Valve repairing includes stop valves and non-return valves and control valves
The repairing specifications include standard and extra activities:
Standard repair consist in the following steps:
- Actuator disassembly
- Bonnet and gland disassembly
- Cleaning and examination of the state of the internal parts and the stem
- Check of actuator efficiency
- Lapping of the seats
- Grinding of the plug or replacing it with a new part
- Polishing of the stem or its replacement with a new part
- Various parts and re-assembling
- Functional testing
- Seal testing
- Repainting with paint suitable for high temperature
- Attack recovery
During the repairing, the following extra activities may be necessary, which must in any case be authorized by the Customer:
EXTRA WORK
- Replacement of seats
- Welding coatings on the seats and consequent machining (not to be carried out on site)
- Welding coatings on the plug and consequent machining
- Reconstruction of spare parts with reverse engineering
- Body/bonnet seal repairing
List of equipment:
LAPPING MACHINE UP TO 12"
LAPPING MACHINE FROM 8" TO 32"
GRINDING machine UP TO 24
Reverse engineering
The construction of spare parts is a consolidated practice in cases of urgency and immediate unavailability by the manufacturer when plant downtime emergencies do not allow a scheduled supply
