The butterfly valve in the chilled water system is a regulating device designed for low-temperature fluid control. Its core functions and characteristics are as follows:
1. Definition and core functions
The chilled water butterfly valve controls the medium flow by rotating the disc-shaped butterfly plate, and achieves precise flow regulation while maintaining the system temperature stable (typical operating temperature range -40℃~+5℃). Its core functions include:
Low-temperature sealing guarantee: EPDM or fluororubber (FKM) valve seat is used to maintain elastic sealing performance under low-temperature conditions;
Fluid resistance optimization: The flow resistance coefficient is ≤0.2 when the butterfly plate is fully open, avoiding increased energy consumption in chilled water transportation;
Pressure fluctuation control: Adapts to PN10-PN25 pressure levels and can withstand pressure shocks in chilled water circulation systems.
2. Structural characteristics and technical parameters
| Components | characteristic |
|---|---|
| Valve body material | 316L stainless steel or low temperature carbon steel (ASTM A352 LCB), low temperature impact toughness ≥27J@-46℃ |
| Butterfly plate design |
Double eccentric structure, equipped with PTFE wear-resistant coating, opening and closing angle error ≤ ± 1°. |
| Sealing components |
Triple sealing structure (metal + elastomer + graphite filler), leakage rate <0.01% |
| Drive mode |
Manual worm gear or electric actuator (IP67 protection class) |
3. Typical application scenarios
central air-conditioning system
Flow control of chiller outlet (DN80-DN400);
Temperature regulation of end air handling unit (AHU).
Industrial cooling system
Circulating water cooling lines for injection moulds;
Liquid cooling unit media distribution for data centre.
4. selection and maintenance of key points
material suitability: long-term contact with glycol solution conditions need to choose 316L stainless steel + Viton combination;
installation specifications: the valve body axis and pipeline centerline deviation should be <0.5mm, to prevent low-temperature deformation leading to leakage; maintenance cycle: every 2 years. maintenance cycle: every 2 years to detect the seal compression permanent deformation, deformation rate> 12% need to be replaced.
The valve type through targeted materials and structural design, in the low temperature environment to achieve high reliability control, is the key regulator of chilled water system.
