Removing the Cover on a Hydrotek 4000 Series Valve

Stuck Bonnet on Hydrotek 4000 Valve

The user removed the screws but the cover won't lift off without excessive force, risking breakage.

Manufacturer's Parts Breakdown

Hydrotek 4000 series valves are less common. The manufacturer provides a parts diagram that shows how the bonnet seals and any retention clips. Refer to the official technical document for the correct disassembly method.

Link: Hydrotek 4000 Series Technical Breakdown

If the diagram doesn't clarify, apply penetrating oil around the bonnet-to-body joint, wait 15 minutes, then try gently rocking the bonnet side-to-side while lifting.