IOM - BALL CHECK VALVES, UNIWAT® 3240/3141
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VE SYSTEMS
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chnical Dept. Ref. IOM-BALL
CHECK V
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T® 3240/3141 - Ed.16/07
Comeval V
alve Systems reserves the right to alter any technical data contained in this Manual without prior notice. Regularly u
pdated data on www
.comeval.es
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 (6DN).
- Upstream from a disruptive element leave at least a distance of 2DN.
- Aggressive environmental conditions may reduce the life span of the pro-
duct. Consider special construction/protective measures in such a case.
- Consider the interaction between the system and the equipment.
Foresee elements to absorb vibrations, pipe dilatations, guides, ancho-
ring 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
À
ow 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 & 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.
Page 4
ATTENTION!
- Before commissioning the valve, check the material, pressure, temperature, fl ow direction and other essential pa-
rameters. Always use the product within the scope of intended service and operating duties.
- Before commissioning, make sure previous chapters have been thoroughly followed.
- Regional safety instructions should be adhered to.
- It is essential to fl ush 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 counterfl anges or at closing may also cause scalding, health harm,
pollution, fi re 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 modifi cation, 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 fi lling, 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!
Flanged ends valves:
- Make sure that counterfl anges are compatible with the standard of the valve fl anges. When matching up fl anges,
avoid gradients, rotation and pipe misalignment that could cause pipe and valve stress and leakage once installed.
Flanges should fi t smoothly. Select the proper fl ange face gaskets according to duty and centre them on the fl ange
face properly. Do not force the counterfl anges and do not try to tighten the bolts when a gap exists between valve and
pipe or if misalignment is observed. Tighten in a crosswise, moderate and uniform manner.
Threaded ends valves:
- Make sure that the pipe screw has the correct fi nish and compatible cone for the valve.
- Use proper sealant according to duty, such as hemp core, Tefl on, etc.
- Check that pipe introduction in the valve does not exceed its thread, leave a safety margin of minimum 1 mm.
- Tighten with a plain or adjustable wrench on the hexagon end of the valve only. Apply force to other area of valve
may seriously damage the valve. Do not use hook spanners or other wrenches that could damage the hexagon sur-
face. Valve should be threaded smoothly. If not, do not try to force the thread and avoid wrench extensions since this
could lead to breaking the valve or damaging the thread. A general recommendation is not to exceed the tightening
torque of 30Nm.
