IOM - DOUBLE ECCENTRIC BUTTERFLY VALVES
UNIWAT® VF791
©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - DOUBLE ECCENTRIC BUTTERFL
Y V
AL
VES, UNIW
AT® VF791 - 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
1. GENERAL INFORMATION ON THE MANUAL
- This Manual provides information on safely using the product, being binding for preservation, storage, handling, transport,
installation, commissioning, operation, maintenance, repair and disposal, and must be thoroughly observed at any step.
- Please contact the supplier or the manufacturer in case of issues which cannot be solved by reference to this Manual.
- Any deviation from this Manual and sound engineering practice or modification on the product shall be notified to manu
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facturer for advice or approval.
- In addition, regional safety requirements must be always applied and observed at any step.
- All the work related to the product must be carried out, supervised and inspected by specialist personnel. It is the owner’s
responsibility to define areas of responsibility and competence and to ensure the proper monitoring.
- This Manual is in accordance with Directive 2014/68/EU on Pressure Equipment (PED) and Machinery Directive 2006/42/EC.
- For ATEX applications, please refer to ATEX Specific instructions.
- The manufacturer reserves the right to make technical modifications at any time.
2. NOTES ON POSSIBLE DANGERS
2.1 Significance of symbols
ATTENTION!
. . . Warning of general danger.
2.2 Explanatory notes on safety information
In this Manual dangers, risks and items of safety information are highlighted to attract special attention.
Information marked with the symbol above describes practices, which if fail to comply with, can result in serious injury or
danger of death for users or third parties or in material damage to the system or the environment. It is vital to comply with
these practices and to monitor compliance.
The rest of information not specifically emphasized in this Manual, along with Data Sheet and product marking, must also
be observed and complied with for safely using the product.
3. PRESERVATION, STORAGE, HANDLING AND TRANSPORT
ATTENTION!
- Use proper packing for transportation.
- Keep storage protection before installation.
- Keep the valves in a slightly open position and with the sealing unstressed.
- Valves are protected with epoxy paint protection. In order to prevent damage, corrosion or rust on the surface, avoid ex
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treme temperatures (keep at 5ºC to 50ºC), avoid high environmental humidity or corrosive environment. Keep the valves
away from direct sunlight, dust, flames or rain. Protect rubbers also against UV light. Do not pile up excessive weight. In
case of severe bumping inspect the material for any damage and replace if necessary.
4. DESCRIPTION
4.1 General Description / Operating principles
Butterfly valves VF791 are quarter turn rotary valves, with preferred flow direction. The closure is carried out by turning the
handwheel or actuator clockwise, that rotates a stem 90º in conjunction with the disc with elastomeric seal, placed in the
interior of the valve body. See visual position indicator of gear or actuator to check position of the valve. The first offset mo
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ves back the disc rotation axis from the disc sealing surfaces. This allows having a continuous sealing surface on the disc.
The second offset moves away the disc rotation axis from the center-line of the valve body which reduces the interference
at closing. Consult the manufacturer if a change of the actuation device is required.
Valve diagram with parts can be seen at the last page of the Manual.
Page 2
- Protect against external force (impacts, vibrations, etc.).
- Allow only skilled personnel; suitable handling and lifting equipment must be
used. See Data Sheet for weights or consult manufacturer.
- Always use suitable protection equipment, and minimize the use of human
body force at any step to avoid injuries.
- During handling make sure that operating device is well attached to the valve
or removed to avoid danger of detachment. Product parts such as hand levers,
handwheels or actuators must not be used to take up external forces that they
are not designed for: e.g. do not use them as climbing aids, or as connecting points for lifting gear, etc.
Valves have
lugs to ease their lifting.
- There is a risk of body member (hand, finger, arm…) crushed against any other solid element (wall, pipe, floor, etc.)
during handling. Take this into account and handle with care.
- There is a risk of body member trapped between valve body and disc during operation of the valve. Make sure no
operation / supply to actuator disconnected if access to the interior of the valve.
- There is a risk of body member injury in case there is any exposed moving part between valve and actuator (special
arrangements). Take appropriate measures and set warning notes when required.
- Check correct position of nameplate and handle with care to avoid personnel cuttings.
Lug
