It is a point of concern that many Spray Dry Nozzles in service today are not only old variants, possibly way past their safe service life, exceeding their maximum recommended pressure capability, or more commonly will typically utilise an old inferior body sealing method were a Clearance (Gap) Radial Seal type, Plug in Socket Seal Gland using a singular O-ring body seal providing the primary pressure seal that is simply not conforming to known modern sealing conventions and standards.
It is readily determined today that modern sealing standards and technology limit significantly the operational pressures that such singular radial O-ring seal glands using the necessary working clearances (gaps) required for damage free, daily assembly and disassembly. It is an increasing problem that these pressure limits are well below those pressures normally required in the modern Spray Drier.
This problem in the short term may be resolved with the use of Radial Seal Back-up rings, but it is well known to opertors with Back-up ring experience, that in using Back-up rings for increased pressure capacity and integrity, they have also discovered major service limitations, complications and cost drawbacks in Radial Seal systems that are required to be assembled and disassembled daily.
Click & Dry sealing glands require no backup rings to satisfy most known potential pressure spike conditions.