Kalsi is among the best producers of high pressure shafts which are used by most industries. That said, it’s important to note that high pressure seals are greatly dependent on a number of factors such as the extrusion gap clearance, the type of seal used, temperature, rotary speed, required seal life and the degree of available heat transfer. With the use of the best seal carrier design practices, the plastic lined high pressure shaft seal has been tested against the hollow rotating wash pipe for 1000 hours. Even at such pressure levels the rotary pipes still operate in excellent condition.
Pressure-retaining seals and partitioning seals
The kalsi-brand shaft seals can withstand high-pressure capacity since they are hydroplane on the lubricant field. To be able to effectively explore this phenomenon, one of the kalsi seal sides is often exposed to the lubricating oil. In a more traditional implementation, the seals lubricants are pressurized to a value which is equal or greater than the pressurized media. In such instances, the seal facing the pressurized media is referred to as partition media because it acts as a barrier between the lubricant and pressurized media.
This traditional set-up makes use of rotary seals which are meant to be exposed to the differential temperature acting on either side. In most cases, this requires pressurized lubricant supply that is not either economical or practical. In order to have a simplerimplementation in place, kalsi has come up with the special; hydrodynamic seals which operate under lubricant pressure that is 500 psi less than the normal pressurized media.
The advantage of these seals is that they make use of gravity fed lubricant reservoirs. As much as the two seals play a role In ensuring that they retain the lubricant, the outbound seal can still be a radial lip seal. On the other hand, a lot of rotary equipments make use of bearings protected by seals therefore the need for an outboard seal is never a requirement. Even so, kalsi engineering still continues to make strides in this area and in due time they will be able to come up with products that are able to operate under 1,000 psi pressure.
Materials best suited to operate under high differential pressure.
The kalsi seals come in different high-pressure shaft seals and a variety of materials. In partnership with the proprietary 303 plastic lined seals construction, they now have an advanced lubrication seal geometry that enables them provide high quality pressure rotary seals that both come with -307 and -308 plastic lining construction with a pressure capacity within the same range. There is also an all-elastomer material combination which is mostly used for high differential pressure services.Mostof the dual durometer seals have got dynamic lip that is constructed of the -18 material (95 Shore A HNBR).There is also the -15 material ( 90 Shore A HNBR) which is the next material in the order of extrusion resistance. You can also get more information in kalsi website on the various geometries and seal materials as well as the procedures on how to implement the seals in the machinery.