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Trunnion Mounted Ball Valve
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| Content |
Specification |
| General design standard
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API6D |
| Pressure-temperature
rating |
ASME B16.34 |
| Face to face dimensions |
ASME B16.10 |
| Flange type and dimensions
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ASME B16.5 |
| Butt-welded end |
ASME B16.25 |
| Inspection and test
|
API598 |
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| Trunnion Mounted Ball Valve Construction Features Function: |
1.Up
stream Sealing Two-way Valve
The up stream seal of the Valve is fulfilled by the
advanced spring pre-tighting seat package which has
a feature of self-tightness. The two-way valve has
two seats that can be sealed on two directions, so
there' s no limitation of flow direction during installation. |
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2.Double
Block &Bleed Valve
Being up stream side sealing , the valve can bleed
out the trapped fluid in the body cavity when the
valves is in fully open or fully close position. the
fluid is intercepted by seats of up stream and down
stream side. So, the stem packing or O-ring may be
replaced under working ressure. And to bleed the dirty
fluid eriodically can reduce damage of the sealing
surface and prolong the service life of the valve.
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3.Automatic
Relief of the Cavity:
If the pressure of the body cavity unusually goes
up, ZGFQ valve can automatically relieve the pressure
by compressing the spring in the spring pre-tighting
seat package. |
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4.Full
Bore or Reduce Bore:
Either full bore or reduce bore can be available according
to ustomers' requirements. For full bore type, the
diameter of the valve ball bore is as same as the
pipe size, which facilitates pigging operation. |
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5.Fireproof
Design:
When the non-metal seat are softened and burnt in
case of the fire or unusual temperature increase,
the seat retainer, under the duty of the spring, will
touch with the ball and form a metal -to-metal contact,
which can prevent internal leak: meanwhile, the middle
flange and the upper part and lower part of the stem
will form a metal-to-metal
contact which can prevent external leak and conform
to API6FA or API607. |
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6.Assistant
Grease Injection Valve
When seat and stem sealing system is damaged, the
grease injection valve can inject sealing grease into
the valve for temporary sealing.
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7.Stem
Sealing System
Two O-rings are adopted in/out the stem position with
reliable performance. |
8.Stem
Extension
According to installation or operation need, the valve
stem may be extended. This design is suitable for
under ground application. The stem extension length
can be confirmed by customer. |
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9.Flexible
Operation.
The seat and stem bearing adopt Teflon with small
friction and self-lubrication to reduce the valve
operation torque. The valve can be easily operated
for long period even with no sealing lubrication grease. |
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10.Multi-Operation
Type.
The valve may be operated by hand, pneumatic operator,
motor, hydro-pneumatic operator and hydraulic operator,
etc. |
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