Double Seal Valves

 VARIVENT^® single seat shut-off valves
The valves are used for simple shut¬off at flow path intersections within the pipe system. One seal is used on the one-part valve disk for shutting-off two pipes against each other. In case of sealing failure, controlled leakage drain is not provided.


VARIVENT^® double seal valves type C

The valves have a one-part valve disk with a double seal. They are used for mixproof separation of incompatible media at flow path intersec¬tions within the pipe system. Double seal valves are the economical alternative to the generally used double-seat valves. The valve's isolation chamber is equipped with two rinsing valves which are provided for leakage detec¬tion and cleaning of the iso¬lation chamber itself. It is possible to clean the isolation chamber both separately and during pipe cleaning.


VARIVENT^® mixproof valves type R

The valves are used for mixproof separation of incompatible media at flow path intersec¬tions. In the closed position of the valve (non-actuated position) always two seals are located between the two pipes.Due to its radial arrange¬ment of the seals, the valve is switching leakage-free. If one of the seals fails, lea¬kage may directly drain to the open via the therefore provided leakage outlet of the valve without inter¬mixing with the product being in the second pipe.


VARIVENT^®mixproof shuttle valves type Y
The valves are used for diverting liquids in a pipe system, i.e. from one pipe on to two pipes, with mixproof separa¬tion between the central and the upper pipe.
In the closed position of the valve (non-actuated posi¬tion) always two seals are located between the two pipes (shut-off between cen¬tral housing and upper hou¬sing). If one of the seals fails, leakage may directly drain to the open via the therefore provided leakage outlet of the valve without inter¬mixing with the product being in the second pipe. For shut-off between the central and the lower valve housing, only one seal is used.
The VARIVENT^® mixproof shuttle valve has been tested and approved by the Dairy Institut in Kiel, Germany.



VARIVENT^® mixproof tank bottom valves type T

The valves are used for mixproof shut-off between the tank and the pipe system. In the closed position of the valve (non-actuated position) always two seals are located between the pipe and the tank. If one of the seals fails I leakage may directly drain to the open via the therefore provided leakage outlet without intermixing with the product being in the second pipe.