Laminar Pte Ltd Singapore

Laminar Pte Ltd


Pressure Relief Valves

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Group 1 1


Pressure relief valves are critical for keeping hydraulic systems safe and efficient. They are specially designed to shield the system from potential harm caused by excessive pressure.

In hydraulic systems, pressure can rise due to temperature shifts, blockages, or glitches. Without proper control, this extra pressure can lead to catastrophic breakdowns and pose significant dangers to equipment and people.

Pressure relief valves act as a protective barrier. They automatically open when the pressure upstream reaches a preset limit. This removes excess pressure safely, preventing it from reaching dangerous levels that could cause system failure.

One key feature of these valves is their ability to work effectively across a wide range of pressures. They can handle different situations, whether low-pressure systems or high-pressure applications.

Safety relief valves are made of resilient materials like ductile iron, steel and stainless steel, ensuring durability and peak performance even in harsh conditions and over time.

These valves close automatically once the system’s pressure returns to acceptable levels. Normal operations can continue without any extra steps.

The pressure-sustaining valve maintains a constant upstream pressure, even if the flow rate changes. It stays “closed” if the upstream pressure is below the set point and opens when the pressure exceeds it. It’s a diaphragm-type hydraulic control valve that’s easy to maintain.

This valve can be activated by the line pressure, operated by its medium through a pressure-sustaining pilot valve, or by an external hydraulic or pneumatic pressure. Typically, it’s used to protect pumps and other components in pipelines.



10, 16, 25


50 to 500


Water | Effluent water


Transmission pipeline | Distribution network | Pumping stations | Treatment plants | High-rise buildings | Pressure management


  • Diaphragm-operated control valve with own-medium control for the regulation of pressure and flow rates in pipeline systems without external power supply.
  • The valve retains a pre-determined inlet pressure. When the upstream pressure is exceeded, the valve opens and permit flow to relieve the excess pressure. The valve is normally closed.
  • With flange ends on both sides according to EN 1092-2
  • Separate connection of control circuit and pressure gauges
  • Designed to reduce cavitation by using slotted cylinder
  • Body and bonnet of Ductile Iron
  • Diaphragm of EPDM
  • Control circuit and pilot valve body of stainless steel or brass
  • Can be modified to be electrically controlled or pneumatically operated


A Pressure Relief Valve (PRV) is designed to protect equipment and systems from excessive pressure buildup. The system opens when pressure exceeds a predetermined maximum limit, releasing excess fluid or gas and preventing potential damage.

It ensures that the maximum pressure within the system does not exceed its allowable working pressure, even under abnormal circumstances such as equipment malfunctions or sudden pressure increases.

On the other hand, a Pressure pressure-sustaining valve (PSV) is responsible for maintaining a specific pressure level within a system under normal operating conditions. It is designed to control and regulate the flow rate to ensure that the correct pressure is always maintained.

By continuously adjusting its position based on feedback from sensors or controllers, a PSV can compensate for variations in demand or changes in upstream pressures, ensuring stable and consistent operation.

While both valves are essential for maintaining proper system functionality, their functions differ significantly. A PRV is an emergency safeguard against excessive pressures that could cause catastrophic failures. At the same time, a PSV ensures that normal operating pressures are consistently met.

Understanding these differences allows engineers and operators to select and install the appropriate valve for each specific application, promoting systems’ safety, efficiency, and optimal performance under varying conditions.

The pressure relief valve plays a crucial role in maintaining the safety and integrity of various systems and equipment. It protects against excessive pressure increase, ensuring that downstream pressure remains within safe limits.

One common application of a pressure relief valve is in steam boilers. As steam is generated, the pressure inside the boiler can rise rapidly. If left unchecked, this increase in pressure can lead to catastrophic failures. By installing a pressure relief valve, the preset pressure at which it opens can be set to release excess steam and prevent overpressurisation.

Another example of when to use a pressure relief valve is in hydraulic systems. These systems often operate under high pressure, and sudden spikes or fluctuations can occur due to various factors, such as temperature changes or pump malfunctions. A properly selected and installed pressure relief valve helps control the system’s allowable working pressure by diverting excess fluid back to the reservoir.

Pressure control is vital in many industries, including oil and gas, chemical processing, manufacturing, and power generation. Pressure Relief Valves are essential components that ensure safe operations by preventing equipment failure due to excessive pressure.

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