Switching Over to New HVAC Technology Is Scary but Worth It in the End | 2018-11-12 | Pressure Reduction Valve

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Another type of direct-acting relief valve has a guided piston. In this valve, a sliding piston — instead of a poppet — connects the pressure and reservoir ports. System pressure acts on the piston and moves it against a spring force. As the piston moves, it uncovers a reservoir port in the valve body.

The other common devices to reduce pressure are PRVs These valves maintain a constant flow pressure and gpm despite the system pressure. These valves can be either factory-adjusted (preset) or field-adjustable*. The units that are factory adjusted are specific for each floor and great care must be taken during installation to ensure that they are on the proper floor. The field-adjustable units are field calibrated once they are installed on the floor by a technician. Another small subset of field-adjustable are what some people refer to as fireground adjustable. These can be adjusted by fire department personnel with the right know-how, and they require specific rods to manipulate. PRVs are usually distinguishable by a large rim on the top or bonnet of the valve (photos 6-8), but this is not always the case (see Zurn/Wilkins and Croker systems). Also, once the end cap has been removed, the presence of a smooth stem is a direct sign of a PRV (photo 9). A non-PRV would have a threaded stem (photo 10.). PRVs can also be installed at ceiling level, reducing pressure before water flows to the hose outlet or sprinkler system. This is common in combination systems where the sprinkler system and standpipe system share a common riser. Sprinklers require higher pressures than standpipes due to friction loss in smaller piping and higher operating pressures. In this situation, the system can share one PRV, reducing pressure before separating into the sprinkler piping and standpipe system for the floor. In addition, PRVs are a one-way valve relying on pressure from behind to open the valve. When it comes to pumping buildings there are two main concerns. First is that each valve has required system pressure, which will cause the valve to unseat. If you take over the system, pump the system demand pressure to get the rated outlet pressure for the valve. Second, during FDC emergencies, often the driver’s first thought is to pump into the standpipe itself via the first-floor outlet. The PRV is a one-way valve that is opened by pressure on the back side. You will not be able to pump into a standpipe outlet that has a PRV; it will close the valve shut. We will discuss pumping these systems in further detail later on.

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StormTrap, LLC provides stormwater management solutions to municipal, commercial, industrial and residential markets.

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Butterfly valves recently became available with disks having an inherent equal percentage flow characteristic. This delivers an installed characteristic that results in an installed process gain within the desired 0.5 to 2.0 range over a wider travel. This results in significantly improved throttling control, especially in the lower travel ranges.

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