Description
The Keystone Figure 990/920 is a split body, thin disc resilient seated butterfly valve designed for high flow and modulating service. This valve excels in heavy duty applications where corrosion and abrasion resistance is required. It is available in both wafer (Figure 990) and lugged (Figure 920) style.
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 drop-tight 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.
Specifications
- Material: 316 Stainless Steel, Buna-N, Cast Iron, Ductile Iron, Duplex, Epdm Rubber, Hastelloy, Monel, Super Duplex, Teflon, Titanium
- Operating Temperature: Up to 250 F (120 C)
- Pressure Class: ASME
- Process Connection Type: 150RF
- Seat/Seal Type: Resilient
- Shutoff Class: Zero Leakage
- Standards: API 609, ASME B16.34
- Valve Type: Butterfly
- Valve Size: NPS 1-1/2 / DN 40, NPS 14 / DN 350, NPS 16 / DN 400, NPS 8 / DN 200, NPS 18 / DN 450, NPS 2 / DN 50, NPS 20 / DN 500, NPS 6 / DN 150, NPS 10 / DN 250, NPS 1 / DN 25, 5 inch, NPS 4 / DN 100, NPS 12 / DN 300, NPS 2-1/2 / DN 65, NPS 3 / DN 80
- Valve Size Standard: NPS
- Valve Type: Butterfly
- Media: Specialty Gases, Liquids, Air, Inert Gas, Water, Air
- Stem: O-ring
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