The training that uses virtual reality technology is expected to be useful for preventing the accidents caused by human factor. However, there is a problem that a trainee cannot train due to lack of the UI such as realizing the real valve operations in industrial plant. We propose an image recognition method to measure the valve opening manipulation velocity for developing UI to realize the training of valve manipulation in virtual environment. The method to measure the angular velocity of the circular handle uses the optical natural feature points on the handle turning the valve. The advantages of our valve manipulation UI are that one is low cost and another it can be applied to various valves with circular handle.