A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll. The simplest, and very ancient, valve is simply a freely hinged flap which drops to obstruct fluid (gas or liquid) flow in one direction, but is pushed open by flow in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems. Źródło: https://en.wikipedia.org/wiki/Valve
In the phone book you can find phone numbers for such branches emergency hydraulic, which are open around the clock and seven days a week, including holiday periods.
Depending on the type of failure, they can order the execution of hydraulic works in normal mode, or call the emergency hydraulic.Such hydraulic ambulance is able to reach a flooded home, even during the weekend.
While minor work will be done by appointment convenient for the homeowner term..