Connecting fastener for pressure reducing valve and metal pipe

The utility model belongs to the technical field of connecting fasteners, and discloses a connecting fastener for a pressure reducing valve and a metal pipe, which comprises a fastener base, an arc-shaped piece connected to the top of the fastener base through an adjusting shaft, a fixing seat arranged on one side of the fastener base, and a reinforcing fixing assembly connected with the arc-shaped piece through a fixing screw. Comprising a reinforcing arc-shaped piece, the reinforcing arc-shaped piece is located in a fastener base, an adjusting groove used in cooperation with the reinforcing arc-shaped piece is formed in the fastener base, and when a metal pipe and the arc-shaped piece are used in a matched mode, the fastener base and the arc-shaped piece are connected through a fixing screw rod; a reinforcing and fixing assembly is movably connected into the fastener base, when the diameters of the metal pipes are different, the connecting fastener can adapt to the metal pipes of various sizes by adjusting