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Note: The handwheel on Camflex II is designed to be used
for emergency action only.
The actuator is generally mounted with air-loading to counter
the dynamic torque on the plug. In Figure 2 the flow direction
tends to open the plug and the actuator is oriented to close it with
increasing air pressure. The actuator spring force assists plug
off-balance forces to open the valve on air failure. If the valve is
to close on air failure, the body would be turned around in the
line so that flow tends to close the plug and the actuator position
would be reversed.
The Camflex II valve has a modified linear flow characteristic,
which is the same in either flow direction. It can be easily
transformed to an equal percentage when equipping the
valve with a positioner 4700 series, 8000 series or SVI
Smart Valve Interface. Reduced TRIM factors 0.4 and 0.6
are available on all sizes. The flow capacity of a 0.4 factor
is 40% of the nominal capacity of the valve and it is 60%
for the 0.6 factor. Factors 0.1 and 0.2 are available on the
1" (DN 25) valve.
The ability of the Camflex II valve to handle a wide range of
process fluid temperatures is due to the long integrally cast
bonnet. This affords ample radiation surface to normalize the
packing temperature. Therefore, with self-lubricating TFE Aramid
fiber packing, the valve handles temperatures from -196°C to
+ 400°C (-321°F to +752°F). When insulating the valve, do not
insulate the valve bonnet (see Figure 3).
Figure 3
4. Unpacking
Care must be exercised when unpacking the valve to prevent
damage to the accessories and component parts. Should any
problems arise, contact your representative or district office.
Note: For ease of shipment and to prevent damage, valves
equipped with the spring diaphragm actuator are shipped
with the handwheel unassembled. Refer to Section 10.3 for
handwheel assembly procedures.
5. Installation
The Camflex II valve has been assembled at the factory in
accordance with specific instructions concerning flow direction
and actuator mode. The valve must be installed so that the
controlled substance will flow through the valve in the direction
indicated by the flow arrow (25), which is located on the upper
part of the valve bonnet. The valve actuator should be installed
so the actuator is above the centerline of the shaft. To install the
valve in the line, proceed as follows:
Any change in flow direction or actuator mode must be
accomplished as outlined in Sections 7 and 10 of this
instruction manual. Failure to follow these could result
in personal injury and equipment malfunction.
A.
Check the model number on the serial plate (56) against the
numbering System described in Figure 1 to determine the
valve mode.
B.
Clean piping and valve of all foreign material such as welding
chips, scale, oil, grease or dirt. Gasket surfaces should be
thoroughly cleaned to ensure leak proof connections.
C.
To allow for in-line inspection, maintenance or removal of
the valve without service interruption, provide a manually
operated stop valve on each side of the Camflex II valve with
a manually operated throttling valve mounted in the by-pass
line.
Figure 2
Plug
Seat Ring
Fluid Flow
Shaft
Guide Bushing
Flexible Arms
Guide Bushing
Air
Actuator
Lever
Handwheel
