CLA-VAL 39A Manuale utente

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

- 5 6

- 7 17

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

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

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"

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

V321.0*

Where

V= Velocity /s

Q=ﬂow in gpm

A= Area inches²

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

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

sometimes gushing,

sometimes dripping.

fluctuating pressure.

to seal at 7.3 PSI. If

pressures are below

this, the valve will

leak.

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).

constantly.

valve.

passed into the valve,

the valve will leak.

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

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.

constantly.

valve.

commissioning or

replacing pipes. Some

debris items may get

caught in the line and

washed into the valve.

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

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

3. Remove the op ap from the valve t c

4. Remove the creen esh from valve. s m

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