Parr Instrument A296VB2 - Manual

P a r r I n s t r u m e n t C o m p a n y w w w . p a r r i n s t . c o m
1” NPT Bottom Drain Valve Model A296VB2
Operating & Maintenance Instructions
687M
Description
The Parr Instrument Company A296VB2 Bottom
Drain Valve has an extended tip stem. In the
closed position, the stem of the valve is flush
with the inside bottom of the vessel so that
there is minimal dead space between the
bottom of the vessel and the shut off point
of the valve. In the fully open position, the
stem is retracted to open a clear passage from
the vessel. When the valve is re-closed, any
material in this passage will be pushed back
into the reactor by the rising stem.
Installation and Operation
This valve is designed to be installed in the
bottom of Parr cylinders that are machined
specifically for installation with minimal dead
space. Pipe thread sealant tape should be
applied to the valve body threads and then
installed turning clockwise into the cylinder. The
valve should be tightened sufficiently to seal
the pipe treads and bring the stem of the valve
approximately even with the inside bottom of
the cylinder.
The valve is opened by turning the handle
counterclockwise. Opening the valve will
progressively increase the passage for product
flow until the valve is at the fully open position.
The valve is closed by turning the handle
clockwise until the plunger contacts and
compresses seal 1.
Use the extension bar (661VBGA) provided with
the A296VB2 to open and close the valve.
CAUTION! If abrasive particles are
run through the valve, it is necessary
to flush the valve after use.
If the valve is leaking, it is a good indication
that the seal may be worn, has been damaged,
or abrasive particles are interfering. The valve
should be disassembled, inspected, cleaned as
required, and seals replaced.
Disassembly of the Bottom Drain Valve
1. Retract the plunger to the fully
open position by turning the handle
counterclockwise.
2. Remove the (3) 1/4-28 socket head cap
screws (SHCS) from the screw shaft retainer
using the 3/16 socket screw key furnished
with the BDV.
3. Loosen the (3) 1/4-28 socket head cap
screws that compress seal 2 with the
retainer using the 3/16 socket screw key
furnished with the BDV.
4. Pull the screw shaft retainer and plunger
assembly out of the valve body.
5. Remove the (3) standoffs.
6. Remove the (3) 1/4-28 socket head cap
screws and remove the retainer.
7. Using a pick, remove the compression rings
and seal 2.
8. Using a pick, remove seal 1 from the valve
body.