Types of industrial pressure reducing valves

We offer a wide range of pressure reducing valves for industrial systems

At Valfonta, we offer a wide range of industrial pressure reducing valves, designed to ensure safety, efficiency, and stability in processes where pressure control is a critical factor. If you are looking for an overview, our guide reviews all the classes of industrial valves and their function.

With more than 50 years of experience in design and manufacturing, we have developed models that adapt to the needs of many sectors, from the chemical and pharmaceutical industries to energy, food, and water treatment.

Most of our valves are designed to work with liquids, inert gases, and steam, and they are manufactured in different materials and configurations to meet very diverse flow, pressure, and temperature conditions.

Thanks to this approach, we have solutions that cover a wide spectrum of industrial applications, from compact laboratory installations to complex distribution networks in large plants.

M1 reducing valve

This is a pressure regulating valve self-operated by diaphragm that keeps the downstream pressure stable without auxiliary power. It is designed for steam, compressed air, inert gases, and liquids, with a fast response to changes in demand and proportional closing as P2 increases. 

From DN65 upward, it incorporates a balancing plunger to stabilize the influence of the inlet pressure. The stem is sealed with a double stainless steel bellows (anti-twist system), and the pressure chamber is fitted with reinforced diaphragms, which improves tightness and durability. 

Main technical characteristics

• Available with a regulating range of 0.1–15 barg and a maximum inlet pressure of 40 barg (DN15–50) / 25 barg (DN65–150). 
• Bodies in RG10 bronze, A216 WCB carbon steel, or A351 CF3M stainless steel; EN 1092 PN16–PN40, ANSI 150/300, and BSP/NPT threaded connections; AISI 316L internals. 
• EPDM (-40 to 125 °C) or EPDM+PTFE (up to 250 °C) diaphragms; various plug materials (graphite-filled PTFE, NBR, PEEK, etc.). 
• Optional ATEX compliance (II 2 GD) for zones 1/2 (gas) and 21/22 (dust). Reference Kv by size: 3.5 to 240 m³/h (DN15–DN150).

Typical applications: pressure reduction/stabilization in steam lines (with a water seal pot if >125 °C), compressed air networks, industrial water, and inert gases; ideal as a standalone regulator on process drop lines, heat exchanger feeds, and protection of sensitive equipment where low maintenance and high reliability are required.

M2 reducing valve

The Valfonta M2 pressure reducing valve is a direct-acting model that works without auxiliary power. Regulation is achieved by a control diaphragm that balances the downstream pressure against the force of an adjusting spring, allowing it to keep the outlet pressure stable even when the inlet pressure fluctuates.

This design makes it especially suitable for liquids, inert gases, compressed air, and steam, providing a fast and reliable response in applications that require constant and safe regulation.

Main technical characteristics

• Available sizes: DN15 to DN100, covering a wide range of installations.
• Maximum inlet pressure: up to 40 barg, making it suitable for demanding systems.
• Regulating range: different adjustable ranges depending on the spring installed, allowing it to be precisely matched to each process requirement.
• Rugged construction: body in bronze, carbon steel, or stainless steel, depending on service requirements.
• Reinforced diaphragm: made of EPDM or combined with PTFE for higher temperatures, ensuring strength and a long service life.
• Connections: available with EN1092 (PN16–PN40) or ANSI 150/300 flanges, or BSP/NPT threads, offering integration flexibility.
• Plug and internal components: in AISI 316L stainless steel, ensuring corrosion resistance and compatibility with a wide range of fluids.

Operating advantages

• No external power required: simple installation and low operating cost.
• Diaphragm compensation: ensures a stable and precise outlet pressure.
  
• Reduced maintenance: a compact, simple design that minimizes wear points.
• Versatility: suitable for both industrial uses and general service applications.

In short, the M2 valve combines reliability, low maintenance, and ease of integration, making it an efficient solution for keeping pressure under control in water, steam, air, or industrial gas networks.

