Siemens Building Technology 257-02056 Valve Assembly
The Siemens 257-02056 is a professional-grade 2-way normally open pneumatic valve assembly engineered for precise proportional control in heating and cooling applications. This 1/2-inch NPT x Union Male unit features a forged brass body and stainless steel trim, ensuring high durability and resistance to scaling in demanding hydronic systems. With a 2.5 Cv rating and equal percentage flow characteristic, it provides stabilized heat output even under fluctuating pressure differentials. The integrated pneumatic actuator operates on a 3-8 psi spring range, allowing for seamless integration with existing building automation systems. Designed for HVAC terminal unit control, this assembly simplifies field installation while maintaining tight shut-off integrity. Contractors typically specify this model for chilled water systems or hot water flow control where reliable pneumatic valve modulation is required for optimal zone temperature management.
Key Benefits for Technicians
- Equal Percentage Flow: Delivers linear heat transfer for more stable room temperature control.
- Stainless Steel Trim: Increases service life and prevents seat erosion in high-cycle environments.
- Union Male Connection: Simplifies valve replacement and maintenance in tight mechanical spaces.
- Normally Open Fail-Safe: Ensures flow continues during pneumatic signal loss to prevent system freezing.
- Field-Proven Reliability: The 3-8 psi spring range provides predictable response times for precise load matching.
Common Questions for Siemens 257-02056
How do I confirm the flow direction for this valve?
The valve body features a directional arrow; always install with the flow following the arrow to ensure the equal percentage flow characteristic functions correctly and to prevent water hammer.
Can this valve be used for steam applications?
This specific 257-02056 assembly is optimized for water and glycol solutions. For low-pressure steam, verify the temperature rating against the specific media requirements before installation.
What is the maximum pressure rating for the actuator?
While the nominal spring range is 3-8 psi, the actuator casing is designed to handle standard control pressures up to 30 psi. Always use a filtered, dry air supply to prevent diaphragm damage.
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 257-02056 Valve Assembly
The Siemens 257-02056 is a professional-grade 2-way normally open pneumatic valve assembly engineered for precise proportional control in heating and cooling applications. This 1/2-inch NPT x Union Male unit features a forged brass body and stainless steel trim, ensuring high durability and resistance to scaling in demanding hydronic systems. With a 2.5 Cv rating and equal percentage flow characteristic, it provides stabilized heat output even under fluctuating pressure differentials. The integrated pneumatic actuator operates on a 3-8 psi spring range, allowing for seamless integration with existing building automation systems. Designed for HVAC terminal unit control, this assembly simplifies field installation while maintaining tight shut-off integrity. Contractors typically specify this model for chilled water systems or hot water flow control where reliable pneumatic valve modulation is required for optimal zone temperature management.
Key Benefits for Technicians
- Equal Percentage Flow: Delivers linear heat transfer for more stable room temperature control.
- Stainless Steel Trim: Increases service life and prevents seat erosion in high-cycle environments.
- Union Male Connection: Simplifies valve replacement and maintenance in tight mechanical spaces.
- Normally Open Fail-Safe: Ensures flow continues during pneumatic signal loss to prevent system freezing.
- Field-Proven Reliability: The 3-8 psi spring range provides predictable response times for precise load matching.
Common Questions for Siemens 257-02056
How do I confirm the flow direction for this valve?
The valve body features a directional arrow; always install with the flow following the arrow to ensure the equal percentage flow characteristic functions correctly and to prevent water hammer.
Can this valve be used for steam applications?
This specific 257-02056 assembly is optimized for water and glycol solutions. For low-pressure steam, verify the temperature rating against the specific media requirements before installation.
What is the maximum pressure rating for the actuator?
While the nominal spring range is 3-8 psi, the actuator casing is designed to handle standard control pressures up to 30 psi. Always use a filtered, dry air supply to prevent diaphragm damage.
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
Shipping & Returns
Shipping & Returns
Description
The Siemens 257-02056 is a professional-grade 2-way normally open pneumatic valve assembly engineered for precise proportional control in heating and cooling applications. This 1/2-inch NPT x Union Male unit features a forged brass body and stainless steel trim, ensuring high durability and resistance to scaling in demanding hydronic systems. With a 2.5 Cv rating and equal percentage flow characteristic, it provides stabilized heat output even under fluctuating pressure differentials. The integrated pneumatic actuator operates on a 3-8 psi spring range, allowing for seamless integration with existing building automation systems. Designed for HVAC terminal unit control, this assembly simplifies field installation while maintaining tight shut-off integrity. Contractors typically specify this model for chilled water systems or hot water flow control where reliable pneumatic valve modulation is required for optimal zone temperature management.
Key Benefits for Technicians
- Equal Percentage Flow: Delivers linear heat transfer for more stable room temperature control.
- Stainless Steel Trim: Increases service life and prevents seat erosion in high-cycle environments.
- Union Male Connection: Simplifies valve replacement and maintenance in tight mechanical spaces.
- Normally Open Fail-Safe: Ensures flow continues during pneumatic signal loss to prevent system freezing.
- Field-Proven Reliability: The 3-8 psi spring range provides predictable response times for precise load matching.
Common Questions for Siemens 257-02056
How do I confirm the flow direction for this valve?
The valve body features a directional arrow; always install with the flow following the arrow to ensure the equal percentage flow characteristic functions correctly and to prevent water hammer.
Can this valve be used for steam applications?
This specific 257-02056 assembly is optimized for water and glycol solutions. For low-pressure steam, verify the temperature rating against the specific media requirements before installation.
What is the maximum pressure rating for the actuator?
While the nominal spring range is 3-8 psi, the actuator casing is designed to handle standard control pressures up to 30 psi. Always use a filtered, dry air supply to prevent diaphragm damage.
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.
