CLA-VAL 39A User manual

39A
OWNERS MANUAL

CONTENTS
Introduction
39A ir valve placementa
Valve for 39A valves sizing
General rrangement and imensionsa d
Troubleshooting
Spares istl and torque figures
Maintaining the alvev
1
2
3
4
- 5 6
6
- 7 17

1
Thank you for choosing the air valve for your application.CLA-VAL 39A
The 39A has come about after extensive research and experience into air valves and water
pipelines. The 39A is perfectly suited for the bulk water market demands.
The 39A has several features which make it the best choice for your air valve application.
It is light and compact, easy to install, is simple to service and requires no initial spares. However should
you need to clean the valve or investigate the cause of any leakage, all O-rings are standard metric sizes
and are available from most reputable O-ring suppliers.
The valve has an integral anti slam feature specifically sized for bulk water pipelines. The 39A, if
correctly sized and placed, will offer surge protection in the event of rapid filling of pipelines and surge events
such as pump trip.
The 39A is also designed to offer full port vacuum break, in the event your pipeline been of
drained or if your pipeline suffers a pipe burst, thus ensuring the safeguarding of your pipeline, pipe
components, valves and seals.
The high volume air release function allows for uninterrupted filling at a safe filling rate. It will not interfere
or slowdown the consultants / engineers proposed filling rates, as long as the filling rates are within safe
parameters for the pipeline.
The small orifice functionality allows air to be removed from the system while the system is pressurised,
preventing the formation of air locks in the system and keeping the system running efficiently.
This manual is intended to give all the information necessary to, size your valve correctly, place your valve
correctly and maintain the valve when needed.
INTRODUCTION

2
39A AIR VALVE PLACEMENT
Centrifugal Pump
Isolang Valve
Check Valve
Air Valve
Submersible Pump
Under road
River crossing
Reservoir
Peak / High point
Break in slope
Peaks/ igh pointsh
The most important areas to place air valves are high points or peaks along the pipeline. Air will always rise to these
points when filling and when the pipeline is operating. Water will also always drain from the peaks first when
draining or in the event of a burst.
Breaks in slope
A break in slope is defined as any point where, under gravity, water will drain away from a point faster than it
reaches that point causing column separation. These points can also be a point of turbulence where air can be
released from solution.
Long ascending and descending sections
Air valves on long ascending and descending sections should be placed every 1970 ft.
Other places where air valves should be considered
In Pump Stations
Centrifugal pumps after check valves, preferably six times the pipeline diameter away from the check valve.
Turbine and ubmersible umps, before and after the check valve f only one is possible before the check s p . I , then
valve in these instances. a 39A All ir valves in pump stations should be of the b type of air valves.
Isolation and Check Valves.
Air valves should be placed with any isolation or inline check valve that will as a result of closure have water running
away from the valve. The air valve should be placed on the side of the valve that water will drain from. In the case
of solation valves or check valves placed on peaks an air valve should be placed either side of the valve.i

3
7
This table is to help you calculate your velocity, based
on flow and pipe size. Select your pipe size in the left
hand blue column. Run your finger to the right until you
find the flow rate closest to your pipelines maximum
demand rate. Drop your finger to the bottom blue column
and it will give you your flow velocity in feet per
second(ft/s). Should your pipe size not be available you
can calculate your velocity using this calculation:
How To Use the Chart
Select pipe size and velocity, use either maximum flow velocity or calculate drainage velocity based on drainage or
expected potential rupture. Where the pipe size and velocity intersect there will be a colour band, match the colour band to
the valve size in the legend below. This will give you the valve size of a valve capable of drawing in sufficient air to match the
drainage rate. All values are based on maintaining a minimum negative pressure of 5 psi in the pipeline pressure. It is not
good practice to allow the negative pressure drop below 8.5 psi negative differential in the pipeline. Be aware when sizing
that the upper part of the band is closer to the minimum negative differential of 5 psi and the lower part closer to 1.5 psi
negative differential pressure. If you are quite close to the higher part of the band, one should then switch to the next size
of valve to assure the safety of the pipeline.
VALVE SIZING
12"
10"
8"
6"
4"
3"
2"
1"
0
8
16
24
32
40
48
56
64
72
80
88
96
104
112
120
2 3 5 7 8 10 12 13 15 16 18 19 21 23 25 26 28 30 31 33
Velocity /s
A
Q
V321.0* =
Where
V= Velocity /s
Q=flow in gpm
A= Area inches²

