5
A. BIAS ADJUSTMENT:
With normal supply pressure and input (signal) pressures
applied, the Bias Adjusting Screw (Figure 2) may be turned
clockwise to increase the output (control) pressure or turned
counterclockwise to decrease output pressure.
B. RATIO ADJUSTMENT:
This is not a normal operating adjustment. However, when
necessary, the ratio of input to output pressure may be adjusted
by adjusting Valve Seat (17) as follows (see Figure 3 except
where noted):
1. With a supply pressure of 30 psig (2.1 bar) and an input
pressure of 3 psig (0.21 bar) on each input port, turn Bias
Adjusting Screw (Figure 2) until output pressure is 3 psig
(0.21 bar). Increase all input pressures to 15 psig (1.03
bar) and check output pressure, which should be 15
±
0.2
psig (1.03
±
0.01 bar).
2. If necessary, remove Cap (24) and adjust Valve Seat (17)
until the correct output pressure is obtained.
3. Repeat steps 1 and 2 until the correct ratio is obtained.
This unit may be adjusted while operating with Cap (24)
removed, but the final setting must be checked after the
Cap (24) has been replaced.
Figure 2
The simplified design of this relay makes routine
maintenance unnecessary. However, should the air or air
lines be dirty, it may be necessary to clean the surfaces of the
Valve (18) and the Valve Seats (A) and (B). If continued
difficulty is experienced from dirt, moisture, oil, etc., suitable
filters should be provided in the supply lines.
If the control pressure does not go to minimum output
pressure or zero, or if the exhaust appears to be leaking,
follow the instructions below (refer to Figure 3 except as
noted):
1. Remove the Cap (24) and Spring Retainer (20) by
unscrewing from the Cover (22). Note position of
Spring Retainer (20) before removing so that it can be
replaced in approximately the same position. The Valve
(18), Valve Spring (19) and Gasket (23) are now free to
fall out. Be careful not to drop the parts.
2. Using a CLEAN, soft brush, cloth or paper, wipe off the
Valve Seats (A) and (B).
3. Inspect
both
Hemispherical Surfaces (C) of the Valve
(18) for dirt, chips, etc. If any scars or imperfections are
apparent, the Valve (18) should be replaced.
4. Replace the Valve (18), Valve Spring (19), Spring
Retainer (20), Gasket (23) and Cap (24). Be sure that the
Spring Retainer (20) is in the same position as it was in
before disassembly, approximately one turn below being
flush with end of Adjustable Seat (17) and that the Cap
(24) is tight. Check Cap (24) for external leakage.
5. Adjust per Section IV if needed.
DO NOT USE ANY GASKET SHELLAC, PIPE
COMPOUND, OR OTHER SEALANT.
SECTION IV - ADJUSTMENTS
SECTION V - MAINTENANCE
Содержание CR-103-A Series
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