ISO 11363-1:2010 pdf free download – Gas cylinders – – 17E and 25E taper threads for connection of valves to gas cylinders一 Part 1: Specifications.
This part of ISO 11363 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 1 7E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders.
It does not cover the connection requirements for:
— mechanical strength;
— gas tightness;
— capability of repeated assembly and dismounting operations.
Gauge inspection is covered by ISO 11363-2.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1 General
2.1.1
basic profile
theoretical profile, when the profile of the external thread coincides with the profile of the internal thread
2.1.2
design profile
design profile differs from the basic profile due to the radius of the root, necessary for manufacturing and strength requirements
NOTE For such a profile, manufacturing tolerances are taken into account.
2.1.3
length of external thread,
length of full form thread on the valve stem, measured along the cone axis from the reference plane A
NOTE See Figure 1, Table 1 and Table 3.
2.1.4
length of internal thread, L2
length of full form thread in the cylinder neck, measured along the cone axis from the reference plane F
2.3.3
minor diameter, d11
diameter of the minor cone at the valve stem thread reference plane A (before any chamfer is cut)
2.3.4
minor diameter, D11
diameter of the minor cone at reference plane G
2.3.5
pitch diameter
diameter of the pitch cone at the valve stem thread reference plane A (before any chamfer is cut)
2.3.6
pitch diameter, d2
diameter of the pitch cone at reference plane B
2.3.7
pitch diameter, D1
diameter of the pitch cone at reference plane G
2.3.8
pitch diameter, D2
diameter of the pitch cone at reference plane F (before any chamfer is cut)
2.4 Terms relating to reference NOTE See Figure 1.
2.4.1
reference length, I
reference dimension being the distance between the parallel reference planes A and B
2.4.2
reference length, L1
reference dimension being the distance between the parallel reference planes F and G
2.4.3
reference plane A
reference plane coincident with the small end face of the threaded valve stem and corresponding to diameters
2.4.4
reference plane B
reference plane at a distance 11 from reference plane A and corresponding to diameter d2p
2.4.5
reference plane F
reference plane coincident with the entry section face of the cylinder neck thread and corresponding to pitch diameter
2.4.6
reference plane G
reference plane at a distance L1 from reference plane F and corresponding to diameter Die, D1 and D1.