One-way throttle valve

The utility model discloses a one-way throttle valve, which structurally comprises a valve body, an O-shaped rubber seal ring, a spool, a retainer ring and elastic retainer ring for a hole. The spool is mounted in an inner cavity of the valve body, the spool is provided with a throttle hole communicated with the front end and the rear end of the valve body, a seal mounting groove on an outer slope of the front end of the spool is used for mounting the O-shaped rubber seal ring, and the O-shaped rubber seal ring has closing and limiting function when a liquid flows from an end A to an end B or from the end B to the end A. The one-way throttle valve has the advantages of simple structure, low manufacturing cost, stable performance, long service life, wide application and the like.