A VALVE

摘要

A valve (6, 100) comprising an inlet (42, 108) and an outlet (110) and a path of fluid communication between the inlet and outlet, means for selectively allowing fluid to flow along the path of fluid communication and means for preventing fluid from flowing along the path of fluid communication, and an opening (9, 104) from the valve to atmosphere, whereby when fluid is prevented from flowing along the path of fluid communication, an atmosphere gap is created between the inlet and the outlet.