Patent ID: 8739828

Claim:
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.