M2+Bellows reducing valve

The Valfonta M2 pressure reducing valve with bellows is a self-operated bellows model designed to maintain a constant outlet pressure, even when the inlet pressure fluctuates. It is a rugged, reliable solution for applications that require stable control without auxiliary power.

Main technical features:

• Body materials: RG10 bronze, A216 WCB carbon steel, or A351 CF3M stainless steel, with AISI 316L stainless steel internals.
• Seating materials: graphite-filled PTFE as standard, with NBR, EPDM, FKM, or PEEK options on request.
• Connections: DIN PN16-PN40 or ANSI 150/300 flanges, or BSP/NPT threads (BW/SW also on request).
• Installation: it can be mounted in any position, although horizontal piping is recommended, always following the flow direction marked on the body.

Additional options:

• It can be supplied with an external control connection for installations that require more precise regulation or where there are manifolds downstream.

It complies with the PED 2014/68/EU directive and is available in versions with ATEX II 2 GD marking, suitable for classified zones 1/21 and 2/22 in explosive atmospheres.

PRV20 reducing valve

The Valfonta PRV20 pressure reducing valve is a self-operated, piston-balanced model designed to provide a constant outlet pressure even when the inlet pressure fluctuates. It is direct-acting: the inlet pressure acts on the piston and the adjusting spring, closing the valve as soon as the outlet pressure exceeds the set value.

The PRV20 stands out for its simple adjustment by means of an adjusting screw, no need for regular maintenance, and the ability to be installed in any position without affecting its performance.

Common applications

This model is used especially in:

• Chemical laboratories
• Sanitary plants
• Compressed air systems
• Installations that require robust, reliable pressure control without relying on auxiliary power.

ATEX certification

The PRV20 has ATEX certification (II 2 GD) for zones 1 and 21, making it suitable for operation in explosive atmospheres with gases, vapors, flammable liquids, or combustible dusts

PRV30 reducing valve

The PRV30 is a self-regulating, piston-balanced pressure reducing valve designed to maintain a constant outlet pressure even when the inlet pressure fluctuates. It is a direct-acting valve: the inlet pressure acts on the piston and, thanks to the difference in areas, regulates the opening or closing of the valve. When the downstream pressure exceeds the set value, the valve closes automatically to restore equilibrium.

• Outlet pressure range: available in several configurations, 0.5–3 barg, 1–8 barg, and 4–12 barg, allowing it to be adapted to different industrial needs.
• Maximum inlet pressure: up to 25 bar.
• Operating temperature: depends on the elastomer chosen; -30 °C to +80 °C with NBR, -10 °C to +125 °C with EPDM, and up to +150 °C with Viton.
• Construction materials: body, cap, seat, and piston made entirely of AISI 316L stainless steel, ensuring corrosion resistance and durability even in demanding conditions.
• Connections: available with BSP/NPT threads or DIN and ANSI flanges, making it easy to integrate into different installations.

Special options: bronze or super duplex versions, welded connections (socket weld, butt welding), sanitary clamp, degreasing for oxygen service, and specific gaskets (EPDM, Viton, PEEK, Aflas).

In addition, the PRV30 does not require frequent maintenance, can be installed in any position, and is easy to adjust by means of a screw that compresses the adjusting spring.

Its common applications include chemical laboratories, pharmaceutical and sanitary plants, compressed air installations, and water or inert gas networks. Thanks to its robustness and versatility, it is one of the most popular options for industrial environments that require stability, reliability, and minimal maintenance

PRV44 reducing valve

The Valfonta PRV44 is a self-regulating, bellows-balanced pressure reducing valve designed to maintain a constant outlet pressure even when the inlet pressure fluctuates. It is a direct-acting model, in which the inlet pressure acts on the plug and closes it due to the difference in areas, thus providing precise and stable regulation.

Main technical features:

• Maximum inlet pressure: 25 barg.
• Available regulating ranges: 0.5–3 / 1–8 / 4–12 barg, adapting to different operating scenarios.
• Operating temperature: from –30 °C to 210 °C, making it suitable for demanding conditions.
• Materials: body, internals, and cap in AISI 316L stainless steel, with a highly durable micro-plasma welded bellows.

