9
8.
Maintenance
-
The maintenance intervals depend on the application and should
be determined by the operator carrying out temporary checks.
-
The valve must not be cleaned with products containing abrasive
or polishing substances. Especially the valve shafts must not be
cleaned with such agents under any circumstances. Damage at
the valve shaft can produce leakages.
-
Replacement of seals according to Service Instructions.
The customer is recommended to hold spare seals on stock.
For valve maintenance APV supplies complete seal kits including
seal grease (pl. see spare parts lists).
-
Tools required:
1 x spanner SW13
1 x spanner SW17
1 x spanner SW19
1 x spanner SW30
1 x strap wrench
-
Cleaning rag as well as low solution of a suitable cleaning agent
(observe safety data sheets of cleaning agent manufacturer)
-
Slightly grease all seals before their installation !!!!!
Recommendation:
APV food-grade-grease for EPDM, HNBR, FPM and NBR
(0,75 kg/tin - ref.-No. 000 70-01-019/93)
(60 g/tube - ref.-No. 000 70-01-018/93)
or
APV food-grade-grease for VMQ
(0,6 kg/tin - ref.-No. 000 70-01-017/93)
(60 g/tube - ref.-No. 000 70-01-016/93)
!
Do not use grease basing on mineral oil for EPDM seals!
!
Do not use grease basing on Silicone for VMQ seals!
Recommendation for screw retention
Type:
Loctite 243 semi-solid
(5 ml
- ref.-No. 00070-01-110/93)
(50 ml - ref.-No. 00070-01-111/93)
UK
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
