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www.cmovalves.com
KNIFE GATE VALVE - SERIE UB
Rev .00 / 19-04-2021
To operate the valve: Turn the handwheel clockwise to close or anticlockwise to open.
To operate the valve pull one of the chain’s vertical drops, taking into account that sealing is carried out when the chainwheel
turns clockwise.
First loosen the position locking clamp located on the yoke. Once it is unlocked, raise the lever to open it or lower to close it. To
complete the operation lock the lever again.
CMO pneumatic actuators are designed to be connected to a pneumatic grid of between 6 kg/cm² and 10 kg/cm².
The pressurised air used for the pneumatic actuator must be correctly dried, filtered and lubricated.
This type of actuator does not require any adjustment, due to the fact that the pneumatic cylinder is designed for the exact
stroke required by the valve.
CMO hydraulic actuators are designed to work at a standard pressure of 135 kg/cm² (other pressures can be used in accordance
with needs).
This type of actuator does not require any adjustment, due to the fact that the hydraulic cylinder is designed for the exact stroke
required by the valve.
If the valve incorporates a motorised actuator it will be accompanied with the electric actuator supplier’s instructions.
Positions 1, 2 and 3: In these positions, it is recommended to
make a suitable support, since, due to the weight of the actuator,
deformations may arise and this can lead to operating problems in
the valve.
Once the valve has been installed, check that all the screws and
nuts have been correctly tightened and that the whole valve
action system has been correctly adjusted (electrical connections,
pneumatic connections, instruments, etc).
All CMO valves are tested on site, although it is possible that the
stung box screws (in valves from DN50 to DN600) or the packing
nuts (in valves over DN600) may come loose during handling and
need to be retightened.
Once the valve is installed in the pipe and has been pressurised, it is
very important to check whether there is any leakage in the stung
box area (upper part of the body in valves from DN50 to DN600) or
the packing area (in valves over DN600).
In the event of a leakage, retighten the packing gland nuts or stung
box screws until the leakage stops, ensuring that there is no contact
between the packing gland and the through conduit.
A very high tightening torque on the packing gland nuts or stung
box screws can lead to problems, such as an increase in the torque
required to drive the valve, a reduction in the working life of the
gasket or stung box seal, or the breaking of the packing gland.
ASSEMBLY POSITIONS (vertical/leaning pipe)
HANDWHEEL (rising stem, non-rising stem and with gear box)
CHAINWHEEL
LEVER
PNEUMATIC
HYDRAULIC (double and single acting)
MOTORIZADO (husillo ascendente, no ascendente)
ACTUATOR
fig. 5
Once the valve is installed in place, check that the flanges and electrical and pneumatic connections are secure. If the valve has
electrical accessories or you are in an ATEX zone, earth connections must be made before operating it.
If you are in an ATEX zone, check the continuity between the valve and the pipe (EN 12266-2, annex B, points B.2.2.2. Ind B.2.3.1.).
Check the pipeline’s earth connection and the conductivity between the outlet and inlet pipelines.