Gate 04
Gate 04 : A device in which a leaf or member is moved across the waterway from an external position to control or stop flow. (1) Bulkhead Gate: A gate used either to temporary close a channel or conduit in order to empty it for inspection or for closure against flowing water when the head difference is small, e.g., a diversion tunnel closure. Although a bulkhead gate is usually opened and closed under nearly balanced pressures, it nevertheless may be capable of withstanding a large pressure differential when in the closed position. (2) Crest Gate (Spillway Gate): A gate on the crest of a spillway to control overflow or reservoir water level. (3) Emergency Gate: A standby or reserve gate used only when the normal means of water control is not available. (4) Fixed Wheel Gate (Fixed Roller Gate, Fixed Axle Gate): A gate having wheels or rollers mounted on the end posts of the gate. The wheels bear against rails fixed in side grooves or gate guides. (5) Flap Gate: A gate hinged along one edge, usually either the top or bottom edge. Examples of bottom-hinged flap gates are tilting gates and fish belly gates, so-called due to their shape in cross section. (6) Flood Gate: A gate to control flood release from a reservoir. (7) Outlet Gate: A gate controlling the outflow of water from a reservoir. (8) Pneumatic Gate (Rubber Gate or Bladder Gate): A tubular flexible gate anchored to a foundation or inside a pipe that is operated by filling with air under pressure. Often used in conjuction with a Flap Gate as a Crest Gate or Flood Gate. (9) Radial Gate (Tainter Gate): A gate with a curved upstream plate and radial arms hinged to piers or other supporting structures on which the gate pivots. (10) Regulating Gate (Regulating Valve): A gate or valve that operates under full pressure and flow conditions to throttle and vary the rate of discharge. (11) Slide Gate (Sluice Gate): A gate that can be opened or closed by sliding it in supporting guides
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