With a GATE VALVE, flow control is achieved by sliding a suitably shaped gate into the path of the fluid.
Gate valves are designed for use in straight-through and otherwise unobstructed passageways where the requirement is for simple full-on, full-off flow control. When fully open, flow through the valve is unimpeded, resulting in minimal turbulence and pressure drop.
There are options in the design and construction of gate valve seats and wedges to accommodate different thermal environments or frequent maintenance requirements.