Does the 3-Pole bistable switch VRM-313 N require the VME1-000 adapter for installation with a VME valve?

Yes. The 3-Pole bistable switch VRM-313 N requires the VME1-000 adapter for installation with a VME valve. The product description explicitly states that the VME1-000 adapter is required for installation, so you must have this adapter to mount the VRM-313 N to a VME valve.

Is the VME1-000 adapter the only compatible adapter to mount the 3-Pole bistable switch VRM-313 N on VME valves?

Yes - according to the product description, the 3-Pole bistable switch VRM-313 N with short lever requires the VME1-000 adapter for installation on VME valves, which implies VME1-000 is the specified (and thus effectively the only) compatible adapter for mounting this switch on VME valves.

Can the 3-Pole bistable switch VRM-313 N with short lever be installed on other VME valve models without the VME1-000 adapter?

No. the 3-Pole bistable switch VRM-313 N with short lever cannot be installed on other VME valve models without the VME1-000 adapter. The product description explicitly states that the VME1-000 adapter is required for installation. Attempting to fit the switch directly to different VME valve models without this adapter may lead to incorrect mounting, poor electrical or mechanical contact, and potential damage to the switch or valve. To ensure proper fit, safe operation and warranty compliance, always use the VME1-000 adapter when installing the 3-Pole bistable switch VRM-313 N on VME valve models that require it.