Cla-val 38VB/AR Series Manuel d'utilisateur télécharger pdf

SERIES

INSTALLATION / OPERATION / MAINTENANCE

38VB

Vacuum Breaker W/Optional Air Release Valve For Water and Sewage

1/2” - 3” Threaded 4” - 10” Flange Style

INTRODUCTION

Cla-Val Vacuum Breaker Valves are designed to perform years of

trouble free operation and service life. The valve functions to open,

allowing air to enter a pipeline, tank or system to prevent vacuum

forming. Sizes 1/2” thru 3” have threaded inlet and outlet, 4” and

larger have a flanged inlet as standard and a threaded, flanged or

plain outlet covered by a steel hood.

Standard Vacuum Break valves

have an internal spring with a fixed

rate to open between 1/4 - 1/2 PSI.

See fig 1. and Fig 1A For Vacuum

Breaker adjustability, external

spring with adjusting nut is sup-

plied see Fig.3. For Sewage, a

clear flow area body with external

spring and flushing valves is sup-

plied. see fig.4

Vacuum Breaker Valves in 2 Style:

HOW THEY WORK

The vacuum breaker valve (large ori-

fice combined with Air Release (small

orifice) are both normally closed but

when installed at points where vacuum

can occur. they work as follows:

The large orifice valve will open under

vacuum, allowing air into pipeline to fill

the void, created by vacuum. Next it

instantly closes trapping air, that is

compressed, there by cushioning

return of positive fluid pressure, to pre-

vent severe pressure surge and water

hammer,

Optionally the small orifice Air Release

Valve will also open, due to vacuum

and stays open acting as the outlet, to

slowly release the trapped air, from the

system until normal pressure is

achieved at which point the small

orifice closes.

RECEIVING AND STORAGE

Immediately inspect shipment upon receipt for damage in transit and

report same to carrier.

Store valves in a dry area until ready to install to prevent damage

when storing longer than six months coat rubber seat with FDA

approval grease to preserve resiliency.

Fig.4

Optional

Air Release

Valve

SMALL

ORIFICE

AIR RELEASE

OPEN

CLOSED

VACUUM

BREAKER

LARGE

ORIFICE

AIR

OUT

AIR

Large

Orifice

Fig 1A

AIR RELEASE

small

orifice

VACUUM

BREAKER

LARGER

ORIFICE

For Sewage

Fig. 4

STANDARD

ADJUSTABLE

Valve Shown in

Open Position

1 2 3 4

Résumé du contenu

Page 1 - Air Release

SERIESINSTALLATION / OPERATION / MAINTENANCE38VBVacuum Breaker W/Optional Air Release Valve For Water and Sewage1/2” - 3” Threaded 4” - 10” Flange Sty

Page 2 - THREADED

VALVE CONSTRUCTION FLANGE STYLEVacuum breaker valve bodies are heavy cast iron. The seat & plug of theflange style valves are bronze Fig 1. The pl

Page 3 - SETTING THE BREAKER VALVE

INSTALLATION/OPERATIONInstallation of the vacuum breaker valve is important forits proper operation. Valves must be installed in a verticalposition wi

Page 4 - PARTS AND SERVICE

DISASSEMBLYThe Vacuum Breaker Valve may be disassembled withoutremoval from the pipeline or may be removed from the linefor more convenience. Work

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Cla-val 38VB/AR Series Manuel d'utilisateur

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