KEYSTONE OPERATING AND SAFETY INSTRUCTIONS
CheCk ValVes
Before installation, these instructions must be fully read and understood
PRECAUTIONS
WARNING
For safety reasons, it is important to take the
following precautions before you start work on
the valve:
1. Personnel making any adjustments to the
valves should utilize suitable equipment. All
required personal protection means should be
worn.
2. The line must be depressurized before
installing the valve. In case of dangerous
pipeline fluids, the pipeline should be drained
and flushed properly with an appropriate
cleaning fluid.
3. Personnel trained in all aspects of manual and
mechanical handling techniques must carry
out handling of all valves.
4. Misuse of the valve is not allowed. For
example: the valve, handles, actuators or other
Hazard potentials
• disregarding of instructions
• improper use of product
• insufficiently qualified personnel
Ensure that valve materials are compatible with
the pipeline fluid.
Valve application to be within the pressure/
temperature limits indicated in the P/T diagram
of the Product Manual.
parts may not be used as “climbing tools”.
5. Ensure the valve pressure/temperature
specification as indicated on the identification
label, is within the pressure/temperature
limits of the application. A full pressure/
temperature diagram can be obtained from
the Product Manual. With the use of the figure
and trim number on the valve’s identification
label, the correct diagram can be found.
6. Ensure that valve materials are compatible
with the pipeline fluid.
If in doubt contact factory.
Check the valve’s functionality on a regular
basis.
When the valve is used in an end-of-line
function, PED Cat-I applications are allowed
only. For other categories, contact factory.
www.valves.emerson.com © 2017 Emerson. All rights reserved.
7 m o
VCOSI-00762-EN 15/06
KEYSTONE OPERATING AND SAFETY INSTRUCTIONS
CheCk ValVes
INSTALLATION
1. Handling and lifting should be performed
according the Maintenance & Installation
Instructions.
2. Keystone valves are bi-directional unless
fitted with a Flow Direction Arrow. If a
directional arrow is fitted then the valve
must be installed with the arrow pointing in
the direction of the flow.
3. For detailed installation instructions refer to
the Installation & Maintenance Instructions
for the specific product.
4. Check valves have to be mounted in
horizontal pipelines with hinge point on
topside. SeeInstallation & Maintenance
Instructions for alternative pipeline
directions.
5. Do not use the valve to spread the flanges.
6. Do not use flange gaskets.
7. In case the valve is used as spool piece
during erection of piping, do not finish weld
the flanges to the pipes with the valve bolted
between the flanges as this will result in
serious heat-damage to the seat.
8. Valve operation should be checked for
open - close positions. The disc should have
enough clearance from the pipeline in all
positions.
MAINTENANCE
!! Read all warning labels fitted to the valve
before operation or maintenance !!
Check the valve’s functionality on a regular
basis.
No additional routine maintenance is required.
REPAIR
WARNING
The line must be depressurized before carrying
out any repairs to the valve. In case of dangerous
pipeline fluids, the pipeline should be drained and
flushed with an appropriate cleaning fluid. Failure
to do so may cause serious personal injury and/
or equipment damage. Before disassembling the
valve ensure the valve has been decontaminated
correctly from any harmful gasses or liquids
and that it is within a safe temperature range for
handling. Personnel making any adjustments
to the valves should utilize suitable equipment.
All required personal protection means should
be worn. Only qualified personnel trained in all
aspects of manual and mechanical handling
techniques must carry out lifting and handling of
valves.
Use Keystone original spare parts only. For
detailed information on valve (dis)assembly and
part replacement, refer to the Maintenance &
Installation Instructions.
TAGPLATE
Year of construction/
JOB number
Temperature
Product
designation
Nominal diameter
Body material of construction
Trim number
Mass
Max. permissible
working pressure
Flange
compatibility
(drilling)
© 2017 Emerson. All rights reserved.
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