These ball valves are used to create custom vacuum clamping jigs on CNC routers and workbench hold-downs. Each unit consists of a chromium ball bearing, tapered return spring, cir-clip and 13mm outside diameter housing body. The return spring holds the ball bearing up flush against the tapered breach in the neck of the housing. This represents the 'closed' position of the valve. By applying downward pressure to ball bearing, the valve is opened and vacuum pressure is applied to the work piece.
Keep in mind that these valves do not create a perfect seal when closed.
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