Patent ID: 8567636

Claim:
A hydro-pneumatic pressure vessel comprising: a container unit including an elastic diaphragm that divides an inner space of said container unit into a water chamber and an air chamber; a connector unit including a water fitting that is connected to said container unit and that is formed with a water port communicating fluidly with said water chamber; and a protecting unit including a protecting member that is disposed in said water chamber and that has a size larger than that of said water port, and a resilient connecting member that interconnects said water fitting and said protecting member, said protecting member being movable resiliently between an open position, where said water chamber is filled with water and where said protecting member is away from said water port, and a blocked position, where the water flows out of said water chamber, where said resilient connecting member is compressed resiliently and where said protecting member blocks said water port so as to prevent said diaphragm from being squeezed by an air pressure of said air chamber into said water port; wherein said water fitting has an inner surrounding surface that defines said water port; wherein said resilient connecting member is configured as a conical spiral spring that has a larger end secured fixedly to said inner surrounding surface of said water fitting, and a smaller end secured fixedly to said protecting member; wherein said resilient connecting member is configured as a conical spiral spring that has a larger end secured fixedly to said inner surrounding surface of said water fitting, and a smaller end smaller than said larger end; wherein said protecting unit further includes a coupling member that secures said smaller end of said resilient connecting member to said protecting member; wherein said water fitting further has a shoulder portion formed on said inner surrounding surface; and wherein said larger end of said resilient connecting member abuts fixedly against said shoulder portion.