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Some rely on a 3-way control loop and others on 2-way. Some are full bore for minimal head loss during insufficient inlet pressure and others are reduced bore for achieving efficient pressure regulation.

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While in Irrigation & Fire Protection, flow is constant and occurs in shifts/pulses, depending on the crops or firefighting emergency events.

When downstream pressure is higher than the required set-point, the pilot allows water to flow from the upstream to the control chamber and the valve tends to close.

Based on this understanding there are many different types of Pressure Reducing Valves and configurations to optimally suit these varying requirements

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Hydraulically operated pressure reducing control valves reduce a higher upstream pressure to a constant lower downstream pressure, regardless of fluctuating demand or varying upstream pressure.

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In Irrigation PRVs are required in water headers in the entry of lower elevation fields, pivot-machines, low pressure systems like dripping pipes and more.

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Founded in 1866, the family-owned company has over 100 locations across the Northeast to support the needs of customers from commercial and residential contractors to industrial and institutional operators of large facilities. F.W. Webb offers an extensive inventory, personalized customer service, and a dedicated fleet of delivery trucks to service our customers' needs.the Northeast, United States. Whether you have a planned project, emergency job, or ongoing maintenance and repairs, you can rely on F.W. Webb for the products and parts you need.

*This example refers to 3-way control method. In Waterworks and Buildings 2-Way is common as well, which has somewhat different principles of operation.

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In high rise buildings, PRVs are located on every floor or every few floors, for protecting the department’s plumbing and low rated fittings & connections from overpressure.

In municipal networks pressure reducing valves (PRV) are required at the inlet of pressure zones or DMAs (District Metering Areas). On the one hand, for protecting the equipment at the downstream and  household plumbing  from overpressure. On the other hand, guaranteeing sufficient & reliable pressure for the consumers.

System pressure can vary due to many different reasons. Pumps starting, changes in topography, pipe characteristics, the resistance of equipment along the system, leaks & water theft and of course the demand flow pattern which has a direct effect on the pressure loss across the pipeline.

With 100+ locations across the Northeast, F.W. Webb Company is the largest industrial equipment supplier with 16 areas of expertise including Plumbing, Heating, HVAC, Refrigeration, PVF, Building Controls, Propane Gas Equipment, Water Systems, High-Purity Process Components, Industrial PVF Specialties, Thermoplastic Piping, Process Controls, Fire Protection & Fabrication, Commercial & Industrial Pumps, Water Works, and Alliance Environmental Group.

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When downstream pressure is lower than the required set-point, the pilot drains water from the control chamber to the atmosphere and the valve opens.

When downstream pressure is equal to the required set-point, the pilot keeps the water in the control chamber and the valve remains in the same position, not opening or closing, and thus retaining the set pressure.

Some have throttling devices to cope with low flows, and others have different mechanisms to eliminate/reduce cavitation.

The hydraulic pressure reducing valves are equipped with a pressure reducing pilot designed to hydraulically sense the downstream pressure.

The pressure reducing pilot commands the valve to throttle/close when the downstream pressure increases ABOVE the pilot pressure set point and to open the valve when the downstream pressure decreases to BELOW the pilot pressure set point.