Evoqua WALLACE & TIERNAN S10k, Instruction Manual

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S10k
Description
3.
15
If the operating water is shut off, the vacuum breakes down and
the vacuum demand valve interrupts the chlorine flow. The check
valve in the injector prevents water from entering the gas line. In
case of a leak in the tubing from the regulating valve to the injector
or in the chlorinator, only air can enter into the system, but no chlo-
rine can escape. If the vacuum demand valve leakes and pressu-
rized chlorine flows into the vacuum lines, a relief valve (6) blows
the chlorine into the vent line and into an activated carbon filter (5).
It is highly recommended to have the sensor of a gas monitoring
system installed in the chlorine room.
3.3 Vacuum demand valve
The standard vacuum demand valve is supplied for use with chlo-
rine, sulphur dioxide or carbon dioxide gas.
Warning!
The standard vacuum demand valve must not be used for ammo-
nia. Severe personal injury or damage to plant can occur if a va-
cuum demand valve is used with a gas for which it is not designed.
The vacuum demand valve must be connected in a way that only
gaseous gas can enter the valve, never liquid gas.
The function of the vacuum demand valve is to ensure that gas can
only flow from the storage cylinder into the vacuum line when the
vacuum created by the injector is present throughout the pipework.
The vacuum demand valve is supplied in the following assemblies:
• with screw connection for chlorine gas cylinders according to
DIN 477
• with screw connection for SO2 gas cylinders
• with nipple for CO
2
pressure hose connection
in the versions
• Shut-off valve (non switch-over), withdrawal from one gas
cylinder or gas manifold.
• Switch-over valve, withdrawal from two gas cylinders or gas
manifolds alternatingly.
Warning!
The vacuum demand valve must not be connected directly to a
drum valve. Liquid gas must be prevented from entering the valve.
Connection to a drum is described in chapter 4.4.2