26
DEPA
®
Air Operated Diaphragm Pumps
Always wear protective clothing
when working with solvents
and/or cleansing agents.
Pumps for use in explosion
hazard areas must always be
kept clean of dust deposits.
The following is generally valid:
The pump should preferably be cleaned
mechanically instead of using chemical
means. When using chemical cleansers, the
compatibility with the pumped product must
be assured..
5.3
Dismantling and assembling
Danger! Before disassembly the
pump must be disconnected
from the compressed air supply
and removed from the system.
General
In case of damage on the pump you may
perform the following work to replace the
damaged assemblies and parts. Please
bear in mind that the manufacturer or the
authorized dealer will only accept possible
warranty claims if the pump is returned
without being opened.
Note: For repairs use only
genuine DEPA spare parts, as
otherwise the warranty will
become null and void.
5.3.1 Series DL, DP, DZ, DF, DB,
DH-PT/TL
5.3.1.1 Replacement of diaphragms,
valve seats and valve balls
Depending on the application, air operated
diaphragm pumps can be delivered with
various elastomer materials. The following
materials are available:
5.0 Maintenance
5.1
Inspection periods
■
Visual inspection every week.
■
Depending on type and/or duration of
use disassembly and renewal of wear
items every 4 weeks to 6 months.
■
Since PTFE deforms under pressure,
the following pumps must be checked
for leakage at regular intervals and the
screw connections must be retightened
as necessary (For tightening torques,
see Page 45 ff):
5.2
Cleaning
Danger!
Always observe the notes on
safety in chapter 2 “Safety”.
Check all lines and fittings regularly for leaks
and externally visible damage! Repair any
damage immediately!
Danger!
Before working with the pump,
the pump must be moved from
a possible ATEX area to a work
area.
No work on the pumps in the
ATEX area!
If the pump is used for
aggressive, caustic or toxic
product, the pump must
generally be flushed with a
neutral agent before opening the
pump housing.
Type
Inspections
interval
Srew joint
PM with PTFE
Valve seats
weekly
Annchor rod,
Clamp band
DH-TP/TPL
monthly
Socket / Pump
chamber
