7
TC-003001-10/ Rev 2
Flange protection is provided for all valves. Valves should be stored in a clean, dry location. Outdoor storage is
permissible, but should be off the ground and protected from the elements. For long term storage, contact your
Cameron representative.
INSTALLATION AND OPERATION INSTRUCTIONS
INSTALLATION
Although The WKM DynaCentric MB High Performance Butterfly Valves have Bi-directional sealing capabilities and
will operate in most positions, the following positions are generally recommended for specific applications.
Flow Direction -
Normally the preferred position is with the seat upstream (Figure 6) where the seat retainer provides protection
for the seat against erosion due to line flow. This position also reduces operating torque and provides better
throttling characteristics.
For handle operated valves – or valves in fail- closed service – the seat should be downstream (Figure 7) with the
stem side of the disc facing the flow. This position results in positive closing torque with increasing pressure and
reduces the hazard associated with handle operation.
Although The WKM DynaCentric MB High Performance Butterfly Valves will seal with flow from either direction,
switching flow from side to side should be avoided. Once a flow direction is established, the seat tends to conform
to the disc edge and may take a set making it difficult to establish a seal from the opposite direction.
Stem Position -
The WKM DynaCentric MB High Performance Butterfly Valves perform equally well with the stem in the vertical or
horizontal position. However, the stem horizontal position is always preferred. When the lading contains solids,
which can build up over long periods of closure, it is particularly important that this position be used. A flushing
action of the flow media during opening and closing cycles cleans sediment from the bottom of the line by a jetting
action. When such action is desired, the valve should be installed with the seat upstream (flow from the seat side
of the valve) with the integral disc stop in the vertical up position (Figure 8).
Figure 6 – Preferred Position
Seat Upstream
Figure 7 – Seat Downstream
(Fail Close)
Figure 8 – Stem Horizontal
