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Flowserve Valtek FlowTop V726 User Instructions page 7

High performance control valve
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Valtek FlowTop
No.
6
Confirm the actuator has enough overhead clearance
to disassemble the plug from the valve body.
Removal Space
Actuator
Code
mm
253
503
701
180
1500
3000
Table 2: Overhead clearance dimensions
7
Confirm there are suitable straight piping run up-
stream and downstream of the valve installation site in
order to minimize a sudden pressure surge in the flow.
8
Confirm removal of all hazards and ensure appropri-
ate protective measures are in place.
9
Confirm flow direction to ensure the correct valve instal-
lation. Flow direction is indicated by the arrow on the
valve body.
10
Confirm that the air supply and instrument signal
lines are dry and clear of dirt and oil.
11
Confirm the valve is grounded in order to prevent an
electrical discharge.
12
In general - high or low temperature bonnets should
not be insulated.
13
Confirm that the bonnet bolting of valves used in
NACE MR 0175 / MR 0103 or ISO 15 156 applica-
tions are ventilated.
14
Throttling control valves are typically equipped with
a pneumatic actuator and valve positioner. Refer to
the appropriate positioner manual for connections
and maximum air supplies.
After these requirements are confirmed the valve can be installed and connected in the piping.
FCD VLEEIMFTOP-03 (EN/A4) June 2023
Check
≈ R
inch
mm
inch
290
11.4
330
13.0
7.1
345
13.6
415
16.3
Table 1: Basic safety massages for installing the valve
Possible malfunction or safety related incident
≈ R
Figure 6: Overhead clearance drawing
Absence of suitable piping lengths can create critical operating
conditions and cause unacceptable levels of noise and vibra-
tion.
none
Improper flow direction causes critical changes to operating
conditions that may damage the control valve.
At a minimum, the instrument air must conform to ISA- 7.0.01-
1996 (ISO 8573-1 Compressed Air - Class 2) requirement or
those of the accessory manufacturer.
Noncompliance may result in electrical discharges.
The purpose of an extended bonnet is to keep very high or low
temperatures away from the packing space, actuator and acces-
sories. However, insulation favors the temperature transfer there.
Do not cover or insulate over bonnet flange bolting !
The air supply must be limited to less than 87 psig (6 bar) per the ac-
tuator serial plate. An air filter regulator should be installed to ensure
that the supply pressure to the pneumatic actuator does not exceed
the air supply pressure indicated on the WW or EU serial plate.
Fa ce to fa ce
d im en si o n
s
flowserve.com
7

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