Patent ID: 9175674
Filing Date: 2015-11-03
Classification: B05B,F04B

Abstract:
1. In combination, as tube member a valve member: the tube member having a tube inner wall defining therein an axially extending fluid passageway for flow of a fluid in an axial downstream direction therethrough, the tube inner wall having a tube upstream portion and a tube downstream portion, the tube downstream portion located in the downstream direction from the tube upstream portion, the valve member disposed within the passageway, the valve member comprising a spring member and a piston head member, the spring member having a spring first end and a spring second end, the spring member extending axially within the passageway from the spring first end to the spring second end, the spring first end coupled t the tube inner wall at a first location against relative axial movement with the tube member, the piston head member fixedly secured to the spring second end, the spring member being resilient and having an inherent bias to assume an unbiased position in which the spring second end is axially spaced from the spring first end by a distance equal to an unbiased length, the spring member deflectable from the unbiased position to biased positions in which the spring second end is axially spaced from the spring first end by distances different than the unbiased length, in moving from the unbiased position to the biased positions the spring second end is moved in the axial downstream direction relative the spring first end, piston head member having an axial downstream side and an axial upstream side, a pressure differential across the piston head member is measured as a pressure of the fluid in the passageway on the axial upstream side of the piston head member minus a pressure of the fluid in the passageway on the axial downstream side of the piston head member, the spring member deflectable from the unbiased position to a first of the biased positions when the pressure differential is equal to a first pressure level, the piston head member having a peripheral circumferential edge portion wherein when the edge portion of the piston head member is in the tube upstream portion engagement between the edge portion and the tube inner wall of the tube upstream portion prevents fluid flow axially therebetween, and when the edge portion of the piston head member is in the tube downstream portion interaction between the edge portion of the piston head member and the tube downstream portion permits fluid flow downstream therepast, wherein when the pressure differential is less than or equal to the first pressure level the edge portion of the piston head member is in the tube upstream portion and when the pressure differential is greater than the first pressure level the edge portion of the piston head member is in the tube downstream portion: the spring member comprising a tubular member having a wall member extending between the spring first end and the spring second end, the wall member having the shape of a solid of revolution rotated about the central axis, the wall member having a radially outwardly directed outer wall surface and a radially inwardly directed inner wall surface, at least one wall opening radially through the wall member from the outer wall surface to the inner wall surface, the tubular member being resilient having an inherent bias to assume an initial unbiased configuration of an unbiased length measured along the axial length, the tubular member resiliently deflectable to biased configurations, each having a length measured along the central axis loss than the unbiased length, the inherent bias of the resilient member biasing the tubular member to return towards the unbiased configuration from any one of the biased configurations, a reduction in the length of the tubular member as measured along the central axis corresponds to the outer wall surface increasing in convexity as seen in cross-sectional side view in flat planes including the central axis extending radially from the central axis.