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Installation, Operation and Maintenance Manual -
Original Version
AVK Series 869 Diaphragm Operated Control Valve
Pressure Sustaining/Relief Valve
AVK diaphragm operated control valves for pressure sustaining/relief applications
automatically maintain a minimum inlet pressure, regardless of changes in flow rate or
outlet pressure.
The main control valve is pilot operated, capable of precise setting and easy
adjustment of wanted inlet pressure sustaining, back pressure or hydraulic un-loading
applications.
Diaphragm Operated Pressure Sustaining/Relief Valve
Page 1 of 12
Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021
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Table of Contents
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Summary of Contents for AVK 869 Series
- Page 1 The main control valve is pilot operated, capable of precise setting and easy adjustment of wanted inlet pressure sustaining, back pressure or hydraulic un-loading applications. Diaphragm Operated Pressure Sustaining/Relief Valve Page 1 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021...
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Page 2: Avk Series 869 Psv Exploded View
1. AVK series 869 PSV exploded view DN50FB – 350RB DIAPHRAGM CONTROL VALVE EXPLODED VIEW Page 2 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... - Page 3 DN350FB – 600FB DIAPHRAGM CONTROL VALVE EXPLODED VIEW Page 3 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021...
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Page 4: Avk Series 869 Psv Parts List
Stainless Steel Diaphragm Support Ductile Iron Stem Stainless Steel Plug Stainless Steel Disc Retainer Ductile Iron Regulating Plug Stainless Steel Adaptor Stainless Steel Body Ductile Iron Page 4 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... - Page 5 Adaptor Stainless Steel Stem Stainless Steel Washer Bronze Plug Stainless Steel Diaphragm EPDM Disc Seal EPDM Seat Stainless Steel Ball Valve Stainless Steel Body Ductile Iron Page 5 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021...
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Page 6: Table Of Contents
9.3 Repair of valve ......................11 9.3.1 Replace the pilot valve ..................11 9.3.2 Replace the filter ....................11 Trouble shooting ......................12 Recommended spare parts ..................... 12 Page 6 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... -
Page 7: Principle Of Operation
4. Principle of operation AVK diaphragm operated control valves can easily be altered to suit different functions with additional option of replacing the control module, original main valve can be used. The main control valve is pilot operated, capable of precise setting and easy adjustment of wanted inlet pressure sustaining, back pressure or hydraulic un-loading applications. -
Page 8: Health And Safety At Work
AVK’s products are designed to be fit for purpose and to a high reliability standard. This provides a safe, low risk product when used correctly for the purpose for which it was designed. However, this assumes that the equipment is used and maintained in accordance with this manual, and the user is advised to study it and to make it available to all staff that may need to refer to it. -
Page 9: Installation And Commissioning
The distance to elbows must be kept to a minimum of 5 x DN, upstream or downstream. Typical installation: A- Isolation valve upstream B- Air vent C- Filter D- S869 Pressure Sustaining/Relief Valve E- Isolation valve downstream Page 9 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... -
Page 10: Commissioning
Valves must only be installed in a piping system whose pressure and temperature do not exceed its nominal pressure (PN) If system testing will subject the valve to pressures more than the working pressure rating, this Page 10 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... -
Page 11: Operation And Maintenance
Close both upstream and downstream isolation valve (A, E), and close both ball valve (1,2) and needle valve 4, remove the filter 6 and replace it with a new one. Page 11 of 12 Copyright © AVK Holding A/S, original version, rev. 1, 8-July-2021... -
Page 12: Trouble Shooting
AVK accepts no responsibility for damage caused by failing non-AVK parts. The use of inferior materials or parts in a valve can have serious consequences. It is AVK policy therefore, to use only materials of the highest quality, manufactured to our own designs and thoroughly checked and tested in accordance with our internal Quality Assurance system that is approved to ISO 9001:2000.
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