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2.2 Functional description and allowable operation
The sintgle shut-off underground fire hydrant is composed of:
• A vertical tubing (7) having in the lower part a horizontal
inlet flange (1) to connect to the water network, and in the
upper part an outlet claw 75 (R. 11).
• A shut-off valve made with of a cone (4) encapsulated in
elastomer, and closing on the coated seat (2) at the bottom
part of the body. This cone (4) is linked to the operating
stem (9) in the upper part by a tube (6) having a nut (8). The
operating system is operated through a square cap (10) .
• A double automatic drainage device located on both side
of the bottom part, above the seating area of the cone (3).
The rotary motion, in the anti-clockwise direction, on the
square cap (10), in the upper part of the hydrant, moves the
shut-off cone (4) in a downward direction in order to release
the passage around the seat. Upon opening, the water passes
around the shut-off cone in the cone chamber (5) and rises
through the vertical tubing (7) to emerge at the outlet claw
(11). During the downward movement of the shut-off cone (4),
its two guiding lugs close the two drainage orifices (3).
The rotary motion in the clockwise direction on the square
cap (10) , in the upper part of the hydrant, moves the shut-off
cone (4) in an upward direction in order to close the passage.
Upon closing, the flow stops. At the end of the upward
movement of the shut-off cone (4), its two guiding lugs open
the two drainage orifices (2) in order to empty the hydrant.
In the case of the double shut-off underground fire hydrant,
there is a floating ball (12) located in the cone chamber (5).
This floating ball follows the movement of the shut-off cone,
and allows secure closing.
Closing/Opening direction are indicated on the products.
Operation of our fire underground hydrants must be
performed with the appropriate operating Key « C » according
to DIN 3223, for square cap 32. The appropriate operating
Key « C » should only be used for the recommended torque
values according to Table 4, otherwise the hydrant might be
damaged.
Figure 1: Hydrant closed
Single shut-off version (UHA)
Figure 3: Hydrant open
The technical data and performance may be modified
without prior notice depending on the technical advances.
10
3
5
1
Double shut-off (UHAD)
Figure 2: Hydrant closed
Double shut-off version (UHAD)
IOM_FIH210201_HALIOS STD-PREM_EN
11
9
8
7
6
4
2
12
Single shut-off (UHA)
Figure 4: Hydrant open
P7/19
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