Butterfly Valve

TSC Offshore's wafer and lug type butterfly valves are designed to meet the stringent requirements of chemical processing plants, power plants, refineries, shipbuilding, pulp and paper mills, and wherever positive shut-off is required for water based solutions, oil, gas, and gas slurries. They are also the ideal choice for heating, ventilation and air conditioning applications.

Stems : Upper stems are flatted for positive drive and for easy installation of handles and actuators. Retained by tangential pins, upper and lower stems are blowout proof for safety when handles or actuators are removed from the valve top.

Flange seals : The TSC Butterfly Valve seat is constructed by bonding a resilient elastomer to a rigid back-up ring, which forms the outside periphery of the seat. Slip fitted in the valve body, the seat is field replaceable without special tools. In the closed position, the disc rim stem seal boss an uninterrupted line of sealing contact with the resilient seat, to assure drop tight sealing at rated shutoff pressure. TSC seats are offered in a wide range of materials.

Stem journal : Two self-lubricating bronze bearings reduce torsional friction, eliminate galling and seizing of the stem, while supporting the stem against side loading from pressure on the closed disc. TSC places one bearing at the base of the ribbed body.

Disc : TSC Butterfly Valve discs and seat are configured for low pressure drop and high flow coefficients. Full radius polished edges slide into drop tight seat engagement with little turning effort.

Seat : The TSC Butterfly Valve seat is constructed by bonding a resilient elastomer to a rigid back-up ring, which forms the outside periphery of the seat. Slip fitted in the valve body, the seat is field replaceable without special tools. In the closed position, the disc rim stem seal boss an uninterrupted line of sealing contact with the resilient seat, to assure drop tight sealing at rated shutoff pressure. TSC seats are offered in a wide range of materials.

Stem seals : The stem holes in the disc are surrounded by an annular raised boss which causes position seal every orientation of the disc. The resilient seat presses back with a higher specific force than the line pressure, preventing leakage the stem.

In competitive stem seal designs with boot seats, a seal is accomplished by an interference squeezing of the stem, or an o-ring in the stem journal. The potential for leakage behind the seat is high. As the disc wipes the seat, elongation of the stem seal area allows leakage to collect behind the seat. This condition is eliminated by TSC dry stem journal and hard-backed seat.

Disc Drive : Proper orientation of the stem/disc connection is assured by the rectangular drive. The disc is permitted to float on the stem to perfectly center in the valve seat.

Body : One piece bodies are ribbed to assure high strength and minimum weight. Bodies are cast in both wafer and tapped-lug patterns, in a wide variety of material choices, to meet virtually every installation requirement. Body rating is ANSI Class 150 (285 psi non-shock). Wafer body diameters are designed to self-center in ANSI 150 flange patterns.

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