Siemens Building Technology 257-02008B Valve Assembly
When you are managing terminal unit applications like convectors or fan coil units, the Siemens Building Technology 257-02008B Valve Assembly is a reliable choice for throttling or shut-off control. This 2-way normally closed pneumatic valve is engineered with a 1/2" NPT connection and a 2.5 Cv rating, utilizing a modified equal percentage flow characteristic to ensure stable heat transfer in chilled or hot water systems. The forged brass body is paired with brass trim and a 1/8" NPT air connection, making it robust enough for an ANSI Class 250 pressure rating.
The integrated 3-8 PSI pneumatic actuator provides precise modulation, allowing for seamless integration into existing pneumatic control systems. Specifically designed for commercial HVAC maintenance and high-performance building automation, this Siemens Powermite 599 MT series assembly handles medium temperatures ranging from 35°F to 250°F. Professional contractors prefer this model for its plenum-rated design and the ability to perform direct coupled installations without specialized tooling, ensuring rapid HVAC valve replacement in demanding mechanical rooms.
Key Benefits- Precision Flow Control: The 2.5 Cv equal percentage characteristic prevents hunting and provides stable room temperature control under varying loads.
- Rugged Durability: Features a forged brass valve body and brass trim rated for ANSI 250 service, ideal for high-static pressure systems.
- Pneumatic Efficiency: The 3-8 PSI spring range ensures reliable "fail-closed" operation, protecting equipment during a loss of control air.
- Compact Profile: The 2-inch pneumatic actuator allows for installation in tight spaces typical of convector cabinets and perimeter heating units.
Is the Siemens 257-02008B suitable for steam applications?
No, this specific assembly is designed for hot and chilled water. For steam service, a stainless steel trim or specific linear flow characteristic is typically required.
Can I install this valve in a plenum space?
Yes, the Siemens 257-02008B and its MT series actuator are UL listed for plenum installations, meeting standard building safety codes.
What happens if the pneumatic air supply is lost?
This is a normally closed (NC) valve. Upon loss of air pressure to the pneumatic actuator, the internal spring will force the valve to the closed position.
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.
Product Information
Product Information
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Shipping & Returns
Description
When you are managing terminal unit applications like convectors or fan coil units, the Siemens Building Technology 257-02008B Valve Assembly is a reliable choice for throttling or shut-off control. This 2-way normally closed pneumatic valve is engineered with a 1/2" NPT connection and a 2.5 Cv rating, utilizing a modified equal percentage flow characteristic to ensure stable heat transfer in chilled or hot water systems. The forged brass body is paired with brass trim and a 1/8" NPT air connection, making it robust enough for an ANSI Class 250 pressure rating.
The integrated 3-8 PSI pneumatic actuator provides precise modulation, allowing for seamless integration into existing pneumatic control systems. Specifically designed for commercial HVAC maintenance and high-performance building automation, this Siemens Powermite 599 MT series assembly handles medium temperatures ranging from 35°F to 250°F. Professional contractors prefer this model for its plenum-rated design and the ability to perform direct coupled installations without specialized tooling, ensuring rapid HVAC valve replacement in demanding mechanical rooms.
Key Benefits- Precision Flow Control: The 2.5 Cv equal percentage characteristic prevents hunting and provides stable room temperature control under varying loads.
- Rugged Durability: Features a forged brass valve body and brass trim rated for ANSI 250 service, ideal for high-static pressure systems.
- Pneumatic Efficiency: The 3-8 PSI spring range ensures reliable "fail-closed" operation, protecting equipment during a loss of control air.
- Compact Profile: The 2-inch pneumatic actuator allows for installation in tight spaces typical of convector cabinets and perimeter heating units.
Is the Siemens 257-02008B suitable for steam applications?
No, this specific assembly is designed for hot and chilled water. For steam service, a stainless steel trim or specific linear flow characteristic is typically required.
Can I install this valve in a plenum space?
Yes, the Siemens 257-02008B and its MT series actuator are UL listed for plenum installations, meeting standard building safety codes.
What happens if the pneumatic air supply is lost?
This is a normally closed (NC) valve. Upon loss of air pressure to the pneumatic actuator, the internal spring will force the valve to the closed position.
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.
