What is the Brass Pressure Reducing Valve?

In this blog post, you’ll read:A brass pressure-reducing valve is a valve that reduces the external high pressure of water into lower. They fix the primary water line next to the shut-off valve. The water moves via the valve; it passes via the diaphragm linked to the spring
Table of Contents

A brass pressure-reducing valve is a valve that reduces the external high pressure of water into lower. They fix the primary water line next to the shut-off valve. The water moves via the valve; it passes via the diaphragm linked to the spring. Yet, it lowers the pressure of water up to the desired limit. Although, the water moves from this valve via the other end.

Once the PRV is set, the pressure maintains despite the changes in the supply pressure and system load variations. A brass pressure-reducing valve holds the pressure in the home. Yet, it keeps it at a suitable steady level.

Why is Brass Pressure Reducing Valve So Important? Why do we need it?  

ironing solenoid valve
Pressure reducing valve

This valve keeps your pipe. It also holds your plumbing fitting from bursting due to the high pressure of water. The pressure of water can put stress on your lines. Yet, this high-pressure causes damage or break the plumbing fit leading to seepages. This pressure-reducing valve saves water. Yet, the less pressure it provides, the lowers the water flow load and the safe the environment.

It also aids in keeping the energy which consumes by high-pressure water flow. The water flow with low pressure requires low power for the load. Ultimately, it helps increase pressure safety on plumbing maintenance. Yet, it lowers the problems with your plumbing system due to the water’s high pressure.

Extends the Lifespan of your appliances and fixtures: All plumbing related to devices and fixture building handles water pressure between 50-80 psi. Yet, your main water line pumps water to your home at 150 psi.

This diversity means a high tension level is set on your plumbing framework. Ultimately, it leads to frequent repair and costly changing of some parts. Yet, your appliances and fixture have a more lifespan if you maintain proper water pressure.

boiler solenoid valve
Pressure safety valve

What are the types of Brass Pressure Reducing Valves?

Here are the main types of this valve;

· Direct acting PRV

· Internally piloted piston operated

· Externally Piloted piston operated

1) Direct Acting

The most common type of pressure-reducing valve is direct acting. It works with either convoluted bellows or a flat diaphragm. Yet, it is self-maintained. It does not require any outer detecting lines downstream to work.

Yet, this kind of PRV is the most economical of the three valve types. It designs for low to moderate streams.

direct acting
direct acting

2) Internally Piloted Piston Operated

This kind of pressure-reducing valve has two valves. One is a pilot, and the other is a primary valve in one unit. The pilot valve has been built similarly to that direct-acting valve. The release from the pilot valve acts on the top of the piston. This piston opens the primary valve. This build uses inner pressure to open a sizeable primary valve that could otherwise open directly.

Finally, there is a large capacity per line size. Yet, this kind of PRV has greater accuracy than direct acting. In direct-acting valves, the pressure detects internally. Yet, it removes the need for outer detecting lines.

pressure reducing valve
Piston pressure-reducing valve

3) Externally Piloted Piston Operated

Externally directed. In this kind, a twofold diaphragm supplants the piston operated by the internally piloted plan. This extended diaphragm area can open a tremendous primary valve. It permits a more central limit for each line size than the inside piloted valve. Yet, the diaphragm is more tender to pressure changes.

However, that implies an accuracy of +/ – 1%. This more excellent accuracy is because of the area, outer to the valve, of the detecting line, where there is less turbulence. This valve also offers the adaptability to operate various kinds of pilot valves.

How do Brass Pressure Reducing Valves Work?

A PRV is a valve that takes a high inner pressure. Yet, it decreases it to lower external pressure. It ensures this below both non-flow and flow conditions. This kind of control is called drop tight. It applies the balance diaphragm and spring to keep the downstream pressure. This tight drop feature is one of the essential standards for any PRV. Yet, it stops the pressure from creeping.

Creeping means when the increase in downstream occurs below no stream conditions. A valve that permits this creep cannot be called the drop tight or true PRV. It will eventually enable the pressure to creep up to equal the upstream pressure. Yet, this will cause the main issues and necessarily denies the point of applying the PRV in the first place.  

The diaphragm separates entire of the water links elements. It also separates the pressure from the main water supply from the control spring and other links mechanism. The body protects from waste materials by the application of a filter. In case of no flow conditions, the downstream pressure puts back pressure. This pressure puts on the diaphragm and seats of the valve. It will in rotates and overcomes the spring pressure.

The seat will move up, forcing it to lock against the diaphragm. Yet, therefore, it will not permit the downstream pressure to be higher. In case of underflow condition, the back pressure against the seat decrease. Yet, consequently, it helps the seat to open. The water will flow by this valve.

from Fabio Malgorani

How to Size a Pressure-Reducing Valve?

The size of pressure reducing valve depends on two things. The first is flow rates, and the other is application. The applications state the kind of valve that is used. Yet, whether it is domestic, industrial, or commercial installation. Flow rate is an essential aspect for measuring the size of pressure reducing valve. Incorrect measuring of the size of the valve creates various issues.

Yet, if you will over-size the valve seat, it may open for a lower flow rate. Although it is suitable over time, it results in wire drawing through the valve seat. A wire drawing occurs when the seat position and valve seat work close to shut off the valve. This means the water flow rates away in the seat material, which remains.

