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Hydraulically Controlled Air/Vacuum Valve- 7000

"For positive pipeline protection against damaging pressure surges." The operating principle of this valve is the same as the CONVENTIONAL Air and Vacuum Valve with one exception ... Hydraulically Controlled Air and Vacuum Valves are normally open (because the heavy cast float is not buoyant), and slowly close, only after spilling a regulated volume of water to prevent a pressure surge. This valve provides excellent pipeline protection against primary and secondary surge pressures which usually occur when filling or draining a pipeline. The closing time of this valve is variable and adjustable by means of a hydraulic control system.

Sizes 4" thru 20". Ratings 125# and 250# class.

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Technical Drawing