IOM - WAFER DUAL PLATE CHECK VALVES, UNIWAT® CH
©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - W
AFER DUAL
PLA
TE CHECK V
AL
VES, UNIW
AT® CH - Ed.20/06
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
- 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 seat leakage.
- Planners / construction companies or the owner are responsible for positioning and installing products.
6. COMMISSIONING & OPERATION
- Ensure valve surface is in good condition and retouch coating protection when needed.
- In case of risk of media freezing inside the valve, take due measures to avoid it.
7. CARE AND MAINTENANCE
The operator must define maintenance and maintenance-intervals to meet requirements.
- Check for body, seat and connections tightness.
After any maintenance work please refer to chapters 5 and 6 for installation / commissioning.
Recommended Spare parts:
Use only original spare parts.
Type and number of each spare part to be stored according to many factors: service level, valves quantity, etc. In many
cases a good choice is to keep complete valves as spare part.
8. DISMANTLING THE VALVE
Page 4
ATTENTION!
- Before commissioning the valve, check the material, pressure, temperature, flow direction and other essential
parameters. Always use the product within the scope of intended service and operating duties.
- Before commissioning, make sure previous chapters are thoroughly followed.
- Regional safety instructions should be adhered to.
- 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.
- Temperatures above 50ºC or below 0ºC may cause personnel injuries if valves are touched.
- Leakage of media through valve, between counterflanges or at closing may also cause scalding, health harm,
pollution, fire or damage to other parts of the installation depending on the media.
Use suitable protection equipment when approaching the valve, ensure that the corresponding warning signs are
displayed on the valve or surrounding area, and/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/measures have been implemented
- The filling, warming-up and starting-up of the system shall be gradual so as to avoid any inadmissible stress. Check
for tightness in valve connections and retighten crosswise and gradually if necessary until leakage elimination.
ATTENTION!
- Before disassembling the valve, note chapters 3, 8 & 10.
- There is a crushing hazard between the plates and the seat. Ensure the plates are in rest position in case
a hand is introduced inside the valve.
- Check the valve surface inside and outside
and retouch coating protection when needed. If advanced
corrosion or erosion is observed, double check service and valve features and replace the valve properly.
ATTENTION!
The following points must be observed:
- Pressureless pipe system.
- Medium must be cool.
- Plant must be drained.
- Note chapter 3 for proper handling and lifting.
- Additionally, in case of toxic, corrosive, flammable or caustic media:
- Purge pipe system carefully.
- Use proper protection equipment to avoid health harm.
- Adopt proper actions to avoid pollution of the environment.
