What Are Butterfly Valves?
In HVAC and plumbing systems, butterfly valves are common flow control devices that use a
rotating disc to regulate or stop fluid flow. They are compact, lightweight, and capable of
handling large volumes efficiently. The disc inside the valve rotates 90 degrees to move from
fully open to fully closed, giving the valve its “butterfly” name.
Key Advantages of Butterfly Valves
Butterfly valves are ideal for applications that need reliable shut-off and flow regulation without
the bulk of larger valves. They are particularly effective in large-diameter piping, offering
minimal pressure drop and reduced weight. With the right actuator, they can support on/off, 3-
point, or modulating control—making them perfect for chilled water, hot water, and condenser
water systems.
Butterfly vs. Ball Valves: Which to Choose?
While both valves operate with a quarter-turn, butterfly valves are generally lighter, more
compact, and cost-effective in larger sizes. Ball valves are more suitable for smaller, localized
applications, whereas butterfly valves excel in 4″ or larger pipes where cost, space, and
modulating capability are key considerations.
Butterfly vs. Gate Valves: Faster and More Reliable
Gate valves are slower to operate and can experience maintenance issues due to sediment
buildup. Butterfly valves actuate quickly with a 90-degree turn, take up less space, and provide
reliable sealing. For frequent operation or remote control, butterfly valves are often the superior
choice.
Butterfly vs. Globe Valves: Efficient Flow Control
Globe valves offer precise control but can create high pressure drop and require large, heavy
installations. Butterfly valves, paired with the right actuators, provide precise linear or equal
percentage flow control while minimizing space and pressure loss, making them ideal for large
HVAC systems.
Why Choose Siral Butterfly Valves?
Siral valves are designed specifically for HVAC systems, offering a combination of efficiency,
smart design, and long-term reliability:
Patent-pending self-adjusting end stop algorithm ensures zero leakage at up to 200 psi.
Brushless DC motor actuators reduce energy use by up to 80%.
Integrated processors deliver precise flow control.
Proven in high-flow applications with a five-year warranty.
Energy Savings With Siral Valves
Siral valves minimize wasted energy through smart torque management. By delivering only the
necessary torque, they reduce energy consumption, extend actuator life, and ensure consistent
performance, contributing to overall system efficiency.
Built to Withstand Tough Conditions
Siral actuators meet NEMA 4X standards, resisting dust, rain, and harsh environments. Valve
bodies are made of ductile iron, and internal discs are stainless steel, ensuring strength, corrosion
resistance, and long-term durability, even in rooftop or damp mechanical spaces.
Precise Flow Control Made Simple
Siral butterfly valves are not just on/off devices—they offer equal percentage and linear flow
control, enabling smooth system response and accurate variable flow management, even in
complex HVAC applications.