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gate valve[′gāt ‚valv]
A valve with a disk-shaped closing element that fits tightly over an opening through which water passes.
gate valve, full-way valve
A flow control device consisting of a wedge-shaped gate which can be raised to allow full, unobstructed flow or can be lowered to restrict the flow passage; not intended for close fluid flow control nor for very tight shutoff. (See illustration p. 456.)