Automatic ring valve shutters for automatic ring valves and method for manufacturing said shutters
An automatic ring valve comprising a valve seat provided with a plurality of gas flow passages arranged according to at least one annular row, at least a shutter comprising at least one ring-shaped portion for selectively closing and opening the gas flow passages, wherein the ring-shaped portion of the shutter comprises a fiber-reinforced matrix, at least one contrasting member for contrasting an opening movement of ring-shaped portion of the shutter, wherein the ring-shaped portion of the shutter comprises continuous fibers, at least some of the fibers developing for at least 360° of the annular development of the ring-shaped portion.
1. An automatic ring valve comprising:
a valve seat provided with a plurality of gas flow passages arranged according to at least one annular row,
at least a shutter comprising at least one ring-shaped portion for selectively closing and opening the gas flow passages, wherein the at least one ring-shaped portion of the shutter comprises a fiber-reinforced matrix, and
at least one compressing spring for contrasting an opening movement of the at least one ring-shaped portion of the shutter,
wherein the at least one ring-shaped portion of the shutter comprises continuous fibers, at least some of the continuous fibers forming at least 360° of the ring-shaped portion and wherein the at least one ring-shaped portion is a portion cut from a part of a one-piece product comprising a plurality of coaxially arranged ring-shaped portions, wherein the at least one-piece product has a broadly cylindrical shape.
2. The automatic ring valve according to claim 1 , wherein the matrix has a layered structure.
3. The automatic ring valve according to claim 1 , wherein the fiber-reinforced matrix is formed by wound portions of at least one flexible element comprising the continuous fibers forming in the direction of the continuous flexible element, wherein the wound portions are bonded together.
4. The automatic ring valve according to claim 1 , wherein the continuous fibers surround a central axis of the at least one ring-shaped portion of the shutter.
5. The automatic ring valve according to claim 1 , wherein the continuous fibers are arranged in a substantially inclined development with respect to the axis of the ring-shaped portion.
6. The automatic ring valve according to claim 1 , wherein the continuous fibers are arranged in a substantially spiral development about the center of the ring-shaped portion.
7. The automatic ring valve according to claim 1 , wherein the continuous fibers are overlapped according to an orthogonal direction with respect to an axis of the ring-shaped portion.
8. The automatic ring valve according to claim 1 , wherein the quantity of the continuous fibers is comprised between 30% and 80% by weight on the total weight of the ring-shaped portion.
9. The automatic ring valve according to claim 1 , wherein the linear thermal expansion coefficient of the ring-shaped portion, in the same direction of the fibers, is comprised between 0.05×10 −6 PC and 10×10 −6 /° C.
10. The automatic ring valve according to claim 1 , wherein the matrix comprises a polymeric resin.
11. The automatic ring valve according to claim 10 , wherein the matrix comprises a polymeric resin of thermoplastic or thermoset type.
12. The automatic ring valve according to claim 10 , wherein the polymeric resin is chosen from the group comprising Polyetheretherketone (PEEK), Polyaryletherketones (PAEK), Polyphenylene Sulfide (PPS), Polysulfone (PSU), Polyphenylene Sulfide (PPS), Polyamide (PA), Polyphthalamide (PPA), Polyamide-Imide (PA I), Polyethylene (PE), Polycarbonates (PC), Polyetherimide (PEI), Polytetrafluoroethylene (PTFE), Polyimide (PI), Polybenzimidazole (PBI), or Epoxy Resins.
13. The automatic ring valve according to claim 1 , wherein the continuous fibers are chosen from the group comprising glass fibers, E-glass fibers, ECR-glass fibers, S-glass fibers, carbon fibers, STD carbon fibers, IM carbon fibers, HM carbon fibers, UHM carbon fibers, aramid fibers.
14. The automatic ring valve according to claim 1 , wherein the shutter is made in one piece and comprises a plurality of coaxially arranged ring-shaped portions and a plurality of transversal connections joining the ring-shaped portions to one another.
15. A reciprocating compressor comprising an automatic ring valve, wherein the automatic ring valve comprises:
a valve seat provided with a plurality of gas flow passages arranged according to at least one annular row,
at least a shutter comprising at least one ring-shaped portion for selectively closing and opening the gas flow passages, wherein the at least one ring-shaped portion of the shutter comprises a fiber-reinforced matrix, and
at least one compressing spring for contrasting an opening movement of the at least one ring-shaped portion of the shutter,
wherein the at least one ring-shaped portion of the shutter comprises continuous fibers, at least some of the fibers forming at least 360° of the ring-shaped portion and wherein the at least one ring-shaped portion is a portion of a part of a one-piece product comprising a plurality of coaxially arranged ring-shaped portions, wherein the at least one-piece product has a broadly cylindrical shape.