 It is done when the valve is close tight to the shut-off position. It permits a small stream and pressure to creep via the valve. To measure the size of the flow rate, you need to work out how many outlets are required. Also, what the total maximum flow rate for these will be? Here is the table to ascertain which size valve needs.

Size Guide for Pressure Reducing Valve

 Commercial buildingResidential building
Size DNMax flow rateMax flow rate

 For prominent commercial uses, various size key applies. For instance, the flow rate is low at sometimes than at others. Applying the different smaller size PRVS in parallel is more beneficial. Yet, you can also use one smaller valve as a bypass. Thus, the flow rate is less than regular permits water to move by the valve. It will not affect either wire drawing or making sound through the valve.  

Main Components of a Pressure-Reducing Valve

pressure reducing valve
pressure reducing valve

The pressure-reducing valve involves various parts that help with proper function. Here are the main parts

  • Valve body
  • Pilot regulator
  • Large control filter

1) Valve body

It has the inner V port throttling plug. This plug offers a stable and accurate response. This response to pressure and flow regulation lowers the vibration and sound. The  V port throttling plug also enables the valve to work near zero without hunting.

2) Pilot Regulator

It handles the stream of water in the control chamber. It’s called the brain of the valve. The needle with this regulator assists in keeping the constant pressure.   

3) Large Control Filter

The third part of PRV is a significant control filter. The valve operates with the error-free operation and minor maintenance. Yet it is essential to filter the water by moving the pilot regulator. The filter induces the reliability of the control valve system and times the upkeep. Yet the reduce the faulty work and maintenance upkeep.

pressure reducing valve
pressure reducing valve

How High Water Pressure Can Affect Your Plumbing

Pipe leaks

 Uniform high water pressure breaks down pipe joints after some time. Yet, you could end up with minor hole releases that slip through the cracks.

The high pressure causes a water hammer. It happens when quick water stops by something like a spigot switching off. When pressure is higher, the water hammer impact is boosted. With a PRV, the water hammer can be better controlled.

Water heaters

Water heater breaks and blasts are normal circumstances. This is carried about by higher-than-needed water pressure. Water extends as it warms up. Most water radiators have what is called an “extension tank” that is intended to offload this expansion of water.

In homes with high pressure, your heated water tank might have a lot of water because the tension composes more water than needed. When the water rises from getting hot, it has no place to flow. It brings about breaks, and the tank explodes.

pressure reducing valve
pressure reducing valve

Washing machines, dishwashers, and other water-utilizing machines

Assume your search in the consumer manuals of most water-utilizing machines. In that case, they are worked to take water pressure no higher than 80 psi. Higher pressure will put devices under consistent pressure and break them down more quickly. The worst situation is that the water strain can break the hose of an appliance. Yet, it becomes isolated, which will cause holes and overflows – destroying your floors.


Lavatories and other pipes installations are planned to deal with a strain of around 80 psi. High water pressure can break down the flushing tool of the latrine tank. Yet, it can move a concise latrine flapper spill into an excessive water waster. Yet, as more water rushes into the tank faster, it loads and tops off.

pressure reducing valve
pressure reducing valve

Some Applications of a pressure-reducing valve

Steam Services

The most pressure-reducing valves apply in steam application. It includes the turbines, steam engines, and steam supply.

Water Services:

Brass PRV applies in various applications in industrial and domestic water supply services. It is also used in fire protection frameworks. In standard, the direct-acting PRV suggests these services. Yet, in a high-pressure demand situation, keeping system pressure becomes very difficult. It applies to those pipelines which efficiently maintain the pressure downstream to a suitable level.

Air or gas services:

Both pilot operated and direct-acting applies for gas and air services. It applies in

  • power tools
  • air system
  • pneumatic control system.
  • And the control valve for the industrial distribution and storage systems.  

The choice of the kind of PRV for these amenities depends on the correctness of control needs.

Significant advantages of pressure-reducing valves

Here are the critical benefits of a pressure-reducing valve.

  • Low cost with easy to design
  • No outer energy source
  • Easy to maintain and high reliability
  • Separate the measuring parts or feedback controller are not needed.
pressure reducing valve
pressure reducing valve

FAQs about pressure-reducing valve

How Do I know if U have a PRV?

If you understand where your water shut-off valve is situated, you can look for PRV. It usually is within a few feet of the shut-off valve. It has a bell-like shape.

Is pressure the reducing valve and pressure relief valve are same?

No, both are not the same and do not apply for the same purpose. The PRV must use to maintain or reduce the pressure on the system. It decreases the pressure of the system more than its maximum pressure. The pressure relief valve applies to restrain the maximum pressure in a hydraulic.

Final Words:

Standard water pressure is the code to keep fit plumbing in your home. If you leave it unchecked, the high-pressure water will affect everything in contact with your plumbing system. So, it is vital to install a pressure-reducing valve in your home. Maintaining your home water pressure with the help of PVR helps. Your one-time buying of the valve can save a lot of energy you will spend repairing the device that comes in contact.

Solutions For Waterworks Plumbing

Get quote Now

Free Sample with OEM

× How can I help you?