VACUVENT 025VA25 Owner'S Manual Download Page 16

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Independent Valve Marketing (Pty) Ltd

Engineering

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VSS0203WD00

PIPELINE FILLING

Venting of large quantities of air

During pipeline filling a large amount of air needs to escape from the pipeline, during this operation

shown in figure 5- the small orifice, item 1 gives way and air discharges through the anti-shock

orifice, item 2, through the upper float.

This discharge will be sufficient for the pressurised air to evacuate the valve and the pipeline. This

type of valve operation is validated by Surge Analysis Software. It is not necessary for some or all

the air to exhaust through the large orifice as on other air valves.

After the air has exhausted from the pipeline and water fills the air valve, the smart anti-shock orifice

will shut and the air valve will once again pressurise.

Figure 6- Air Valve Anti-Shock Operation

Summary of Contents for 025VA25

Page 1: ...AIR RELEASE AND VACUUM BREAK VALVES SERIES VA OWNER S MANUAL...

Page 2: ...neral Specification 5 General Specification 6 Quality Control 10 General Description 10 Functional Testing and Overall Inspection 11 Corrosion Protection 11 Shipping 11 Installation Removal and Storag...

Page 3: ...for the installation maintenance and general care required by the air valve to produce optimum results for the end user Your Vacuvent air valve should function flawlessly for many years as it is virtu...

Page 4: ...all and large orifice with Anti Shock Orifice Mechanism End Connection Screwed BSP or NPT male Nominal Size DN25 1 and DN50 2 Model No s See Table Operating Pressure PN25 0 5 bar 7 2 psi 25 bar 363 ps...

Page 5: ...d Connection Flanged for alignment to BS 4504 PN10 PN16 PN25 or PN40 SANS 1123 T1000 3 T1600 3 T2500 3 or T4000 3 ANSI B16 1 Class150 or ANSI B16 5 Class 300 Nominal Size DN150 and DN200 Model No s Se...

Page 6: ...m End Connection Flanged for alignment to BS 4504 PN10 PN16 PN25 or PN40 SANS 1123 T1000 3 T1600 3 T2500 3 or T4000 3 ANSI B16 1 Class150 or ANSI B16 5 Class 300 Nominal Size DN150 and DN200 Model No...

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Page 9: ...Independent Valve Marketing Pty Ltd Engineering Page 9 of 18 VSS0203WD00...

Page 10: ...re variance in pipelines Surge and water hammer will always be present in fluid transporting pipelines the intent of the Vacuvent air valve is to effectively manage the affects thereof in liquid trans...

Page 11: ...eline under pressure Criteria Small orifice release of air up to working pressure Anti shock opening up to working pressure 5 Visual Inspection Purpose Ensure quality of the product Criteria No visibl...

Page 12: ...cumulator facilitates the effective introduction of air into a draining pipeline If an accumulator is not used the incoming air may be swept away before effectively vented Figure 4 Air Valve Arrangeme...

Page 13: ...ring the air valve firmly DO NOT USE A PIPE WRENCH ON THE AIR VALVE AND ON THE BARREL OF THE AIR VALVE THIS MAY RESULT IN DAMAGE TO THE COATING AND OR MECHNICAL DAMAGE TO THE AIR VALVE FLANGED TYPE Fl...

Page 14: ...alculated by adding all the valves on that section Exhaust however is another matter and it s feasible in some instances to add all the anti shock capabilities for one section It s also important to e...

Page 15: ...to protect the pipeline and seals from low pressure within the pipeline during draining or other pipeline disturbances e g pump trip One accepted method is to limit the internal pressure to 3 5 m P 5...

Page 16: ...shock orifice item 2 through the upper float This discharge will be sufficient for the pressurised air to evacuate the valve and the pipeline This type of valve operation is validated by Surge Analys...

Page 17: ...ove figure one can see the air accumulating in the valve with the pipeline under pressure generally only when small amounts of air enters the valve through the pressurized system again this operation...

Page 18: ...one valve with its smart anti shock will fulfil the functions of several different valves without modification or ad ons CONTACT DETAILS Feel free to contact us regarding your Vacuvent valve should yo...