Conventional Check Valves

With conventional check valves, there is a tendency for valves to begin to close only when pressed by reverse flow. Instantaneous stoppage of reverse flow causes pressure to rise resulting in a water hammer noise similar to striking a pipe with a hammer, and in some cases, this causes a blowout in the discharge line.

The YOKOTA non Water Hammer Check Valves

According to our patented non-water hammer principle, the valve disk of the YOKOTA Non-Water Hammer Check Valve is designed to be submerged in, and suspended by the water flowing in the pipes during maximum flow. When normal flow begins to slow down, the valve disk begins to close in response to this. The instant that flow reverses, in other words, when the water in the pipe stops, the valve disk closes completely and water hammer does not occur. This is similar to the shock eliminating effect of a ball that is thrown upward and caught at the moment when it begins to fall.