Manual
flapper valve has the advantages of simple and compact structure,
reasonable design, reliable sealing, light and flexible operation, small
volume, smooth passage, small resistance, easy installation and easy
dismantling etc. The manual spiral gate valve can be installed
horizontally or vertically, And automatic compensation function long
life and so on.
Manual flapper valve is often used with the unloading device or
silo, manual screw gate valve flange connection is easy to install, the
inlet and outlet are square and round two, according to the size of the
caliber of dozens of specifications, widely used Metallurgy, carbon,
chemicals, building materials and other industries. Manual flapper valve
in the normal use of the transmission parts should be regularly
checked, add lubricant to do maintenance.
Electric flapper valve flapper valve opening and closing pieces is
the gate, the direction of the movement of the gate and the direction of
the fluid perpendicular to the flapper valve can only be fully open and
fully closed, can not be adjusted and throttling. Gate has two sealing
surfaces, the most common mode of the two gate valve sealing surface to
form a wedge, wedge angle varies with the valve parameters, usually 50,
wedge-type valve plate can be made into a whole, called Rigid gate; can
also be made to produce a trace of deformation of the gate to improve
its technology to make up the sealing surface angle deviation in the
processing process, this gate is called the elastic gate flapper valve
is closed, the sealing surface You can only rely on media pressure to
seal, that is, relying on the media pressure to the gate of the sealing
surface to the other side of the valve seat to ensure the sealing
surface of the seal, which is self-sealing. Most of the flapper valve is
forced seal, that is, the valve is closed, to rely on external force to
force the gate pressure to the seat in order to ensure the sealing
surface of the seal. Flap valve sealing structure can be soft-sealed,
hard seal structure.
