Troubleshootingt - Cepex STD Manual De Instalación Y Mantenimiento

ENGLISH
8.3 MOUNT AND DISMANTLE THE ACTUATOR
If the actuator or the valve needs to be replaced, proceed as follows (Fig. 12):
A) Move the butterfly valve to the closed position.
B) Remove the wires from the actuator.
C) Remove the screws, the washers and the nuts (C) from the mounting clamp attached to the valve using an allen key*.
D) Remove the actuator (2) with the mounting clamp (4) from the bare shaft valve (1).
E) Remove the screws (D) from the mounting clamp in order to dismantle the actuator (2) from the mounting clamp (4).
F) In case the actuator needs to be be replaced by a handle, also remove the coupling bush (3). Look at the Cepex spare parts
document to find the necessary components.
In order to assemble a new actuator or a new valve, proceed in the opposite direction to the description above.
* IMPORTANT: For valves D160 it will be necessary to use a short allen key, as the regular ones does not fit into the space.
9. TROUBLESHOOTING
FAULT
The disc does not fully open
or close.
Excessive opening or closing
torque.
The valve is not completely
watertight in the sockets.
The valve is not completely
watertight at the sealing
gasket.
The valve does not open or
close.
The valve does not close
completely.
STD ELECTRIC BUTTERFLY VALVE
Fig. 12
T 13
POSSIBLE CAUSE
The sockets were not correctly bevelled.
Foreign materials in the compartment (adhesive, etc.).
The valve has been inactive for a long time.
High temperatures or chemicals can cause damage to
the gasket.
Excessive flange torque.
Misalignment between sockets and valve.
Dirty, adhesive or strange elements in the gaskets or
flange adaptors
Misalignment between sockets and valve.
Flange screws not tight enough.
Inadequate chemical resistance.
Temperature out of range.
Excess pressure.
Abrasive elements.
Damaged gasket.
Lack of current.
The actuator stroke is not well adjusted to the valve.
The torque of the valve has increased above the
calculated value.
FAULT CLEARANCE
Disassemble the valve and bevel the sockets as indicated
in table T4.2.
Disassemble the valve and check for obstructions in the
disc and gasket contact area.
Operate with an auxiliary release key (not the plastic
handle).
Disassemble the valve and lubricate the sealing gasket.
Check the chemical compatibility of the liquid with the
disc and the working temperature. Replace the gasket.
Tighten flanges as indicated in table T5.2.
Disassemble the valve and reassemble with concentric
alignment (observe the correct tightening sequence and
torque).
Clean carefully the dirty components
Disassemble the valve and reassemble with concentric
alignment (observe the correct tightening sequence and
torque).
Tighten flanges as indicated in table T5.2.
Check compliance with the specifications in this
document.
Replace the gasket.
Check power supply to the actuator.
Check adjustment limits according to the actuator manual.
Check the valve: obstructions in the disc or malfunction
of the valve.
11