mastering pressure: the essential guide to pressure reducing valves


A Pressure Reducing Valve (PRV) is a type of valve used to reduce the pressure of a fluid, typically water or steam, in its downstream line. This valve is crucial for protecting plumbing systems from damage caused by high pressure, ensuring system efficiency, and saving on maintenance costs. In this article, we will explore the design, function, and uses of PRVs, shedding light on their importance in various settings.

components of a pressure reducing valve

A PRV typically consists of an inlet port, an outlet port, a spring that controls the diaphragm, and a diaphragm that adjusts to maintain the set downstream pressure. This assembly is crucial for the valve’s ability to regulate pressure.

how it works: the mechanics explained

The PRV operates by balancing the force between a spring and the downstream pressure. The spring’s tension can be adjusted to set the desired pressure level. As the downstream pressure exceeds the set point, the diaphragm compresses the spring, reducing the valve opening and thus the pressure.


domestic use in water systems

In homes, PRVs are installed to control the pressure of the water coming from municipal lines, protecting household appliances and reducing the risk of leaks.

industrial applications in steam systems

In industries, PRVs are essential for controlling steam pressure, which is critical for the safety and efficiency of boilers and other steam-powered equipment.

commercial use in HVAC systems

In commercial buildings, PRVs help maintain appropriate water pressure across heating and cooling systems, ensuring optimal performance and energy efficiency.


preventing water waste

By regulating pressure, PRVs help prevent leaks and bursts in pipes, significantly reducing water wastage.

enhancing safety in piping systems

Properly adjusted PRVs prevent the risk of damage due to high pressure, thereby enhancing the safety of plumbing systems.

reducing maintenance costs

Lower pressure results in less strain on pipes and fixtures, leading to lower maintenance costs and extended system lifespan.

pressure reducing valves vs. pressure relief valves

While both serve essential safety functions, pressure reducing valves (PRVs) are designed to regulate and maintain downstream pressure within a system, ensuring operational stability and protecting against the risks of high pressure. In contrast, pressure relief valves are safety devices that prevent system overpressure by venting excess pressure when it exceeds a predetermined level, thereby safeguarding the system from potential damage or failure.

pressure relief valve
pressure reducing valve

environmental impact consideration

Advancements in pressure reducing valve (PRV) technology increasingly focus on environmental sustainability by optimizing energy use and minimizing system leaks. Modern PRVs enhance system efficiency, reducing the energy required for operations and decreasing carbon emissions. Additionally, improved materials and design reduce leak risks, conserving resources and preventing environmental contamination. 

why choose the Apollo pressure reducing valve

lead-free material

Many Apollo valves, like those in the 36 Series, are made from lead-free materials, ensuring compliance with health and safety standards such as the United States Safe Drinking Water Act. This makes them suitable for potable water applications where lead contamination must be avoided.

dezincification-resistant bronze:

Apollo uses dezincification-resistant bronze in their valve constructions, such as in the 36ELF Series. This material choice provides superior durability and corrosion resistance, which is crucial for maintaining long-term performance and integrity of the valve in various water qualities.

direct-acting design:

The Apollo 36H Series features a direct-acting design. This type of design typically offers reliable performance under varying flow rates and pressures, which is essential for applications requiring precise pressure control.

wide pressure range handling:

Apollo valves are designed to handle a wide range of pressures, making them versatile for different applications. For example, the 36ELF Series can adjust pressures from 15 to 75 psi, accommodating both low and high-pressure applications.

temperature flexibility

These valves are also capable of operating within a broad temperature range, typically from 33°F to 180°F. This temperature flexibility ensures that Apollo valves can be used in a variety of environmental conditions and applications.

easy in-line maintenance:

Apollo valves are engineered for easy maintenance, featuring designs that allow for quick and easy in-line service. This includes simple cartridge removal and replacement, which minimizes system downtime and maintenance costs.

high capacity options

For environments requiring high capacity flow control, Apollo offers valves like those in the 36H and 36HLF Series, which are capable of managing larger volumes and higher flow rates, thus meeting the needs of industrial and commercial applications.

