If you are working with an application dealing with sanitary fluid process, then you need to know thoroughly about the valves used in your system. Quite often, you may consider certain valve as your sanitary valve however, in fact it is not the right choice for cleanliness. Such topic can always become a controversial one, but we are going to discuss only about those valves which are good for any sanitary applications, and those which you must avoid.
In general, valves which has very high internal polish with no internal cavities can be the best for any sanitary applications. Majority of sanitary applications may involve certain thick viscous fluids or solids hence it is essential to create the path of flow smoothest. The valve connection must be mating with the piping uniformly with any weld, clamp or gasket style connections.
Sanitary valve types
Butterfly valves are one of the very common sanitary replacements parts for sanitary applications as it lacks any internal voids or cavities. Internal cavities can promote product buildup, that will result in any bacterial contamination. Due to absence of such cavities any butterfly valve will allow you to eliminate contamination, and makes it a better sanitary valve option.
Any single-seated and double-seated valves are also a good sanitary option. They are valves of linear plug-style having canister-style cylindrical actuators. Plug design of this valve eliminates the disc on the flow path. Also, this can avoid contamination. It is easier to clean the actuators than any industrial style rack-and-pinion type of actuator.
Mix-proof valves are also able to run two products simultaneously, functioning as two separate valves. Such dual-acting seats will avoid cross contamination and spillage.
For any pharmaceutical sanitary applications, any diaphragm valve is very good option. As there is nothing present in flow path, it is easily sterilized and sanitized. As compared to any single-seated valve, it is much more cost-effective. For any extreme applications, a ZDL diaphragm valve is completely drained for avoiding trapped media.
Good characteristics of sanitary valve
While selecting any sanitary valve, you must look for following characteristics:
- Ability of cleaning while piped inline
- Clamp connections or in case welded, it is easily removed from piping
- Connections evenly mated with piping
- Easily be disassembled for cleaning
- Metals and elastomers shall not interfere with the product/media
- No internal cavities
- Smooth unobstructed path of flow