Management of Change Guide: Replacement of Masoneilan Camflex Valve Assemblies with Fisher Vee-Ball Valves with 1068 Actuators
Fisher Management of Change Guide: Replacement of Masoneilan Camflex Valve Assemblies with Fisher Vee-Ball Valves with 1068 Actuators Manuals & Guides
Management of Change Guide
Replacement of Masoneilan Camex Valve
Assemblies with Fisher™ Vee-Ball™ Valves
with 1068 Actuators
Table of Contents
Background ....................................................2
Question & Answer Checklist ..........................4
January 2021
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Background
Many industrial plants use the Masoneilan Camex valve for a wide range of control
valve applications. Replacing a Camex valve with a standard Fisher rotary valve
is not straightforward because the standard Camex product only rotates 60°.
The main issue with replacing the Camex valve with the same size Fisher Vee-Ball
product is the Vee-Ball ow capacity is much greater at 90° rotation than the same
nominal size 60° rotation Camex valve.
In many facilities, this extra capacity will require the end user to review safety
relief valves/systems. The extra expense of performing the safety analysis let alone
actually replacing the safety equipment can drive end users to stay with Camex
valve. However, some end users can justify this investment, look at using a smaller
nominal size valve, or use an actuator travel stop to get “close enough” to the
Camex published capacity. Since that is not a one size ts all option, Emerson
investigated developing a package solution.
For those of you who have been with the organization long enough, you will
remember this is not the rst foray into developing a Fisher packaged solution
targeted at Camex replacements. Unlike today’s packaged design, the legacy
Fisher ePlug complete package utilized the Fisher V500 valve platform and was not
market competitive. This time we are utilizing the more cost-effective Vee-Ball valve
and consulted direct sales channels to better understand the target market price.
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While the Fisher 2052 actuator was investigated for this package, it was quickly
ruled out. In the 2052 design, the maximum restriction of travel (longest travel stop
bolt allowed) is limited to 60° of rotation. To match the Camex full-open capacity,
all sizes except the NPS 8 Vee-Ball valve require less than 60° of rotation. In addition,
the standard travel stops in the 2052 actuator are adjustable, which many end users
do not allow.
A xed travel Fisher 1068 actuator was designed to limit travel of the V150, V200,
and V300 Vee-Ball valves to specically match the Camex product rated Cv
capacity (100% open).
Some customers require actuator travel restrictions to be non-adjustable for
safety valve sizing. The xed travel 1068 actuator in this package uses an internal
restriction that is not eld adjustable, nor accessible.
The 1068 spring return actuator size 5i to 15i provides the same control
performance as a 2052 actuator when used with a square shaft Vee-Ball valve. This
is accomplished with a zero backlash square-to-square shaft coupling system.
You may recognize that in addition to the full capacity Camex valve, there are
restricted trim options in the Camex design. While we have heard anecdotally that
the majority of Camex installations do not use the restricted trim, we will make
available Fisher special seat ring retainers to match the restrictions of the Camex
valve when required.
Fisher Vee-Ball valve with 1068 actuator and
FIELDVUE DVC6200 digital valve controller.
2
The 1068 actuator construction to be used is all standard materials, except
the standard external travel stops are removed and replaced with internal nonadjustable travel stops as shown below.
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The actuator-to-valve connection does not use a typical Fisher splined connection.
It uses a newly designed bolted square-to-square connector as shown below. The
accuracy of the actuator is shown in Table 1.
3
Product Linearity % Hysteresis/ Deadband %
1068 Double Acting .33 .89
1068 Spring Return .33 .73
Fisher 1051 .30 .38
Fisher 1061 .49 .45
Fisher 585 .40 .52
Table 1. Actuator Linearity and Hysteresis / Deadband Percentages
The Fisher 1068 actuator’s linear response is in-line with all the Fisher actuator
products. The hysteresis and deadband is slightly higher but much better than a
rack and pinion product at 2 to 5% accurate.
The actuator also comes standard with the ability to mount a Fisher FIELDVUE
DVC2000 or DVC6200 digital valve controller with no additional mounting parts.
The mounting is shipped installed on the actuator including the magnetic array.
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For the Vee-Ball valve and the FIELDVUE digital valve controller, all models and options are available.
Question & Answer Checklist
Q: Does a Fisher Vee-Ball valve have the same face-to-face dimensions as
1
2
a Camex valve?
A: Yes.
Q: Are all the sizes, pressure classes, and ange ratings offered by the
Camex valve available with a Fisher Vee-Ball valve?
A: Yes, plus the 16” and 20” sizes not available in a Camex valve.
4
Q: Does Emerson offer a digital positioner like the Camex valve does?
3
A: Yes, Fisher FIELDVUE DVC2000 or DVC6200 digital valve controllers.
Q: Does the Fisher valve offer the same material selections as Camex
4
5
valve?
A: Yes.
Q: Does the Fisher valve offer the same linear control as the Camex
valve?
A: No, the Fisher Vee-Ball valve will provide a better controllability with
its equal percentage ow characteristic of a segmented ball valve.
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Q: Will the Cv of the Fisher Vee-Ball valve match the Camex valve so my
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7
8
9
10
relief valve sizing is still correct?
A: Yes, the newly designed internal travel stop in the Fisher 1068
actuator has been designed to reduce the travel of the Vee-Ball valve
to match that of the Camex product.
Q: Does the proposed offering cause any changes to the piping and
instrumentation diagram (P&ID)?
A: No.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: No, with the equal percentage ow characteristic versus the linear
Camex valve, operations should have overall better process control.
Q: Does the proposed change how the existing plant is operated?
A: No.
Q: Does the proposed modication change the process ow rates?
A: No.
Q: Have the codes and standards to which the equipment was designed
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to changed?
A: No.
5
Q: Will the operating and design conditions (ow, temperature,
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13
14
15
pressure) of my line change because of this change?
A: No.
Q: Does the proposed change modify the materials of construction such
as a change in material form (cast, forged, or alloy)?
A: No.
Q: Does the proposed change effect operator training requirements?
A: No.
Q: Does the proposed change introduce new equipment, instruction
manuals and maintenance training?
A: Yes, see the appropriate product Instruction Manuals.
- Fisher 1068 Actuator Instruction Manual (D104405X012)
- Fisher Vee-Ball Valves Valves Instruction Manual (D101554X012)
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Q: Can the Fisher 1068 actuator operate at multiple plant supply
16
17
pressures?
A: Yes
Q: In case of a space issue, can the 1068 actuator with Vee-Ball valve
assembly be installed in other positions besides just vertical?
A: Yes, the assembly can be installed in any position.
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