BUCHI DuMaster D-480 - Manual (Page 202)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 202
Process
The section is divided into the following phases:
 Cleaning the half shells and ball
 Assembling the ball valve
 Mounting the ball balve
 Preparing the Instrument for measurements
Requirements
Before starting work, the following requirements must be met:
 Keep the following tools ready:
 Hook wrench
 Phillips screwdriver / Allen wrench 3 mm
 8 mm open jaw wrench.
 Keep acetone ready to clean components.
 The ball valve must have been removed.
 The instrument must have cooled down and be disconnected from the mains when you install the
ball valve again. See step 1 in Removing and dismantling the ball valve (on page 197).
Safety instruction
Strictly observe the safety instruction "Hot instrument parts" under Warning notes during operation
(on page 24).
Dismantled ball valve
The following picture shows the disassembled ball valve:
Legend:
1 Wheel flange of the half shells
2 Top and bottom half shell
3 Ball
4 Screws
5 Drive bearing
6 Holder plate
7 O-ring
8 Bayonet catch
Phase 1: Cleaning the half shells and ball
Proceed as follows:
 Clean the half shells (2) and the ball (3) with acetone.
 Check the half shells (2) for grooves. If there are any grooves, replace the half shells.
 Check the ball (3) for grooves. If there are any grooves, replace the ball.