Quick Relief (QR) Valves are the universal solution for protecting all types of pump stations, filters and pipelines. A QR Valve ensures that a potential pressure rise in the system will not damage the critical components of your irrigation system. This is accomplished by maintaining or continuously ‘sensing’ the pressure in the line upstream of the valve and quickly opening the valve and venting the excess pressure from the system. Once the pressure declines and returns to normal, the QR valve will return slowly to its closed position.
A QR Valve is predominantly installed upstream of the filter with a tee out of the mainline. During standard operation, the QR Valve will be normally closed. Pressure in the mainline is being continuously “sensed” by the QR Valve.
During an event of pressure surge, such as immediately after pump start-up or a field valve closure, the pilot senses the rise in pressure and the QR Valve quickly opens fully in order to relieve the pressure. The desired pressure for opening is referred to as the “set point” of the valve.
The valve remains fully open until the pressure drops back to normal. When the pressure returns to normal, the valve closes at an adjustable pace.
Netafim AGF Sand Media Filter tank system with an installed QR Valve and Netafim manifolds has an extended warranty – 5 years instead of the standard 2 years.
A Quick Relief (QR) Valve ships pre-assembled by Netafim USA following strict quality standards. The QR Valve consists of a basic valve, a quick relief pilot and a needle valve (some pilots come with an integral needle valve where the needle valve is inside the pilot); Valves 6” and larger use an additional 2” Galil valve so the chamber of the valve will vent quickly even if the valve is large.
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