Jash Engineering Ltd. Manufactures Fabricated Weir Gates. Jash Engineering Ltd. Is an ISO 9001 manufacturer of Water & Sewage Control Gates, Shut Off Valves for Bulk Solids and Cast Iron T-Slotted Plates. The Fabricated Weir Gates are downward opening type gates. These are used in decanting of a reservoir or a tank, maintaining precise level control in a reservoir or a tank and for controlling the flow into or from a conduit as a sluice gate. These gates have flat back frame design ensuring direct mounting on face of wall. These are also suitable in channel application where breast wall is not required. These also ensure continuous sealing on sides and bottom of gate aperture at any position of shutter opening.