AS 4629-2005 (AM1/2) has been revised and divided into two parts: AS 4629.1, Automatically operated valves for gas – Part 1 Shut off valves AS 4629.2, Automatically operated valves for gas – Part 2 Vent valves. Other major changes from the 2005 edition are as follows: Partial alignment to international Standards and a first step towards recognition of International Standards; Changes of Classifi..