Clarkson Manuals: Knifegate valves Figure 738 IOM larger sizes, Clarkson-EN Manuals & Guides
CLARKSON FIGURE 738 PNEUMATIC ACTUATOR
DN 250 - 600 MOUNTING INSTRUCTIONS
Mounting instructions for F738 pneumatic cylinder,
DN 250 - 600 knife gate valves
GENERAL NOTES
1. A filter (5 micron), lubricator, regulator set
is recommended on incoming air lines and
fitted before the valve, particularly on large
cylinders (DN 250 - NPS 10 bore and above)
which are made of glass epoxy composite
tube.
2. Where speed control is required, the speed
control valves should be fitted to control the
air exhausting from the cylinder (meterout
control). These can be fitted in the lines
adjacent to the cylinder ports. If the control
lines are relatively short the can be fitted to
the exhaust ports of the directional valve.
CAUTION
Some combinations of knife gate valves and
pneumatic cylinders are only suitable for operation
at low air line pressures and pipe line pressures.
Do not exceed operating conditions on valve and
cylinder tags otherwise damage may occur.
MOUNTING INSTRUCTIONS
1. Ensure pipeline is not pressurized and any
hazardous medium is drained away.
2. Remove bridge nuts (26) and washers (22).
3. Remove pillar nut and washer.
4. Loosen upright mounting bolts (12) at valve
body.
5. Remove clevis retaining bolts and washers.
6. Remove handwheel, bridge and spindle
assembly.
7. Screw supplied cylinder mounting bridge
onto threaded pillar until it is nearly flush
with top of pillar (7).
8. Replace upright (23) and tighten mounting
bolts (26).
9. Remove four mounting nuts and washers
from the actuator. Locate pneumatic
cylinder on mounting bridge, ensuring air
ports are in the required position.
10. Replace cylinder mounting nuts and
washers, loosely.
11. Fit the clevis to the piston rod and adjust if
necessary to align with the gate.
12. Fit the clevis bolts (13) and tighten.
13. Check alignment of piston rod and gate (2),
then tighten mounting nuts.
14. Remove port plugs and fully extend piston
rod either manually or pneumatically.
15. Connect air supply to both ports.
16. Open and close valve to ensure it operates
correctly.
STORAGE
1. All air line and electrical cable entries
should be plugged. If cylinders are not fitted
to a valve, they should be stored with the
piston rod fully retracted.
2. Cylinders are assembled with a light coating
of grease on internal components.
26, 22
7
13
23
2
12
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CLARKSON FIGURE 738 PNEUMATIC ACTUATOR
DN 250 - 600 MOUNTING INSTRUCTIONS
ALIGNMENT
For correct valve operation, it is important that
the valve gate is correctly aligned and seating
in the valve, and that the cylinder stroking
movement is correctly aligned to the valve gate.
Prior to fitting cylinder, check:
Valve:
Check gate alignment (gate closed)
If correctly fitted and aligned:
• Height of pillars (7) to bridge bolts (12) should
be equal.
• Gate will be fitting firmly and evenly up
against seating face in valve body.
• Gate and gland box will be approximately
centerd with the valve body viewed from
frontand sides
• Gate will be true and parallel to valve body
axis viewed from the side.
• Gate will not have significant movement
when rocked backwards and forwards
(upstreamand downstream, not sideways)
If not fitted correctly:
• Gate is not seating properly into the wedges
in the base of the valve and/or the gate guides
in the upper body of the valve are badly
worn, missing or incorrectly adjusted - fix as
necessary.
Actuator:
After fitting cylinder to closed valve and before
stroking cylinder:
• With cylinder rod fully extended, viewing from
the side of the valve, check that the center
line of the cylinder and it’s extended rod are
directly in line with valve blade axis, the valve
body axis and the pillar supports. Then check
center line alignment of valve and cylinder
and rod viewing from the front of the valve.
Ifeither check reveals an out of alignment,
then cylinder is not mounted squarely onto
the valve and adjustment is necessary.
CYLINDER ACTUATED VALVES INSTALLATION GUIDELINES
Cylinder actuated valves tend to be large
and heavy and consideration must be given
to adequately supporting both the actuated
valve and adjoining pipe work particularly
where light weight pipe or tube is being used.
Heavycylinder actuated valves mounted in
other than the vertical position can also cause
the pipeline to twist.
Where possible, the cylinder actuated valves
should be mounted in the vertical position
with the cylinder uppermost to prevent gate
misalignment and possible structural damage
to the valve assembly.
If mounted in any other position
(angled,horizontal etc.), the cylinders must be
properly supported by a suitable structure.
Large valves using cylinders (not vertically
mounted) in size 14 (400 mm bore x 600stroke)
and above must have a fully engineered
structure.
Contact Emerson for advice or assistance.
NOTE:
To minimize risk to personnel, Emerson recommend
the use of purpose built guards and shrouds.
Refer to the Emerson data sheet or consult factory
fordetails.
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Clarkson is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
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The contents of this publication arepresented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
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