Its probably not something anyone here has done. People wont know what the question is before they read the post, so obviously you are likely to get a lot of views without an answer. This is the first time I have seen a post on the subject. The last time I heard about one of these valves was on a 1984 MG Metro. To get to the point, I fail to see the point of the valve. I can only assume it is to protect the clutch from people unable to control their releasing the pedal smoothly. I cant see too much of an issue in removing it or probably better to replace it with one that works properly.