User's Manual

Component Descriptions
September 2013 2-42 P/N 81-CO2MAN-001
Figure 2-46. Fittings
2-4 CHECK VALVES
Check valves are required for fire suppression systems that are equipped with a main and
reserve set of carbon dioxide cylinders. They are installed in each discharge manifold to isolate
the main and reserve cylinders from each other.
Check valves are also employed in directional valve systems that use a common set of carbon
dioxide cylinders to protect areas or equipment of unequal sizes. The check valves divide the
cylinder group into subsets for discharge of the required amounts of carbon dioxide into the
protected areas or equipment.
2-4.1 Check Valves (1/4-inch through 3/8-inch)
The 1/4-inch and 3/8-inch check valves (Figure 2-47) are also used in Nitrogen or CO
2
pilot
lines; part numbers and dimensions are provided in Table 2-17.
Figure 2-47. Check Valves (1/4-inch and 3/8-inch)
MALE ELBOW
1/8 in. NPT x 5/16 in. TUBING
P/N WK-699205-030
MALE CONNECTOR
1/8 in. NPT x 5/16 in. TUBING
P/N WK-699205-010
MALE BRANCH TEE
1/8 in. NPT x 5/16 in. TUBING
P/N WK-699205-050
B
A
C
INST ALL VALVE WITH ARROW POINTING
IN DIRECTION OF FLOW
.