タイトルまたは説明
Features of Structure and Working Principle
1) Block-up
And Excretion
When the valve is in the closed state, the seat ring on the
upstream and downstream sides cuts off the fluid and the
accumulated matters in the middle cavity of the body can be
excreted, The excreting device features the following functions:
Can check if the seat ring leaks or gets damaged beforehand;
Reduce pollution to the valve due to the medium replacement; The
packing on the stem portion can be replaced when the valve is in
the fully opened or closed state under the working pressure.
2) Automatic
Pressure Discharge
When an abnormal pressure rise occurs with the medium stayed in
the middle cavity of the valve due to rising temperature, the
seat ring will come off from the ball and automatically discharge
pressure or the safety valve mounted on the body ensures the
system safety.
3) Complete
Seal
The unique sealing mode of the ball valve makes the fluid
completely cut off.
4) Fire-fighting
Structure
If the Teflon seat ring is made softened and burnt in case of a
fire or an abnormal temperature rise, the valve can be contacted
with the ball to act as an instantaneous seal, conforming with
AP***7.
5) Electrostatic-proof
Structure
During valve operation, the friction between the ball and the
PTFE seat ring will produce electrostatic charges and they will
be accumulated onto the ball. To prevent electrostatic spark from
being produced, an electrostatic-proof device is mounted on the
valve, which can guide the charges out through the electric path
formed by both ball and via the spring.
6) Emergent
Rescue Of Sral
When the sealing parts of both seat ring and stem get damaged and
thus leaks are caused, an instantaneous sealing action can be
made available by injecting sealing grease through the grease
injecting valve.
7) Structure
Of Seat Ring
Two kinds:single-seal and dual-seal. In general, those of an
automatic pressure discharge function are single-seal while the
dual-seal means the additional safety pressure diacharge to the
body.
8) Full
Or Reduced Diameter
The valve nominal diameter is identical to the inner diameter of
the pipeline(which can be reduced one if so required by users)
for the sake of cleaning.
9) Locker
Use a locker to fix the valve so as to prevent maloperation of it
and keep it in the correct opened or closed position.
*0) Extension
Of Stem
Extension of the stem is suitable for use under-ground and at low
temperature, the extended size is depended on the necessity and
the operation mode can be manual, pneumatic, electric,
gas-hydraulic jointed or hydraulic actuation, also upon the
necessity.
*1) Reliability
Of Operation
The relative sliding portion(seat ring and stem bearing) of a
large aperture ball valve has a small operational torque due to
its use of Teflon which has a small friction coefficient and can
be flexibly operated for a long time even if there is no
lubrication supplied for it.
*2) Different
Actuation Modes
The used, different and effective actuation modes include manual,
qneumatic, electric, hydraulic and gas-hydraulic jointed ones.
| 国: |
China |
| モデル番号: |
Q347F(H)
|
| 离岸价格: |
（交渉可能）
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