BS EN 521:2006 pdf download.Specifications for dedicated liquefied petroleum gas appliances— Portable vapour pressure liquefied petroleum gas appliances.
5.7.2.2.4 A valve actuator shall be fixed on the axis of the adaptor in such a way that it allows the drawing off of gas from a full cartridge in accordance with 5.7.1. The valve actuator shall allow the release of gas from the cartridge when the appliance is screwed onto the valve with a minimum torque of 3 Nm.
5.7.2.2.5 The diameter of the valve actuator shall not exceed 2,20 mm if it is solid and shall be between 3.10 mm and 3.15 mm if it includes a gas way as indicated in Figure 2 b). The valve actuator shall be concentric with the “7116 in - 28 unified form thread” subject to a tolerance of 0,15 mm (see Figures 2 a) and 2 b)).
5.7.2.2.6 At the point where the valve actuator comes into contact with the valve seat, the valve actuator diameter shall be at least 1,70 mm (see Figure 2 a)).
NOTE It is recommended that adaptor manufacturers contact manufacturers of cartridge valves to establish the preferred design (see Figure 2 b)). The valve actuator shown in Figure 2 b) comes in contact with the inner seal of the valve ensuring complete soundness when the cartridge is fitted.
5.7.2.2.7 A seal groove shall be machined at the bottom of the threaded part so as to centre and secure a seal (see Figure 2 a)). This seal shall come into contact with the valve centre boss. The seal and the seal groove shall be such that there is no visible and permanent distortion of the threaded centre boss when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.8 The length of the valve actuator shall be such that it does not penetrate into the valve for a distance exceeding 4,15mm below the plane of the upper side of the centre boss (see Figure 4, dimension X) when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.9 The inlet of the adaptor prior to the thread shall be a maximum of 2,00 mm deep and have a diameter of between 11,0mm and 12,0 mm. In addition, the inlet of the adaptor shall begin with a 1.0 mm x 450 chamfer (see Figure 2 a)).
5.7.2.2.10 The diameter of the adaptor which penetrates the valve seal groove shall not exceed 22,90 mm. This part shall not extend more than 3,5 mm from the start of the adaptor thread (see Figure 2 a)).
5.7.2.2.5 The diameter of the valve actuator shall not exceed 2,20 mm if it is solid and shall be between 3.10 mm and 3.15 mm if it includes a gas way as indicated in Figure 2 b). The valve actuator shall be concentric with the “7116 in - 28 unified form thread” subject to a tolerance of 0,15 mm (see Figures 2 a) and 2 b)).
5.7.2.2.6 At the point where the valve actuator comes into contact with the valve seat, the valve actuator diameter shall be at least 1,70 mm (see Figure 2 a)).
NOTE It is recommended that adaptor manufacturers contact manufacturers of cartridge valves to establish the preferred design (see Figure 2 b)). The valve actuator shown in Figure 2 b) comes in contact with the inner seal of the valve ensuring complete soundness when the cartridge is fitted.
5.7.2.2.7 A seal groove shall be machined at the bottom of the threaded part so as to centre and secure a seal (see Figure 2 a)). This seal shall come into contact with the valve centre boss. The seal and the seal groove shall be such that there is no visible and permanent distortion of the threaded centre boss when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.8 The length of the valve actuator shall be such that it does not penetrate into the valve for a distance exceeding 4,15mm below the plane of the upper side of the centre boss (see Figure 4, dimension X) when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.9 The inlet of the adaptor prior to the thread shall be a maximum of 2,00 mm deep and have a diameter of between 11,0mm and 12,0 mm. In addition, the inlet of the adaptor shall begin with a 1.0 mm x 450 chamfer (see Figure 2 a)).
5.7.2.2.10 The diameter of the adaptor which penetrates the valve seal groove shall not exceed 22,90 mm. This part shall not extend more than 3,5 mm from the start of the adaptor thread (see Figure 2 a)).
