Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
A backflow check valve comprising: a housing (22) having a fluid inlet (34) and a fluid outlet (32); a biasable disk (24) carried within said housing for controlling fluid flow through said housing; and a valve seat (36) carried by said housing against which said disk is biasably urged; characterised in that said housing carries first (30) and second (36) disk-biasing means for engaging opposite sides of said disk (24) in such a manner that said disk is engaged along a first pair of spaced opposite portions thereof and said disk is engageable with said seat (36) along a second pair of spaced opposite portions thereof (77) intermediate said first pair of disk portions for precluding backflow of fluid through said housing.
Claim 2
Dependent Claim
122 words
A backflow check valve comprising: a housing (22) having a fluid inlet (34) and a fluid outlet (32); a biasable disk (24) carried within said housing for controlling fluid flow through said housing; and a valve seat (36) carried by said housing against which said disk is biasably urged; characterised in that said housing carries first (30) and second (36) disk-biasing means for engaging opposite sides of said disk (24) in such a manner that said disk is engaged along a first pair of spaced opposite portions thereof and said disk is engageable with said seat (36) along a second pair of spaced opposite portions thereof (77) intermediate said first pair of disk portions for precluding backflow of fluid through said housing.
Claim 3
Dependent Claim
20 words
A backflow check valve according to claim 1, characterised in that said seat (36) has an annular non-planar disk-engageable surface.
Claim 4
Dependent Claim
30 words
A backflow check valve according to claim 1 or claim 2, characterised in that said disk (24) is clamped to said seat (36) along said first pair of disk portions.
Claim 5
Dependent Claim
60 words
A backflow check valve according to any preceding claim, characterised in that said first disk-biasing means (30) has an edge (52) formed from two intersecting planar surfaces (54), and said second disk-biasing means (36) has a depression (48) into which said edge (52) is insertable so that said disk (24) is sandwiched between said edge (52) and said depression (48).
Claim 6
Dependent Claim
29 words
A backflow check valve according to claim 4, characterised in that said seat (36) has a concave cylindrical disk-engageable surface defining a valley whose nadir (48) forms said depression.
Claim 7
Dependent Claim
29 words
A backflow check valve according to claim 4 or claim 5, characterised in that said housing carries alignment means (60,62) for aligning said edge (52) with said depression (48).
Claim 8
Dependent Claim
28 words
A backflow check valve according any preceding claim, characterised in that said housing carries centering means (60,64) for centering said disk (24) with respect to said seat (36).
Claim 9
Dependent Claim
69 words
A backflow check valve according to any preceding claim, characterised in that said housing (22) includes a female portion (26) having a cavity (40), and further includes a male portion (28) having a projection (30) insertable into said cavity (40), said female portion (26) and said male portion (28) locating said disk (24) therebetween in an attitude generally transverse to a preselected direction of fluid flow through said housing.
Claim 10
Dependent Claim
26 words
A backflow check valve according to claim 8, characterised in that said female portion (26) and said male portion (28) are removably coupled to one another.
Claim 11
Dependent Claim
70 words
A backflow check valve according to claim 8 or claim 9, characterised in that said female portion (26) is integrally formed of a plastics material with said fluid inlet (34) and said seat (36), said male portion (28) is integrally formed of a plastics material with said fluid outlet (32) and said projection (30), and said disk (24) is integrally formed as a thin circular member of resiliently deformable material.