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US Saws â The Digital Cut. VEX400 â Battery Operated Valve Exerciser. U.S. Saws recognized a clear need for a portable, battery operated valve turning system that was powerful, easy to set up, and versatile. U.S. Saws has created the VEX400 to streamline a valve exercising program. The tool is easier to use and as powerful as some truck mounted systems.
An OS&Y Valve (outside screw & yoke) functions by opening and closing via a gate, which lowers both in and out of the valve. When the handle is turned clockwise the gate will close preventing any water from traveling through the valve. When the handle is turned counter clockwise, the gate will open allowing the water to flow through freely.