Water&Wastewater_TL_2.23.17

Flow Relief Valves

Available from FPZ, Inc.

The VRL valves are designed to protect blowers and/or motors pressurization, the valve opens and discharges to the outside. When there is excess in vacuum, the valve opens and takes flow from outside.

The valve have been designed for low pressure/low vacuum, with minimal difference between the initial value at which the valve begins to open and its fully-opened position. The valves are supplied with 2 different springs to maximize its efficiency.

These compact valves, made of aluminum alloy, are both easy to install and calibrate. The valves are designed to operate in a wide range of capacities. The VRL can be plumbed to divert excess primary flow through a secondary external outlet when working in pressure conditions or to pipe-in a secondary flow when working in vacuum.

Maximum efficiency is achieved by keeping operating values (flow versus pressure or vacuum) within the operating range (shaded area on graph). Capacity refers to air having a density equal to from over pressurization or excess vacuum. When there is over 0.075 lbs./cu.ft.

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