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inlet with flow in the direction of the arrow
and with the bellows element facing
upwards.
It is recommended that a strainer should
be inserted before the valve.
The bulb is to be fitted where it is required
to maintain or control the water
temperature.
The bulb can be fitted warmer or colder
than the valve body, with no effect on the
regulating capacity.
The bulb must be fitted horizontally or
with the blank end of the bulb at the
lowest level.
The capitals UP and the red line on the
bulb must face upwards at horizontal or
inclined fitting.
On condensers (Fig. 3) the bulb can either
be fixed to the discharge pipe by means of
a clip, be inserted in a pocket or placed in
direct contact with the cooling water.
When the plant is started, the bulb must
be affected at once by the temperature
variations of the cooling water flow. A
bypass with a shut-off valve can, therefore,
be necessary in order to ensure a cooling
water flow during start-up.
If the bulb is fitted in direct contact with
the cooling water, it must be fixed so that
pulsations cannot affect the bulb and thus
destroy the capillary tube. If a bulb pocket
is used, good heat transmission is obtained
by filling the pocket with heat-conductive
compound.
On air compressors and similar equipment
the bulb is fitted in the water-filled cooling
jacket. No bypass is required. The heating
of the water at the start of the compressor
always ensures a suitable impulse to the
bulb.
Setting
Place a thermometer at the point where
the bulb is fitted.
Remove the cover (6a). Turn the regulating
nut (5) to adjust the medium flow until
the thermometer shows the required
temperature on the discharge side. A lower
temperature can be obtained by turning
the regulating nut (5) anti-clockwise (to
slacken the regulating spring) – and vice
versa.
When the refrigeration system stops, the
temperature drops at the bulb, and so
WVTS closes.
Service
The water valve must close tightly when
the refrigeration system is stopped. If not, it
may be due to the fact that large impurities
have settled on the valve seat of the servo
piston of pilot cone. The strainer (20) or the
pilot nozzle (21) may be clogged up.
Impurities can be removed as shown in
Fig. 4. Insert a screwdriver between the
pilot cone spindle (8) and the push rod
(4). Tilting the screwdriver forces the pilot
cone down, and the valve opens to full
cooling water flow.
If still the water valve does not close
© Danfoss | DCS (jmn) | 2016.02
tightly, shut off the cooling water supply
to the water valve. Unscrew the strainer
assembly (19) and clean both the strainer
and the pilot nozzle.
If the strainer or pilot nozzle is not
clogged up, dismount the top part (6)
and the valve cover (12), which can be
done without relieving the system of its
pressure. Remove the strainer assembly
from the valve cover, clean it, and apply
a coat of water-resistant, acid-free grease
to it. Fill the same kind of grease into the
space over the Teflon sleeves (9). It may be
necessary to grind the pilot cone in its seat.
Clean the servo piston and valve seat and
apply a coat of water-resistant, acid-free
grease to the servo cylinder and the servo
piston guide.
The pilot channels in the valve cover can
be cleaned after the screws have been
unscrewed from the sides of the valve
cover.
Check whether the O-rings need
replacement.
After fitting or overhaul the water valve
must be flushed vigorously for some
minutes in order to remove any impurities
from pipelines, etc. See Fig. 4.
If there is any risk of the valve bursting
due to frost during standstill periods, it
should be drained of water. It can be done
by unscrewing the drain plug (17) and the
bottom screw (16).
DANSK
Termostatiske vandventiler
Tekniske data (Fig. 1–3)
1.
Føler
2.
Pakdåse
3.
Bælgelement
4.
Trykstang
5.
Reguleringsmøtrik
6.
Indstillingshus
6a. Dæksel
7.
Pilotindsats
8.
Pilotkegle
9.
Teflonmanchetter
10.
Isolationsskive
10a. Pakning for pilotindsats
11.
O-ring for pilotindsats
12.
Dæksel
13.
O-ring for dæksel
14.
O-ring for pilotkanal
15.
Servostempel
16.
Bundskrue for servostempel
17.
Bundprop
18.
Pakning for bundprop
19.
Komplet filterindsats
20.
Selvrensende filter
21.
Pilotdyse
22.
Pakning
23.
O-ring
24.
Servofjeder
*
Angiv ventilstørrelsen.
**
Se tabellen fig. 5.
Samling
Skruer, der forbinder pilotenhed med
Ventilhus der skal spændes med 8,5 Nm.
Maks. prøvningstryk
16 ato (Pe = 16 bar = 1600 kPa)
Åbningsdifferenstryk
WVTS 32 - WVTS 40:
Min. 0.5 at (0.5 bar = 50 kPa)
Maks. 4 at (4 bar = 400 kPa)
WVTS 50 - WVTS 100:
Min. 0.3 at (0.3 bar = 30 kPa)
Maks. 4 at (4 bar = 400 kPa)
Hvis WVTS ønskes med et differenstryk på
1 – 10 at (1 – 10 bar, 100 – 1000 kPa),
udskiftes servofjederen (24). Se
bestillingstabellen, fig. 5.
Tilladelig medietemperatur
For vand: Maks. 90 °C
For brine: Min. -25 °C
Maks. følertemperatur
57 °C for området 0 – 30 °C
90 °C for området 25 – 65 °C
125 °C for området 50 – 90 °C
Montering
WVTS monteres i kølevandstilgangen med
gen-nemstrømning i pilens retning og
med bælg-elementet opad. Det anbefales
at montere et smudsfilter foran ventilen.
Føleren anbringes, hvor den ønskede
vand-temperatur skal overholdes.
Føleren kan uden indvirkning på
regule-ringsevnen anbringes varmere eller
koldere end ventilhuset.
De øvrige områder skal føleren monteres
vandret eller med følerens frie ende lavest.
Bogstaverne UP og den røde streg på
føleren skal vende opad ved vandret eller
skrå montering.
På kondensatorer (fig. 3) kan føleren
enten fastgøres til afgangsrøret med
spændebånd, monteres i en følerlomme
i afgangsrøret eller anbringes i direkte
kontakt med kølevandet.
Ved anlæggets start skal føleren straks
kunne påvirkes af det strømmende
kølevands temperaturvariationer. Derfor
kan et omløb med en afspærringsventil
være nødvendigt for at sikre en
kølevandsstrøm under opstart.
Monteres føleren i direkte kontakt med
kølevandet, fastgøres den, så pulsationer
ikke kan påvirke føleren og derved
ødelægge kapillarrøret.
*
Anvendes følerlomme, opnås en god
varme-overgang, når lommen fyldes med
*
kobberpasta.
På luftkompressorer og lignende
monteres føleren i den vandfyldte
kølekappe. Et omløb er ikke nødvendigt
*
her. Opvarmningen af vandet ved
kompressorens start giver altid
tilstrækkelig impuls til føleren.
Indstilling
**
Anbring et termometer på det sted, hvor
føleren er placeret.
Fjern dækslet (6a). Med
reguleringsmøtrikken (5) reguleres
mediets gennemstrømning, indtil
termometeret viser den ønskede
temperatur på afgangssiden.
DKRCC.PI.DB0.A1.52 | 520H10725 | 2
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