Detection Of Seal Damage - SPX APV DELTA DF plus 2 Operating Manual

Double seat valve

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Table Of Contents

Table of Contents

DELTA DFplus2 - UK1 / qxd.12.2004

Failure

V a l v e c l o s e d a n d p r e s s u r e i n u p p e r h o u s i n g

Leakage between housing and

yoke flange

Leakage at the upper valve shaft

in the yoke area

Leakage from the leakage chamber of the

lower valve shaft

Leakage from the leakage bore

V a l v e c l o s e d a n d p r e s s u r e i n l o w e r h o u s i n g

Leakage between housing and

housing cover (1)

Leakage at the outside surface of the

lower valve shaft

Leakage from the leakage chamber of the

lower valve shaft

Leakage from the leakage bore

V a l v e o p e n

Leakage from the leakage chamber of the

lower valve shaft

Leakage from the leakage bore

A c t u a t o r

Air escapes from the actuator rod

Actuator does not work (air escapes

permanently from the venting plug)

V a l v e f e e d b a c k

Feedback is missing

Double Seat Valve

DELTA DFplus2

Operating Manual: rev. 1

14.