Pressure Gauges

Pressure gauges for steam and boiler systems come in various types, sizes, and pressure ranges to accommodate different system configurations and operating conditions.

Hawleys range of high-quality, stainless steel pressure gauges with rear or bottom entry, are grouped in this category to make it easier for customers to find the exact pressure gauge in the easiest way. Find a solution for all your steam and boiler repairs with us!


Pressure gauges for steam and boiler systems

Pressure gauges for steam and boiler systems are specialized devices used to measure and display the pressure levels within steam boilers and associated piping systems. 

They are installed at strategic locations throughout the steam and boiler system, providing visibility into pressure conditions at critical points. So, we can say they play a crucial role in monitoring the pressure conditions in boiler and steam systems, ensuring safe operation and optimal performance.

Stainless steel pressure gauges usually have a robust construction to withstand the high temperatures and pressures, which are common in steam and boiler applications. They should be accompanied by a pigtail syphon to protect the pressure gauge from the high media temperature. We manufacture these out of 316L schedule 80 pipe that is threaded on both ends and bent to the pigtail shape.

They often utilize a Bourdon tube mechanism, which consists of a curved tube that straightens under pressure.


The goal of pressure gauges

The readings provided by pressure gauges help operators monitor the pressure within the boiler and piping network, ensuring that it remains within safe limits. This information will help out in 

  • planning all the adjustments to the boiler's operation, 
  • in maintaining optimal pressure levels and 
  • in preventing overpressure situations, 

which can lead to system damage and in the end, in safety hazards.


Functions and characteristics of pressure gauges

  • Measurement of Pressure: The primary function of pressure gauges in steam and boiler systems is to accurately measure the pressure of steam or water within the system. This pressure measurement is essential for monitoring the system's performance and ensuring it operates within safe limits.
  • Safety Monitoring: Pressure gauges play a critical role in safety monitoring by indicating whether the pressure levels within the system are within acceptable limits. This helps prevent overpressure situations that could lead to equipment damage or even catastrophic safety failures.
  • Regulation and Control: Pressure gauges assist in regulating and controlling the pressure within the system. Operators can use pressure readings to adjust valves, dampers, and other control mechanisms to maintain optimal operating conditions.


Air pressure gauges - what is the purpose of those gauges

Air pressure gauges, in steam and boiler systems, measure the pressure of the air supplied to the combustion chamber. 

They ensure proper fuel combustion, regulate airflow, monitor safety, optimize system efficiency, prevent overpressure, and aid in maintenance planning. 

Their goal is to maintain safe and efficient operation of the system by providing real-time feedback on air pressure levels.


Water pressure gauges - what we need to know

Water pressure gauges are devices used to measure and display the pressure of water in plumbing systems, water distribution networks, or hydraulic systems. 

These gauges are constructed to withstand exposure to water and are typically made of materials like stainless steel, bronze or brass to resist corrosion. 

They come in various types and mounting configurations to suit different applications, and are essential for maintaining optimal water pressure levels, but also for detecting leaks, diagnosing system issues, and ensuring efficient operation in residential, commercial, and industrial settings.


Pool filter pressure gauges - why we use them

A pool filter pressure gauge is a device used to measure the pressure inside a pool's filtration system. 

It helps assess the condition of the filter media by indicating how clogged or dirty it has become over time due to trapped debris and contaminants. 

Typically, they are installed on the filter tank or valve, pool filter pressure gauges are designed to withstand exposure to all pool chemicals. 

They provide a reading (usually in pounds per square inch (psi), which informs pool owners when it's time to clean or backwash the filter for optimal filtration efficiency. 

Regular monitoring of the pressure gauge is crucial for proper pool maintenance, ensuring clean and clear pool water.


Hydraulic pressure gauges - their role in the hydraulic system

A hydraulic pressure gauge is a device used to measure and display the pressure within a hydraulic system.

It helps ensure that the pressure remains within safe and optimal levels for the proper functioning of the hydraulic system.

Hydraulic pressure gauges are built to withstand high pressures, vibration, and harsh operating conditions commonly found in hydraulic systems. 

They provide accurate and reliable measurements, helping operators monitor system performance and prevent potential issues. 

Hydraulic pressure gauges are essential tools used in various industries, including manufacturing, construction, and aerospace, where hydraulic systems are widely used for power transmission.



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What is a pressure gauge, and what is its primary function in industrial and mechanical applications?

A pressure gauge is an instrument used to measure and display the pressure of a fluid (liquid or gas) in a closed system. Its primary function is to provide real-time information about the pressure, enabling operators to monitor and control processes effectively.


What is the Bourdon Gauge

The bourdon pressure gauge is the most common type - it is a mechanical gauge that utilizes a curved tube that straightens under pressure, allowing you to see the readings on a dial.

Bourdon pressure gauges are known for

  • High accuracy - these gauges are highly sensitive to pressure changes, which allows them to provide readings within 2% of the full scale. 
  • Vibration and corrosion resistance - bourdon pressure gauges are resistant to both corrosion and vibration, making them suitable for environments where these can be expected.
  • Affordability - these gauges are made for a wide range of applications, making them an affordable solution to many engineering needs.
  • Ease of use - bourdon pressure gauges are easy to install, the readings on the dial are simple to understand, and they require minimal maintenance.


