Other Keystone Equipment

Keystone 990 & 920 Butterfly Valves


The Keystone 990 (wafer) and Keystone 920 (lug) are thin disc resilient seated Butterfly Valves. The Keystone 990 and 920 are used when sanitary service and corrosion resistance is required.


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One-piece, thin profile, 316 Stainless steel disc/stem provides minimum obstruction to flow, resulting in highest Cv, lowest pressure drops and best control characteristics
Also available with PTFE, NBR or EPDM molded disc
Triple function, resilient dovetail seat isolates body and stem from line media, provides drop-tight shut-off of line media at full-rated pressure and permits convenient and economical replacement in the field
Heavy duty, corrosion resistant top bushing provides upper stem support, absorbs Actuator side loading 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.
Sizes: 1 – 20 inch (Figure 990) Wafer,
2 – 20 inch (Figure 920) Lug
Pressure ratings: 150 psi (1 – 12 inch)
316 Stainless steel disc/stem
75 psi (14 – 20 inch)
100 psi (2 – 12 inch) 
PTFE or rubber-molded disc
Flange standard:
Figure 990 is a resilient-seated, wafer-style,
Butterfly Valve suitable for installation between
ANSI Class 125/150 flanges
 
Figure 920 provides drilled and
tapped lugs around the Valve body,
compatible with ANSI Class 125/150 flange standards.