Siemens Building Technology 257-02052 Powermite 599 MT Series 2-Way Normally Open Pneumatic Valve Assembly 1/2" FxUM SS Trim 1.0 Cv 3-8 psi

The Siemens Building Technology 257-02052 is a Powermite 599 MT Series ANSI Class 250 two-way pneumatic valve and actuator assembly. It features a 1/2-inch Female NPT by Union Male (FxUM) connection, a normally open (NO) configuration, stainless steel (SS) trim, a 1.0 Cv flow coefficient, and a 3–8 psi spring range with a 2-inch MT Series pneumatic actuator.

Key Features:

• Valve Type: 2-Way, Normally Open (NO), single-seated globe valve
• Connection: 1/2" Female NPT × Union Male (FxUM)
• Trim: Stainless steel — suitable for steam service up to 15 psi and hot or chilled water
• Flow Coefficient: 1.0 Cv
• Actuator: 2-inch MT Series pneumatic spring return actuator
• Spring Range: 3–8 psi (21–55 kPa)
• ANSI Leakage Class: Class IV (0.01% of Cv)
• ANSI Body Rating: Class 250
• Actuator Stroke: 7/32 inch (5.5 mm)
• Minimum Actuator Force: 67 lbs (300 N)
• Compatible with any Powermite MT Series pneumatic or electronic actuator
• Easily field-replaceable actuator for quick on-site repair
• Valve and actuator can be installed in any position from vertical to horizontal

The Powermite 599 MT Series valve assembly provides proportional control of hot or chilled water, water-glycol solutions up to 50%, and low-pressure steam systems. The stainless steel trim makes this assembly well-suited for steam service applications. The direct-coupled universal bonnet design and field-replaceable actuator simplify maintenance without requiring system shutdown.