©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 2
IOM - DUAL PLATE CHECK VALVES AND DISC
UNIFLOW DC/DP
1. GENERAL INFORMATION ON THE MANUAL
- This Manual provides information on safely using the product, being binding for preservation, storage, handling, trans
-
port, 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 ma
-
nufacturer 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).
- 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 AND TRANSPORT
ATTENTION!
- 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.
- 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 crushing hazard between the plates (or discs) and the seat. Ensure the plates are in rest position in case
a hand is introduced inside the valve.
- Check correct position of nameplate and handle with care to avoid personnel cuttings.
- Use proper packing for transportation.
- Keep storage protection before installation.
- Keep exposed machined surfaces cleaned and greased when necessary.
In order to prevent damage, corrosion or
rust on the surface, avoid extreme 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
Dual Plate Check Valves
use two half-sphere discs or plates and a connecting hinge to create a closure element that
collapses when positive flow exists, and folds back to a full circular disc and close against a pressure reversal. Discs are
preloaded with springs that favor the closing of the valve when no positive flow.
Valve diagram with parts can be seen at the last page of the Manual.
4.2 Area of Application
Dual Plate Check Valves are featured as a light, compact and economic anti-return device to be used on industrial and
waste treatment plants. Its wafer or lug design suitable to installation between flanges makes these valves quite a prime
option especially on large sizes.
4.3 Technical data – remarks
For data such as main features, duties/limits of use, dimensions, weights, etc. refer also to Data Sheet.
