Category: HVAC Controls

How To Choose the Right Control Valves for an HVAC System

HVAC (Heating, Ventilation, and Air Conditioning) systems are not only systems needed in buildings and establishments, but also famous household essentials. They are responsible for the regulation of heat, air flow, ventilation, and air conditioning of your home.

HVAC systems control the overall climate of your home. They make proper adjustments especially when there are changes in outdoor temperature. During the winter season, HVAC systems work in keeping indoor temperature at your most comfortable preference. And during the hot season, HVAC systems work in regulating air temperature by providing necessary cooling.

These powerful systems not only control the temperature inside your home, they also improve the quality of air inside. HVAC systems nowadays are made automatic, meaning you don’t have to manually adjust the time and temperature settings.

Choosing the Right Control Valves for an HVAC System

A control valve is the single most important element in a fluid-handling system. With the development of new control valves in a globally competitive market, choosing the right valve is will have great effect in a system’s efficiency. There are different valves available on the market, and you have to first know the requirements needed for its usage, then pick the valve that meets those requirements.

  • What are the maximum and minimum temperature and pressure requirements?

Always be knowledgeable on your house size as this will determine the kind of HVAC system that you will be needing.

  • Calculate the required CV or the flow of water through a valve.
  • Check for proper close-off rating.
  • Make sure the valve is suitable for the system pressure rating.

Choosing the right control valves will be a step in having the right HVAC system suited for your house. It is always best to consult professionals for wider scope of information regarding HVAC systems, but it’s also good when you have basic knowledge on control valves and how HVAC systems work.

The following are the different types of control valves available in the market:

  1. Ball valves – designed to regulate the flow of water and steam in response to the demands of every HVAC system.
  2. Butterfly valves – high integrity components engineered for a wide range of HVAC applications.
  3. Globe valves – controls the flow of hot or chilled water and steam.
  4. Pressure independent control valves – designed to eliminate the need for separate balancing valves.
  5. Zone valves – provides economical and accurate control of hot or chilled water.
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Is An HVAC Temperature Controller The Same As A Thermostat?

It is a common knowledge that every air conditioning system has a thermostat. The main function of this is to set the temperature in one’s space whenever necessary or when it set to do so. The thermostat exerts its control by switching heating or cooling by regulating the flow of a heat transfer fluid as needed in order to maintain the correct temperature. Literally, it does turn on and off the air conditioning once it reaches the certain temperature that had been set up on it. There are even more advance kind of thermostat that can determine how frequent does the air conditioning needs to run in order to maintain the temperature. These over-the-top kinds of thermostats can actually adapt settings at home depending on the lifestyle. This happens for example when a house or one’s space is unoccupied, the control will automatically adjust the settings to save energy and enhance comfort. It also follows routine like sleep time or wake up time.

Now, when it comes to HVAC, there is a chance that the flow on heating and cooling demand may overflow especially if pumping system operates at its full speed. That is why there is what is commonly called as control temperature in HVAC system that has temperature controller that receives sensor signals and control heaters or other devices to maintain the preset temperature. This does not only focus on the degree of thermal condition but as well as on the humidity, pressure and flow rate control.

In HVAC, the temperature controllers have options of control methods. These could be by enumerated as follows:

  1. On/Off Control Action
  2. P Action or Proportional Control Action
  3. I Action or Integral Control Action
  4. D Action or Derivative Control Action
  5. PID Control
  6. Two PID Control

In conclusion, the thermostat and temperature controller has somehow similar function. Both of those are used in ensuring that certain preset temperature will always be achieved.

Ending this article with a note on how exactly the air conditioning and HVAC works. In AC, it is not exactly the unit gives the cooling but rather it suctions the heat of the room and pump it out outside. While on HVAC, through coolant liquid, it reduces the temperature of the air while sending hot air outside and cold air inside. The transit system for hot and cold air throughout the home is called ductwork.

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