What is the difference between on off control and modulating control?
What is a modulating valve?
A modulating control valve is an automated valve that is used to control the amount of flow in a system or process. They go beyond simple shutoff or isolation (on/off) and actually allow precise control of the flow rate.
What is the difference between actuated valve and control valve?
A control valve is just an actuated valve where the actuator is modulated via a signal from a controller. A self operated regulator has a connection to the process and uses a process variable such as pressure, level, or temperature to generate the force that actuates the valve.26 may 2009
What is a Belimo actuator?
Belimo HVAC damper actuators are for use in a wide variety of on/off, modulating or communicating damper and life safety applications. The actuators have a comprehensive torque range and the ability to direct mount on standard damper shafts.
How does an electric control valve work?
The electric actuator generates this torque and transmits it to its output shaft, which is then connected to the valve's stem, or shaft. This, in turn, rotates the valve's ball or disc and opens or closes the orifice to allow flow through or block the flow.
Is an actuator a damper?
Dampers are the final control devices for almost all airflow in HVAC systems. Actuators are the interface between the control system and the mechanical system and are critical to accurate control. ... A controller cannot compensate for incorrect damper or actuator sizing.24 jun 2013
How does a damper actuator work?
Only by using an actuator-controlled automatic zone damper can the system regulate the amount of air the HVAC system produces. Actuators in HVAC systems control the dampers. By utilizing a low voltage signal, the actuator places the damper at any point between fully open and fully closed.9 ene 2019
What is a fire damper actuator?
Belimo safety actuators for fire dampers automatically move to their safety position in case of fire and keep dampers closed during the fire. They offer the best protection against the spread of fire and smoke through ducts.
How does a damper end switch work?
End switches are typically wired to a fan and/or to a light serving as an open/not open indicator. When the damper is powered open, one of the damper blades makes contact with the spring rod of the end switch which in turn makes a connection allowing power to flow to the fan and/or light.