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Double seat piggable valves are used to safely process two different fluids efficiently (typically product and CIP) through the valve simultaneously.听听The DP4 mixproof design has two independently operating seats that separate the upper and lower pipeline when the valve is in the fail safe closed position.听听The atmospheric vent cavity between the seats creates a path to exit through the leakage chamber should the seals fail, as well as a drain for CIP solution during seat cleaning. External CIP spray flush connections are included to provide enhanced cleaning of the leakage vent cavity as well as the lower shaft, while the valve is closed or open during production.

Product in Blue:

听

听

听

The lower and upper valve shafts are in closed position and safely separate the different liquids A and B. The leakage chamber L, which is situated between the two valve shafts, provides for a free and depressurized discharge to the drain housing. The lower valve shaft is balanced and, thereby, protected against pressure hammer.

Valve Open:

听

The middle seal in the upper valve shaft is pressed against the lower valve shaft by control of the actuator. First, the leakage chamber L is closed against the product chamber. Then the two valve shafts move downwards into the open position. The connection between pipelines A and B is established.