For class VI shut off a triple eccentric disc design is required.
Triple Offset Butterfly Valves SLHBF-T
Superseal SLHBF-T 150 to 1500 class triple offset metal seat butterfly valves provide a bi-directional and bubble tight shutoff, which is attributed to the geometry of the triple offset seat. The valve stem is offset from the seat area (1st offset) and the valve seat surface centre line is offset against the centre line of the pipe (2nd offset) and the conical axis is offset from the valve centre line (3rd offset: inclined cone). The 3rd offset completely eliminates rubbing or scraping. The seat surfaces of the body and seal ring in this triple offset design, contact with an inclined “cone-in-cone”, and this design requires precision seating tolerances and durability to ensure a slight precision lapped wedge-mating effect. In addition, the angle of contact between the body and seat ring provides a low opening and closing torque due to almost no wedging and no scraping action on opening or closing (unlike trunnion mounted ball valves). This eccentric triple offset design provides excellent sealing performance and seat durability and it hardly ever needs repair under normal service conditions.
Characteristics and Merits
LINED BUTTERFLY VALVES
Model 2014, 2014HP, 2014HP2
Superseal 2014 series Butterfly valves are manufactured
in accordance with MSS SP 67, and API-609.
Both Lugged and Wafer style valves are designed for
ANSI 125/150lb class flanges as well as BS/AS table
D to H. DIN and JIS are also available, rated at
1400kPa (200 PSI) WOG service. Model variables are
also available in 1600kPa, 2000kPa, 2100kPa and 2400kPa.
Refer to our brochures on Model 2014HP and 2014 HP2 (in a limited size range).
Superseal Butterfly valves make an excellent choice by combining the balance of an economical valve with the performance you expect in a commercial, HVAC, industrial and petrochemical service butterfly valve.
Superseal Butterfly Valve Materials
Features
• 100% bi-directional factory tested valve product.
• Extended neck design for applications that require insulation.
• One-piece uni-body construction of cast iron designed to accommodate both ANSI, BS/AS
and DIN flanging. 2-piece body design also available for PTFE lined.
• Integral mounting flange will accept all styles of hand levers, manual gear operators and pneumatic or electric actuators.
• The cartridge seat design helps prevent the possibility of a blowout and ensures ease of
replacement. The ribs on the outside of the elastomer seat provide an interface seal with
flanges for no-gasket installation.
• Field replaceable seats are a standard design feature.
Material Options
• Body Materials: Ductile Iron, Cast Iron, and Stainless Steel.
• Disc Materials: Ductile Iron, Bronze, 316SS, Nylon Coated over Ductile Iron, PTFE over 316SS.
• Seat Materials: Buna-N, EPDM, Viton, and Teflon.
• Operators: 10 Position lever handle, Gear Operators, Pneumatic Rack & Pinion Actuators.
• Accessories: Galvanised Stem Extensions (Extended Bonnets), Chain Wheel Operators,
Square Operating Nuts and Cranks.
Superseal also manufactures a 2-Piece body (Model 20142P) for solid PTFE lined applications.
ANSI Valves Overview
Superseal Installation and Operations Manual
Superseal Sample Drawings