The purpose of valve hooks: Large industrial valve hooks are suitable for industries such as petroleum, chemical, metallurgy, power generation, refining, shipbuilding, petrochemicals, and machinery. The purpose of valve hooks: Large industrial valve hooks are suitable for industries such as petroleum, chemical, metallurgy, power generation, refining, shipbuilding, petrochemicals, and machinery. Valve hooks, valve wrenches, and f-wrenches are tools used in equipment installation, installation, maintenance, and repair work. Valve hooks are ideal tools for opening, closing, maintaining, and repairing valves.