7
Orifi ce Adjustment
Orifices at each of the cylinder ports (double acting) or
flow control valve (single-acting) control the flow of gas
into the actuator, and therefore, the speed at which the
valve moves.
Initially, both orifices should be set at maximum value. If
more precise valve positioning is required for the applica-
tion, decrease the orifice settings, one or two numbers at
a time, and readjust the sensitivity. Because the valve will
be moving slower, a smaller dead
Table 3 -
Orifi ce Part Numbers
Figure 4 -
Variable orifi ce assembly (standard assembly shown)
Assembly
(Orifi ce included)
Orifi ce
Figure 5 -
For 2” & 3” valves an additional backpressure valve (metering valve) is used.
Orifi ce Size “Marking
Part #
Standard
(No Mark)
Assembly
25-1559
Orifi ce Only
25-1040
Medium “M”
Assembly
25-8162
Orifi ce Only
25-8075
Large “L”
Assembly
25-8163
Orifi ce Only
25-8076
