Evoqua WALLACE & TIERNAN DEPOLOX 400 M, Operating Manual, Page: 114 / 152

114
WT.050.700.000.DE.IM.0319
Maintenance
DEPOLOX
®
400 M
7.
7.5 Cleaning the flow rate monitor and check valve
Proceed as follows:
1 Close the ball valves on the sample water supply and drainage line.
2 Remove the housing cover of the flow cell module.
3 Release both knurled nuts. Take out the filter unit toward the front.
4 Carefully pull the complete check valve housing (A) down and out.
5 Turn the check valve housing upside down and catch the flow ball
(C) or if the ball is jammed, release it with a slight knock.
6 Now use a suitable blunt tool to push out the ball seat (D) and glass
ball (E) against the direction of flow.
7 Clean the empty check valve housing, flow ball, ball seat and glass
ball with clear water.
8 During reassembly, make sure that the ball seat and ball are cor
-
rectly positioned.
9 To help push the assembled check valve housing back into the con
-
trol valve, we recommend slightly lubricating the gaskets with the
Unisilikon grease provided.
10 Check that the check valve housing is correctly positioned by the
guide lugs on the housing.
11 Fit the filter unit again. To do this, tighten the knurled nuts.
12 Fit and engage the housing cover of the flow cell module.
13 Open the ball valves on the sample water supply and drainage line
again.
Image 1 Section, flow cell module DEPOLOX
®
5 C
Image 2 Cutaway model, filter unit
A Check valve housing (overall view)
B Filter unit
C Flow ball
D Ball seat
E Glass ball
top
bottom
D
E
C
A