Pressure vacuum breaker
AssigneeRosenblad Corporation
InventorAxel E. Rosenblad
Life of this patent
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Abstract
Excess steam pressure is relieved by displacement of a column of water through a vertical conduit opening a path for escape of steam through a space normally occupied by the water which normally acts as a seal. Under reversed conditions, air enters when the water is moved out of its sealing location by vacuum. The pressure vacuum breaker disclosed replaces flapper valves commonly used for pressure relief in paper making applications and has no moving mechanical parts.
Claims6
A pressure vacuum breaker comprising a well having a generally flat bottom and an upstanding generally cylindrical side wall for containing a quantity of liquid;
- liquid supply and overflow means communicating with said well to maintain a normal liquid level in the well;
- a generally cylindrical vertical conduit extending upward generally coaxially with said side wall from a level below the normal liquid level in the well to a height above said normal liquid level, a lower end of said conduit being spaced from said well bottom, said wall and conduit being housed within a generally cylindrical housing coaxial therewith and spaced from said well side wall;
- an annular partition plate surrounding said conduit above said well and extending between said conduit and said housing;
- and means for communicating to said well pressure in a vessel to be protected by the pressure vacuum breaker for displacing liquid from said well whenever such pressure exceeds pressure limits, whereupon gas or vapor can pass freely through said conduit, said pressure communicating means including an annular space between said housing and said side wall.
The device of claim 7 wherein said angular momentum imparting means comprises a plurality of stationary inclined vanes.
Dependencies are inferred from the claim text.