©Copyright Task Force Tips LLC 2021
14
LIX-575 June 24, 2021 Rev00
7.0 EXTEND-A-GUN VP INSTALLATION OVERVIEW
Section 7.0 is an overview for planning the equipment layout, followed by detailed assembly instructions in Section 8.0. This device is
received in 3 subassemblies: the telescoping waterway, the waterway valve, and the pneumatic cylinder. These subassemblies allow
assembly through the deck of the truck and selection of the appropriate orientations for the valve inlet and driveshaft. The telescoping
waterway must be oriented vertically with the outlet facing upwards.
Figure 7.0
7.1 POSITION INDICATING HANDWHEEL (NOT INCLUDED)
The waterway valve in this device will be hidden within the vehicle, and thus
requires a position indicating handwheel to show the valve position from the
pump panel. The position indicating handwheel must be 9 turns from closed to
open, with a counterclockwise opening direction per NFPA 1901.
A 4” handwheel is recommended due to the low operating torque of this valve
design. The driveshaft for the valve handwheel is intended to be extended with
½” rod and universal joints that are compatible with the driveshaft geometry, see
Figure 7.1. Trident Emergency Products item 19.409 is a suitable handwheel
that includes 2 universal joints.
7.2 DECK MONITOR UP/DOWN TOGGLE SWITCH (NOT INCLUDED)
The telescoping waterway is intended to be driven by a single pole, single throw switch chosen by the installer, which will toggle the input
of an electrical relay. This toggle switch will only function when the valve is closed and should be mounted adjacent to the valve
handwheel.
7.3 PNEUMATIC REQUIREMENTS
The telescoping waterway of this device is driven up and down by a pneumatic cylinder. It is intended to be installed on vehicles that
include an air compressor to supply the air brake system. To protect the air brake system as well as this device, the system must include
the following:
1. An air compressor governor switch calibrated to a maximum of 130 psi
2. A safety relief valve calibrated to a maximum of 150 psi
In addition, the system must include the following per NFPA 1901, 2016 edition:
3. A pressure protection valve (PPV) calibrated to a minimum of 80 psi, installed between the air supply tank and the pneumatic
directional control valve of the Extend-A-Gun VP
4. An air dryer installed between the compressor and wet air tank
5. An automatic moisture ejector connected to the bottom of the wet air tank
NOTICE
This device includes a smaller air pressure relief valve, with a capacity of 130 scfm. This relief valve
cannot relieve overall system pressure and does not take the place of the mandatory air pressure
regulator and safety relief valve that are required by the air brake system. This relief valve is only
intended to relieve unintended overloads exceeding 150 psi in the extend circuit of the air cylinder
itself.
TELESCOPING WATERWAY
PNEUMATIC CYLINDER
WATERWAY VALVE
.50"
.25"
.50"
1.05"
Figure 7.1
