Why relief valves are used

Pressure relief valve operation is also utilised in multiphase applications and chemical processing systems. To speak to a member of our technical team about pressure relief valve features, or the purpose of a pressure relief valve, contact us today on or email [email protected]. To request a free quote or view our general range of products, speak to our team. By subscribing to our newsletter you are agreeing to personalised email updates from MGA Controls. My Account News Contact Us.

For more information about our system, or for a free live webinar demo of the AccuTEST system in action, contact us today. Safety Valve vs. Relief Valve: Is There a Difference? That said, relief valves and safety valves do function slightly differently: Relief Valves are designed to control pressure in a system, most often in fluid or compressed air systems. These valves open in proportion to the increase in system pressure. Instead, they open gradually, allowing the system to return to the preset pressure level.

Tamper resistant kits are also available on some pressure relief valves. Browse our range of pressure relief valves to find out more.

What is a Pressure Relief Valve? Also known as How do pressure relief valves work? Installation Many Valves are damaged when first placed in service because of failure to clean the connection properly when installed.

Because foreign materials that pass into and through safety Valves can damage the Valve, the systems on which the Valves are tested and finally installed must also be inspected and cleaned. New systems in particular are prone to contain foreign objects that inadvertently get trapped during construction and will destroy the seating surface when the Valve opens.

The system should be thoroughly cleaned before the safety Valve is installed. The gaskets used must be dimensionally correct for the specific flanges. The inside diameters must fully clear the safety Valve inlet and outlet openings so that the gasket does not restrict flow.

For flanged Valves, draw down all connection studs or bolts evenly to avoid possible distortion of the Valve body. For threaded Valves, do not apply a wrench to the Valve body.

Use the hex flats provided on the inlet bushing. Safety Valves are intended to open and close within a narrow pressure range. Valve installations require accurate design both as to inlet and discharge piping. Refer to International, National and Industry Standards for guidelines. Inlet piping Connect this Valve as direct and close as possible to the vessel being protected.

The Valve should be mounted vertically in an upright position either directly on a nozzle from the pressure vessel or on a short connection fitting that provides a direct, unobstructed flow between the vessel and the Valve. Installing a safety Valve in other than this recommended position will adversely affect its operation. The Valve should never be installed on a fitting having a smaller inside diameter than the inlet connection of the Valve.

Discharge piping Discharge piping should be simple and direct. A "broken" connection near the Valve outlet is preferred wherever possible. All discharge piping should be run as direct as is practicable to the point of final release for disposal. The Valve must discharge to a safe disposal area.

Discharge piping must be drained properly to prevent the accumulation of liquids on the downstream side of the safety Valve.

The weight of the discharge piping should be carried by a separate support and be properly braced to withstand reactive thrust forces when the Valve relieves. The Valve should also be supported to withstand any swaying or system vibrations. If the Valve is discharging into a pressurized system be sure the Valve is a "balanced" design.