Siemens Building Technology 656-0004 Valve

The Siemens Building Technology 656-0004 Valve is a specialized 1/2-inch normally open pneumatic valve designed for terminal unit applications including convectors, fan coils, and radiation systems. This 2-way globe valve features a 0.9 Cv flow coefficient, engineered to maintain precise control of water or steam in variable pressure environments. Built with a brass body and stainless steel stem, the assembly excels in high-rise building systems due to its dual-sealing packed construction that ensures leak-free performance. The integrated 3 to 8 psi pneumatic actuator allows for linear modulation, ensuring HVAC terminal unit control remains consistent. This compact unit is ideal for restricted cabinet enclosures where space is at a premium. By utilizing a 1/2-inch flare connection, the Siemens Powermite 656-0004 simplifies field installation and maintenance, providing reliable service life for hot or chilled water and steam systems without the need for frequent valve body removal.

• High Close-Off Performance: Engineered for tight shutoff in systems with operating temperatures up to 250°F.
• Precision Throttling: Features modified equal percentage flow characteristics for accurate temperature regulation.
• Durable Construction: Stainless steel trim and brass housing resist friction and corrosion in harsh steam and glycol environments.
• Compact Footprint: Specifically designed for installation within localized HVAC cabinets and small terminal units.
• Rotatable Actuator: The housing can be repositioned to facilitate convenient air line piping from multiple directions.

What is the typical application for the Siemens 656-0004?
This valve is primarily used for individual room control via fan coil units, baseboard radiation, and reheat coils in commercial pneumatic control systems.

Is this valve suitable for high-pressure steam?
Yes, the dual-sealing packed design is specifically rated to handle the steam pressures commonly encountered in high-rise HVAC distributions.

How does the normally open function work during power or air failure?
As a normally open (N.O.) component, the internal spring will return the valve to the fully open position if control air pressure is lost, ensuring continuous flow for safety or freeze protection.

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.