How Does Isolating Valve In Plumbing Work?

Valves fitted at the outlet of water tanks  have traditionally been gatevalves  and are either located close to the cold water tank or in the pipework adjacent to the outlet from hot water tanks.  If the valves cannot be located, check the pipework where it passes through the ceiling into the room below, sometimes they may be located in a cupboard or, if the pipework is boxed in, behind a cover held in place by screws. Gatevalves are turned off by turning the head