The manifolds offer the user an uninterrupted gas supply with an alarm option to indicate the reserve cylinder bank has taken over. The unit comprises cylinder support rack, high pressure cylinder tailpipes c/w non-return valves, high pressure quick action shut-off valves, contact alarm gauge, 2 primary regulators with re-setting lever, line outlet pressure regulator, safety slam shut valve or pipeline pressure relief valve, flashback arrestor and 1/2" BSP line isolation valve.
Once the cylinder tailpipes have been connected to the cylinder bank, both isolating valves can be opened and by final adjustment of the line regulator, the unit is made operational. The operating lever determines which is the duty cylinder bank, when the lever is in the down position the right hand cylinder bank is in duty (as indicated on the unit cover). The unit will now supply gas until the pressure in the duty cylinder bank falls and at a pre-determined level the reserve cylinder bank will take over the supply of gas. The operator is alerted to the changeover by an alarm panel connected to the contact alarm gauge. The lever on the autochange unit requires re-positioning in order to both reset the alarm and allow for a continuous supply of gas. The empty cylinders should now be replaced, ensuring a repeated changeover can occur for a continuous supply of gas.