It’s a tiresome discussion, but the question keeps coming up:
Only when the installation direction is correct the power valve can manipulate the effective compression at low speeds, at high speeds the slider has virtually no effect, as described in this article about its function.
The following pictures show why and in which direction the outlet slide has to be installed.
Now you might ask yourself: How do you get the idea to install the power valve the wrong way round?
The drawings in the spare parts catalogue or the exploded drawings there can lead to confusion. Basically, exploded drawings show assemblies in a disassembled state. Since the power valve has to be turned around to secure the wire rope hoist when removing or installing it in the housing, it is not shown in the direction of installation, but in the direction in which it would be removed. As it is always shown in exploded drawings.