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The Davidson ATV hydrant security device
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Davidson ATV hydrant security valve FAQ
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About the ATV
   
The Davidson ATV is a hydrant security device or stealth check valve which reduces the potential for those with ill intent to contaminate treated drinking water by introducing toxins or other materials into the drinking water via the fire hydrant.
   
• Meets American Waterworks Association requirements for backflow devices.
   
• The ATV consists of four main parts: collar, piston, stainless steel machined shaft, and stainless steel spring.
   
• The collar is made of brass and is permanently affixed to the barrel of the hydrant just below the lowest outlet. The collar is aerodynamically shaped forming a venturi in the barrel of the hydrant to minimize loss of flow at any operating pressure. A neoprene quad O-ring is attached to the top of the collar in a machined track. This O-ring provides an impenetrable seal upon piston closure.
   
• The stainless steel machined shaft replaces the hydrants original cold rolled steel valve shaft.
   
• The piston fits around the machined shaft operating vertically when activated by water flow and closing via spring force prior to pressure equalization. The piston is sealed to the shaft via a EPDM O-ring providing an impenetrable seal.
   
• The stainless steel spring fits around the shaft and attaches to the top of the piston and the bottom of the bonnet of the fire hydrant insuring piston closure against the seal of the collar prior to any backflow occurring.
   
• The ATV is equally effective in prevention of contamination under pressure or contamination by siphoning into the water main.
   
• This is the first major step in protecting the water distribution system and finished drinking water supply, and in the prevention of intentional contamination through the hydrant.
Test Results for the Davidson ATV conducted by Louisiana State University found that:
 
  "totally effective in the prevention of the insertion of objects into the hydrant which could cause damage to the pumper or hamper fire fighting (rocks, bottles, tennis balls, etc.)"
 
  "negligible loss of water flow for fire fighting purposes"
 
  "totally effective in the prevention of foreign matter insertion into water supply via the fire hydrant"
 
  "0% (zero) failure of valve with 100 years simulated operation"
 
  Still Vulnerable
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