4
Scope
Storage
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 4) 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 5) 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 6).
Note: some installations may present unique
circumstances that may require installation in
a position different than outlined above.
The WKM DynaCentric MB High Performance
Butterfly Valve offers all the benefits of a wafer
valve -smaller size, lower price, lighter weight and
throttling capabilities - and the high performance
characteristics of ball and gate valves. Because of
their quarter turn operation, they are easily and
economically adapted to power actuation.
The WKM DynaCentric MB High Performance
Butterfly Valve is available in 2-1/2" thru 36" 150
and 300 pressure classes.
The valve is available in both flangeless wafer
style and single flanged tapped lug style.
After assembly and test, The WKM DynaCentric
MB High Performance Butterfly Valves are placed
in the closed position. Carbon steel valve internals
are coated with rust preventative and painted on
the external surfaces. 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.
Figure 4
Preferred Position - Seat Upstream
Figure 5
Seat Downstream (Fail Close)
Figure 6
Stem Horizontal
IOM-WKM-HPBV-MBInstallation, Operation and Maintenance Manual
DISTRIBUTED VALVES
