Abstract: In order to solve the problem that valve chamber for gas transmission pipeline suffers frequently from stray current or lightning stroke in China, a technical reformation of valve chamber is put forward. It mainly includes reformation of stray current discharge when vent stack is grounded for electricity discharge, reformation of "gas-electricity separation" of solenoid valve actuators in Shafer electronic control box, and reformation for outdoor discharge of 3 indoor vent (pollutant discharge) stack of block valve on trunk line of such actuators. In order to solve the problems of electrical isolation which can take place easily during the reformation of valve chamber on trunk line, the examination method of grounding grid isolation is proposed, and relevant suggestions are made.