摘要:
A simple and effective volume/pressure relief means (28) is provided at one of said valve members (22′), which volume/pressure relief means (28) establishes a hydraulic relief connection between said first or second valve port (33, 34) and said third valve port (35) of the respective sub-valve (20a or 20b), when said sub-valves (20a, 20b) are in said intermediate position, and is inactive, when said sub-valves (20a, 20b) are in the first or second end positions.