Parr Instrument A296VB2 - Manual (Page 2)

Bottom Drain Valve Model A296VB2
P a r r I n s t r u m e n t C o m p a n y 2
Assembly of Bottom Drain Valve
1. Before assembly, all parts of the valve
should be clean and in good condition.
NOTE:
Assembly of the valve is easier if it
is removed from service and oriented so
that the threads going into the cylinder face
downwards.
2. Apply generous amounts of lubrication
using a high temperature thread lubricant.
See the “Lubrication of the Bottom Drain
Valve” section in this manual.
3. Install a 511VB3FH silver or 511VB3FG gold
faced (depending on BDV material) seal 1
into the cavity in the valve body. The plunger
may be used to help with the installation.
4. Install the compression ring, next install
the PTFE seal 2, and then install the second
compression ring.
5. Install the retainer and start the (3) 1/4-28
socket head cap screws.
6. Install the plunger assembly.
7. Tighten the retainer into valve body using
100 in-lbs torque on each of the (3) 1/4-28
socket head cap screws.
8. Install the (3) standoffs.
9. Install the (3) 1/4 flat socket head cap screws
with the plunger retracted away from seal 1.
10. Turn the handle clockwise until the plunger
contacts seal 1.
Lubrication of the Bottom Drain Valve
Lubrication of the straight threads should be
done with a nickel based high temperature
thread lubricant. If SD2520SC10 shoulder bolt
is removed, re-install into plunger with semi-
permanent thread locker. Lubricate all other
internal and outer straight threads on the valve
body, retainers, and plunger.
The frequency of lubrication depends on the
amount of use the valve receives. If the valve
sits for a long period of time (one or more
months), it should be lubricated before use. If
the valve is used daily, then lubrication may be
required once a week.
Applications that include operating tempera-
tures of 250 °C and above will require more
frequent lubrication of the valve threads.