Keystone Figure 990 and 920 Resilient Seated butterfy

GENERAL APPLICATION

Figure 990 and 920 valves are used when modulating service or corrosion resistance is required. Heavy duty applications include food and beverage, pharmaceutical, pulp and paper, mining, oil and gas and power industries. Available with PTFE lining for light corrosive services and rubber lining for light abrasive services.

FEATURES

• One-piece, thin profile, disc stem provides minimum obstruction to flow, resulting in highest Cv, lowest pressure drops and best control characteristics.

• Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and tight shut-off. • Triple function, resilient seat isolates body and stem from line media, provides droptight shut-off of line media at full-rated pressure and provides positive flange sealing, eliminating the need for flange gaskets.

• Heavy duty, corrosion resistant top bushing provides upper stem support, absorbs actuator sideloading and extends valve cycle life.

• Bi-directional, self-adjusting double V-cup stem seals prevent external contaminants from entering the valve.

• Split body design enables easy field replacement of seat and disc/stem and permits direct mounting of Keystone actuators without the use of couplings or brackets.

TECHNICAL DATA

Sizes:

DN 25-500 (NPS 1-20) Wafer style DN 50-500 (NPS 2-20) Lugged style

Pressure ratings:

10 bar DN 25-300 (150 psi NPS 1-12) 5 bar DN 350-500 (75 psi NPS 14-20) PTFE or elastomer mold disc 7 bar DN 50-300 (100 psi NPS 2-12) 5 bar DN 350-500 (75 psi NPS 14-20)

Flange accommodation:

ASME 125/150 AS 2129 Table E PN 10/16 BST'E

Data Sheets: Figure 990 and 920 Resilient Seated Butterfly Valves