Common mistakes when using pressure control valves in industrial installations

Pressure control valves play a crucial role in ensuring the smooth operation of complex industrial systems, making them indispensable in many production processes. These devices precisely and automatically manage critical variables such as flow, pressure, and temperature, adapting seamlessly to varying operational conditions across different industrial processes.

The accurate regulation provided by these valves not only ensures operational safety but also maintains the quality and consistency of the final product. Additionally, they optimise energy efficiency within the facility, reducing unnecessary operational expenses and extending the lifespan of machinery and associated systems.

However, incorrect selection, installation, or maintenance of these valves can lead to serious and varied consequences. Common problems include operational inefficiencies, increased energy consumption, and accelerated wear and tear on system components. Furthermore, poor valve selection or installation errors can create significant safety risks, ranging from leaks and pressure failures to extreme scenarios like explosions or serious accidents.

In this technical guide, we thoroughly examine the most frequent mistakes made when using pressure control valves. Additionally, we provide clear and practical recommendations to help avoid these common pitfalls, highlighting best practices during selection, installation, and maintenance phases. Our goal is to offer useful guidance to substantially improve operational efficiency, maximise the safety of personnel and facilities, and significantly extend the operational life of any industrial system relying on precise pressure control.

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A pressure control valve is a mechanical device designed to automatically regulate fluid flow by adjusting pressure, flow rate or temperature with precision within a pipeline.

Its basic function relies on an internal moving element (typically a plug or disc) operated by an actuator that responds to external control signals.

Unlike a pressure reducing valve, which maintains a constant downstream pressure, or a relief valve, which discharges excess pressure in emergency scenarios, a pressure control valve provides continuous, dynamic regulation in response to changes in process conditions.

These valves are commonly used in demanding industrial environments such as chemical and pharmaceutical plants, steam systems, HVAC installations and automated production processes — where precise fluid control is essential to both performance and safety.

One of the most frequent mistakes when selecting a pressure control valve is overlooking the real operating conditions of the system. Every installation has specific pressure, temperature and fluid characteristics that significantly affect valve performance.

Key factors to consider:

• Fluid pressure and temperature:
  It is essential to select a valve that can comfortably handle the actual pressure and temperature ranges of the process. For example, Valfonta’s C1 pneumatic control valve can operate reliably at pressures up to PN40, and at temperatures depending on the material:
  • Carbon steel GP240GH: from -10°C to 400°C
    Stainless steel AISI 316: up to 400°C

• Fluid type (corrosiveness, viscosity, purity):
  The physical and chemical properties of the fluid must be carefully assessed to prevent premature wear. Valve components must be resistant to corrosion or erosion caused by aggressive, viscous or impure fluids.
  The C1 model, for instance, is available in stainless steel — ideal for corrosive fluids or hygienic environments.
  

Neglecting these variables may lead to frequent malfunctions, shorter valve lifespan and increased maintenance costs over time.

Gas control valve C1

Pressure excess valve S1

Selecting the right actuator is critical to ensuring reliable and precise valve performance. A common mistake is failing to define which type of actuator is best suited to the system’s operational needs.

When should you choose a pneumatic actuator?

Pneumatic actuators are particularly recommended for industrial environments due to their high reliability, fast response, excellent modulation accuracy, and intrinsic fail-safe behaviour.
They are especially suitable for ATEX-classified areas where electrical components are not permitted.

Advantages of the multimembrane pneumatic actuator (as used in Valfonta’s C1 model):

• Excellent modulation accuracy
• Reliable performance under harsh conditions
• Fail-safe capability: safe opening or closing in the event of power failure
• Easy integration with 4–20 mA positioners for precise control

Overlooking these benefits and opting for an unsuitable electric or hydraulic actuator can result in subpar performance, system instability and increased operational risk.

Another frequent oversight is not determining early on whether the valve is intended to function in modulating mode (continuous adjustment) or simply as on/off (fully open or fully closed without intermediate positions).

This distinction is crucial as it determines the actuator type, internal construction, and maintenance needs.

• Modulating valves adjust position continuously based on the control signal. They are vital in processes requiring high precision and real-time adjustment — for example, temperature regulation or flow control in chemical applications.
• On/off valves operate in a binary mode — either fully open or fully closed — and are appropriate for simpler systems where full flow or full shut-off is required, such as safety circuits or secondary process lines.
  

