Due to the patented construction of the valve which opens and closes in response to water flow, there is no delay in valve closure and water hammer does not occur. The valve operates quietly and fits well into quiet surroundings.

Superior characteristics

Head loss of the valve is equivalent to JIS swing check valves and the valve is adaptable to a variety of applications.

Easy to handle

Even the large valves feature simple, single-disk construction that eliminates breakdowns so maintenance costs can be reduced considerably.

No-Feed Detector

The valve can be equipped with the accurate No-Feed Detector (except SL-UC, NU types) facilitating the safest possible automatic pumping.

Non-water hammer principle (PAT.) ....

The YOKOTA Non-Water Hammer Check Valve adjusts to the flow so that there is no valve closure delay and water hammer does not occur.

Phenomenon of water hammer

In a pumping system without a check valve, when pump input stops suddenly, the flow in the pipe goes through stages of "normal rotation, normal flow", "normal rotation, reverse flow", and "reverse rotation, reverse flow" and reaches a stable state. In such a case, the maximum pressure increase reaches 150-160% of the total pump head, which is comparatively small. However, check valves are normally installed in actual pump systems, and the situation is entirely different