Clarkson Manuals: Knifegate valves Figure 738 IOM smaller sizes, Clarkson-EN Manuals & Guides

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CLARKSON FIGURE 738 PNEUMATIC ACTUATOR

DN 50 - 200 MOUNTING INSTRUCTIONS

Mounting instructions for F738 pneumatic cylinder, DN 50 - 200 knife gate valves

GENERAL NOTES

A filter (5 micron), lubricator, regulator set is
recommended on incoming air lines and before
the valve. Where speed control is required, the
speed control valves should be fitted to control
the air exhausting from the cylinder (meter out
control).
These can be fitted in the lines adjacent to
thecylinder ports.
If the control lines are relatively short they
can be fitted to the exhaust ports of the
directional valve removed from the pipeline
anddisassembled (refer instructions).

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 clevis fastener (20).

3. Remove both bridge bolts (12).

4. Remove bridge assembly (6).

5. Remove handwheel and spindle assembly.

6. Remove port plugs from cylinder and
fully extend piston rod, either manually or
pneumatically.

7. Using 4 off capscrews provided, secure the
cylinder to the bridge.

8. Locate the bridge/cylinder assembly (6) on
to the pillars (7) and insert bridge bolts (12)
through bridge (6) and tighten.

9. Locate piston rod over the gate (2) and
insert clevis fastener (20) and secure.

10. Before operating valve, check alignment.
See overleaf.

11. 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.

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VCIOM-02595-EN 19/09

CLARKSON FIGURE 738 PNEUMATIC ACTUATOR

DN 50 - 200 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 front
and 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
(upstreamand 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.
Ifeither 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.
Heavycylinder 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 600stroke)
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
fordetails.

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
and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication arepresented 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
notice.

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