Page 7 of 10
Copyright © AVK Holding A/S, original version, rev. 10, 30-June-2020
7. Installation and commissioning
The valve is sensible to dust and dirt on its upper parts where the piston slides in the cylinder,
so if installed outdoors or in a dusty or otherwise dirty environment it must be protected in a
suitable valve chamber with sufficient cover from objects and debris falling from above.
Do not install closer than 6 pipe diameters downstream of tees or elbows or other irregularities;
this can cause violent turbulence and cavitation inside the valve and reduce its performance
and durability.
WARNING: Prior to installation make sure that all pressurized lines involved in the installation
are isolated, depressurized and drained before starting any work. Failure to do so may result in
sudden pressure release and subsequent severe injury or death.
•
Position the valve housing on the flange and fit the bolts
•
Tighten the bolts diagonally in increments to make sure the flanges are kept parallel and
finally tighten to correct torque
•
Assemble lever and float with the filler cap pointing upwards, install them on the valve
housing with the fulcrum and hinge pins and secure them with split pins
•
Check for freedom of movement and alignment
•
Make sure the valve sealing areas are clean and lubricated with a lubricant suitable for
the medium
•
If necessary to touch up coating that has been damaged during installation, make sure
that no paint is applied to the bearings or sealing surfaces.
When the pipeline has been charged, inspect for leaks and adjust as necessary in accordance
with the maintenance instructions.
Operate the valve over a full stroke and check for free movement.
8. Application hazards
Unless properly isolated the valve should not be installed in applications where the ambient
temperature can reach values below the freezing point of the liquid.
The seals are exceptionally well suited for use with water but exposed to hydrocarbons they will
dissolve and render the valve leaking.
Do not use with flammable liquids.
Saltwater and brine will corrode the standard materials used in the valve, but alternative more
corrosion-resistant materials may be available; contact AVK for further information.
Operation at max. allowed pressure and very low flow for prolonged periods can cause
cavitation and damage to the valve seat.
