How should a major domestic water system valve be opened to minimize jolt to the system?

Opening a major domestic water system valve in small increments and very slowly is the most effective approach to minimize jolt to the system. This gradual method allows for the controlled introduction of water pressure, which helps prevent sudden changes in flow that can cause water hammer or shock waves throughout the plumbing system. Such shocks can lead to damage to pipes, fixtures, and joints, resulting in costly repairs and maintenance.

By slowly adjusting the valve, the system can gradually acclimate to changes in flow and pressure, thereby protecting the infrastructure from the stresses associated with rapid flow changes. This practice aligns with the principles of maintaining system integrity and ensuring longevity in plumbing systems, especially in complex or large-scale installations where the effects of sudden pressure changes can be exacerbated.