©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - DUAL
PLA
TE CHECK V
AL
VES, UNIFLOW DC/DP
- Ed.20/07
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
Page 4
IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
5.2 Requirements at the place of installation
- Downstream from a disruptive element (pump, valve, elbow, pipe reduction) leave as much distance as possible; mini
-
mum distance recommended: 6 times the valve diameter (6xDN).
- Upstream from a disruptive element leave at least a distance of 2xDN.
- Aggressive environmental conditions may reduce the life span of the product. Consider special construction/protective
measures in such a case.
- 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. 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 seat leakage.
- Planners / construction companies or the owner are responsible for positioning and installing products.
6. COMMISSIONING
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 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!
- Ensure valve surface is in good condition and retouch coating protection when needed.
- 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.
7. CARE AND MAINTENANCE
The operator must define maintenance and maintenance-intervals to meet requirements.
- Check for body and seat tightness and valve correct operation.
ATTENTION!
- Before disassembling the valve, note chapters 8 & 9.
- 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.
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.