Apollo 36 series
Apollo 36C series
Apollo 36E series
Apollo 36H series


Pressure Reducing Valves are vital components in many plumbing systems, offering benefits of safety, efficiency, and cost savings. As technology advances, the capabilities of PRVs will continue to expand, making them even more integral to modern plumbing systems.

frequently asked questions

1. how to adjust a pressure reducing valve?

To adjust a pressure reducing valve, first locate the adjustment screw on the top of the valve. Use a wrench or screwdriver, depending on the model, to turn the screw clockwise to increase the pressure or counterclockwise to decrease it. Always check the system pressure after making adjustments to ensure it’s within safe operating limits.

2. how to install a pressure reducing valve?

Installing a pressure reducing valve typically involves shutting off the main water supply and draining the existing pipes. Position the valve in the line with the flow direction arrow pointing towards your fixtures. Secure the valve using union fittings or the appropriate connections as specified by the manufacturer. Once installed, slowly turn the water back on and check for leaks.

3. how to replace a water pressure reducing valve?

To replace a water pressure reducing valve, start by turning off the main water supply and draining the system to reduce pressure. Remove the old valve by unscrewing the union nuts or other connections. Install the new valve in the same orientation as the old one, ensuring all connections are tight. Gradually turn on the water and check for leaks.

4. where is the water pressure reducing valve located?

A water pressure reducing valve is typically located where the main water line enters the home or building. It’s often found near the water meter in a basement, utility closet, or garage. The valve will have an adjustment screw on top for setting the pressure and may be connected directly to the meter.

5. can you reduce water pressure by closing a valve?

Reducing water pressure by partially closing a valve is not recommended as it can cause damage to the valve and the plumbing system. Instead, adjusting the water pressure should be done using a pressure reducing valve, which is specifically designed to manage the pressure safely and efficiently.

share this post

more news

send by email


new website feature available now: submittal package builder

streamline your projects effortlessly with our new submittal package builder! Compile, customize, and download our comprehensive product data sheets.


Aalberts integrated piping systems Americas, Inc., a North Carolina corporation with offices located at 10715 Sikes Place, Suite 200, Charlotte, North Carolina (the “Company“), desires to use and publicize the name, likeness, and other personal characteristics and private information of the individual named below with a residence at the address set out below (“I” or “me“) for advertising, promotion, and other commercial and business purposes. In exchange for the intangible value I will gain by participating in Company’s publicity programs/a one-time payment in the amount of $0 and other good and valuable consideration, the receipt and sufficiency of which I hereby acknowledge, I give Company my permission for such use and publicity for such purposes, according to the terms and conditions set forth in this Publicity Waiver and Release (“Agreement“).

 I hereby irrevocably permit, authorize, grant, and license Company and its affiliates, successors, and assigns, [and their respective licensees, advertising agencies, promotion agencies, and fulfillment agencies,] and the employees, officers, directors, and agents of each and all of them (“Authorized Persons“), the rights to display, publicly perform, exhibit, transmit, broadcast, reproduce, record, photograph, digitize, modify, alter, edit, adapt, create derivative works, exploit, sell, rent, license, otherwise use, and permit others to use my name, image, likeness, and appearance, voice, professional and personal biographical information, signature and other personal characteristics and private information, and all materials created by or on behalf of Company that incorporate any of the foregoing (“Materials“) in perpetuity throughout the universe in any medium or format whatsoever now existing or hereafter created, including but not limited to, in and on magazines, brochures and other print publications, electronic, magnetic, and optical media, motion pictures, television broadcast, cablecast, and satellite, home video and video on demand, radio broadcasts, display, point-of-sale, and other advertising and promotional materials, press releases, the internet and other digital transmission or delivery methods, mobile applications, on any platform and for any purpose, including but not limited to advertising, public relations, publicity, packaging, and promotion of Company and its affiliates and their businesses, products, and services, without further consent from or royalty, payment, or other compensation to me.

