Valve component

Claim 2

A valve plate for a plate-type non-return valve comprising a central circular hub portion having a plurality of resiliently flexible guide arms extending therefrom and each connecting in a peripheral region of the plate with an associated one of a plurality of separate valve closure portions; each said guide arm having a curved portion in a central region of the plate extending from said hub portion at continuously increasing radial distance and leading to a radially extending portion which joins the valve closure portion in an outer peripheral region; each said closure portion being separated from adjacent closure portions by a radially extending slot and having main closure portions on each side of said generally radially extending portion.

Claim 3

A valve plate for a plate-type non-return valve including a plurality of discrete, spaced apart valve closure portions and a plurality or resiliently flexible guide arms each leading to a one of said valve closure portions and with each said guide arm having a continuously curved portion in a central region of the plate and extending from a central portion of the plate at continuously increasing distance relative to the center of the plate with said curved portion merging outwardly into a portion extending outwards; wherein the outwardly extending portion of each guide arm merges with the valve closure portion in an outer peripheral region of the valve closure plate; and wherein each valve closure portion has two valve closure portions extending inwardly; the edges of adjacent closure portions and guide arms defining spaces or passages whch extend from the outermost periphery of the plate to the central portion of the plate.

Claim 4

A valve plate for a plate-type non-return valve including a plurality of discrete, spaced apart valve closure portions and a plurality or resiliently flexible guide arms each leading to a one of said valve closure portions and with each said guide arm having a continuously curved portion in a central region of the plate and extending from a central portion of the plate at continuously increasing distance relative to the center of the plate with said curved portion merging outwardly into a portion extending outwards; wherein the outwardly extending portion of each guide arm merges with the valve closure portion in an outer peripheral region of the valve closure plate; and wherein each valve closure portion has two valve closure portions extending inwardly; the edges of adjacent closure portions and guide arms defining spaces or passages whch extend from the outermost periphery of the plate to the central portion of the plate.

Claim 5

A valve plate as claimed in claim 2 in whch the main body of the valve closure portion of each arm of the valve comprises two radially extending finger portions extending from the outer periphery, radially inwardly on either side of the radially extending portion of each guide arm.

Claim 6

A valve plate as claimed in claim 3 in which a radially extending slot is provided between the outer edges of adjacent radially extending finger portions of adjacent arms.

Claim 7

A valve plate for a plate-type non-return valve including a valve closure means and a plurality of curved, resiliently flexible guide arms leading to said valve closure means, characterised by the feature that the valve closure means comprise a plurality of discrete, circumferentially spaced apart valve closure portions and each one of the plurality of flexible guide arms leads from a central region of the plate to an outer peripheral region of the plate and leads to a respective one of said valve closure portions, with each said guide arm having a continuously curved portion extending at continuously increasing distance relative to the center of the plate, and wherein a plurality of continuous slots or passages each extend between adjacent valve closure portions from outwardly of the periphery of the plate to the central region of the plate.

Claim 8

A valve plate for a plate-type non-return valve including a valve closure means and a plurality of curved, resiliently flexible guide arms leading to said valve closure means, characterised by the feature that the valve closure means comprise a plurality of discrete, circumferentially spaced apart valve closure portions and each one of the plurality of flexible guide arms leads from a central region of the plate to an outer peripheral region of the plate and leads to a respective one of said valve closure portions, with each said guide arm having a continuously curved portion extending at continuously increasing distance relative to the center of the plate, and wherein a plurality of continuous slots or passages each extend between adjacent valve closure portions from outwardly of the periphery of the plate to the central region of the plate.

Claim 9

A valve plate for a plate-type non-return valve including a plurality of discrete, spaced apart valve closure portions and a plurality of flexible guide arms including spiral curved portions each leading to a one of said valve closure portions and in which each valve closure portion has two valve closure portions extending inwardly, and with each said guide arm having a continuously curved portion extending at continuously increasing distance relative to the center of the plate, the spiral curved portion of each guide arm is a compound curve, such as a volute, said continuously curved portion of each guide arm being in a central region of the plate and merging outwardly into a portion extending radially outwards, and wherein said radially extending portion of each guide arm merges with the valve closure portion in an outer peripheral region of the valve closure plate.

Claim 10

A valve plate for a plate-type non-return valve including a plurality of discrete, spaced apart valve closure portions and a plurality of flexible guide arms including spiral curved portions each leading to a one of said valve closure portions and in which each valve closure portion has two valve closure portions extending inwardly, and with each said guide arm having a continuously curved portion extending at continuously increasing distance relative to the center of the plate, the spiral curved portion of each guide arm is a compound curve, such as a volute, said continuously curved portion of each guide arm being in a central region of the plate and merging outwardly into a portion extending radially outwards, and wherein said radially extending portion of each guide arm merges with the valve closure portion in an outer peripheral region of the valve closure plate.

Claim 11

A valve plate as claimed in claim 6 in which the main body of the valve closure portion (7) of each arm of the valve comprises two radially extending closure (finger) portions (7') extending from the outer periphery, radially inwardly on either side of the radially extending portion (6) of each guide arm (4).

Claim 12

A valve plate as claimed in claim 7, in which a radially extending slot (8) is provided between the outer edges of adjacent radially extending finger closure portions (7') of adjacent arms (6).

Claim 13

A valve plate for a plate-type non-return valve in which a plurality of resiliently flexible guide arms extend from a central region via a continuously curved portion outwardly to an outer peripheral region of the plate and each guide arm merges in said peripheral region into a valve closure portion circumferentially spaced apart from and discrete from each adjacent valve closure portion, and wherein each said guide arm divides each valve closure portion so that each said valve closure portion extends inwardly from the peripheral region.

Claim 14

A valve plate for a plate-type non-return valve in which a plurality of resiliently flexible guide arms extend from a central region via a continuously curved portion outwardly to an outer peripheral region of the plate and each guide arm merges in said peripheral region into a valve closure portion circumferentially spaced apart from and discrete from each adjacent valve closure portion, and wherein each said guide arm divides each valve closure portion so that each said valve closure portion extends inwardly from the peripheral region.

Claim 15

A valve plate as claimed in claims 1 or 9, in which said plate is flat and said guide arms have at least portions which are each of spiral shape.