Wilkerson P19 - Manual (Page 2)

Operation
1. Before turning on the air supply, turn the adjusting knob
counterclockwise until compression is released from the control
spring. Then turn on air supply and adjust regulator to desired
secondary pressure by turning adjusting knob clockwise. This
permits pressure to build up slowly, preventing any unexpected
operation of the valve, cylinders, tools, etc., attached to the line.
Adjustment to desired secondary pressure can be made only
with primary pressure applied to the regulator.
2. To decrease regulator pressure setting, always reset from a
pressure lower than the final setting desired. For example,
lowering the secondary pressure from 5.5 to 4.1 bar (80 to 60
PSIG) is best accomplished by dropping the secondary pressure
to 3.5 bar (50 PSIG), then adjusting upward to 4.1 bar
(60 PSIG).
Figure 1
CAUTION
REGULATOR PRESSURE ADJUSTMENT - The working range
of the knob adjustment is designed to permit outlet pressures
within their full range. Pressure adjustment beyond this
range is also possible because the knob is not a limiting
device. This is a common characteristic of most industrial
regulators, and limiting devices may be obtained only by
special design.
Service: (Always vent all air pressure
before servicing)
1. Turn the control knob (A) fully counterclockwise. Remove
upstream air supply.
2. Remove two # 10-32 screws (R) on the bottom of the regulator
body (K) releasing the seal (P) and cap (Q). Pull out the inner
valve assembly (N) and screen (M). Discard inner valve
assembly and clean screen with mild soap and water.
3. Remove six screws (B) holding the bonnet (C) in place. Remove
bonnet, spring cap (D), spring (E) and diaphragm assembly
(F). Discard diaphragm assembly.
4. Remove the seal plate and jet tube assembly (G) and carefully
lift out the assembly taking precautions not to bend the jet
tube. Remove o-ring (H) and inner valve guide (J).
5. Clean all retained parts with mild soap and water.
6. Assemble the o-ring (H) and inner valve guide (J).
7. Place the new diaphragm assembly (F) over the valve stem
and pilot bushing. Align the screw holes in the diaphragm with
those In the regulator body (K). Place the main spring (E) and
spring cap (D) into position on top of the diaphragm assembly.
High Flow Precision Regulator IS2R206
C
A
B
D
E
F*
G
K
H*
J
L
M
N*
P
Q
R
}
* Parts in Kit
!
IN OUT
Figure 2
8. Insert the new inner valve assembly (N) making sure the screen
(M) is centrally located in the groove on the top side of the
valve body. Replace the seal (P) and cap (Q), and securely
tighten using the two #10-32 screws (R) torque 3.2 to 3.6 Nm
(28 to 32 in-lbs).
9. Place the bonnet (C) into position over the spring cap (D) and
reassemble the (6) screws (B). Tighten screws 3.2 to 3.6 Nm
(28 to 32 in-lbs) in progressive steps using a crisscross pattern.
10. Admit inlet pressure and turn the adjusting knob (A) to obtain
the desired pressure.
NOTE: A slight flow of air through the bonnet vent hole is necessary
for proper operation of the regulator.