Knowledge Center
Explore our in-depth analyses of technology, industry trends, and best practices.
Understanding Valve Pressure Ratings
When sizing and selecting control valves, it’s important to consider more than just flow capacity(Cv). Valves must also be able to withstand the pressures they will encounter during operation.These requirements are typically divided into two main categories: Body Pressure Rating The Body Pressure Rating (sometimes called the body and stem or shell rating) defines themaximum […]
Understanding Control Signal Types
In building automation and HVAC systems, actuators respond to different types of controlsignals that determine how they move or position a valve or damper.These control types define how an actuator receives, interprets, and reacts to electrical signalsfrom a controller.Below is an overview of the most common control signal types and what each one means. On/Off […]
Control Valves, The Basics
Control valves are essential components of modern HVAC systems. They regulate fluid flow tomatch real-time heating or cooling demand, ensuring consistent comfort and energy efficiencyacross buildings. By modulating how much fluid passes through coils and circuits, these valvesmaintain stable temperatures while minimizing wasted energy. Manufacturers like Belimo and Siral have advanced control valve technology, integratingsensors, […]
Understanding Butterfly Valves
What Are Butterfly Valves? In HVAC and plumbing systems, butterfly valves are common flow control devices that use arotating disc to regulate or stop fluid flow. They are compact, lightweight, and capable ofhandling large volumes efficiently. The disc inside the valve rotates 90 degrees to move fromfully open to fully closed, giving the valve its […]
Mastering Airflow: Why Dampers and Actuators Matter in HVAC
Dampers are the final control devices for nearly all airflow in HVAC systems, while actuatorsserve as the interface between the control system and the mechanical system. Together, they arecritical for accurate and reliable airflow control. The Importance of Accurate Actuation In modern HVAC systems, over 80% of DDC outputs are sent to actuators. If […]
Understanding and calculating Cv.
Valve Flow Coefficient (Cv) is the flow capability of a control valve at fully open conditions relative to thepressure drop across the valve. It is defined as the volume of water (GPM in the US) at 60°F that will flowthrough a fully open valve with a pressure differential of 1 psi across the valve. It […]