Four-function anti-water hammer air valve set

A multifunctional anti-surge air valve set, comprising:

• a negative pressure air intake valve which comprises a valve body, a valve cover provided on said valve body, a high speed air intake orifice formed on said valve body of said negative pressure air intake valve and facing downwardly thereof, an adjustment spring provided in said valve body of said negative pressure air intake valve, and an intake valve disc movably provided in said valve body of said negative pressure air intake valve at a position above said high speed air intake orifice, wherein when a negative pressure is developed in said valve body of said negative pressure air intake valve, said negative pressure is arranged to drive said intake valve disc to move upwardly so as to open said air intake orifice for allowing air to rapidly enter said negative pressure air intake valve through said air intake orifice;
• a control isolating valve provided on a top portion of said negative pressure intake valve;
• a mid-high rate air release valve which is mounted on a top portion of said control isolating valve, and comprises a valve body, a valve cover provided on said valve body of said mid-high rate air release valve, a first float ball movably provided in said valve body, a mid-high rate air release orifice provided on said valve body of said mid-high rate air release valve for allowing air in said valve body to be discharged out of said mid-high rate air release valve;
• and
• a small-amount air venting valve extended from said negative pressure air intake valve at a position spacedly apart from said control isolating valve and said mid-high rate air release valve, said small-amount air venting valve comprising a valve body, a valve cover provided on said valve body of said small-amount air venting valve, a second float ball provided in said valve body of said small-amount air venting valve, and a small-amount air venting orifice for allowing a small amount of air to be discharged.