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All parts of the system shall be provided with indicating type valves so that any portion of the system can be taken out of service for repairs or in an emergency without interfering with the operation of the remainder of the system. Each system shall be provided with a gate valve so located as to control all sources of water supply except siamese connections.
Each floor and level of a building shall be provided with a separate control valve for that floor or level.
All valves in connections to water supplies and in supply pipes to sprinklers shall be outside screw and yoke or other indicating type except the valve at the connection to the city main.
Check valves shall be installed in all sources of water supply. They shall be straightway, wafer style, or silent pattern installed in horizontal piping unless of a type designed for installation in a vertical position.
A control valve shall be installed on each side of each check valve unless otherwise herein provided.
Where a gravity tank is located on a tower in a yard, the gate valve on the tank side of the check shall be of the outside screw and yoke type; where located on top or inside of a building both gate valves shall be of this type.
Where pressure tanks serve as a source of supply, a check valve shall be provided near the tank; no valve need be provided between the check valve and the tank.
Where a city main serves as a source of supply, no valve except the city gate valve need be provided on the street side of the check valve.
All siamese connections shall be connected to the system on the discharge side of all city control valves; the check valve shall be located as far as possible from the source of supply.
Valves controlling water supplies for sprinklers shall be located within building stairwells or in other locations where readily accessible. They shall not be located within a space occupied by an individual tenant unless the valve controls sprinklers located only within that space.
All valves in supply pipes to sprinkler systems shall be secured open. All valves shall be plainly marked to indicate the area controlled.
(Prior code § 91-24; Amend Coun. J. 10-30-96, p. 31216, § 1; Amend Coun. J. 9-6-17, p. 55278, Art. VII, § 25)