Automatic vacuum stabilizing valve
AssigneeJWI Ltd.
InventorDerrick Ronald Woodward
Life of this patent
Estimating the term…
Abstract
An automatic adjustable bleed valve having an angularly displaceable valve body provided with an inlet opening and an outlet opening. A passageway interconnects a lower inlet and upper outlet openings. A gravity actuated displaceable valve element is mounted for guided movement in the passageway. A valve element seat is provided internally of the valve body about the inlet opening for receiving the valve element in close seated contact thereon. A stop element is provided internally of the body adjacent the outlet opening to limit the displacement of the valve element while permitting fluid passage from the inlet opening to the outlet opening about the valve element. A locking element is provided to hold the valve body in the desired angular position of adjustment.
Claims14
An automatic adjustable bleed valve comprising a valve body having means defining a lower inlet opening and an upper outlet opening with a passageway interconnecting said inlet and outlet openings, said valve body having a long axis, a displaceable gravity actuated valve element mounted for guided movement in said passageway, a valve element seat internally of said valve body about said inlet opening for receiving said valve element in close seated contact thereon, stop means internally of said body adjacent said outlet opening to limit the displacement of said valve element whilst permitting fluid passage from said inlet opening to said outlet opening about said valve element, horizontally disposed support means for connecting said outlet opening to a vacuum system with said passageway being in communication with a vacuum chamber, and adjustment means between said valve body and said horizontally disposed support means to control the angular position of said long axis of said valve body with respect to the vertical to vary the vertical weight component of said valve element and thereby regulate the amount of vacuum required to cause said valve element to be displaced off its seat.
In a suction box for use in a paper making machine and having a supporting surface for extracting water from pulp stock passing thereover and means creating a vacuum connected to said box, the improvement comprising an automatic adjustable bleed valve adjustably connected to said suction box to control the vacuum pressure in said suction box, said bleed valve comprising a valve body having means defining a lower inlet opening and an upper outlet opening with a passageway interconnecting said inlet and outlet openings, said valve body having a long axis, a displaceable gravity actuated valve element mounted for guided movement in said passageway, a valve element seat internally of said valve body about said inlet opening for receiving said valve element in close seated contact thereon, stop means internally of said body adjacent said outlet opening to limit the displacement of said valve element whilst permitting fluid passage from said inlet opening to said outlet opening about said valve element, said outlet opening being connected to said means creating a vacuum in said box wherein said passageway is in communication with a vacuum chamber and adjustment means to control the angular position of the long axis of said valve body with respect to the vertical to vary the vertical weight component of said valve element and thereby regulate the amount of vacuum, in said chamber, reguired to cause said valve element to be displaced off its seat.
A method of controlling vacuum pressure in a suction box for a paper making machine comprising the steps of:
- i. applying a vacuum to said suction box,
- ii. connecting an adjustable automatic air bleed valve to said suction box to admit air in said box when vacuum pressure in said box exceeds a desired value, said bleed valve having an angularly displaceable valve body having a long axis, and
- iii. adjusting the angular position of the long axis of said bleed valve with respect to the vertical to adjust its sensitivity and capacity to permit said admission of air at said desired value.
Dependencies are inferred from the claim text.