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Special
Feature:
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Seat
sealing:
At the high line pressure,the sealing force pushes the seat against
ball to create a tight seal.
At
the low line pressure,the tight seal is provided by spring force
against ball. |
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Seating force=line pressure(p1)¡Á(A1-A2)
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| Low
Fricition Bearing:
The self lubricated PTFE coated bearings in the
stem,gland and trunnion area maintain the valve for low
operating torque and provide a long service life. |
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Top
Entry Construction:
Top Entry Trunnion Ball Valve offers inline service of the
stem ball,seats and springs. Removal of the gland provides
easy access for- maintenance and service. |
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¡¡
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Fire-safe
Feature: |
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| Should
the soft seats be destroyed by fire,the fluid/seat springs
pressure push the metal seating to the ball,thus providing
a secondary tight metal seal as a fire safe mechanism. |
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Fire-Safe
gasket is provided to back-up the primary O-rings seals. |
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Security
Feature |
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Optional Locking Device:
DHV lever and operated ball valves are available with an optional
locking device in either the full open or closed position to protect
against unauthorized operation. |
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| Cavity
Relief:
When cavity pressure increases within the ball
valve body,automatic pressure relief will occur by relieving
the body cavity pressure past the downstream seat. |
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Anti
Static Device
The springs between the ball and stem provide anti-static
continuity through-out all valve parts. |
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Sealant
injection Fitting:
DHV valve is supplied with a standard stem sealant injection fitting.Seat
sealant fittings backup by a internal check valve are also standard
on DHV valve are also standard on DHV valve 6" and larger.In
the event a seat should be damaged,the sealant could be injected
through seat injection fitting to provide an emergency shutoff. |
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