Cepex PVC-U Manuel D'installation Et D'entretien page 10

7. OPERATION AND MAINTENANCE INSTRUCTIONS
If the valve is installed correctly pointing in the direction of flow marked on the body, it is possible to carry out the maintenance
downstream without any problems. By simply closing the valve this acts as a plug. If on the contrary maintenance is required ups-
tream, it is essential that there is no pressure in the circuit when dismantling the union nut and end connector.
The operations described below should always be carried out without any fluid in the line.
The valve is adjusted in the factory for correct and prolonged operation. Nevertheless, the tightening of the sealing gasket on the
ball can be readjusted when the conditions of use so require it.
This operation should be carried out with the help of the tool provided (Fig. 18.1).
Dismantle the valve's union nuts (3) and remove them from their housing. Put the tool into the slot that is found in the seal carriers
for this purpose (12) and turn the key anti-clockwise to tighten the o-ring and clockwise to loosen it. If any of the components of
the valve wear out, they can be replaced by dismantling the valve's body. To do so, proceed in the same way as with the adjustment
but turn it clockwise until the seal carriers (12) are released. When this has been done any of the body's O-rings may be replaced.
Turn the shaft until the ball is in a closed position; remove the ball (2) and remove the ball seats (9).
To replace the shaft, this must be forced as shown in Fig.16. Once the shaft has been removed (1) the o-rings can be replaced (7).
Remember that excessive force on the seal carriers can affect the action which can damage the actual functioning of the valve.
Assembly can be done by reversing the process but always taking the precaution of lubricating the o-rings with PTFE oil. Do not use
grease or mineral oils that may attack the material of the o-rings.
12
Fig. 12
8. MOUNT AND DISMANTLE THE ACTUATOR
If the actuator or the valve needs to be replaced, proceed as follows:
1. Move the ball valve to the closed position.
2. Depressurise and drain the plant or the plant component.
3. Depressurise the control medium.
4. Remove the control medium line(s) from the actuator.
5. Remove the screws (B, Fig. 19).
6. Separate the pneumatic actuator (4) with the mounting clamp (2) from the bare shaft
valve (Fig. 19).
7. Remove the screws (A) in order to dismantle the actuator from the mounting clamp.
8. In the case that the actuator needs to be replaced by a handle, also remove the
coupling bush (3, Fig.19).
In order to assemble a new actuator or a new valve, proceed in opposite direction to the
description above.
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EXTREME PNEUMATIC BALL VALVE
8
6 9
10
Fig. 13
Fig. 18
4
9
2
Fig. 18.1
ENGLISH
Fig. 14 Fig. 15
1
Fig. 17
Fig. 16
Fig. 19
7