…
,u
'
°
'
-
71'
Vibrator pumps are best
from a strong hook so that
,
they do not come into contact with anything which might aniplify
'
'
the vibration. Many pumps are provided with a hole for this pur—
pose, moulded into a rubber
but this should not be relied
‘
on
as
in use the rubber often splits. If the pump is placed upon a
smooth surface it may ‘Walk’ about under the influence of its internal
vibrations and some have been known to creep off shelves in this
way! Pumps must not be silenced by shutting up in boxes or very
_
-
small cupboards as they tend to
without adequate air
circulation. If they are mounted level with, or below, the surface
of the water in an aquarium, and particularly if
on the floor
below it, they must have a non—return valve fittedin the supply line.
If this is not done, when they are switched off (or if a power failure '
«
occurs), the aquarium may empty via the pump due to a siphon
action through an open valve. To make matters w’orse, the pump
'
…
subsequently floods internally and if switched on again, as happens
automatiCally at the end of a power,failure, may promptly explode
_or
at least be severely damaged.» The non-return valve prevents this
happening, and if this is _not fitted, the pump
must be installedat
:
least a. foot above the water level.
Maintenance of vibrator pumps usually involves only the replace‘
ment of burst diaphragms and the periodic cleaning of the small rubber
'
‘
flap valves if the pump _is used in a dusty atmosphere without an in—
F
…
put air filter. Parts are generally readily available and the practical
_
'
aquarist should be able to carryout all repairs himself. One Word
É
caution should be noted. In some
rubber base 150nly
popped on or heldf-by a rubber lip,
base is eaSiliy
";f' i
the pump is working and in many'cas‘es the“mairis
1m,
-
m'ediately. accessible and often are not insùlated.
j
-
to receive an electric shock
[j
with the base removed unless eXtreme Caution
__
test the,
a vib'1tator pumpfit should“ be
_
so that the _diaphragm is visible and & length of
tubing, SâÿtW0
feet long, should be fitted to the outlet pipe. If
_
switched on @emembering-the advice in “the previouspziragraph)
'
the tube pinched shut near the pump
thed1aphragm:
rise” up c0‘nSi‘derably under the influence of the backpressurc
created
the trapped air. 'The rising ‘actio'ri— ofthedm—
phragm "ShOWS that the ”inlè_t vàlve‘ is
condrt10nlftheplpels
n0WÏ}ÏCleased and pin—ched again“ at the end farth€StawaYflmthe
—
,u
'
°
'
-
71'
Vibrator pumps are best
from a strong hook so that
,
they do not come into contact with anything which might aniplify
'
'
the vibration. Many pumps are provided with a hole for this pur—
pose, moulded into a rubber
but this should not be relied
‘
on
as
in use the rubber often splits. If the pump is placed upon a
smooth surface it may ‘Walk’ about under the influence of its internal
vibrations and some have been known to creep off shelves in this
way! Pumps must not be silenced by shutting up in boxes or very
_
-
small cupboards as they tend to
without adequate air
circulation. If they are mounted level with, or below, the surface
of the water in an aquarium, and particularly if
on the floor
below it, they must have a non—return valve fittedin the supply line.
If this is not done, when they are switched off (or if a power failure '
«
occurs), the aquarium may empty via the pump due to a siphon
action through an open valve. To make matters w’orse, the pump
'
…
subsequently floods internally and if switched on again, as happens
automatiCally at the end of a power,failure, may promptly explode
_or
at least be severely damaged.» The non-return valve prevents this
happening, and if this is _not fitted, the pump
must be installedat
:
least a. foot above the water level.
Maintenance of vibrator pumps usually involves only the replace‘
ment of burst diaphragms and the periodic cleaning of the small rubber
'
‘
flap valves if the pump _is used in a dusty atmosphere without an in—
F
…
put air filter. Parts are generally readily available and the practical
_
'
aquarist should be able to carryout all repairs himself. One Word
É
caution should be noted. In some
rubber base 150nly
popped on or heldf-by a rubber lip,
base is eaSiliy
";f' i
the pump is working and in many'cas‘es the“mairis
1m,
-
m'ediately. accessible and often are not insùlated.
j
-
to receive an electric shock
[j
with the base removed unless eXtreme Caution
__
test the,
a vib'1tator pumpfit should“ be
_
so that the _diaphragm is visible and & length of
tubing, SâÿtW0
feet long, should be fitted to the outlet pipe. If
_
switched on @emembering-the advice in “the previouspziragraph)
'
the tube pinched shut near the pump
thed1aphragm:
rise” up c0‘nSi‘derably under the influence of the backpressurc
created
the trapped air. 'The rising ‘actio'ri— ofthedm—
phragm "ShOWS that the ”inlè_t vàlve‘ is
condrt10nlftheplpels
n0WÏ}ÏCleased and pin—ched again“ at the end farth€StawaYflmthe
—