User's Manual
Component Descriptions
September 2013 2-40 P/N 81-CO2MAN-001
Figure 2-44. Stackable Pressure Operated Control Head
2-3.8 Components for Pressure Operated Actuation Systems
2-3.8.1 NITROGEN PILOT CYLINDER AND BRACKET
Nitrogen pilot cylinders supply pressure to operate (via pressure operated control heads) CO
2
pilot cylinders, stop valves, N
2
discharge delays or N
2
pressure operated sirens. Three different
sized cylinder capacities are provided for use with CO
2
systems. Each cylinder is of steel
material and designed in accordance with USDOT and TC requirements. Each cylinder is factory
pressurized to 1800-psig @ 70F and fitted with a pressure gauge and pressure relief device.
Either pipe, tube or flexible hose connects each pilot cylinder to the pressure operated control
head(s).
2-3.8.1.1 Nitrogen Pilot Cylinder, 108 cu. in.
The 108 cu. in. N
2
Pilot Cylinder (P/N WK-877940-000) can be used to operate CO
2
pilot
cylinders, stop valves, a N
2
discharge delay or a N
2
pressure operated siren. Any compatible
control head can be fitted to the cylinder to provide the desired means of operation. The
cylinder valve has a 1/8-in NPT outlet. Any of the 1/8-in NPT x 5/16-in flare fittings can be used
to connect the valve to the corresponding actuation line. The cylinder is secured using the wall
mount bracket (P/N 81-87745-000).
2-3.8.1.2 Nitrogen Pilot Cylinder, 1040 cu. in.
The 1040 cu. in. N
2
Pilot Cylinder (P/N 90-101040-001) can be used to operate CO
2
pilot
cylinders, stop valves or multiple N
2
pressure operated sirens. Any compatible control head
can be fitted to the cylinder to provide the desired means of operation. The cylinder has a 5/8-
in Type "I" style valve affixed with a pressure gauge. In addition to the control head, this valve
requires attachment of a discharge head to allow discharge of the cylinder contents. The ½-in
NPT N
2
discharge hose (P/N 06-118207-00X) connects the discharge head to the
3-1/2 in.
(89 mm)
1-1/4 - 18 UNEF-3A
CAP RETAINER
1/8 in. - 27 NPT
PRESSURE INLET
PISTON
BODY
SET
OPERATED
STEM
1-1/4 - 18 UNEF-3B