Patent ID: 8622076
Filing Date: 2014-01-07
Classification: F16K,Y10T

Abstract:
1. A double-seat valve with two serially arranged closing elements ( 3 , 4 ), moveable relative to each other and designed as slide pistons, which prevent in the closed position of the double-seat valve ( 1 ) the overflow of fluids from one valve housing part ( 1 a ; 1 b ) into another ( 1 b ; 1 a ) through a connecting opening ( 2 c ) connecting the valve housing parts ( 1 a , 1 b ) with each other and which border both in the closed and open position of the double seat valve ( 1 ) a leakage cavity ( 9 ), which is connected with the double-seat valve ( 1 ) via a tubular shaft ( 4 b / 4 c ) arranged on a second closing element ( 4 ), in which a drainage hole ( 4 d ) is arranged, wherein an axially relocatable, cylindrical annular slide part ( 5 ) both in the closed as well as open position of the double-seat valve ( 1 ) is received in a sealing manner radially outward in a cylindrical third seat ( 2 b ), which is formed in a connecting opening ( 2 c ) connecting the valve housing parts together, and forms radially inward in a passage hole ( 5 i ) connected in a fluid-penetrable manner with the connecting opening ( 2 c ) a cylindrical first seat ( 5 e ), which runs coaxially to the connecting opening ( 2 c ), wherein in the closed position a first closing element ( 3 ) is received in a sealing manner in the first seat ( 5 e ), and in the course of its opening movement comes into sealing abutment with the second closing element ( 4 ), which is associated with a cylindrical second seat ( 2 a ) in the connecting opening ( 2 c ), and in a further opening movement the second closing element ( 4 ) is also transferred into an open position (H), wherein the first closing element ( 3 ) on a first end section ( 3 **) has a first seal ( 6 ), which radially seals in the first seat ( 5 e ), wherein the second closing element ( 4 ) on its end facing the first closing element ( 3 ) has a recess ( 4 f ) with a mainly cylindrical circumferential wall ( 4 h ) that is flush with the first seat ( 5 e ) and the recess ( 4 f ) is dimensioned to receive in a sealing manner the first end section ( 3 **) and a radial first seal ( 6 ) of the first closing element ( 3 ) during the opening movement before the second closing element ( 4 ) opens, each with a seat cleaning position for the closing elements ( 3 , 4 ) and the slide part ( 5 ) for the purpose of rinsing their coaxial seats ( 5 e , 2 a , 2 b ), wherein the second closing element ( 4 ) through a second partial lift (T 2 ) directed the same as the opening movement and the slide part ( 5 ) through a first partial lift (T 1 ) directed opposite the opening movement are transferrable to their respective seat cleaning position, wherein the second seat ( 2 a ) has a diameter that is smaller than the diameter of the third seat ( 2 b ) associated with the slide part ( 5 ), wherein a transition surface ( 2 e ) is provided between the second and the third seats ( 2 a , 2 b ) and wherein an annular, second recess ( 5 c ) includes a deflection surface ( 5 b ) is arranged in the front face of the slide part ( 5 ) facing the leakage cavity ( 9 ).