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        Air Vents:
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        • DISCALAIR® Automatic (up to 4.5 SCFM)
        • HYGROCAL™ Radiator Air Vent
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        • Manual
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        • ROBOCAL™ Automatic (up to 0.8 SCFM)
        • VALCAL™ Automatic (up to 2.5 SCFM)
      • DIRTMAG® Magnetic Dirt Separators
        DIRTMAG® Magnetic Dirt Separators:
        • Accessories
        • DIRTMAG® (ANSI Flange)
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        • DIRTMAG® Pro (Brass)
      • DISCALDIRTMAG® Air and Magnetic Dirt Separators
        DISCALDIRTMAG® Air and Magnetic Dirt Separators:
        • Accessories
        • DISCALDIRTMAG® (ANSI Flange)
        • DISCALDIRTMAG® (Brass)
      • DISCALDIRT® Air and Dirt Separators
        DISCALDIRT® Air and Dirt Separators:
        • Accessories
        • DISCALDIRT® (ANSI Flange)
        • DISCALDIRT® (Brass)
      • DISCAL® Air Separators
        DISCAL® Air Separators:
        • Accessories
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        • DISCAL® (Brass)
      • Gold Standard Kit
        Gold Standard Kit:
        • Accessories
        • Gold Standard Kit™
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      Backflow Prevention and Safety Devices:
      • Backflow Preventers
        Backflow Preventers:
        • Dual Check with atmospheric vent (DuC-AV)
        • Reduced Pressure Principle (RP)
      • Safety Devices
        Safety Devices:
        • Vacuum Relief Valves (VRV)
    • Balancing Valves
      Balancing Valves:
      • Dynamic
        Dynamic:
        • Accessories
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        Static (manual):
        • Accessories
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      • Thermal
        Thermal:
        • Accessories
        • ThermoSetter™
    • Distribution Manifolds and Mixing Stations
      Distribution Manifolds and Mixing Stations:
      • Assemblies
        Assemblies:
        • Accessories
        • TwistFlow™
      • Temperature Mixing Units
        Temperature Mixing Units:
        • Accessories
        • HydroMixer™
      • Thermostatic Manifold Mixing Stations
        Thermostatic Manifold Mixing Stations:
        • Accessories
        • Low Temperature
    • Filling Units and Boiler Trim Kits
      Filling Units and Boiler Trim Kits:
      • Automatic Filling Units
        Automatic Filling Units:
        • Accessories
        • AutoFill™ Combo
        • AutoFill™
        • Boiler Trim Kits
      • Water Treatment
        Water Treatment:
        • Accessories
        • Filling Units
        • HYDROFLUSH™ (fill and flush cart)
    • Fittings
      Fittings:
      • AutoFill™
        AutoFill™:
        • Tail pieces, union nuts, washers
      • Backflow Preventers
        Backflow Preventers:
        • Tail pieces, union nuts, washers
      • PresCal™
        PresCal™:
        • Tail pieces, union nuts, washers
      • Separators
        Separators:
        • Tail pieces, union nuts, washers
      • Small Valves
        Small Valves:
        • 1" union Fittings
        • Tail pieces, union nuts, washers
      • Threaded
        Threaded:
        • Union nuts, nipples adapters, bushings
    • Hydraulic Separators
      Hydraulic Separators:
      • 4-in-1 SEP4™
        4-in-1 SEP4™:
        • Accessories
        • SEP4™ (ANSI Flange)
        • SEP4™ (Union)
      • Combined Hydraulic Separator and Manifold
        Combined Hydraulic Separator and Manifold:
        • Accessories
        • HydroLink™
      • Hydro Separators
        Hydro Separators:
        • Accessories
        • Hydro Separator (ANSI Flange)
        • Hydro Separators (Union)
        • HydroCal™ (ANSI Flange)
    • Mixing Valves
      Mixing Valves:
      • Electronic
        Electronic:
        • Accessories
        • LEGIOMIX®
      • Thermostatic (point of distribution)
        Thermostatic (point of distribution):
        • Accessories
        • AngleMix™
        • MixCal+™ (high flow)
        • MixCal™
        • TankMixer™ (DHW kit)
      • Thermostatic (point of use)
        Thermostatic (point of use):
        • Accessories
        • SinkMixer™ (4-way)
        • TubMixer™ (high flow)
    • Pressure Reducing Valves
      Pressure Reducing Valves:
      • Diaphragm Type
        Diaphragm Type:
        • Accessories
        • PresCal™
        • Prescal™ Compact
      • Piston Type
        Piston Type:
        • PresCal™ HP
    • Renewable Components and Energy Meters
      Renewable Components and Energy Meters:
      • Biomass
        Biomass:
        • Accessories
        • ThermoBloc™ (recirc and distribution units)
        • ThermoProtec™ (mixing valves)
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        Energy Meters:
        • Accessories
        • CONTECA™
      • Solar
        Solar:
        • Accessories
        • Air Vents
        • DISCAL® (air separators)
        • Mixing Valves
        • Pump Stations
        • Safety Relief Valves
    • Specialty Components and Kits
      Specialty Components and Kits:
      • Air Vents (plumbing)
        Air Vents (plumbing):
        • PLUMBVENT™
      • Check Valves
        Check Valves:
        • Accessories
        • Check Valves (serviceable)
      • Differential Pressure Bypass
        Differential Pressure Bypass:
        • Differential Pressure Bypass Valves
      • Isolation Ball Valves
        Isolation Ball Valves:
        • Accessories
        • Isolation Valves
      • Kits
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        • Boiler Trim Kits
        • Gold Standard Kits
        • Tankless Water Heater Kits
      • Universal Flow Switch
        Universal Flow Switch:
        • Uni-Switch™
      • Y-strainers
        Y-strainers:
        • Accessories
        • Y-strainers (hydronics)
    • Thermostatic Radiator Valves
      Thermostatic Radiator Valves:
      • Connection Valves
        Connection Valves:
        • Accessories
        • Angled Version
        • Straight Version
      • Control Heads
        Control Heads:
        • Accessories
        • Control Heads (Built-in Sensor)
        • Control Heads (Remote Sensor)
      • Radiator Valve Bodies
        Radiator Valve Bodies:
        • Accessories
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        • Valve Bodies (straight)
    • Zone Valves, Controls and Coil Kits
      Zone Valves, Controls and Coil Kits:
      • Motorized Ball Zone Valves
        Motorized Ball Zone Valves:
        • 2-way (straight)
        • 3-way (by-pass)
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      • Motorized Zone Valves
        Motorized Zone Valves:
        • 2-way Bodies (straight flow)
        • 3-way Bodies (diverting flow)
        • Accessories
        • Actuators (normally closed)
        • Actuators (normally opened)
        • Z-one™ 2-way
      • Pressure Independent Control Valves (PICV)
        Pressure Independent Control Valves (PICV):
        • Accessories
        • FLOWMATIC®
      • Thermo-electric Zone Valves
        Thermo-electric Zone Valves:
        • Accessories
        • TwisTop™
      • Z-one™ Zone Controls
        Z-one™ Zone Controls:
        • Pump Zone Controls
        • Valve Zone Controls
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Pressure Reducing Valves
Blog

