# US 8,739,828 B2 · Double seat valve for separating media > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,828 B2 - Document ID: US8739828B2 - Status: Granted - Kind: B2 - Application number: 13/828,175 - Filed: 2013-03-14 - Published: 2013-08-01 - Granted: 2014-06-03 - Earliest claimed: 2010-09-14 - Assignees: Südmo Holding GmbH - Applicants: Frank Neuhauser; Werner Deger; Karl Welchner - Inventors: Frank Neuhauser; Werner Deger; Karl Welchner - Web page: https://patentgrep.com/patent/US8739828B2 ## CPC - F16K 1/443: {the seats being in series} - F16K 1/446: {with additional cleaning or venting means between the two seats} - Y10T 137/4238: With cleaner, lubrication added to fluid or liquid sealing at valve interface - Y10T 137/5762: With leakage or drip collecting - Y10T 137/88038: One valve head carries other valve head - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A double seat valve for separating media includes a housing having a first connector for a first pipeline and a second connector for a second pipeline, a first closing member of the first connector and a first closing member seat assigned thereto, the first closing member in closed position cooperating in sealing manner with the first closing member seat via at least one sealing element, a second closing member of the second connector axially spaced from the first closing member, and a second closing member seat assigned to the second closing member, the second closing member in closed position cooperating in sealing manner with the second closing member seat via at least one sealing element. The two closing members can be lifted independently of one another from their respective closing member seats. A leakage space is also provided between the two closing members and discharges into a leakage outlet. ## Claims ### Claim 1 A double seat valve for separating media, comprising a valve housing having connectors for a first pipeline and a second pipeline, a first closing member, a first closing member seat, and at least one first sealing element, a second closing member axially spaced from the first closing member, a second closing member seat axially spaced from the first closing member seat, and at least one second sealing element, the first and second closing members being able to be lifted independently of one another from the first and second closing member seats, a leakage space arranged between the first and second closing members and discharging into a leakage outlet, a flow barrier element arranged between the first and second closing members for shadowing, when the first closing member is lifted, at least one of the second sealing element and the second closing member seat against direct impingement by a medium fed into the leakage space, and for shadowing, when the second closing member is lifted, at least one of the first sealing element and the first closing member seat against direct impingement by a medium fed into the leakage space, the flow barrier element having an annular body, which divides, when one of the first and second closing members is lifted, together with said one of the first and second closing members the leakage space into a first leakage space portion and a second leakage space portion, the annular body being configured for a passage of medium through the annular body from the first leakage space portion into the second leakage space portion such that a second pressure in the second leakage space portion is reduced compared to a first pressure in the first leakage space portion, the medium reaching the leakage outlet from the second leakage space portion. ### Claim 2 (depends on 1) The double seat valve of claim 1, wherein, when medium passes from the first leakage space portion into the second leakage space portion, the second pressure in the second leakage space portion is reduced substantially to atmospheric pressure at the leakage outlet or even to a pressure below the atmospheric pressure. ### Claim 3 (depends on 1) The double seat valve of claim 1, wherein the annular body has a radially extending annular body portion and an adjoining axially extending annular body portion, wherein, when one of the first and second closing members is lifted and the first leakage space portion is impinged by medium, the axial annular body portion contacts said one of the first and second closing members in a sealing manner. ### Claim 4 (depends on 3) The double seat valve of claim 3, wherein the axial annular body portion and said one of the first and second closing members have mutual edges engaging one another from behind such that the axial annular body portion contacts said one of the first and second closing members in a sealing manner. ### Claim 5 (depends on 1) The double seat valve of claim 1, wherein the flow barrier element is arranged loosely between the first and second closing members and axially movably relative to the first and second closing members. ### Claim 6 (depends on 1) The double seat valve of claim 1, wherein the annular body of the flow barrier element has a plurality of apertures, through which, when one of the first and second closing members is lifted, medium can pass from the first leakage space portion into the second leakage space portion, wherein at least one of the number and individual cross sections of the apertures is dimensioned such that the pressure in the second leakage space portion is substantially at atmospheric pressure or below atmospheric pressure when medium passes through the apertures. ### Claim 7 (depends on 6) The double seat valve of claim 6, wherein at least one of the first and second closing members has at least one drainage opening connecting the leakage space to the leakage outlet, and wherein at least one of the apertures in the annular body of the flow barrier element is aligned with the at least one drainage opening. ### Claim 8 (depends on 7) The double seat valve of claim 7, wherein the at least one drainage opening widens toward the leakage space. ### Claim 9 (depends on 1) The double seat valve of claim 1, wherein the flow barrier element is arranged between the first and second closing members in a manner secured against rotation. ### Claim 10 (depends on 1) The double seat valve of claim 1, wherein the flow barrier element has a seal for bearing against an interior wall of the housing. ### Claim 11 (depends on 1) The double seat valve of claim 1, wherein the flow barrier element has a sliding element for bearing against an interior wall of the housing. ### Claim 12 (depends on 1) The double seat valve of claim 1, wherein the flow barrier element bears directly against the housing, without an additional seal or sliding element. ### Claim 13 (depends on 1) The double seat valve of claim 1, wherein the annular body of the flow barrier element is not in sealing contact with either of the first and second closing members in a closed position of both, the first and second closing members. ### Claim 14 (depends on 1) The double seat valve of claim 1, wherein the annular body of the flow barrier element contacts both, the first and second closing members in a sealing manner in an open position of both, the first and second closing members. ### Claim 15 (depends on 1) The double seat valve of claim 1, wherein at least the annular body of the flow barrier element is manufactured from a plastics material. ### Claim 16 (depends on 1) The double seat valve of claim 1, wherein at least the annular body of the flow barrier element is manufactured from polyether ether ketone (PEEK).