Critical valves repair

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