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Falk Plumbing Supply. There should always be at least 10 diameters of straight pipe upstream of the inlet to any circulator. Figure 2 shows a properly positioned secondary circulator. The installer has also located a ball valve between the two tees connecting the secondary circuit to the primary loop. Their reasoning is that temporarily closing the ball valve with force purging flow through the secondary circuit when the system is being filled.

The solution is to install a standard purging valve near the return end of the secondary circuit as shown in Figure 2. This allows the tees to be located as close together as possible, minimizing any pressure drop between them. The purging valve also serves as an isolation valve for the secondary circuit if ever needed.

All secondary circuits also need a means of prevent heat migration into the circuit when it is not operating. A spring loaded check valve, either inside the secondary circulator or downstream of it, is a good check.

An older-style flow-check valve is another possibility. The configuration shown in Figure 2 does. Closing either of the circulator isolation flanges isolates the supply side of the secondary circuit.

Closing the inline ball within the purging valve isolates the return side. This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies.