Butterfly Valve Figure 990
General application
The figure 990-102/003 is the ideal valve
for use in the food and beverage industries.
The figure 990-007 is teflon lined for use in
semi-aggressive chemical industries. Max
pressure 7 bar.
The figure 990-002 is rubber lined for use
in the process industries. Max pressure 7
bar.
Warning !
Not for use on unstable gasses.
Not for end of line use.

Technical data
Pressure (bar) : 10
Temperature (¡ãC) : -10 to +150
Sizes (mm) : 25-300
Flange
accommodation : PN 10/16
ANSI 150
BST¡¯E¡¯

Features
• Factory testing of every valve at full rating
ensures 100% bubble-tight shut-off.
• Standardised actuator flange for easy
operator interchangeability and mount
direct to Keystone Range of actuators.
• One-piece wafer-thin disc-stem provides
high strength and absolutely positive disc
control and gives the very minimum
obstruction to flow. Its crevice free surface
makes it ideal for hygienic duty.
• Primary seal formed by the seat/shaft/hub
contact exceeds the pressure rating of the
valve. Body is totally isolated from the
flowing medium.
• Secondary shaft seal is suitable for
pressure and vacuum is self adjusting.
• Patented dove-tail seat requires no
bonding. Makes seat replacement simple
and fast. Extra heavy edge section resists
tearing.
• Hub seal is provided by preloaded contact
between flatted seat surface and rounded
polished disc-hub area for positive sealing
at all disc positions.
• Moulded-in O-ring provides positive flange
sealing and eliminates the need for
gaskets.
• Heavy duty top bushing absorbs side
thrust loads. Self-adjusting sealing for both
directions is also suitable for vacuum.

TD = FT x ¦¤P
TD = Dynamic torque (Nm)
¦¤P = Pressure drop across disc air
desired disc-opening (bar)
FT = Dynamic torque factor
(see table)
2. The dynamic torque includes all frictional
resistances.
3. The dynamic torque is tending to close the
disc.
4. The charted maximum allowable torques
are only applicable for standard type