OPERATING MANUAL
07-2022
4/14
•
The minimum valve switch-over time (to close or open) dependent on the DN size (nominal diameter) is listed
in Table 2:
DN (mm)
Switch-over time (s)
40÷350
10
400÷600
16
700÷800
40
900÷1200
50
Table 2. Minimum valve switch-over time
The valve switch-over time is the minimum time to close or open the valve connected to a pump which delivers
a medium. The time values listed in Table 2 are calculated with the following formula:
𝑇 =
𝐿 ∙ 𝑉
𝑔 ∙ ℎ ∙ (𝑘 − 1)
∙ √𝑘
T –> switch-over time (s)
L –> piping length (m)
g –> 9.81(m/s
2
),
h –> nominal pressure in metres of sweet water
column
V –> flow rate (m/s)
k –> shock wave pressure rise factor, calculated
in relation to the nominal pressure (1-1.25)
The listed time values from Table 2 are calculated for:
L=500(m), V= 4(m/s), k= 1.25
. If the closing time is shorter,
it is mandatory to install water hammer dampers (and standard safety valves are unfit for this application).
•
Valve control mode: the standard version of the valve has the clockwise closing sense of rotation. The closing
sense of rotation can be opposite on special order. The standard valve version control is operated with a self-
retarding worm gearbox. It is possible to control the valves with electric actuators. The following is the
standard for the version with electric actuator:
➢
Product 4493SQ: applies to DN200 - DN400; control is carried out by the SQ electromechanical
part-turn actuator from AUMA,
➢
Product 4493SA: applies to DN500 - DN2000; the control is carried out by the SA
electromechanical multi-turn actuator and a GS part-turn gearbox from AUMA.
•
Connection flanges are manufactured in accordance with EN 1092-2 (
Flanges and their joints
.
Circular
flanges for pipes, valves, fittings and accessories, PN. Cast iron flanges
) and in sizes suitable for nominal
pressure ratings.
•
The installation (face to face) length and its tolerance are per EN 558 (
Industrial valves. Face-to-face and
centre-to-face dimensions of metal valves for use in flanged pipe systems. Valves with PN and class marking
);
Series 14.
•
Butterfly valves with a soft seal (
4493, 4493SQ, 4493SA
) in diameters DN200 ÷ DN2000 have a double-
seated cover (
disk
). The valve pivot shafts are held by the necks, mounted on additional bearing sleeves. The
pivot shafts are sealed by the packing gland assembly, comprising an arrangement of o-rings. The butterfly
valve is closed with a cast iron disc fitted with an elastomer seal. One of the shafts is used to control the valves.
The second shaft is enclosed and is used to evenly distribute the moments acting on the butterfly valve disk.
In the case of underground installations, the valve must have a part-turn gearbox connected to the fixed
housing Product Number 9025. Such a configured valve can be controlled with: T key - Product Number
9015,
➢
➢
Stand with opening indicator - Product Number 9113,
➢
Stand for actuator - Product Number 9114.
➢
Stand for actuator - Product Number 9114 + additional equipment (
electromechanical actuator
)
For more information on installation of valves in underground pipework, see point 5.2.
Installation
instructions
).
