Valve Calibration - Fisher Baumann 84000 Instruction Manual

Instruction Manual
June 2010
4. IMPORTANT: Verify that the recessed roller
bearings in the drive mechanism (key 4) rest against
the flats of the piston stem assembly (key 3).
5. Install the compressor (key 5) per figures 4, 5,
and 6 with the flat side resting against the extended
roller bearings.
6. Drop the wave springs (key 6) into place, prongs
down; the NPS 1 valve requires two wave springs.
The NPS 1 1/2 and 2 valves require three wave
springs. Oppose the spring opening 180 degrees
when installing the wave springs.
7. Retain all parts by installing the retaining ring
(key 7) into the bonnet groove.
8. The gap in the retaining ring (key 7) should align
with the crest of the wave spring (key 6).
9. Push down on the bonnet assembly to drive the
piston stem assembly (key 3) firmly into the drive
mechanism (key 4) to provide some tension.
10. Insert the O ring (key 15) (NPS 1 1/2 and 2
valves only), so that it rests on the retaining ring
(key 7).
11. Lubricate the screw thread and the cone of the
diaphragm (key 8) with sterile food grade lubricant.
12. Screw the diaphragm (key 8) onto the
compressor (key 5) snugly. DO NOT
OVERTIGHTEN.
13. Place the complete bonnet assembly onto the
valve body (key 1).
a. The diaphragm (key 8) rim must fit into the
body groove for proper centering.
b. The NPS 1 bolted flange configuration should
be tightened for metal to metal contact between
the flange and the valve body. Be sure to use 45
lbfSft when tightening the valve body bolts on the
NPS 1 valve.
c. For NPS 1 1/2 and 2 valves, apply the clamp
(key 11) and tighten the nut gradually, checking
for an even amount of PTFE over the valve body,
between the bonnet and clamp, for proper
centering.
d. The gap between the clamp ends should be
approximately 1/2 inch or less for proper
diaphragm compression. DO NOT
OVERTIGHTEN THE CLAMP.
e. Examine through port B to ensure the
diaphragm is centered on the seating area.

Valve Calibration

After the valve is assembled per the previous
instructions, install the properly configured actuator
(reference the Baumann Pneumatic Actuators
instruction manual, D103352X012), making sure to
engage the piston stem (key 3) as much as possible
into the actuator stem. Tighten the drive nut (key 9).
(Refer to figures 8 and 9 for the preferred flow
direction.)
Calibration of Fail Close (Air to Open)
Actuator
1. Apply 50 psi air or nitrogen to port B. Apply 3 psi
air signal to the actuator.
a. Slowly turn the piston stem assembly (key 3)
out of the actuator stem until flow stops.
When adjusting the valve stem, do not
grip the stem directly with pliers or a
wrench. This will damage the surface
of the stem. Instead, counter tighten
the two locknuts on the stem together.
This will allow you to turn the stem by
turning the locknuts with a wrench.
b. Check the valve for leaks with 50 psi air under
the diaphragm (port B). Leakage should be less
than 1 cc/min. The valve should start to leak or
low flow at a minimum pressure signal to the
actuator. If it takes more than minimum pressure
to open, then screw the piston stem assembly
(key 3) further into the actuator stem. If the valve
is not tight at 3 psi signal, screw the piston stem
assembly (key 3) out of the actuator stem further.
Next, calibrate Zero on the travel indicator scale
with a minimum pressure signal to the actuator.
Check for full travel at the maximum pressure
signal. If the leak persists, increase the force on
the clamp (key 11) to compress the diaphragm
(key 8) by tightening the clamp nut. For NPS 1
valves, tighten the bolts (key 18) on the bonnet
flange (key 11) using 45 lbfSft.
CAUTION
The stem should travel below zero by
approximately 1/16 to 1/8 inch after the
signal is decreased below 3 psi. IF THE
VALVE DOES NOT CLOSE PROPERLY,
INCREASE THE CLAMP
COMPRESSION AROUND THE
84000 Valve
Note
5