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Operator Design
Corrosion resistant lightweight, lockable levers with 7 intermediate stops are standard. Mounting accommodates ISO Standard gear operators and actuators.
Corrosion resistant stem extensions for buried service made to customer
requirements
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Full Flange Face Body
Full flange face body for reduced flange cost. AVT Valves do not require the use of heavy duty flanges when used with GRE pipe systems. They can be fitted as direct replacements for all metal valves of the same specification.
Also available in tapped lugged
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Disc / Seat Design
This disc design takes advantage of the inherent strength of the resin systems to limit the overall thickness of the disc, thereby reducing the restriction of flow to a practical minimum when the valve is fully opened.
The seat is secured to the disc by a moulded retaining plate. Leakage behind the seat is prevented by a secondary seal moulded on the inside diameter of the seat.
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First Degree Off Set
The off set between the seat face and the shaft axis makes the 360˚ seat possible ensuring bubble tight sealing even in high cycling applications.
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Shafts
Shafts
Sealed with a multi "O" ring system that ensures long life bubble tight even in high cycling applications without the need for maintenance. Hastelloy non wetted shaft as standard, with 316 and Titanium optional.
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Second Degree Off Set
The off-set of the shaft with respect to the axis of the bore combined with the first degree of off-set ensures that the sector of the seat sealing surface that passes through the sealing face is effectively cleared from contact by a very small angular motion.
The introduction of this second degree of off set reduces wear and break out torque.
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One Piece Shaft Assembly
One piece shaft assembly and unique shaft/disc connection eliminates flutter for improved flow and noise
reduction.
Shaft designed as non-wetted, blow out proof. Every valve bodytested to 600 psi
(40 bar).
