Height-adjustable gas pipeline valve box

摘要

The housing for the box consists of two parts (1,5) paced inside one another, whereby the top part is screwed into the lower part. The outside of the thread (6) on the top part is formed so that it mates with that (4) of the lower part, allowing the overall height to be adjusted. The thread of the top part consists of grooves on its outer surface, whereas the thread of the bottom part consists of ribs (7) on its inner surface. The top thread is formed over a height appropriate to approximately double the provided height adjustability, whereas the height of the lower thread is appropriate to the same height as the provided height adjustability. The surface of the thread is coated with grease to provide a more practical hold.