Membranes and neighboring members in pumps, compressors and devices

A pump, comprising, in combination a first body 1 with at least one inlet valve, at least one outlet valve and an inner chamber 37, a second body 91 with a piston reciprocable in a cylinder with said cylinder communicated to an outer chamber 35 in said second body and a chamber separation member between said bodies and said chambers,

• wherein said separating member is a radially planar ring 1520 with an inner radius "r" and an outer radius "R",
• wherein said ring has a radial inner portion radially inwards of its medial portion and a radial outer portion radially outwards of said medial portion,
• wherein said first and second bodies form radial planar axial end faces,
• wherein said end faces are distanced from each other by a distance ring 1537 of a first axial thickness,
• wherein said radially planar ring has a second axial thickness,
• wherein said second axial thickness is slightly shorter than said first thickness,
• wherein seal beds are provided in said end faces and flexible seal rings 1538 and 1529 are inserted into said seal beds,
• wherein said radial outer portion of said radially planer ring is inserted between said end faces and radially inwards of said distance ring with a clearance 1522 formed between said outer radius "R" and the inner diameter of said distance ring 1537,
• wherein said radial outer portion extends radially outwardly beyond said seal beds and said seal rings,
• wherein said radial inner portion of said radially planer ring is subjected to closing of the inner bore of said radially planer ring by an interior closing device,
• wherein said interior closing device is formed by two rings 1523 and 1524 with an inner distance ring 1530 between them with an axial thickness equal to said first thickness,
• wherein seal beds with therein provided elasticly deformable seal rings 1526 and 1527, are formed in said two rings,
• wherein said radial inner portion of said radial planar ring 1520 is inserted between said two rings,
• wherein a clearance 1521 is formed between the radial inner diameter "r" of said radially planar ring and the outer diameter of said inner distance ring, and,
• wherein the radial inner portions of said two rings are clamped together by an inner ring 1525 which forms clamping portions 1531 which axially and radially partially embrance said inner portions of said two rings.