<p>The non-return valve (5) has a housing (9) comprising a fluid flow passage (10) in which a guide pin (13) is extended. Several retaining bars (19) are arranged axially in a passage opening (18) of fluid flow passage. A valve structure (15) is provided with a guide sleeve (16) that is guided on guide pin. The valve structure is axially adjustable between closed and open positions. A control plate (17) of valve structure is arranged at opening edge (20) so as to axially close passage opening during closed position. The control plate is rested on retaining bars during open position. An independent claim is included for pipe connector.</p>
