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There are a number of elements that go into valve material / type selection to ensure that the desired performance level is achieved against the processes they are designed to protect. Introduce the key factors to consider when sizing and selecting a Safety valve.

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Failure of a PRV to perform as designed, can result in over pressure of vessels , heat exchangers, boilers or other equipment they were specified and installed to protect. This can result in catastrophic failure and life threatening situations.

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We pride ourselves on having the experience and capability to repair and pressure test industrial valves of all types and brands, both onsite and in our Newcastle facility.

There are several notable differences between terminology used in both Europe and the US. One of the most important differences is a valve that is referred to as a Safety valve in Europe is referred to as a Pressure Relief Valve in the US. The term Safety valve in the US generally refers specifically to a full-lift type Safety valve used in Europe.

The principal pressure containing components for Safety relief valves are traditionally constructed from and utilised generally in the following applications:

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Protect kitchen, laundry, indoor and outdoor taps as well as household pipework and fittings that are susceptible to the impact of hard water.

Pressure relief valves (PRVs) serve to protect life and property. PRV’s are installed wherever the Maximum Allowable Working Pressure (MAWP) of a process system or pressure vessel could potentially be exceeded.

The valve will automatically discharge a quantity of gas or fluid at a designed safe pressure limit and in most cases  re-close to prevent additional fluid or gas being discharged after normal process conditions have been maintained.

During engineering design and through the process of not only materials, process conditions will then determine the correct valve size to be ‘fit for purpose’.

Issues that may arise could be valve chatter or flutter. Chatter can occur if the valve inlet sizing restricts flow and the valve closes Valve flutter occurs when the pressure on the discharge side of the valve drops away and the disc moves towards the close position. Then the pressure builds and the valve opens / operates again to discharge.

The set pressure of a safety or pressure relief device is governed by the material that is being monitored i.e. steam, air and intended to protect the process from immediate danger and injury to persons or equipment. With these known characteristics the use of the relevant standard will determine the set / re-seat pressure.

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Once repairs and servicing work is complete, every valve is pressure tested to the relevant Australian or International Standard.

With the above process criteria known valve manufacturers / suppliers are able to model with software the range of process conditions to provide expert recommendations. This will provide a product ‘fit for purpose’ that can be engineered to site specifications. From here the valves in operation can be monitored to determine if there are additional fine tuning required due to valve sizing slightly not being correct for application.

Pressure relief valves, Safety valves, Safety relief valves and pressure Safety valves are devices that are designed to protect a process and equipment from excessive pressure build up from fluid or gas.

This article discusses underground and above-ground installations of a double-check valve assembly.

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A check valve, which allows water to move in only one direction to prevent backflow, is necessary if you are installing a sump pump. A supply stop is needed for ...

Watervalve

Circulating pumps are typically centrifugal pumps which are used to keep fluids in constant flow within a closed system. They are often ...

Safety and Pressure Relief Valves within Australian industry are set and maintained in accordance with the following standards: