Bardiani Valvole BBZM Instruction, Use And Maintenance Manual page 17

8 General maintenance
2. CLEANING AWAY DEPOSITS:
- Thoroughly wash and clean all the valve parts before disassembly;
- Pay attention to any possible detergent or other aggressive fluid
deposits (see "Cleaning");
- Always use protective safety glasses and gloves when required.
3. REPLACEMENT OF WORN VALVE PARTS:
Always use original spare parts
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EN-IST-BBZM-0420