4
Operating Pressures
7.2 - 363 psi
- 580 psi7.2
- 928 psi7.2
- 1450 psi7.2
Operating Temperatures
32 - 176°F
End Connection
Screwed NPT
Flanged studded
Double Acting with Anti Slam Orifice
(Triple acting / Three stage)
SERIES 39A
Larger sizes are available on request up to 18”
Size M odel no. Pressur e R ating O verall Height O verall Diameter W eight
SERIES 39A 363 psi 11.26" 3.94" 9 lbs
SERIES 39A 580 psi 13.23" 3.94" 11 lbs
SERIES 39A 363 psi 11.85" 5.12" 15 lbs
SERIES 39A 580 psi 13.62" 5.12" 18 lbs
SERIES 39A 232 psi 10.98" 7.87" 35 lbs
SERIES 39A 363 psi 10.98" 7.87" 35 lbs
SERIES 39A 580 psi 12.32" 7.87" 42 lbs
SERIES 39A 232 psi 10.79" 8.66" 35 lbs
SERIES 39A 363 psi 10.98" 9.25" 42 lbs
SERIES 39A 580 psi 12.56" 9.25" 51 lbs
SERIES 39A 232 psi 17.24" 11.22" 88 lbs
SERIES 39A 363 psi 17.68" 11.81" 102 lbs
SERIES 39A 580 psi 19.06" 11.81" 135 lbs
SERIES 39A 232 psi 19.57" 13.39" 132 lbs
SERIES 39A 363 psi 19.96" 14.17" 143 lbs
SERIES 39A 580 psi 20.87" 14.76" 181 lbs
10" SERIES 39A 232 psi 22.55" 17" 242 lbs
12" SERIES 39A 232 psi 24.6" 21" 418 lbs
8"
1"
2"
3"
4"
6"
Nuts SS 316
Screen Mesh S 316 S
Top Flange SS 316
O- ing NBR/EPDMR
Anti Slam Float HDPE
Nozzle Float HDPE
Nozzle SS 316
Nozzle Seat EPDM
Barrel SS 316
Control Float HDPE
Baffle Plate SS 316
Lower Flange SS 316
Studs SS 316
Top Cover S 316S
Tie Rods SS 316
1" & 2" threaded
Flanged option also available
General rrangement and imensionsa d

5
P
r
o
b
l
e
m
C
a
u
s
e
C
o
m
m
e
n
t
s
S
o
l
u
t
i
o
n
V
a
l
v
e
l
e
a
k
i
n
g
,
sometimes gushing,
sometimes dripping.
L
o
w
p
r
e
s
s
u
r
e
o
r
fluctuating pressure.
T
h
e
v
a
l
v
e
i
s
d
e
s
i
g
n
e
d
to seal at 7.3 PSI. If
pressures are below
this, the valve will
leak.
S
o
l
u
t
i
o
n
1
:
I
f
t
h
e
r
e
i
s
a
better location with
pressure, within the
working range of the
valve, transfer the
valve.
Solution 2: If the valve
placement is essential
for the application,
then fit the valve with
a discharge pipe, that
can pipe away the
leakage to a safe
place. (Contact your
agent or the
manufacturer for
options).
V
a
l
v
e
l
e
a
k
i
n
g
constantly.
S
a
n
d
o
r
s
i
l
t
i
n
t
h
e
valve.
I
f
s
a
n
d
a
n
d
s
i
l
t
g
e
t
passed into the valve,
the valve will leak.
S
o
m
e
t
i
m
e
s
w
i
t
h
s
a
n
d
and silt, the valve can
be flushed without
disassembly and this
may fix the problem.
This can be done by
isolating the valve
from pressure,
removing the top cap,
push down on the
floats and letting the
water pass through
the valve. Repeat two
or three times and
pressurise valve. If
leaking persists the
valve may need to be
opened and cleaned.
TROUBLE SHOOTING
In general the alve will leak as an indication of a problem. As such the first thing that needs , 39A v
to be done is define what we consider leaking: Air valves will always pass some vapour when water
discharging pressurised air his vapour may accumulate within the top of the air valve and offer the . T
appearance of leaking. The second phenomena which is often mistaken for leaking is as the valve builds to ,
sealing pressure some water may bypass the top float. Some of this water becomes trapped between the
sealed float and the top of the flange. As the valve breathes this air will push water out of the flange recess
l .and appear to be eaking. This will stop after a while of the valve been pressurised
What we define as a leak: leak is either a constant dripping or rivulet of water that does not stop. A

6
Problem Cause Comments Solution
Valve leaking
constantly.
Damage to O-ring or
nozzle seat or nozzle.
On occasion, debris
may pass into the
valve and pass out
freely. After a while,
however, during the
time the debris is
trapped in the valve,
an O-ring seal or other
component may get
damaged.
Follow maintenance
instructions and
replace damaged item.
V
a
l
v
e
l
e
a
k
i
n
g
constantly.
D
e
b
r
i
s
t
r
a
p
p
e
d
i
n
valve.
O
n
o
c
c
a
s
i
o
n
w
h
e
n
commissioning or
replacing pipes. Some
debris items may get
caught in the line and
washed into the valve.
F
o
l
l
o
w
m
a
i
n
t
e
n
a
n
c
e
instructions and
remove item.
SPARES KIT CONTENTS
Barrel O-rings x 2
Anti-slam O-rings x 2
Tie Rod O-Rings x 4 or 8 or 12 dependant on valve size
Nozzle
Nozzle seat
TORQUE FIGURES
DN 25 11 lbf.ft
DN 50 15 lbf.ft
DN 80 &100 30 lbf.ft
DN 150 & 200 52 lbf.ft

7
MAINTAINING THE VALVE
1. Before doing any maintenance on the valve make sure the valve is isolated from pressure .
Warning
solate the valve i
before commencing
any work
2. Remove the uts from the valve n .
Dome
Nuts

8
3. Remove the op ap from the valve t c
4. Remove the creen esh from valve. s m