Service guide
Non-return valve
VCM 46
Disassembling and Assembling
The Service guide covers the instruction for
disassembling and assembling the VCM 46 Nonreturn valve.
IMPORTANT:
It is essential that the VCM 46 is serviced in
conditions of absolute cleanliness.
WARNING:
Do not use silicone when assembling the VCM
46. Do not reuse disassembled O-rings; they
might be damaged.
Always use new O-rings.
For a better understanding of the VCM 46, please
see the sectional view.
Tools needed:
• Snap ring pliers or nylon mandrel
• Screwdriver
Disassembling
1. Mount the VCM 46 into a vice with
aluminum trays.
2. Turn the nut CCW with snap ring pliers.
© Danfoss | DCS (im) | 2021.03
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Service guide | Disassembling and Assembling VCM 46
3. Alternatively use a mandrel made of nylon.
5. Remove the spring.
4. Remove the nut.
6. Remove the valve cone.
© Danfoss | DCS (im) | 2021.03
7. Remove the O-ring at the cone with a small
screw driver.
2. Remove the O-ring at the thread end of the
valve with a small screw driver.
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Service guide | Disassembling and Assembling VCM 46
Assembling
1. Lubrication:
• To prevent seizing-up, lubricate threads
with PTFE lubrication type.
• O-ring inside VCM 46 may be lubricated
only with clean ltered water.
• O-rings at the thread end must be
lubricated.
• It is important to lubricate ALL parts to
be assembled with clean ltered water.
2. Mount the lubricated O-ring at the thread
end of the valve.
3. Mount the water lubricated O-ring on the
cone. Ensure the O-ring is pushed fully into
the O-ring groove.
5. Mount the spring on the rod of the cone. 6. Lubricate the threads of the nut.
4. Mount the the cone.
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Service guide | Disassembling and Assembling VCM 46
7. Screw in the nut.
9. Alternatively use a plasitc mandrel.
8. Tighten the nut with a snap ring pliers.
© Danfoss | DCS (im) | 2021.03
Testing valve function:
Verify free movement of valve cone.
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Spare part list and
sectional drawing
Spare part list
Service interval
Pos. Qty. Designation Material Seal set
180H4000
4 1 O-ring 35.00 x 3.00 NBR x
6 1 O-ring 58.00 x 2.00 NBR x
4 years for inspection and exchanging O-rings as
needed.
Danfoss A/S
High Pressure Pumps
Nordborgvej 81
DK-6430 Nordborg
Denmark
© Danfoss | DCS (im) | 2021.03
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