ISO 4126-4:2004
Safety devices for protection against excessive pressure - Part 4: Pilot-operated safety valves

Standard No.

ISO 4126-4:2004

Release Date

2004

Published By

International Organization for Standardization (ISO)

Status

Withdraw

Replace By

ISO 4126-4:2004/Cor 1:2007

Latest

ISO 4126-4:2013

Scope

This part of this European Standard specifies general requirements for pilot operated safety valves, other than those covered in Part 1, irrespective of the fluid for which they are designed. In all cases, the operation is carried out by the fluid in the system to be protected. It is applicable to pilot operated safety valves having a valve flow diameter of 6 mm and above which are for use at set pressures of 0,1 bar gauge and above. No limitation is placed on temperature. This is a product standard and it is not concerned with applications for pilot operated safety valves.

ISO 4126-4:2004 Referenced Document

• ASME B1.20.1 Pipe Threads@ General Purpose (Inch)
• EN 1092-1 Flanges and their joints - Circular flanges for pipes@ valves@ fittings and accessories@ PN designated - Part 1: Steel flanges*， 2018-04-01 Update
• EN 1092-2 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 2: Cast iron flanges*， 2023-11-29 Update
• EN 1092-3 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories PN designated - Part 3: Copper alloy flanges
• EN 12516-3 Valves - Shell design strength - Part 3: Experimental method*， 2024-04-18 Update
• EN 12627 Industrial valves - Butt welding ends for steel valves*， 2017-11-01 Update
• EN 12760 Industrial valves - Socket welding ends for steel valves*， 2016-04-01 Update
• EN ISO 6708 Pipework Components - Definition and Selection of DN (Nominal Size) (ISO 6708 : 1995)
• ISO 7-1 Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation TECHNICAL CORRIGENDUM 1

ISO 4126-4:2004 history

• 2013 ISO 4126-4:2013 Safety devices for protection against excessive pressure - Part 4: Pilot operated safety valves
• 2007 ISO 4126-4:2004/Cor 1:2007 Safety devices for protection against excessive pressure - Part 4: Pilot-operated safety valves; Technical Corrigendum 1
• 2004 ISO 4126-4:2004 Safety devices for protection against excessive pressure - Part 4: Pilot-operated safety valves