Zwick Armaturen GmbH

SPECIAL FEATURES

THE SELF-CENTERING DISC

The construction guarantees the optimal position of the laminated seal against the seat. Jamming due to thermal expansion is eliminated.

TORQUE TRANSMISSION USING KEYS

The disc is keyed to the shaft not pinned, providing balanced torque transmission and eliminating the danger of pins shearing off.

IDEAL LAMINATION AND DISC DESIGN

The strong disc with its eliptical supporting surface offers the best fixing of the lamination. Bubble tightness is given as a result of the special machining of the lamination.

SUPPORTING BEARING BUSHINGS

The optimal position of the bearing reduces the risk of the shaft bending. This guarantees bi-directional tightness at maximum differental pressure.

GENERAL CHARACTERISTICS

• Triple eccentric design

• Metal seating

• Pressure classes according ANSI 150/300/600/900 and PN 10/16/25/40/63/100/160

• Full bi-directional shutoff as per API 598 and/or DIN EN 12266-1

• Temperature range up to 815°C

• Size range 2″ – 88″ (DN 50-2200)

• Friction free opening and closing

• Vacuum tight

• Laminated seal and seat made of stainless steel

• Anti blow-out shaft API 609

• Steel casting, stainless steel, special alloys

• Fire-safe acc. to BS 6755 and API 607 4th ed. for both flow directions

• Fugitive emission control acc. to “TA-Luft II”

• Optional Double Block & Bleed Design

• Special customer requirements on request

• SIL 3

• EPA 21