Pressure Reducing Valves

Blog post categories list
Blog post categories list
Hydronic Principles Ask Caleffi Podcast Mixing Valves, Thermostatic Air and Dirt Separation Domestic Hot Water Systems Zone Valves and Radiator Valves Air Vents Water Quality Balancing Valves Mixing Valves, Electronic Zone Relay Controls Coffee with Caleffi Q&A Solar Components Hydraulic Separation Manifolds and Mixing Stations Pressure Reducing Valves Articles Filling and Backflow Prevention Magnetic Separation 5 Things You Need To Know Geothermal and Biomass Certifications Engineering Tools and Documentation Heat Meters
The Ask Caleffi team welcomes a new member (with Matt DeLuca)
August 15, 2022

The Ask Caleffi team welcomes a new member (with Matt DeLuca)

How does Caleffi support a rapidly growing plumbing product offering?  What makes a great troub...
Read more
Why is the plumbing pressure too high? (with Cody Mack)
July 29, 2022

Why is the plumbing pressure too high? (with Cody Mack)

Where does the water come from?  How do you know what pressure you need in a building? Are you ...
Read more
5 Things You Need to Know About Why Your PRV Screams (with Cody Mack)
July 05, 2022

5 Things You Need to Know About Why Your PRV Screams (with Cody Mack)

A return guest joins Greg and Dan during this Episode:  Cody Mack, Caleffi training and educati...
Read more
Plumbing Session! What Are The Most Common Questions?
June 23, 2022

Plumbing Session! What Are The Most Common Questions?

What tech support questions does Caleffi get over and over again? You might be surprised! What to do...
Read more
No pressure... but what's THAT noise?
August 26, 2021

No pressure... but what's THAT noise?

Ask Caleffi Podcast (Episode 8)
Read more
How do I make sure my pressure reducing valve is working properly?
April 15, 2020

How do I make sure my pressure reducing valve is working properly?

Pressure reducing valves, like most components in your system, are subject to water quality and repe...
Read more
Can the Caleffi PRV be mounted upside down?
July 26, 2017

Can the Caleffi PRV be mounted upside down?

We advise no; keep the body above the horizon when mounted in a horizontal pipe, or mount it in a ve...
Read more
What is fall-off pressure for a pressure reducing valve?
December 08, 2016

What is fall-off pressure for a pressure reducing valve?

Fall-off pressure is the reduction of pressure at the outlet of a pressure reducing valve (PRV), whe...
Read more
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