The invention discloses an axial-flow-type switch valve, and belongs to the technical field of valves. The axial-flow-type switch valve comprises a first
flange connecting sleeve, an executing mechanism
piston cylinder and a second
flange connecting sleeve which are mutually connected. A
piston-type driving mechanism is arranged in the executing mechanism
piston cylinder, the piston-type driving mechanism comprises a valve element of a cylindrical structure and a piston connected with the outer side of the valve element in a sleeved mode, a piston is in
elastic matching with a spring pad arranged in the executing mechanism
piston cylinder, one end of the valve element is in sealing matching with the first
flange connecting sleeve, and the other end of the valve element is matched with a
valve seat arranged in the second flange connecting sleeve. According to the axial-flow-type switch valve, the mode that an executing mechanism, the piston, the valve element, the
valve seat and the flange connecting sleeves are coaxially combined is adopted, the valve structure design concept that in the prior art, an executing mechanism can only be arranged outside a valve body is broken through, and the defects that an existing piston-type executing mechanism is large in
friction force, low in response speed, low in adjusting precision and large in
leakage rate are overcome.