Dry vs. Liquid-Filled Pressure Gauges

Dry pressure gauges are sealed and contain air. They are less complex than liquid-fille gauges and typically more affordable, however, they are not as accurate and require regular calibration. Liquid-filled gauges are filled with oil or glycerine that lubricates movement, making them more accurate. They are also more resistant to vibrations and can withstand bigger temperature changes. At Hawleys, all of our bourdon pressure gauges are glycerin-filled.  


Why are pressure gauges made from stainless steel?

The housing material of the pressure gauge is another key factor that contributes to its longevity and performance.

If the housing for our gauges is made of stainless steel, because this material is:

  • Highly resistant to corrosion
  • Strong, robust, and durable material that can keep its structural integrity even in challenging conditions. These characteristics also give stainless steel pressure gauges a long life span!
  • Labeled as "minimal maintenance" due to its corrosion resistance and durability, when compared to other material types.  

What is the difference between rear and bottom entry pressure gauge?

The difference between rear and bottom entry pressure gauges lies in how they are installed and where the pressure connection is located:

  1. Rear Entry Pressure Gauge:

    • Rear entry pressure gauges have their pressure connection located at the back of the gauge.
    • They are typically installed in a way that allows the gauge face (the part displaying pressure readings) to be easily visible from the front or top of the gauge.
    • Rear entry gauges are commonly used in applications where the pressure source is located behind the gauge, allowing for a straightforward installation.
  2. Bottom Entry Pressure Gauge:

    • Bottom entry pressure gauges have their pressure connection located at the bottom of the gauge.
    • They are installed in a way that the gauge face is typically positioned horizontally or vertically, with the pressure connection facing downwards.
    • Bottom entry gauges are often used when the pressure source is located beneath the gauge or when space limitations or installation requirements dictate a specific orientation.

What are the different types of pressure gauges available?

Bourdon Tube Gauges:  they operate using a curved tube (Bourdon tube) that straightens under pressure, which is then converted into mechanical movement to indicate pressure on a dial.

Diaphragm Gauges: use a flexible diaphragm that deflects under pressure to measure changes in pressure. They are often used in applications where the pressure is relatively low or where vibration resistance is required.

Capsule Gauges: use a flexible capsule instead of a diaphragm to measure pressure changes. They are typically used in low-pressure applications.

Digital Gauges: use electronic sensors to measure pressure and display the reading digitally on a screen. They offer high accuracy and can often provide additional features such as data logging and remote monitoring.

Differential Pressure Gauges: can measure the difference in pressure between two points in a system. They are commonly used in applications such as flow measurement and filter monitoring.

Absolute Pressure Gauges: can measure pressure relative to a perfect vacuum, rather than atmospheric pressure. They are often used in scientific and laboratory applications.

Sealed Pressure Gauges: designed to prevent the ingress of contaminants into the gauge mechanism. They are commonly used in harsh environments or applications where cleanliness is essential.


Where are pressure gauges commonly used, and what industries benefit from their applications?

Pressure gauges are commonly used in industries such as manufacturing, oil and gas, petrochemicals, pharmaceuticals, HVAC, aerospace, and more. They are essential for monitoring pressure in boilers, pipelines, hydraulic systems, and various mechanical equipment.


How do I choose the right type and range of pressure gauge for my specific measurement needs?

To select the right pressure gauge, consider factors like the pressure range, compatibility with the measured media, accuracy requirements, and environmental conditions. If you are not sure, contact us for a consult.


What is the difference between analog (dial) pressure gauges and digital pressure gauges, and when should I use each type?

Analog pressure gauges use a dial and pointer to display pressure, while digital pressure gauges provide numeric readings on an electronic display. Analog gauges are suitable for quick visual reference, while digital gauges offer precise readings and data-logging capabilities.


Are there safety precautions or installation guidelines I should follow when installing pressure gauges in various industrial settings or critical applications?

Yes, safety precautions and installation guidelines are essential. Pressure gauges should be installed correctly, and safety measures taken to prevent overpressure or damage to the gauge. Follow manufacturer recommendations and industry standards.


What is the recommended calibration schedule for pressure gauges, and how can I ensure accurate and reliable measurements over time?

Pressure gauges should be calibrated at regular intervals, typically annually, or as specified by the manufacturer. Calibration ensures accuracy, and reputable calibration services can provide certification.


Can pressure gauges be integrated into control systems or data logging for remote monitoring and automation purposes, and what communication options are available?

Yes, pressure gauges can be integrated into control systems using protocols like 4-20mA or HART for remote monitoring. Digital pressure gauges often have built-in data logging and communication options such as USB or RS-485.


What are the industry standards and certifications that pressure gauges may need to meet, and how can I verify compliance for my specific application?

Pressure gauges may need to meet standards such as ASME B40.100 or DIN EN 837. Verify compliance by checking the gauge's specifications and documentation or consulting with the manufacturer or supplier.