Pilot safety valve is get spring direct role for conducting valve indirect effect and improve the action, and the main valve the sensitivity of the piston use socket, double seal valve structure, the movement of high precision, repeatability, back seat quickly, not leak, take off-design emissions and work and life long and stable and reliable, it also can be online adjustment, repeatedly rev jump after emissions, still can automatically back seat, shuts rigor, operation and maintenance is convenient.

Pilot safety valve is widely used in natural gas, liquefied petroleum gas (LPG) and chemical pressure container equipment and industrial piping, have fire prevention explosion-proof, anti-static and reliable sealing and lifts quickly and displacement big outstanding advantages. Kelamayi oilfield gas pipeline A46F - 320DN50 used forerunner safety valve working pressure for 23105 ~ 2713MPa run more than 45 ℃ temperature, medium, medium belongs to the gas-liquid two phase.
Pilot safety valve structure characteristics

Pilot safety valve from the main valve, guide valve, bleeder valves, fittings and catheter etc. In normal conditions, the system the medium pressure in the role of the main valve disc is below, and the effect on the main valve disc above. The main disc above the gas chamber medium than effect area, in effect area below medium under the action of pressure difference, the main valve disc is closed. With the rise of pipeline medium pressure, then seal the seal obtained than pressure will increase, which and spring with direct load safety valve is exactly the opposite, i.e. the higher medium pressure sealing the more reliable. When pipelines medium abnormal pressure setting, reach or exceed pressure, guide valve (figure 2) on disc quick opening, the main valve disc of indoor media through the air above the exhaust valve guide joint rapid eduction, the main valve disc media pressure below the powerful function, instantaneous open from the main valve, the export of medium, large discharge pipeline quickly the medium pressure returned to normal working pressure, ensure that the system's safety. When pipelines medium pressure setting below system pressure set about 90%, guide valve disc closed, pipe medium and through guide valve into the disc at the top of the gas chamber. In the pressure difference, under the action of the main valve closed, ensure that the system's work.