Constant pressure throttling device for natural gas well

The invention relates to a constant pressure throttling device for a natural gas well. The constant pressure throttling device includes a shell and a piston capable of reciprocating in the shell; oneend of the piston is connected with an elastic device; the elastic device is fixed on a spring limit member; the other end of the piston is provided with an opening and is limited by a piston limit member; the shell and the piston corresponding to the outer circumference are respectively provided with flow limitation holes penetrating through a natural gas pipeline; and the flow limitation holes communicate with the opening of the piston through an inner cavity of the piston. The constant pressure throttling device can achieve automatic adjustment of the size of an air nozzle of the throttlingdevice, achieves constant pressure throttling, and enables the labor intensity to be reduced, the cost to be reduced and the work efficiency to be improved. 本发明涉及种天然气井恒压节流装置，所述恒压节流装置包括壳体和在壳体内能够做往复运动的活塞，所述活塞端连接有弹性装置，所述弹性装置固定在弹