The basic function principle is pretty simple. As mentioned, the separate flow lines have two separate plug seals. The valve actuator mostly functions in the pneumatic method. When the valve is in open state, the atmospheric pressure between the two seals creates a leakage/containment chamber that works as a safeguard against any potential leakage from either of the pipelines. While extremely unlikely, in case of accidental leakage, the liquid will flow into this chamber and out through the leakage outlet instead of spilling into the other pipeline. When the valve is open, the leakage chamber remains closed, and thus maximum purity is ensured.
While not a part of the basic operation, the cleaning system that sanitary mixproof double seat valves generally feature has become standard due to its efficiency. The spiral cleaning system is used to decontaminate surfaces that require regular cleaning without raising the overall cost. The clean spiral medium can cover more surface (leakage chamber and plugs) at a consistent rate with minimal labor. Also, it also doesn’t require any manual association to reach awkward positions. It’s a very effective method to keep surfaces with too few scratches-per-inch or too many bumps and valleys clean and keep them free of contaminants.
Regardless of valve design, a sanitary mixproof double seat valve is mainly comprised of a body, plugs, actuator, and options for cleaning purposes. In addition, each valve also comes with an assortment of accessories that are specifically purposed for the operation it’s designed to perform.
The construction of these valves purposefully keep flexible to facilitate personal customization. This way, a single valve type can be modified and fitted to support operations that handle liquids with opposing viscosity. In addition, they also feature “Leakage detection holes.” Thanks to these, any damage to the 0-rings can be visually observed without dismounting and disassembling the valve.
The individual features of a double sealing valve can explain how it manages to keep the operation sterile while handling a larger sum of process media.
Based on the operation and purity requirements, sanitary mixproof double seat valves can be classified into the following categories: