User's Manual

Component Descriptions
P/N 81-CO2MAN-001 2-37 September 2013
2-3.6.5.2 Rubber Grommet
The rubber grommet, Part No. WK-207825-000, is used to support and seal a 
3/16-inch tubing penetration into a junction box.
2-3.6.6 3/16-INCH COPPER TUBING
In order to prevent damage, 3/16-inch heavy wall copper tubing (Figure 2-41) is used in
pneumatic actuated systems where the tubing is exposed. It is specifically used to connect
pneumatic control heads and pneumatic transmitters to junction boxes, and main-to-reserve
valves. The 17-inch (432 mm) length is used to interconnect tandem control heads; the 46-
inch (1168 mm) length is used only for interface between control heads and tubing for HADs.
The tubing is available for these applications in the lengths indicated in Table 2-15.
Figure 2-41. 3/16-inch Pneumatic Tubing
2-3.7 Pressure Operated Control Heads
Pressure operated control heads utilize the pressure from either a CO
2
or nitrogen cylinder to
actuate CO
2
cylinder valves or directional (stop) valves.
2-3.7.1 PRESSURE OPERATED CONTROL HEAD
This control head, Part No. 82-878737-000 (Figure 2-42), consists of a spring-loaded piston-
and-stem assembly housed in a brass body. The body has a threaded inlet port that connects
to the pressure line, and a swivel nut for connection to a control port. The supplied pressure
actuates the spring-loaded piston-and-stem assembly to engage the pilot check of the control
port to which it is connected.
Table 2-15. 3/16-inch Copper Tubing Part Numbers
Part Number Length
WK-802366-000 17 in. (432 mm)
81-802367-000 46 in. (1168 mm)
5-1/4 in.
(133 mm)
3/16 in. TUBING NUTS
3-1/4 in. DIA
(83 mm)
ALL LENGTHS HAVE TUBING
NUTS AND FLARED ENDS
P/N WK-802366-000
17 in. (432 mm) LENGTH
ILLUSTRATED