Manntek DDC Original operating manual

manntek.se
DDC Service instruction
2” tank unit

2 of 8 – Version 170814

3 of 8 – Version 170814
T ANK U NIT 2”
M ATERIAL : A L , B R , SS
P ARTS NEEDED FOR SERVICE : Spare part kit and O-ring kit (see page 4)
Tool: Hexagon wrench No. 2
P ERFORM A SERVICE : If leaking
Every year
Change of media
P LEASE NOTE !
Make sure that you are using the right type of O-rings and seals for the
media you are using. We are using a standard silicone based grease for
standard media, for special media please contact us.

4 of 8 – Version 170814
M AINTENANCE AND SERVICE INSTRUCTION
Always depressurise the system and rinse off the parts before beginning any
maintenance work. Use protective goggles. Do not handle O-ring seals if the
material appears charred, gummy or sticky.
Use tweezers and wear neoprene or PVC gloves. Do not touch adjacent parts
with unprotected hands. Rinse off the parts once again before starting the “daily
inspection”
D AILY INSPECTION
1. Inspect the coupling surface for cleanliness and corrosion.
2. Inspect the O-ring in the house unit connection for serviceability and correct seating
in the grove.
3. Inspect the hose unit swivel for free rotation.
4. Inspect the tank- and hose unit for faultlessness and external signs of seizure.
T HREE - MONTH INSPECTION
1. Exterior cleaning of the coupling halves with a neutral cleanser.
2. Careful “daily inspection” of cleaned units.
O NCE A YEAR
1. Exchange sealing and washer at least once a year.
2. Refill the hose unit ball bearing grooves with grease
3. Replace worn or damaged components. Repair procedures are straightforward and
no special tools are required.
Check the state of the connection surface and verify that it is clean before proceeding
with the connection.
Couple the repaired unit to a serviceable hose or tank unit as appropriate and check for
correct operation of the valve actuating and bayonet locking mechanism. Couple and
uncouple the unit(s) several times.
U SE ONLY ORIGINAL M ANN T EK SPARE PARTS FOR MAINTENANCE .
Spare part kit (S-T2-xx)
O-ring kit (O-T2-yy)
xx and yy means the material key according to the product catalogue. You will find it
also as the 6
th
to 9
th
sign in the serial number (eg. T207AxxyyB).

5 of 8 – Version 170814
Remove the flat sealing
NPT-thread doesn’t have a flat sealing.
Make sure you don’t scratch the seal face.
Press down the spindle steering and turn it
free.
Take out all the parts from the body (spindle
steering, springcap, spring, piston).
Replace the PTFE bushing (pos.5) in the
spindle steering with a new one.
Replace the O-ring on the piston with a new
greased O-ring (pos.3).

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Have an equal pressure around the O-ring.
The O-ring must be pressed into the groove
on the piston.
Put the piston into a relaxing position in the
valve seat.
Replace the spring (pos.7), springcap
(pos.6) and the spindle steering (pos.4).
Press down the spindle steering and turn, to
fix it in its position.
Make sure that the spindle steering is in its
right position.

7 of 8 – Version 170814
Assemble a new flat sealing (pos.12). NPT-
thread and flange does not have a flat
sealing.
Finally, make a visual inspection that
everything is in its right place. Do also a test
connection/disconnection with a hose unit
that not is mounted and not has any fluid
inside. If the coupling works all right you
are ready to use it again.
Loctite® is registered trademark of Henkel.

8 of 8 – Version 170814
TEST PROCEDURE
After each service a pressure and tightness test of each coupling is mandatory. If only
the O-Ring kit is replaced a seat tightness test is enough.
The following test parameters are in accordance with EN12266 and EN14432:
Test procedure Test pressure Acceptance criteria
Shell tightness test
(Water)
1,5 x working
pressure No visually detectable
leakage for the
duration of the test
Seat tightness test
(Air)
6 bar +/- 1 bar
Max 0,3 bar
Table 1 – Test pressure
Nominal size Minimum test duration
Up to DN 50 15 s
DN 65 to DN 150 60 s
Table 2 – Minimum test duration
T EST P ROCEDURE :
•Fill the downstream valve cavity including, if appropriate, the cover cavity with the
test fluid.
•Apply the test pressure specified in Table 1 in the direction tending to close the
obturator.
•Maintain the test pressure for the test duration specified in Table 2.
•Determine the leakage rate.
If a pressure test should be achieved for the coupling mounted in an assembly follow
the respective test instructions for the equipment but do not exceed 1,5 x Working
Pressure of the coupling.
S TORAGE
Store coupling in a dry, dust free, dark place, in ambient temperature.
© Copyright 2008 Mann Teknik AB. Mann Teknik AB reserves the right to make changes at any time in
prices, materials, specifications and models and to discontinue models without notice or obligations.