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In the last R. L. Deppmann Monday Morning Minute we covered some thoughts on the use of code vs. non-code hot water expansion tanks. Why does the system need a thermal expansion tank? How do you size a domestic hot water thermal expansion tank? Bell & Gossett has an online selection program called ESP-Systemwize that will make the selection very easy.

Pressure gauges with brass connection are equipped with a high-quality plastic housing. Pressure gauges with stainless steel connection also have a stainless steel housing. Can also be used with aggressive media and in aggressive environments.

Why do systems require a tank today? Years ago, plumbing systems did not have a tank. In fact, the term “thermal expansion tank” did not even exist. When a domestic hot water system is heated from a cold start it is completely filled with water. If there is no water being used when it is heated, the pressure will start to increase. Decades ago this was not a problem since the pressure would dissipate into the cold city water supply lines. Today we often use reduced pressure zone type backflow preventers on the cold water supply. These act as check valves. The net result, when there is no demand, is that the system acts like a closed hydronic system which needs an expansion tank. If there is no tank, the relief valve might open due to over-pressurization.

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If a draw-off point on the outlet side is opened medium flows through the valve and the outlet pressure falls below the set pressure. Once the draw-off point is re-closed the outlet pressure rises again to the set pressure.

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Tanks are often selected using software programs such as the Bell and Gossett ESP-Systemwize selection program. Let’s look at the program.

A pressure reducing valve (PRV) is a type of valve that reduces a higher upstream pressure to a stable lower downstream pressure.

In the case of a pressure reducing valve, the outlet pressure (pressure prevailing on the outlet side) is set. The set pressure of a pressure reducing valve always refers to the outlet pressure at zero usage. i.e. no medium is flowing through the valve and all draw-off points are closed.

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No, the pressure reducing valves are described as "fully balanced", this means that varying inlet pressures are compensated by means of the geometry of the valve and thus have no influence on the outlet pressure.

In the next R. L. Deppmann Monday Morning Minute we will look at applying safety factors in thermal expansion tank sizing as well as troubleshooting issues.

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Water Regulation Compliant pressure reducing valves (PRV) for pressure relief and management. Valves available with gauges for accurate adjustments.

The pressure reducing valve controls the outlet pressure – the inlet pressure has no influence on the control of the pressure.

It is always valuable to understand what is going on behind the program, so let’s start with the formula used for pre-charged tanks and some basic terms.

For most pressure reducing valve series valve inserts or repair kits are available. Further information including part numbers are to be found in the technical datasheets.

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