AS 4617:2018 pdf free.Manually operated gas valves.
2.1 MATERIALS
2.1.1 Continuity of satisfactory operation
Materials used in the construction shall he such that continuity of safe and satisfactory
operation can he expected during normal usage within the manufacturer’s specification.
2.1.2 Suitability of materials for conditions of use
Materials and finishes, including dressings and lubricants, used in the construction, shall be suitable for the conditions of’ use, e.g. corrosion, temperature, handling.
2.1.3 Materials in contact with gas
Materials in contact with the gas, including lubricants, dressings and jointing compounds, shall be suitable for use with all gases.
2.1.4 Melting point of metallic materials
Metallic materials shall have a melting point not less than 430°C.
Conformance shall be assessed by testing in accordance with the method in Clause B4 of
Appendix B.
2.1.5 Copper containing alloys
Components made of’ copper containing alloys shall he resistant to stress corrosion cracking
when tested in accordance with ISO 6957 or AS 2136.
2.2 CONSTRUCTION
2.2.1 Continuity of satisfactory operation
Construction shall ensure continued safe operation during usage within the manufacturer’s specification.
2.2.2 Castings and hot pressings
All castings and hot pressings shall he clean and sound, free from laps, blow holes and
pitting. All surfaces not machine finished shall be clean, smooth and free from sand.
2.2.3 Sealing of porous castings or cracks
Porous castings or cracks in gas-carrying parts shall not he sealed other than by an accepted method for the impregnation of’ castings, e.g. vacuum impregnation.
2.2.4 Assembled valves to be clean
The assembled valve shall not contain dirt, casting sand. swarf or other foreign matter.
There shall he no excess diaphragm dressing, lubrication or jointing compound in the valve.
2.2.5 Accidental displacement of parts
Every part shall be secure against accidental displacement. Every part shall be constructed to maintain a fixed relationship between essential parts under normal and reasonable conditions of’ handling and usage so as to ensure continued cont’ormance with this Standard.
2.2.6 Attachment of knobs, handles, dials and pointers
Knobs, handles, movable dials and pointers, where supplied, shall be securely attached to their spindles.AS 4617 pdf download.