Is the gate valve
opening and closing parts, ram direction of motion perpendicular to
the direction of the fluid, the valve can only be fully open and fully
closed, can not be adjusted and cut expenditure. There are two gate
sealing surface, the most common mode of gate valve sealing surface to
form two wedge, wedge angle with the valve parameters vary, usually 50,
the medium temperature is not high when 425 ℃. Wedge gate valve can be
made into a whole, called rigid gate; also be made to produce small
deformation gate in order to improve its process, make up the sealing
surface angle deviations arising during processing, which gate is
called the flexible gate.

Valve types, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate valve,
wedge gate-type valve can be divided into: single-gate type, gate-type
double plate and elastic; parallel gate-type valve can be divided into
single-gate type and double plate. Position by the valve stem threads
are divided into clear shot valve and the dark bar gate two.

Valve closed, the sealing surface can only rely on media pressure to
seal, which only rely on media pressure to ram pressure to the other
side of the sealing surface of the seat to ensure the sealing surface
of the seal, which is self-sealing. Most of the valve is sealed by
force, that the valve is closed, to rely on external pressure to force
the gate to the seat in order to ensure the sealing surface of the
seal.

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