The backing pressure of seal changed, in the mean time clean gas supply is changing accordingly to keep constant different pressure between seal gas supply and backing pressure. This will ensure a stable working environment of DGS.

• 干气密封背压变化时，密封气供应需保持动态跟随，使密封气与其背压之间的压差保持恒定，以此来保证干气密封稳定的密封环境。