BS EN 417:2009 pdf download – Non-refillable metallic gas cartridges for liquefied petroleum gases, with or without a valve, for use with portable appliances — Construction, inspection, testing and marking
4.4Cartridges with valves
4.4.1Valve design General requirements for every type of valveCartridges with valves shall be either:
a) of such a design that it is not possible to operate the valve without the use of a special adaptor b; or
NOTE The connection on the appliance with which the gas cartridge is designed to be used may be considered as aspecial adaptor.
b)provided with adequate protection against inadvertent discharge.
The valves shall be of such a design that,under conditions of normal use, they close when the special adaptor isremoved or the valve released.Valves which close by means of internal gas pressure only are not permitted.
After 50 opening and closing operations, the valve shall not show signs of leakage or other defects (see 6.6).The valve cup, if any, shall be free from burrs and sharp edges. fitted with threaded centre boss valve cups The valve cup shall be made from carbon or alloy steel of suitable uniform quality, which may becoated, (e.g. hot-dipped tinplate). The valve or closure shall be one of the following types:
– type 1 :Female valve (see 3.12) mounted in a double layer, threaded centre boss valve cup;
– type 2: Male valve(see 3.13) mounted in a double layer, threaded centre boss valve cup;
– type 3:Female valve (see 3.12) mounted in a single layer, threaded centre boss valve cup (see annex A);- type 4: Male valve (see 3.13) mounted in a single layer , threaded centre boss valve cup (see annex A).
NOTE For wishing to avoid a sudden change in the rule of operation of EN 417, the CEN/BT/TF 14 decided thatspecifications related to single layer valves (type 3 and 4) be moved in an informative annex (annex A) and remain in forceduring a transitional period of five years after the publication of the revised standard. The valve shall not break when a torque of 15 N-m is applied as indicated in Filled cartridges fitted with type 1 valves
Filled cartridges fitted with type 1 valves shall comply with the following:
a)the valve cup component shall be manufactured from a double layer of material;
b)the thickness of the valve cup shall be between 0,30 mm and 0,57 mm;
NOTE Special attention is drawn to the material thickness at the root of the thread.
c) the centre boss of the valve cup shall be externally threaded for at least four and a half full threads with the following external screw thread:
Major diameter 1 0,60 mm to 1 0,85 mm;
Minor diameter 1 0,05 mm to 1 0,1 5 mm;
Effective diameter 1 0,51 mm to 1 0,65 mm;
The thread shall be a rolled thread (see Figure 2);
d) the top surface of the centre boss shall be raised at an angle of 25° to the horizontal over an area defined by a circle of (5,65 ± 0,1 5) mm which is concentric with the major diameter of the thread tolerance: 0,1 5 mm maximum (see Figure 3);