Siemens Building Technology 257-02034 Valve Assembly
For contractors servicing terminal units, the Siemens Building Technology 257-02034 is a standard-setting normally open pneumatic valve assembly designed for precision control in low-pressure steam and water applications. This 2-way globe valve features a 1/2 inch NPT female-to-female connection and is built on the rugged Powermite 599 MT Series platform, rated for ANSI Class 250 service. The forged brass body and brass trim provide the durability required for hot or chilled water systems and glycol solutions up to 50% concentration.
The assembly is powered by a 2-inch pneumatic actuator with a 3-8 PSI spring range, ensuring a reliable fail-safe open position. With a 1.0 Cv and a modified equal percentage flow characteristic, this unit delivers linear control even in high-demand environments. Optimized for HVAC terminal unit control like reheat coils and unit conditioners, the Siemens 257-02034 offers a compact 7/32 inch stroke and a high close-off rating of up to 160 PSI, making it a staple for high-performance commercial HVAC systems and secondary loop regulation.
Key Benefits- Precise Flow Control: The modified equal percentage plug design ensures stable modulation for 1.0 Cv terminal unit applications.
- High Pressure Rating: Built with an ANSI Class 250 forged brass body to handle demanding HVAC piping requirements.
- Field Reliability: The 3-8 PSI pneumatic actuator provides consistent spring-return mechanical failsafe operation.
- Broad Media Compatibility: Suitable for control of chilled water, hot water, and low-pressure steam up to 15 PSI.
- Compact Installation: The 1/2" NPT threaded footprint is ideal for tight mechanical rooms and unit ventilators.
What is the fail-safe position for this assembly?
The Siemens 257-02034 is a normally open (NO) assembly, meaning the 3-8 PSI spring will drive the valve to the fully open position upon loss of control air pressure.
Can this valve be used for steam applications?
Yes, this brass-trimmed assembly is rated for low-pressure steam up to 15 PSI. For higher pressure steam, consult technical specs to determine if stainless steel trim is required for your specific installation.
Is this compatible with standard NPT piping?
Correct. It features 1/2" NPT female-by-female internal threads for standard HVAC contractor installation without the need for specialized adapters.
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.
Siemens Building Technology 257-02034 Valve Assembly
For contractors servicing terminal units, the Siemens Building Technology 257-02034 is a standard-setting normally open pneumatic valve assembly designed for precision control in low-pressure steam and water applications. This 2-way globe valve features a 1/2 inch NPT female-to-female connection and is built on the rugged Powermite 599 MT Series platform, rated for ANSI Class 250 service. The forged brass body and brass trim provide the durability required for hot or chilled water systems and glycol solutions up to 50% concentration.
The assembly is powered by a 2-inch pneumatic actuator with a 3-8 PSI spring range, ensuring a reliable fail-safe open position. With a 1.0 Cv and a modified equal percentage flow characteristic, this unit delivers linear control even in high-demand environments. Optimized for HVAC terminal unit control like reheat coils and unit conditioners, the Siemens 257-02034 offers a compact 7/32 inch stroke and a high close-off rating of up to 160 PSI, making it a staple for high-performance commercial HVAC systems and secondary loop regulation.
Key Benefits- Precise Flow Control: The modified equal percentage plug design ensures stable modulation for 1.0 Cv terminal unit applications.
- High Pressure Rating: Built with an ANSI Class 250 forged brass body to handle demanding HVAC piping requirements.
- Field Reliability: The 3-8 PSI pneumatic actuator provides consistent spring-return mechanical failsafe operation.
- Broad Media Compatibility: Suitable for control of chilled water, hot water, and low-pressure steam up to 15 PSI.
- Compact Installation: The 1/2" NPT threaded footprint is ideal for tight mechanical rooms and unit ventilators.
What is the fail-safe position for this assembly?
The Siemens 257-02034 is a normally open (NO) assembly, meaning the 3-8 PSI spring will drive the valve to the fully open position upon loss of control air pressure.
Can this valve be used for steam applications?
Yes, this brass-trimmed assembly is rated for low-pressure steam up to 15 PSI. For higher pressure steam, consult technical specs to determine if stainless steel trim is required for your specific installation.
Is this compatible with standard NPT piping?
Correct. It features 1/2" NPT female-by-female internal threads for standard HVAC contractor installation without the need for specialized adapters.
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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Description
For contractors servicing terminal units, the Siemens Building Technology 257-02034 is a standard-setting normally open pneumatic valve assembly designed for precision control in low-pressure steam and water applications. This 2-way globe valve features a 1/2 inch NPT female-to-female connection and is built on the rugged Powermite 599 MT Series platform, rated for ANSI Class 250 service. The forged brass body and brass trim provide the durability required for hot or chilled water systems and glycol solutions up to 50% concentration.
The assembly is powered by a 2-inch pneumatic actuator with a 3-8 PSI spring range, ensuring a reliable fail-safe open position. With a 1.0 Cv and a modified equal percentage flow characteristic, this unit delivers linear control even in high-demand environments. Optimized for HVAC terminal unit control like reheat coils and unit conditioners, the Siemens 257-02034 offers a compact 7/32 inch stroke and a high close-off rating of up to 160 PSI, making it a staple for high-performance commercial HVAC systems and secondary loop regulation.
Key Benefits- Precise Flow Control: The modified equal percentage plug design ensures stable modulation for 1.0 Cv terminal unit applications.
- High Pressure Rating: Built with an ANSI Class 250 forged brass body to handle demanding HVAC piping requirements.
- Field Reliability: The 3-8 PSI pneumatic actuator provides consistent spring-return mechanical failsafe operation.
- Broad Media Compatibility: Suitable for control of chilled water, hot water, and low-pressure steam up to 15 PSI.
- Compact Installation: The 1/2" NPT threaded footprint is ideal for tight mechanical rooms and unit ventilators.
What is the fail-safe position for this assembly?
The Siemens 257-02034 is a normally open (NO) assembly, meaning the 3-8 PSI spring will drive the valve to the fully open position upon loss of control air pressure.
Can this valve be used for steam applications?
Yes, this brass-trimmed assembly is rated for low-pressure steam up to 15 PSI. For higher pressure steam, consult technical specs to determine if stainless steel trim is required for your specific installation.
Is this compatible with standard NPT piping?
Correct. It features 1/2" NPT female-by-female internal threads for standard HVAC contractor installation without the need for specialized adapters.
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.
