Reference Manual

10B −7
— T = 190_F
— P = 240 psig – 280 psig
— dP = 75 psi – 110 psi
— Q= 50-125 gpm
D Typical valve selection:
— NPS 2 to NPS 3 valves with alloy 6
scraper seats are utilized 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: TV-2 Flash steam to chip bin
temperature control
This valve controls the flow of low pressure steam
from the No. 2 flash tank to the steaming vessel
where the wood chips are pre-steamed at
atmospheric pressure.
D Typical process conditions:
— Fluid: Saturated steam
— T = 220_F
— P = 2.5 – 30 psid
— dP = 1.0 psi
— Q= 29000 – 50000 lbs/hr
D Typical valve selection:
— This is specified as a Fisher HPBV by
Kamyr. Valve size is in the range of NPS 10
to NPS 18. Metal bearings and a metal seat
are recommended by Kamyr. However,
PEEK bearings and Teflon seats in a
stainless steel body and with a 17-4 splined
shaft are also appropriate.
Valve: PV-5A Steam vessel pressure
relief
This valve is used for steam pressure relief in the
chip steaming vessel at the beginning of the
pulping process.
D Typical process conditions:
— Fluid: Steam
— T = 256 – 280_F
— P = 18 – 30 psig
— dP = 16 psi
D Typical valve selection:
— Kamyr specifies this valve as a NPS 8
one way, tight, spring assisted full bore ball
valve due to relief valve sizing downstream.
The V300 valve in stainless steel with alloy 6
trim would be a good alternative in this
application if the specification allows.
Valve: PV-5 Steaming vessel pressure
relief
This valve vents air and non-condensable gases
from the steaming vessel.
D Typical process conditions:
— Fluid: Steam and non-condensable gases
— T = 312_F
— P = 60 psig
— dP = 17 - 40 psid
— Q = 4300 lbs/hr
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: HV-5 Steaming vessel relief
steam flow
This valve sends “clean” steam from the steaming
vessel pressure relief to the steam condensers.
D Typical process conditions:
— Fluid: Steam
— T = 255_F
— P = 18 – 33 psig
— dP = 16 psi
— Q = 1200 lbs/hr
D Typical valve selection:
— This is a throttling application and Kamyr
has specified a V150 valve with attenuator
for this application. Stainless steel body
material together with a Nitronic 50 shaft, HD
metal seal, and PEEK bearings are
recommended. The valve is typically in the
NPS 6 size range.
Valve: PV-2 Steaming vessel pressure
control
This valve controls the steam pressure from the
No. 1 flash tank and fresh make-up low pressure
steam.
D Typical process conditions:
— Fluid: Low pressure saturated steam
— T = 320_F
— P = 80 psig