PS-SEAL® – PRODUCT SHEET
The PS-SEAL® product line stands for reliable sealing of rotating shafts at high circumferential speed, high pressure and extreme temperatures. Abrasive media is sealed as good as aggressive media. Usual radial shaft seals are only partially or even not usable at all under these conditions, as their seal lips are made of elastomeric materials.
PS-SEAL®s are usable in many different applications and can also be an alternative to mechanical seals and braided packings. The product line PS-SEAL® offers cost-effective and practical solutions to a wide range of applications. The portfolio of Garlock shaft seals offers standardized as well as special customized seals.
The high performance seals PS-SEAL® work with a sealing lip made of GYLON® or other modified PTFEs. Garlock produces GYLON® in a process that has been specially developed.
PS-SEAL® – Rotary Shaft Seals
- Useable under high pressure and in extreme vacuum
- Very suitable for high circumferential speed
- Temperature resistant from -90 °C up to +260 °C
- Excellent chemical resistance
- Useable in food and pharma applications (FDA)
- EN 1935/2004 certificate
- SIP/CIP compatible
- Good dry running capability
- Wear resistant and low friction
STANDARD CONFIGURATIONS & DIMENSIONS
PS-SEAL® Standard is a Garlock shaft seal consisting of a stainless steel (1.4571) case, a GYLON® Black seal lip and a static sealing element
made of FKM.
Garlock PS-SEAL® Non-Standard are shaft seals in standard sizes with different configurations of their seal lips and different materials.
A single lip points out of the housing towards the media.
The success of this design is astounding:
The dead space is reduced by almost 80%, which has an extremely positive effect on cleaning and significantly reduces possible contamination. A clear plus in daily use.
Back to Back
Two lips seal equally on both sides.
Safe separation of two media is also possible – and this with only one seal. Where two shaft seals would otherwise have to be used back to back, this task is accomplished by a PS-SEAL® Non-Standard in back-to-back design – and with only the smallest installation width.
Single lip with dust lip
The seal lip sits in the housing as standard, and is supplemented by a dust lip facing towards the dry side.
If the working environment is contaminated with dust, the PS-SEAL® Non-Standard can also be equipped with a dust lip. Here, the suitability of the PS-SEAL® lips for dry running is particularly exploited, thus increasing the performance of the seal.
Two seal lips towards the media.
If longer service life is required or if even greater plant safety is desired, a PS-SEAL® Non-Standard Tandem is a good choice. With the smallest installation width, two seal lips are now available instead of just one.
The used GYLON® lip materials guarantee a stopped cold flow with brilliant running characteristics when it comes to impermeability, abrasion and frictional heat. Many different compounds can be used for different applications. To deal with rising demands in terms of rotational speed and pressure in lubricated – as well as in dry running conditions. A higher operating safety and a longer service life can be reached by using multiple lip-seals arrangements. Please feel free to contact us for individual consulting.
An excellent PTFE/graphite based material suitable for lubricated applications. Not made for dry running and not suitable for food & pharma applications.
Due to the white color a popular material in the food & pharmaceutical industries (with important certificates EC 1935, USP Class VI, FDA etc.), but also in the production of paints. The lip basis is a PTFE with barium sulfate, giving excellent gas tightness. The suitability for dry running is good, but the circumferential speed should be low, because the friction temperature can rise quickly.
Garlock’s top solution in the food & pharmaceutical sectors having important certificates EC 1935; USP Class VI; FDA etc. Also ideal for larger shaft deflections on mixers and agitators. Excellent in dry running and with good gas tightness. However, abrasive media may cause problems for the PTFE/microspheres material.
A cleverly combined PTFE material for abrasive applications in the food industry. The brown side of the lip contains abrasive-resistant additives, the white side heat-dissipating additives. This gives longer running hours with less down-time, and improves the operating process. Of course with FDA and EC 1935 conformity.
Material F Beige
Not a GYLON®, but a precisely designed material based on PTFE Ekonol. Specially designed for dry running, it shows its strengths there. High speeds can be run with low frictional heat. It is well suited for CIP and SIP processes in the food industry. Its excellent gas tightness in vacuum applications is also highly appreciated. However, in order to benefit from its advantages, it requires precise shaft concentricity.
Material MS Grey
A material developed with the hardest glass that scores excellently with abrasive media even without a GYLON® matrix. Optimal for dry running in the environment of abrasive powders and dusts. It also offers high pressure resistance with low wear. It is often combined in tandem with the other lip materials to increase its performance with low-viscosity media or gases.
The standard material for the PS-SEAL® seal case is stainless steel 1.4571. Other materials can be supplied on request.
» PS-SEAL® Standard max. 10 bar
» PS-SEAL® Non-Standard max. 25 bar (depending on version)
» PS-SEAL® Special max. 25 bar (depending on version)
» PS-SEAL® Lip max. 25 bar (depending on version)
» PS-ProSet® max. 25 bar (depending on version)
For maximum pressure applications please check the p x v – value. Garlock recommends an axial fixation of the PS-SEAL® when it is used in applications under high pressure.
The PS-SEAL® lip material can handle temperatures between –90 °C and +260 °C. Please note, that there is a difference between the temperature on the seal and the process-temperature due to the friction which releases additional energy/heat.
GYLON® is being used as lip seal material of PS-SEAL® and significantly responsible for its successful operation. We offer highly diverse seal options and combinations of materials to cope with the very different requirements of many diverse industrial branches. GYLON® is a modified PTFE and is used due to its high chemical resistance, its high temperature range and its low friction.
As the counter surface has a major impact on the efficiency and life-time of our seals, its configuration needs also to be considered. Garlock can offer an appropriate package of seal and counter surface (protection sleeve) to provide an optimal and durable sealing solution. For an optimal interaction between sealing and abrasion the following surface characteristics should be complied with:
Ra = 0,1 – 0,4 μm
Rz = 0,6 – 2,0 μm
Rmax = 4 μm
The running surface may not have a helical spiralling indentations as the arising conveying effect could cause leakage.
Under high stress (p x v – value) of more than 20 bar x m/s Garlock recommends an untwisted machined chromium oxide coating. Suitable coatings can be ordered from Garlock. Please consider a hard enough basic material when using micro-coatings.
PS-SEAL® shaft seals must be installed without damage.
Therefore never insert over sharp edges! The use of a common mounting paste makes installation easier.
1. R min 1 mm and polished
2. Shaft-ø minus 5 mm
3. Shaft-ø plus 0,4 mm
Please have a look at installation video.
PS-SEAL® – Snack Production Process | (English) | (Deutsch)
PS-SEAL® – Food Mixer | (English) | (Deutsch)
PS-SEAL® – Food & Pharma Mixer | (English) | (Deutsch)
PS-SEAL® – Bulk Handling Systems | (English) | (Deutsch)
Letter of conformity EC1935/2004, EC10/2011 | (English)
Declaration FDA Conformity PS-SEAL | (English) | (Deutsch)
Declaration of Conformity FDA – Coating | (English) | (Deutsch)
Certificate TA-Luft for lip material F with barrier | (English) | (Deutsch)