Equivalent to two one-way valve combination of the valve
Has a logical "or gate" function. In the logic loop and program control loop widely used in the manual --- automatic loop conversion commonly used.
Because the shuttle valve in the process of commutation there is a road through the process, so when an interface into the air volume or displacement is very small, the valve can not produce before and after the valve to the normal pressure difference, so that the valve can not be completely changed To stop halfway, causing the valve action failure. So in the use of attention, do not use a variable interface at the interface caused by the passage is too small.