Danfoss WVTS 40, WVTS 50, WVTS 100 Installation guide [da]

Installation guide

Thermostatic water valves

WVTS

WVTS 40 WVTS 50 - WVTS 100

016R9557

Fig. 1 Fig. 2

Type

WVTS 32 016D1327 WVTS 40 016D0575 WVTS 50 016D0576 WVTS 65 016D0577 WVTS 80 016D0578 WVTS 100 016D0579

Spring / Fjeder / Feder / Ressort

1 – 10 bar (100 – 1000 kPa)

016R9557

Fig. 3 Fig. 4 Fig. 5

ENGLISH

Thermostatic Water Valves Technical data (Fig. 1–3)

1. Bulb

2. Stuﬃng box

3. Bellows element

4. Push rod

5. Regulating nut

6. Top part 6a. Cover

7. Pilot insert

8. Pilot cone

9. Teﬂon sleeves

10. Insulating disc 10a. Pilot insert seal

11. Pilot insert O-ring

12. Co ve r

13. O-ring for cover *

14. O-ring for pilot channel

15. Servo piston *

16. Servo piston button screw

17. Drain plug

18. Drain plug gasket

19. Strainer assembly, complete *

20. Self-cleaning strainer

21. Pilot nozzle

22. Gasket

23. O-ring

24. Servo spring ** * Please state valve size. ** See table Fig. 5.

Assembly Screws connecting pilot unit with valve body to be tighten with 8.5 Nm.

Max. test pressure

16 atm.g (pe = 16 bar = 1600 kPa)

Opening diﬀerential pressure

WVTS 32 - WVTS 40:

Min. 0.5 atm. (0.5 bar = 50 kPa)

WVTS 50 - WVTS 100:

If WVTS is required with a diﬀerential pressure of 1 – 10 atm. (1 – 10 bar; 100 – 1000 kPa), the servo spring (24) is to be replaced. See ordering table, Fig. 5.

Permissible temperature of medium

For water: Max. 90 °C For brine: Min. -25 °C

Max. bulb temperature 57 °C for the range of 0 – 30 °C 90 °C for the range of 25 – 65 °C 125 °C for the range of 50 – 90 °C

Fitting

WVTS is to be ﬁtted in the cooling water

Max. 4 atm. (4 bar = 400 kPa)

Min. 0.3 atm. (0.3 bar = 30 kPa) Max. 4 atm. (4 bar = 400 kPa)

DKRCC.PI.DB0.A1.52 | 520H10725 | 1

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

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. Tr ykstang

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

+ 2 hidden pages