Reference Manual

10B −8
— dP = 42 psi
D Typical valve selection:
— In cases where entrained particles are
found in the flow, the recommended valve is
a CV500 with hardened trim due to the
potential erosion. If no particles are found in
the flow, a standard Vee-Ball may be used.
This is typically specified as a NPS 8 valve.
Valve: LV-6 Chip chute level control
This valve controls the liquor level in the chip
chute. The recommended value for this application
is a Vee-Ball, possibly with an attenuator. Carbon
steel body can be used, although stainless steel
would provide an added level of durability.
D Typical process conditions:
— Fluid: Black liquor
— T = 235_F
— P = 25 – 60 psig
— dP = 3 psi – 7 psi
— Q = 600 – 1700 gpm
D Typical valve selection:
— The Fisher CV500 will handle this
application with alloy 6 seal and in the
reverse flow orientation. This is a scaling
application which calls for the eccentric plug
action of the CV500. If the valve fails to
respond to changing levels in the chip chute,
there is a danger of liquor and chip spillage.
Valve: FV-3B White liquor pump to
bottom circulation
These valves are used to control the amount of
white liquor which is added to the wood chips.
They maintain the proper wood/liquor ratio. As
production increases, these valves open more to
maintain the proper ratio.
D Typical process conditions:
— Fluid: White liquor
— T = 190_F
— P = 260 psig – 290 psig
— dP = 60 psi – 90 psi
D Typical valve selection:
— These are NPS 2 to NPS 3 valves with
alloy 6 scraper seats due to concerns over
white liquor scaling. A SST V300 valve with
an alloy 6 HD seal and alloy 6 bearings
should be used in this application.
Valve: FV-3C White liquor to wash
circulation pump
D Typical process conditions:
— Fluid: White liquor
— T = 190_F
— P = 270 psig – 290 psig
— dP = 75 psi – 90 psi
D Typical valve selection:
— NPS 2 to NPS 3 valves with alloy 6
scraper seats due to concerns over white
liquor scaling are used. A SST V300 with an
alloy 6 HD seal and alloy 6 bearings should
be used in this application.
Valve: FV-3D White liquor to MC
circulation
These valves are used to control the amount of
white liquor which is added to the wood chips.
They maintain the proper wood/liquor ratio. As
production increases, these valves open more to
maintain the proper ratio.
D Typical process conditions:
— Fluid: White liquor
— T = 190_F
— P = 270 psig – 290 psig
— dP = 70 psi – 90 psi
— Q = 180 gpm
D Typical valve selection:
— NPS 2 to NPS 3 valves with alloy 6
scraper seats due to concerns over white
liquor scaling. A SST V300 valve with an
alloy 6 HD seal and alloy 6 bearings should
be used in this application.
Valve: FV-3E White liquor to wash
circulation
D Typical valve selection:
— NPS 2 to NPS 3 valves with alloy 6
scraper seats due to concerns over white
liquor scaling are utilized. A SST V300 with
an alloy 6 HD seal and alloy 6 bearings
should be used in this application.
Valve: FV-3F White liquor make-up to
impregnation vessel
These valves are used to control the amount of
white liquor, which is added to the wood chips.
They maintain the proper wood/liquor ratio. As
production increases, these valves open more to
maintain the proper ratio.