Appendix
Wafer Check Valve K6 PVC
Dismounting of disc
Lift up safety clip with disc
From DN350 unscrew safety clips. After that disc can be removed from
the body.
Dismounting of disc O-ring
Lift up O-ring with sharp screw driver or pin.
ATTENTION: Do not damage disc.
As far as you can grab the O-ring, pull the O-ring out of the groove.
ATTENTION: O-ring is damaged by dismounting and must not be used
again!
Assembling of disc O-ring
Important: proper cleaning of O-ring groove and put some adequate grease on the O-ring. Put
O-ring on the groove and press it crosswise into the groove. Finally run a finger round of the O-
ring for proper seating.
ATTENTION for proper O-ring seating! O-ring must be fully and plain in the groove.
Assembling of body O-ring (front and rear)
Proper cleaning of O-ring grooves then insert the O-ring into front and rear groove.
Assembling of spring on the disc
Put the spring on shafts like shown in the picture besides. On side
after the other!
ATTENTION: Do not put spring at the same time on both shafts you
may overstretch the spring.
Kindly mind that the spring is on top side of disc.
Sticking on the label
The labels for the EPDM or FPM version are included in the
spring set. Clean and degrease the adhesive surface of the valve
body. Depending on the sealing, stick the according label on
position (see picture).
ATTENTION: the arrow on the label shows the direction of flow
und must point towards direction of the valve opening.
Assembling of Disc into the body
Put the disc into the body. Clip in the safety clips in both shafts.
ATTENTION: For dimension DN40 / d50 safety clips are different
style therefore safety clip is marked with “L“ and "R"
From DN350 the safety clips are screwed.
ATTENTION: Safety clips must not recover from the body.
Pos.
Description
1
Body
2
Disc
3
Safety clip for disc
4
O-ring disc
5
O-ring body (front)
6
O-ring body (rear)
7
Spring
8
Labeling
Guarantee and warranty
Valves, fittings and pipes delivered by Praher Plastics Austria GmbH are developed and produced according to
international and national standards. Our products have to be exclusively used in the appropriate applications
fields. In this regards, the technical data sheet (pressure-loss-diagram) as well as the operation manual (correct
installation, dismounting) and technical regulations published by the plastics industry as well as chemical
resistance lists must be complied with. Modifications on the product realized on a stand-alone basis are the
responsibility and the risk of the plant manufacturer. Information regarding certificates and eligibility for
certifications can be found in the manufacturer’s declaration. Declarations of conformity for the corresponding
valves are available according to the pressure equipment directive.
Leak and function tests have to be carried out before commissioning. After the pressure test, all nuts and
screws of the entire pipe system must be retightened in a depressurized state.
We recommend a maintenance service (testing of functionality and tightness) and careful visual inspection in
regular maintenance intervals minimum once a year, whereas with highly aggressive media, strong vibrations
and significant variations of temperature, the intervals should be shortened. Seals must be considered as wear
materials and must be lubricated and/or changed regularly. Valves that are kept permanently in the same
position should be operated 1-2x a year to check full functionality and tightness.
With unfiltered media we recommend the installation of line strainers.
Before returning the product, we kindly ask you to inform our representation in your country. In order to make
a guarantee claim, it is necessary to demonstrate that a test of functionality and tightness has been carried
out.
Further information as well as above mentioned information sheets can be provided by our representation in
your country or under
Our products are improved continuously in regards to technical progress and further development. Thus, we
reserve the right to implement changes and improvements without notice.
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