English to Persian (Farsi) Tech/Engineering Mechanics / Mech Engineering

Hello,
How would you translate 'main line fuel shutoff' in the following text?
ASCO provides the broadest line of solenoid & motorised shutoff valves designed to control the flow of fuel gas, liquid propane and all grades of fuel oil used in combustion applications such as: industrial furnaces, ovens, kilns, incinerators, burners and boilers. Solenoid operated valves handling combustion system pilot and main line fuel shutoff and control needs.
https://www.processindustryforum.com/article/everything-need...