What are the differences between the PLAN32 and PLAN62 sealing and flushing solutions?

Both PLAN32 and PLAN62 are indeed flushing schemes for mechanical seals; their main difference lies in the source of the fluid used and the application scenarios. PLAN32 uses a cleaning fluid introduced from the pressure side of the pump or another reliable pressure source. After being treated by a cooler and a filter, this fluid is used to flush the sealing chamber of the mechanical seal through flow regulation and check valves. This flushing scheme is typically used to handle fluids containing solid particles, those that are prone to crystallization, or corrosive fluids. PLAN62 involves using a specific cleaning fluid (usually a gas) to clean and flush the mechanical seal when the pump is at rest, with the pressure of the cleaning fluid typically being maintained below the pressure in the device’s sealing chamber. It is commonly used to handle fluids that are prone to scaling, corrosion, or solidification. The reason why PLAN32 has a flow meter and a check valve in addition to PLAN62 is mainly that the flushing fluid in PLAN32 is liquid; a flow meter is needed to monitor the flow rate of this flushing fluid, and a check valve is required to prevent backflow of the fluid. The flushing fluid in PLAN62 is often gas, with relatively low pressure and minimal risk of backflow, so a check valve is generally not required. In general, the choice between PLAN32 and PLAN62 depends on various factors such as the properties of the fluid handled by the pump, the operating conditions of the pump, and environmental requirements. .

Different cleaning locations: 32 for the internal sealing surface, 62 for the external one

Take a close look at the colored areas in the image. In PLAN 32 injection flushing, the flushing fluid is introduced into the mechanical seal; it flows around the outer parts of the dynamic and static rings of the seal, carrying away the heat generated there. From there, it passes through the seal chamber and throat, then from the balance hole of the impeller to the inlet of the suction pump, where it mixes with the medium before flowing through the impeller’s flow channels and exiting from the pump. The flushing fluid is compatible with the medium and does not participate in any chemical reactions; it is suitable for use with media that contain particles, impurities, are highly viscous, toxic, or flammable and explosive. PLAN 62 involves introducing external flushing fluid or sealing gas between the primary and secondary seals of the mechanical seal, with the fluid exiting the seal through another hole in the seal cover. It is used in pumps that transport high-temperature liquids, serving to cool the back side of the mechanical seal and thereby cooling the rotating and stationary rings. Media such as ultra-cold water, hot nitrogen, and low-pressure steam are used for flushing purposes.

Looking at the color of the rinsing solutions for the two, there is a significant difference, indicating a distinction between the inner and outer parts.

Flush the interior of PLAN32, and flush the sealed end of PLAN62~~

Put the two PLAN32 PLAN62 together. It mainly depends on the display color of the rinse fluid: one is for the incoming process medium, and the other is for the outgoing fluid. This makes it very clear to distinguish them separately.

The main difference is that in the 32 configuration, it is the outer circumference of the end face that is flushed, allowing the flushing fluid to come into direct contact with the medium. While Plan 62 involves flushing the inner circular area of the end face, with the flushing fluid not coming into direct contact with the medium.

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