Connections: available with BSP or NPT threads, and with DIN or ANSI flanges.

Operating advantages:

• No frequent maintenance required thanks to its rugged, balanced design.
• It can be installed in any position on the pipe without compromising its operation.
• Simple adjustment by means of an adjusting screw, making start-up and configuration easy.

Options on request:

• Reduced Kv (0.2 / 0.4 / 0.6 / 1 m³/h).
• Alternative materials such as bronze or super duplex for the body and cap.
• Special connections (socket weld, butt welding, clamp).
• Components degreased for oxygen service and special gaskets (EPDM, PEEK, Viton, Aflas).

Common applications:
The PRV44 is especially recommended for group 2 liquids and gases, including compressed air, water, and steam. It is used in chemical laboratories, sanitary plants, compressed air systems, and steam circuits, among others.

This model also has ATEX certification (II 2 GD), making it suitable for zones 1 and 21 with a risk of explosive atmospheres, in strict compliance with European Directive 2014/34/EU

PRV45 reducing valve

The PRV45 pressure reducing valve is a self-regulating, piston-balanced valve designed to provide a stable outlet pressure even when the inlet pressure fluctuates. It is direct-acting: the inlet pressure acts on the valve seat, which responds proportionally to maintain the set point established during adjustment.

This model stands out for its ease of adjustment and low maintenance, and it can be installed in any position without affecting its performance. It is available in sizes DN15 to DN25, with a maximum inlet pressure of 25 bar and a very wide regulating range, from 0.01 to 8 barg. In terms of temperature, it can operate between –20 ºC and 80 ºC with liquids and gases, and up to 180 ºC in steam applications.

Made mainly of AISI 316L stainless steel, with an optional RG10 bronze body, the PRV45 provides high corrosion resistance and a long service life in demanding conditions. Its connections can be BSP/NPT threaded, DIN/ANSI flanged, or sanitary clamp, making it a very versatile valve for different installation configurations.

Its most common applications include:

• Chemical laboratories and sanitary plants.
• Compressed air and inert gas networks.
• Processes with steam and industrial water.
• Installations that require reliable, stable pressure control with minimal maintenance.

This model also has ATEX certification (category II 2 GD, zones 1/21 and 2/22), making it suitable for operation in explosive atmospheres with liquids, flammable gases, or combustible dusts, provided that the thermal limits and the specified installation conditions are observed

VD reducing valve

The Valfonta VD pressure reducing valve is a self-operated, direct-acting unit designed to keep the outlet pressure constant thanks to its regulating piston system, guided at three points to ensure maximum stability and reliability of control.

It has a standard regulating range of 1.5 to 8 barg, which can be extended up to 16 barg, and withstands inlet pressures of up to 40 barg. Depending on the gasket material (NBR or EPDM), the valve can operate at temperatures of up to 80 ºC or even 150 ºC.

It is made of high-strength materials such as bronze, A216 WCB (GSC25N) carbon steel, or A351 CF3M (316L) stainless steel, with AISI 316 stainless steel internals to ensure durability even in demanding conditions.

In terms of connections, the VD offers great versatility:

• DIN PN16–PN40 flanges
• ANSI Class 150 and 300 flanges
• BSP or NPT threaded (up to 2”)

Its most common applications include:

• Water distribution and wastewater installations.
• Compressed air and inert gas systems.
• Fuel oil networks and light industrial installations.
• Sprinkler systems, chemical laboratories, or plants with auxiliary processes.
  

The valve also has ATEX category II 2 GD certification for zones 1, 2, 21, and 22, making it suitable for operation in potentially explosive atmospheres.

Its maintenance is minimal, thanks to a rugged, simple design that does not require frequent adjustments. When components need replacing, Valfonta recommends genuine kits of gaskets, seats, and springs to ensure the service life and optimal performance of the unit.

You will find all models, with their pressure ranges and materials, on our pressure reducing valves page.