16
9/28/2017
Bradley •
215-1595 Rev. E; ECN 17-00-014
S93-572, S93-573, S93-574
Installation
Troubleshooting – Metering Air Valve
Problem
Cause
Solution
Valve will not
shut off .
Timing mechanism is
clogged .
Clean and inspect timing mechanism:
1 . If compressed air is available, blow water and debris from timer cover of timing
mechanism .
2 . Turn adjusting screw out all the way . Clean and inspect screw and valve body .
3 . Turn adjusting screw in to desired cycle time .
Valve will not
turn on .
Water is not being
supplied to unit .
Open all stops on mixing valve .
Water pressure is
over 80 PSI .
Install a pressure reducing valve .
Failed diaphragm/
magnet assembly .
Unscrew the valve clamp nut on valve . Remove valve cover . Gently press the diaphragm .
The valve should activate . If not, replace the diaphragm/magnet assembly .
Timing can not
be adjusted for
more than 5
seconds .
There is an air leak .
Check the valve assembly:
1 . Check all tubing and fittings for proper assembly .
2 . Tighten cap and nut on 1/8" tubing .
Pushbutton
does not work
properly .
Air volume may
not be sufficient to
operate valve .
Check for leaks and lubricate U-cup:
1 . Check all fittings for air leaks .
2 . Disassemble pushbutton and lubricate U-cup seal (see pushbutton assembly
diagram) .
Water is
dripping
from the
streamformers .
Debris has
accumulated on
valve seat or orifices .
Clean and inspect valve seat:
1 . Remove screws and disassemble metering valve .
2 . Clean valve seat and inspect for deep gouges or scratches . Replace valve body if
necessary .
3 . Remove any debris clogging off-center hole in rubber diaphragm .
1
2
14
13
12
10
11
15
13
5
4
3
9
7
8
6
Item
Qty.
Description
1
1
Diaphragm
2
1
Armature
3
1
Spring
4
1
AST 4 Valve Upper Body
5
1
Spring
6
1
Magnet/Diaphragm Assembly
7
1
AST 4 Valve Cover
8
1
AST 4 Valve Clamp Nut
9
1
AST 4 Valve Timer Assembly
10
2
O-Ring
11
1
AST 4 Valve Timer Cover
12
3
Screw, #8 x 7/8"
13
1
Compression Nut, 1/8" Tube
14
1
Compression Nut, 1/4" Tube
15
1
O-Ring
Turn off water supplies to the unit before troubleshooting.
