IOM - SLEEVED PLUG VALVES, UNIFLOW PP
©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - SLEEVED PLUG V
AL
VES, UNIFLOW PP
- Ed.16/05
Comeval V
alve Systems reserves the right to alter any technical data contained in this Manual without prior notice. Regularly updated data on www
.comeval.es
5.2 Assembling additional modules
Optional accessories (limit switches, extensions, etc.) that are supplied with valves must be fitted as required for their
functions as shown in the system plan.
5.3 Requirements at the place of installation
- Aggressive environmental conditions may reduce the life span of the product.
- Consider the interaction between the system and the equipment. Foresee elements to absorb vibrations, pipe dilata-
tions, guides, anchoring and proper support according to the weight of the components.
- The system and operation protocol should be conceived in such a way to avoid high velocities and cavitation. Prevent
pulsing flow or water hammers, which are very harmful for valves and the rest of the components.
- Flooding of the product is not recommended.
- Allow enough space for valve installation, operation and maintenance.
- It is recommended to install a proper sized mesh strainer upstream the valve in order to protect seating surfaces from
abrasion or erosion that could lead to leakage.
- Planners / construction companies or the owner are responsible for positioning and installing products.
6. – COMMISSIONING
- Ensure valve surface is in good condition and retouch coating protection if any when needed.
- Valve operation, filling, warming-up and starting-up shall be gradual so as to avoid any inadmissible stress. Check for
tightness in valve connections, body/cover union, and stem, and retighten crosswise and gradually if necessary until
leakage elimination. When tightening gland packing make sure that operating torque is not significantly affected by over
tightening. If leakage persists surfaces should be thoroughly cleaned and new gaskets or packing rings correctly placed.
- Packing gland is tightened at factory in a moderate way to pass the pressure tests. After a while before installation, pac
-
king rings experiment a relaxation and some retighten of the gland could be needed during start-up. Over tightening will
increase operating torque and will reduce life of the packing. Also after several open and close manoeuvres of the valve
the stem gains some play with the packing rings, thus packing tightness should be checked periodically and retighten
gradually when necessary.
- Once the valve installed, make an initial opening and closing operation to check its proper operability.
7. – CARE AND MAINTENANCE
The operator must define maintenance and maintenance-intervals to meet requirements.
- Check for body and seat tightness and valve smooth operation without additional tools.
ATTENTION!
- Before commissioning the valve, check the material, pressure, temperature and other essential parameters.
Always use the product within the scope of intended service and operating duties.
- Before commissioning, make sure above chapters have been throughly followed.
- It is essential to flush the pipe system thoroughly to eliminate all the particles and impurities which could remain in
the pipes and particularly welding residue, chips, tool remains, etc. that could damage the equipment during start-
up. Ensure that during cleaning of the pipe system, any chemicals used and temperature are compatible with the
valve construction.
- Regional safety instructions should be adhered to.
- Temperatures above 50ºC or below 0ºC may cause personnel injuries if valves are touched. Ensure that the
corresponding warning signs are displayed on the valve or surrounding area, or isolate the equipment in case of
danger.
- Before commissioning a new plant or restarting it after repairs or modification, always ensure that:
- All work has been completed correctly!
- The valve is in the correct position for its function.
- Safety devices have been attached!
Page 4
ATTENTION!
- In the event of infrequent use, operate the valve as frequently as possible to avoid deposits of dirt and valve
blocking.
- When using the valve as an end seal, the employers’ liability insurance association of the gas and waterworks
specifies the use of a safety precaution such as a plug-in disc, blind flange, etc. (observe the information in EN
13857). With a medium jet that freely exists, you must secure the exit area.
- Before disassembling the valve, note chapters 10 & 11.
