Product introduction：
The
inflatable dome valve is a switchgear for gas conveyed materials
and plays a role of opening and separating pipeline space. It is
applicable to sealed conveying system for loose, dry, nonviscous
and mobile solid materials, especially for ash and slag disposal
system in thermal power plant. The closing and opening of the dome
valve are realized via a ball valve and an inflatable rubber seal
ring, and executed in a state of no pressure so as to fulfill contactless
displacement of the ball valve and inflatable rubber seal ring.
In
accordance with different applications, the core of the dome valve
is made of different materials, and different hardening treatments
are performed for surface. The glossy and hard surface of valve
core can guarantee the reliability of well and closed contact with
the rubber seal ring. The rubber seal ring is made of special rubber
characterized by high-temperature resistance, corrosion resistance,
wear resistance and aging resistance as well as long service life.
Upon opening of the valve, the feed inlet opens to full extent without
obstruction. The valve is suitable for media such as gas, liquid,
semi-fluid and solid powder.
Work principle：
The
dome valve core is a spherical dome, which during opening and closing
of the dome valve keeps a clearance of approximate 0.5~1.2mm with
the rubber seal ring, enabling them to move without contact with
a purpose of preventing friction between the valve core and the
rubber seal ring and reducing wear. The pneumatic actuator of the
dome valve is a 90°rotary oscillating cylinder, which drives the
valve core to rotate via a revolving shaft. The operating process
of the dome valve core: the seal ring is inflated after rotation
of the valve core stops, then the air is discharged from the seal
ring before rotation of the valve core begins, the seal ring is
not inflated, thus a cycle is completed.
Normal
state: when the valve core is in closing position, the adjusting
bolt on rotor arm presses on mandrel of a two-position three-way
motorized slide valve, the air source supplies air for the seal
ring, and the pressure on the seal ring is displayed on manometer.
Opening state: before action the 90°rotary oscillating cylinder
discharges air inside the seal ring from the air vent of two-position
three-way motorized slide valve via time delayer, at the moment
the valve core starts rotating, during which the valve core does
not contact the seal ring.
Closing
state: upon the closing instruction, the cylinder begins reverse
action. As the valve core rotates to closing state, the adjusting
bolt on rotor arm presses on mandrel of the two-position three-way
motorized slide valve, and then the air source supplies air for
the seal ring from the air inlet of the two-position three-way motorized
slide valve via time delayer. (the time between closing in place
and air inflation is accomplished via adjusting bolt.
Main technical parameters：
公Nominal
pressure: 1.0MPa, medium temperature: ≤180℃, strength test: 1.5MPa
sealing test, 1.1MPa pneumatic actuator: 90°rotary oscillating cylinder,
output torque of DN125 actuator: 300N?m/0.5MPa, the working pressure
on cylinder is 0.4MPa~0.6MPa, the inflation pressure of the seal
ring is 0.4MPa~0.6MPa and higher than conveying pressure 0.15MPa,
and clean, dry and oilless compressed air is used.
Installation,Operationing instructions：
1.Before
installation this instruction should be carefully read, and type,
full bore and technical parameters of the valve be checked.
2.Before
discharge of compressed air opening valve is forbidden! Water and
wet materials are forbidden into valve!
3.After
installation of valve welding flange is forbidden to prevent from
damaging the seal ring of valve. The installation distance for valve
reserved in pipelines shall be appropriate, and gaskets shall be
added on both sides of flange.
4.The
centers of two pipelines shall be remained coaxial with the center
of valve full bore, and two sides of flange shall be smooth so as
to guarantee clamping and normal operation of valve.
5.The
working conditions of dome valve shall be inspected at regular time,
and abnormalities, if any, should be handled correctly in time.
6.Lifting,
installation, operation, test and repair should conform to safety
regulations for operation.
7.Before
delivery the valve has been adjusted and dynamically tested, and
the air pipe has been connected. |
