Edwards C411-01-000, Инструкция по эксплуатации

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C411-02-880 Issue J
Page 20 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.4 Replace the valve-body and pad ‘O’ rings
Refer to Figure 7 for item numbers shown in brackets.
1. Dismantle the valve as described in Section 5.2 .
2. Remove the valve-body ‘O’ ring (10) from the valve-body and discard.
3. Inspect the ‘O’ ring groove and contact surfaces. Refinish any surfaces which are damaged.
4. Fit the new valve-body ‘O’ ring (10) to the valve-body.
5. Remove the bellows/pole-piece assembly (7).
6. Remove and discard the valve-pad ‘O’ ring (12) from the bellows/pole-piece assembly.
7. Inspect the ‘O’ ring groove and contact surfaces. Refinish any surfaces which are damaged.
8. Fit the new valve-pad ‘O’ ring to the bellows/pole-piece assembly; apply a light wipe of high vacuum grease to
ease the fit.
9. Refit the bellows/pole-piece assembly and reassemble the valve as described in Section 5.2 .
5.5 Fault finding
Table 4 - Fault finding
Symptom Check Action
The valve fails to operate.
Has the electrical supply failed? Check the electrical supply and
repair as necessary.
Is there a loose connection in the
electrical supply socket? Remove the electrical supply socket,
check the electrical supply cable to
socket connections and repair as
necessary (see
Section 3.3.1 ).
Is the valve obstructed? Dismantle the valve (see Section 5.2 )
and remove the obstruction.
Incorrect position indication.
Is there a loose connection in the
position indication socket? Remove the socket, check the cable
to socket connections and repair as
necessary (see
Section 3.3.1 ).
Is the electrical supply voltage low? Change the electrical supply
(see
Section 4.2 ).
Is the valve obstructed? Dismantle the valve (see Section 5.2 )
and remove the obstruction.
The valve leaks
Is the valve-body ‘O’ ring or seating
groove damaged? Dismantle the valve and check the
‘O’ ring and seating groove
(see
Section 5.2 ).
Refinish and/or replace as necessary.
Is the valve-pad ‘O’ ring or seating
groove damaged? Dismantle the valve and check the
‘O’ ring and seating groove
(see
Section 5.2 ).
Refinish and/or replace as necessary.
Is there a bellows leak? Replace the bellows/pole-piece
assembly (see
Section 5.3 ).