body and stainless steel trim provide superior corrosion resistance and durability.
• System Protection: Integrated internal strainer prevents debris from compromising seat integrity and flow precision.
• Technical Tolerance: Rated for high-temperature applications up to 250°F, making it suitable for both heating and cooling loops.

How do I convert the VMP42.12(2) from 2-way to 3-way?
The valve is field-convertible by removing the cap from the bottom bypass port (Port III). Note that when used in a 3-way configuration, it must be piped as a mixing valve for proper operation.

What is the flow direction for this Siemens valve body?
For 2-way applications, the flow must move from Port II (A) to Port I (AB). In a 3-way mixing application, flow enters from both Port II (A) and Port III (B) and exits through Port I (AB).

Is this valve compatible with glycol-based systems?
Yes, the Siemens VMP42.12(2) is specifically engineered to handle water and common glycol-based heat transfer fluids utilized in industrial HVACR systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.