초록 ▼

A combined air vent and overpressure relief valve for a submersible pump includes a single tubular housing to be inserted in an opening in the upper end wall of a chamber on the outlet pressure side of the pump. The upper end of this housing has a vent hole therethrough, and inside the housing is an

A combined air vent and overpressure relief valve for a submersible pump includes a single tubular housing to be inserted in an opening in the upper end wall of a chamber on the outlet pressure side of the pump. The upper end of this housing has a vent hole therethrough, and inside the housing is an annular valve seat facing upwardly. A valve disk within the housing is proportioned to move lengthwise thereof toward and away from the valve seat but is normally biased into sealing engagement with the seat by a spring within the housing. This valve disk has a bleed hole therethrough, and a valve ball is caged in the lower part of the housing, below the valve seat for movement into and out of sealing engagement with the lower end of the bleed hole in the valve disk as the pressure within the chamber rises and falls. If that pressure exceeds the force of the spring holding the valve disk closed, the disk will be forced out of sealing engagement with its seat in the housing, thereby providing a flow path for liquid around the periphery of the disk to and through the vent hole in the upper end wall of the housing.

대표청구항 ▼

A combined air vent and overpressure relief valve assembly for installation in an opening in the upper end wall of a chamber to be filled with liquid under pressure, comprising: (a) a tubular housing proportioned for insertion in said opening in sealed relation with said wall, (b) said housing havin

A combined air vent and overpressure relief valve assembly for installation in an opening in the upper end wall of a chamber to be filled with liquid under pressure, comprising: (a) a tubular housing proportioned for insertion in said opening in sealed relation with said wall, (b) said housing having an upper end wall provided with a vent hole therethrough, (c) means within said housing forming an annular valve seat facing said upper end wall, (d) a valve disk within and proportioned to move lengthwise of said housing and including an annular portion proportioned for sealing engagement with said valve seat, (e) means for maintaining said valve disk out of sealing engagement with the inner surface of said housing to provide for flow of liquid past the periphery of said valve disk when said disk is out of engagement with said seat, (f) spring means in said housing for biasing said disk into sealing engagement with said seat, (g) said valve disk having a bleed hole therethrough, (h) a valve ball proportioned to seat in the lower end of and close said bleed hole, (i) a guide cage for said ball fixed in the lower end of said housing for retaining said ball in aligned relation with said bleed hole, (j) said cage being proportioned both to provide for travel of said valve ball into and out of sealing relation with said bleed hole while said valve disk is in said sealing engagement with said valve seat and to provide space for flow of fluid from within said chamber to said bleed hole when said valve ball is out of sealing engagement with said bleed hole, (k) said cage being open at the lower end thereof to expose said ball and the lower surface of said disk to fluid under pressure from said chamber, and (l) said ball and said valve disk constituting the sole members of said valve assembly which are movable with respect to said housing whereby following movement of said ball into seated and closing relation with said bleed hole, said valve and said disk are movable as a unit in response to pressure on the undersurface of said disk of sufficient magnitude to overcome said spring means.