A Combination Valve is just what the name implies… a valve that does a combination of things. The problem is people get confused as to what is happening within the valve and what might be going on. With the information below, we hope some of this gets explained.
Many people will call this particular valve a Proportioning Valve. That isn't necessarily 100% incorrect as a portion of the valve does perform that function. The proper and technical name for this valve is a Combination Valve.
To begin, we should discuss why it is called a Combination Valve. As we mentioned earlier, this valve does a combination of things and is made up of several different segments doing many different things. There is the Pressure Differential Switch and Valve, the Metering Valve and the Proportioning Valve. Read below to learn more.