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Dynamically balanced suction relief for hydrotherapy tubs and spas

  • US 4,602,391 A
  • Filed: 10/17/1985
  • Issued: 07/29/1986
  • Est. Priority Date: 10/17/1985
  • Status: Expired due to Term
First Claim
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1. A dynamically balanced suction line relief for tubs, spas and pools comprising, a water circulation line having a water pump therein and including a suction line communicating between a water outlet in the tub and the pump and the water pressure line between the pump and a water inlet in the tub,an air inlet duct communicating with the suction line and extending upwardly therefrom and opening to the atmosphere at its upper end, said duct holding a column of water therein during normal operation while the tub is filled with water and the water outlet of the tub is unobstructed,a water make-up means operatively associated with the air inlet duct for forcing make-up water thereinto under pressure from the water circulation line to maintain the column of water therein until the outlet becomes obstructed whereupon the column of water is drawn down and air enters the suction line thereby causing the pump to cavitate relieving the suction.

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