Patent ID: 7302961

Claim:
A surge relief valve comprising: a main valve body comprising a dome port and an inlet port, wherein said inlet port is in fluid communication with a first fluid; a springless dome reservoir connected to said main valve body via said dome port and arranged to hold a second fluid, said dome reservoir external to said main valve body; a piston located in said main valve body, wherein said piston is in fluid communication with said reservoir; and, a dampening ring positioned circumferentially about said piston and operatively arranged to dampen movement of said piston; wherein said first fluid exerts an upward force on said piston, said second fluid exerts a downward force on said piston, and said piston is arranged to move in response to a differential in said upward and downward forces, wherein said first and second fluids are isolated from one another; and, wherein said springless dome reservoir lacks a piston; and, wherein said downward force is created solely by compression of said second fluid within said springless dome reservoir.