WEY KNIFE GATE VALVE MF/MG/MH | Instruction manual
Based upon type of flange gasket, manufacturer's instructions are to be observed. It is
to ensure that the flange connection is tight. Leakage can be dangerous to humans
and environment.
The installation as an end or head valve requires special attention. In service, the downstream side must not be
accessible for persons. See also chapter 1.2 and 4.2.
For hazardous service media double transverse seals with respective leakage ports are incorporated and must be
compellingly connected to ensure a controlled drain-off of possible leak fluids.
After installation a correct earthing connection must be verified. This is normally done through the flange bolt
connection. If this is not the case, the potential or guard wire must be drawn to the terminal clamp.
Should there be a longer time period between mounting and power connection of electrically operated valves, it
shall be ensured that the integral heater of the actuator is already connected during mounting of the valves in
order to avoid the formation of condensate water (or protect actuator with suitable drying agent).
4Commissioning
4.1 General measures
Before taking the valves into service, all function relevant parts (gate, stem, piston rod, etc.) shall be thoroughly
cleaned. Damages, in particular to the seal caused by remains of grit, welding beads, foreign rust or similar on
the gate, are not covered by the warranty.
For powder or granular service, it should be observed that wetted or humid media which has tendency to cake to
the gate is thoroughly removed before start-up.
The Wey Knife gate valves are factory preserved and lubricated for transportation and storage, but they require
depending on the service conditions, another lubrication before start-up. Recommended are water-repellent,
temperature resistant and long lasting lubricants. (Get your nearest supplier’s recommendation).
4.2 Safety measures
For automated valves installed in an area where valve movement could be dangerous for people (or
animals/objects), it must be ensured by the user on-site that all moving parts are fenced with a suitable cover or
protection shield.
Should they not already be mounted, such covers are optionally available from manufacturer. Protection goals
can also be reached through suitable on-site measure. Unprotected valves must not be commissioned.
