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1. WO1991006797 - VANNE A BOISSEAU SPHERIQUE ET PROCEDE DE FABRICATION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A valve for a fluid distribution system comprising a spherical plug coupled to a control stem, a pair of tubular coupling members at opposite sides of the
spherical plug and sealing rings placed between the control stem and the spherical plug and between the spherical plug and the tubular coupling members,
characterized in that it also comprises a casing of a plastic material which forms the valve body and encloses therein said spherical plug, at least a portion of said tubular coupling members, a portion of said control stem adjacent to the spherical plug and said sealing rings, thereby maintaining said enclosed valve members in
position and forcing the same against each other with a predetermined pressure to ensure sealing without impairing the plug movements.
2. A valve as claimed in claim 1, characterized in that the inside surface of said body contacts the outside surface of said valve members on the entire area thereof.

3. A method for manufacturing a valve as claimed in claims 1 and 2, characterized in that it comprises the steps of placing the valve members, arranged in the relative positions which they are intended to take in the finished valve, on valve member bearing means of a die of a press for injection molding plastic materials, wherein said die comprises two separate portions and has a cavity therein having an overall shape complementary to the external shape of the valve and a size to leave a gap between the cavity walls and the exposed surfaces of the valve members; closing the die; injecting a moldable plastic material into said gap to fill entirely said gap; and hardening said plastic material; the hardened plastic material forming a valve body enclosing said valve members.
4. A method as claimed in claim 3, characterized in that the axial dimensions of the cavity are so selected that, when closing the die, the cavity walls impart a first compression to the ends of said tubular coupling members, wherein the final compression required for providing the valve sealing is obtained by the contraction of the plastic material during setting.
5. A valve for a fluid distribution system comprising a body, which includes a spherical plug coupled to a control stem, a pair of tubular coupling members at opposite sides of the spherical plug and sealing rings placed between the control stem and the spherical plug and between the spherical plug and the tubular coupling members,
characterized in that said body and said tubular coupling members are made of a single portion of a plastic material which encloses therein said spherical plug, a portion of said control stem adjacent to the spherical plug and said sealing rings, thereby maintaining said enclosed valve members in position and forcing the same against each other with a predetermined pressure to ensure sealing without impairing the plug movements.

6. A method for manufacturing a valve as claimed in claim 5, characterized in that it comprises the seeps of placing said spherical plug, said control stem and said sealing rings, arranged in the relative positions which they are intended to take in the finished valve, on valve members bearing means which are provided in a die of a press for injection molding plastic materials and have portions of their surfaces which have shapes complementary to the shapes of the inside surfaces of said tubular coupling members, wherein said die comprises two separate portions and has a cavity therein having an overall shape
complementary to the external shape of the valve and a size to leave a gap between the cavity walls and the exposed surface of the valve members; closing the die;
injecting a moldable plastic material into said gap to fill entirely said gap; and hardening said plastic
material; the hardened plastic material forming a valve body enclosing said valve members.
8. A valve as claimed in claims 1, 2, or 5, characterized in that said plastic material is glass-filled nylon.
9. A method as claimed in claim 3, 4 or 6, characterized in that said plastic material is glass-filled nylon.

AMENDED CLAIMS
[received by the International Bureau on 26 March 1991 (26.03.91);
original claims 5 and 6 cancelled; original claims 1,4,8 and 9 amended;
other claims unchanged (2 pages)]

1. A valve for a fluid distribution system comprising ? spherical plug coupled to a control stem, a pair of tubuLar metallic coupling members at opposite sides oϊ thf- spherιca_ plug and sealing rings placed between the control stem and the spherical plug and between the spherical plug and the tubular metallic coupling members, characterized in that it also comprises a casing of a plastic material which for fc the valve bod;, and enclose? therein said spneπcal plug, at least a portion of said tubular metallic coupling members, a portion of said control stem adjacent to the spherical plug and said sealing rings, thereby maintaining said enclosed valve members in position and forcing the same against each other with a predetermined pressure to ensure sealing without impairing the plug movements.
2. A valve as claimed in claim 1 , characterized in that th<= inside surface of sand boαy contact? th- outsiαe surface cf said valve members on the entire area thereof.
3. A method for manufacturing a valve as claimed in claims 1 and 2 , characterized in that it comprises the steps of placing the valve members, arranged in the relative positions which the are intended to take in the finished valve, on valve member bearing means of a die of a press for injection molding plastic materials, wherein said die comprise"-, two separate portions and has a cavity therein having an overall shape complementary to the external shape cf the valve and a size to leave a gap between the cavity walls and the exposed surfacer- of the valve members-; closing the die: injecting a moldable _ _

plastic material intt saiα gap to fill entirely said gaj. ; anc hardening said plastic material: the hardened plastic material forming a valve body enclosing said valve members.
4 . A method as claimed in claim 2, charact rized in tha; the axial dimensions of the cavity are so selected that, when closing the die, the cavity walls impart a first compression to the ends of said tubular metallic coupling members, wherein the final compression required for providing the valve sealing is obtained by the contraction o f the plastic materiai during setting.
5. A valve as claimed in claims, 1 or 2, characterized in that said plastic material is glass-filled nylon.
6. A method as claimed in claim or -_ * characterized in that said plastic material is glass-filled nylon.