Valfonta’s C1 pneumatic control valve is specifically engineered for both functions. Its robust body and multimembrane actuator can be easily configured for modulating or on/off service, using an optional electro-pneumatic positioner.

Failing to define this requirement clearly may lead to choosing the wrong valve configuration — resulting in premature wear, control inaccuracy and elevated maintenance or replacement costs.

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Proper installation of pressure control valves is critical to ensuring their performance, reliability and service life. However, there are several common mistakes that can negatively impact valve operation right from the start.

One of the most frequent errors is failing to respect the correct valve orientation or flow direction as indicated on the body of the valve.

This can lead to serious operational issues such as excessive noise, vibration, premature wear and loss of flow control accuracy.

According to the technical manual for the C1 model by Valfonta, the following recommendations should be strictly observed:

• The valve should be installed horizontally, with the actuator positioned vertically above the pipeline to ensure proper operation.
• The flow direction arrow marked on the valve body must be respected, ensuring that the plug and seat function correctly and without unnecessary wear.
• Adequate clearance should be left around the valve to allow easy access for maintenance and safe removal of the actuator, thanks to its top-entry design.

Failure to follow these guidelines may result in early operational failures and significantly increase maintenance costs.

Pressure excess valve PRV55

Pressure relief valve S3

Another frequent oversight is installing the valve without first cleaning the pipeline thoroughly.

Solid debris, welding residues or other impurities present in the line can quickly accumulate in the internal components — especially the plug and seat — leading to damage, blockages or leaks.

The C1 manual explicitly recommends:

• Performing a full internal cleaning of the pipeline before installing the valve, removing any solid particles or contaminants.
• Installing a strainer upstream of the valve to protect internal components and maintain stable operation.

Skipping this step often results in recurring issues, reduced control accuracy and costly corrective maintenance.

Preventive maintenance is essential for ensuring the correct operation and durability of industrial control valves. However, poor planning or execution of maintenance procedures can lead to performance issues and premature failures.

Lack of regular or preventive inspections

Many industrial facilities underestimate the importance of preventive maintenance, carrying out only corrective actions when a failure has already occurred. This approach can lead to cumulative damage that becomes difficult or costly to reverse.

Valfonta strongly recommends periodic inspections of key components in its C1 valve, including:

• Plug and seat: check for wear, surface damage or build-up of dirt.
• Gaskets and packing: assess integrity and condition to prevent leaks.
• Membranes within the pneumatic actuator: check for deformation or ruptures.
• Overall condition of the multimembrane pneumatic actuator: inspect for signs of corrosion, visible damage or functional issues.

A typical recommended inspection interval is once per year, although this may vary depending on the severity of the application and operating environment.

Using non-original or incompatible spare parts is a common mistake in maintenance routines. Although these alternatives may seem more affordable initially, they often result in early failures, accelerated wear and reduced efficiency.

Valfonta clearly states in the C1 technical manual that only original and certified replacement parts should be used. The advantages are significant:

• Longer service life
• Guaranteed operational performance to original specifications
• Lower long-term costs due to reduced repairs
• Full manufacturer warranty and access to technical suppor.
• Ignoring this recommendation can significantly increase operating costs and cause unexpected failures that disrupt the entire process.

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To conclude, here are some straightforward recommendations to help you get the best possible performance, safety and longevity from your pressure control valves in industrial applications.

At Valfonta, we bring over 50 years of proven expertise delivering tailored pressure control solutions for demanding industrial environments.

Throughout these decades, we’ve supported companies in the chemical, pharmaceutical, energy and food sectors, helping them enhance the efficiency, safety and reliability of their systems.

If you’re unsure which type of valve—control, relief or pressure-reducing—is best suited to your specific installation, our technical team is here to advise you. Whether your system involves aggressive fluids, operates in ATEX-classified zones, or requires minimal maintenance, we’ll guide you through the selection process step by step.

Feel free to contact us with no obligation. We’ll provide clear, objective technical guidance, helping you identify the most effective and cost-efficient solution for your operation.

Call or email us today to take the next step towards a more efficient, safer and longer-lasting industrial setup. At Valfonta, we’re ready to help.