Company shall be the exclusive owner of all rights, including copyright, in the Materials. I hereby irrevocably transfer, assign, and otherwise convey to Company my entire right, title, and interest, if any, in and to the Materials and all copyrights and other intellectual property rights in the Materials arising in any jurisdiction throughout the universe in perpetuity, including all registration, renewal, and reversion rights, and the right to sue to enforce such copyrights against infringers. I acknowledge and agree that I have no right to review or approve Materials before they are used by Company, and that Company has no liability to me for any editing or alteration of the Materials or for any distortion or other effects resulting from Company’s editing, alteration, or use of the Materials, or Company’s presentation of me. Any credit or other acknowledgment of me, if any, shall be determined by Company in Company’s sole discretion. Company has no obligation to create or use the Materials or to exercise any rights given by this Agreement.

To the fullest extent permitted by applicable law, I hereby irrevocably waive all legal and equitable rights relating to all liabilities, claims, demands, actions, suits, damages, and expenses, including but not limited to claims for copyright or trademark infringement, infringement of moral rights, libel, defamation, invasion of any rights of privacy (including intrusion, false light, public disclosure of private facts, and misappropriation of name or likeness), violation of rights of publicity, physical or emotional injury or distress, or any similar claim or cause of action in tort, contract, or any other legal theory, now known or hereafter known in any jurisdiction throughout the world (collectively, “Claims“), arising directly or indirectly from the Authorized Persons’ exercise of their rights under this Agreement or the production, exhibition, exploitation, advertising, promotion, or other use of the Materials, and whether resulting in whole or in part from the negligence of Company or any other person, and I hereby covenant not to make or bring any such Claim against any Authorized Persons and forever release and discharge the Authorized Persons from liability under such Claims. I understand that Company is relying on this Agreement and will incur significant expense in reliance on this Agreement, and I agree that this Agreement cannot be terminated, rescinded, or modified, in whole or in part.

I represent and warrant to Company that I am at least 18 years of age, and I have full right, power, and authority to enter into this Agreement and grant the rights granted hereunder. I further represent and warrant to Company that I will provide only true and correct statements and other information in connection with this Agreement, and the Authorized Persons’ use of the Materials and the rights and license granted hereunder do not, and will not, violate any right (including without limitation copyright, trademark, trade secret, right to privacy, or right of publicity) of, or conflict with or violate any contract with or commitment made to, any person or entity, and that no consent or authorization from, or any payment to, any third party is required in connection herewith.

This Agreement constitutes the sole and entire agreement of the parties with respect to the subject matter contained herein and supersedes all prior and contemporaneous understandings, agreements, representations, and warranties, both written and oral, with respect to such subject matter. I have not relied on any statement, representation, warranty, or agreement of Company or of any other person on Company’s behalf, including any representations, warranties, or agreements arising from statute or otherwise in law, except for the representations, warranties, or agreements expressly contained in this Agreement. If any term or provision of this Agreement is invalid, illegal, or unenforceable in any jurisdiction, such invalidity, illegality, or unenforceability will not affect any other term or provision of this Agreement or invalidate or render unenforceable such term or provision in any other jurisdiction. Company may assign this Agreement and its rights hereunder, in whole or in part, to any party. This Agreement is binding on and inures to my benefit and the benefit of Company and our respective heirs, executors, administrators, legal representatives, successors, and permitted assigns. All matters arising out of or relating to this Agreement shall be governed by and construed in accordance with the internal laws of the State of North Carolina without giving effect to any choice or conflict of law provision or rule (whether of the State of North Carolina or any other jurisdiction). Any claim or cause of action arising under this Agreement may be brought only in the federal and state courts located in North Carolina, and I hereby irrevocably consent to the exclusive jurisdiction of such courts.


by signing below I acknowledge that I have read and accept all terms and conditions in the Publicity Waiver and Release form and are authorizing an electronic signature as opposed to a written signature