How does a pressure limiting valve work? A PLV is installed near the main water line, usually at the front of your property. The valve closes when water pressure is too high, and opens when it is low. It regulates the flow of water into your pipes and keeps it at a steady level.. Pressure limiting valves work by restricting the inlet supply line pressure to a predetermined maximum that stops the occurrence of excessive pressure incidents in your home. When water pressure is below the pressure limit, the valve remains open. If the valves pressure exceeds this, the valve shuts and water can no longer flow through it.

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Pressure-limiting valve. Pressure-limiting valves limit the inlet pressure by opening the outlet to the tank via the function element (which is closed at rest) on reaching the set pressure. This action occurs by opening against a closing force, which is normally applied by a spring. Pressure-limiting valves are always in the parallel circuit.. Pressure-control valves are found in virtually every hydraulic system, and they assist in a variety of functions, from keeping system pressures safely below a desired upper limit to maintaining a set pressure in part of a circuit. Types include relief, reducing, sequence, counterbalance, and unloading. All of these are normally closed valves.