Abstract
A theory of the two-dimensional potential flow considering free streamline has been applied to the flow field through a gate valve. From this theory the shape of the separating streamline, contraction coefficient of flow and the critical cavitation number have been obtained. And then by applying the law of momentum to the downstream portion from the gate, the loss coefficient in a gate valve has been estimated. After these theoretical values have been compared with the experimental results on the flow of the squaresection gate valve, it concluded that this theoretical treatment might be regarded as available.
