Kidde Fire Protection 400 Series, Design, Installation, Operation, And Maintenance Manual

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Component Descriptions
July 2018 2-8 06-237518-001
2-3.6 Pilot Line Non-Return Valve
Use the pilot line non-return valve (P/N 38-400002-003) in the pilot lines of systems protecting
multiple hazards to isolate sections of the cylinders. Activating cylinders downstream of the
pilot line non-return valve will not activate cylinders upstream, preventing excess agent from
being discharged into a hazard.
Figure 2-9. Pilot Line Non-Return Check Valve
Figure 2-10. Pilot Line Non-Return Check Valve Direction of Flow
Figure 2-11. Typical Pilot Line on Selector Valve System (Rear View)
Table 2-6. Components for Typical Pilot Line
Item Description
1 Hazard 1 Release Unit
2 Hazard 2 Release Unit
3 Pilot Line Non-Return Valve
4 Pilot Line Bleed Valve
From Release Unit on Cylinder
To Cylinder valve
From Previous Cylinder
Valve Upstream
To Distribution
Pipe Work