HPS offers the widest possible selection of standard products plus custom components designed specifically for your application. Our products are manufactured from the full spectrum of manufacturing technologies such as compression molding of thermoset materials, injection molding of thermo plastics and both net molding and machining of engineered plastics.
From vacuum application to pressure of 10,000 PSI and beyond, "HPS has the solution".
Rod Seals
Hydra-pack Rod Seals
BSX HYDRA-PACK™
The ultimate in dry rod sealing, even at low temperatures and pressures, through the use of dual mechanically joined seal elements, which are designed to react independently to changes in system pressure.
BSI HYDRA-PACK™
The same dry rod seal technology that is used in the standard BSX Hydra-Pack plus a positively actuated rigid back-up for use in higher pressure and / or larger extrusion gap applications.
Loaded Lip U-Cups
DEEP X-RING LOADED LIP U-CUP
Manufactured from a range of thermoplastic and thermoset compounds and using a rubber quad shaped expander to provide memory to the seal contact points. - Standard non-beveled lip. - Rectangular cross section/profile for increased stability.
TYPE B "O" RING LOADED U-CUP
Similar in function to the "X" ring loaded lip u-cup, except using an o-ring expander to provide memory to the seal contact points.
Please contact us for product details
STANDARD X-RING LOADED LIP U-CUP
Manufactured from a range of thermoplastic and thermoset compounds and using a rubber quad shaped expander to provide memory to the seal contact points. - Standard non-beveled lip. - Square cross section/profile
TYPE B X-RING LOADED LIP U-CUP
Manufactured from a range of thermoplastic and thermoset compounds and using a rubber quad shaped expander to provide memory to the seal contact points. - Back beveled lip - Rectangular cross section/profile for increased stability.
SQUARE B X-RING LOADED LIP U-CUP
Manufactured from a range of thermoplastic and thermoset compounds and using a rubber quad shaped expander to provide memory to the seal contact points. - Back beveled lip - Square cross section/profile.
Z-SEAL
Top of the line loaded lip U-Cup with rubber sealing lip and TPU base for additional stability and enhanced extrusion resistance at low temperatures with high pressures.
Unloaded Lip U-Cups
"UBR" ROD TYPE HEEL STABILIZED U-CUP
An asymmetrical rod seal with a secondary seal contact on the I.D. to assist in with stabilization. and Manufactured from a variety of materials including the very latest in high performance polyurethane compounds.
"US" SYMMETRICAL U-CUP
Symmetrical rod and piston seals proven effective in a wide variety of applications and manufactured from a wide variety of seal materials.
"UNR" ROD ASYMMETRICAL U-CUP
A single acting rod seal which has long been used in light, medium, and heavy duty hydraulic cylinders.
Light Duty Rod U-Cups
8400 HOMOGENEOUS RUBBER U-CUP
A square cross section seal with a back beveled lip for increased sealability and film breaking.
Use gland dimensions pertaining to Unloaded or Loaded lip U-Cups. Please contact us for product details.
8500 HOMOGENEOUS RUBBER U-CUP
A square cross section seal, similar to the "8400" type (see Rod Seals) but without the back beveled lip and is often used as a piston seal.
Use gland dimensions pertaining to Unloaded or Loaded lip U-Cups. Please contact us for product details.Piston Seals
T Seals
CAPPED T-SEAL
A compact, bidirectional piston seal consisting of a filled PTFE cap, an elastomeric T-shaped energizer and rigid, positively actuated back-ups.
LOK HYDRA T-SEAL
Significantly reduces the possibility of the back-up rings being damaged during assembly and is available in narrow, intermediate, and wide base configurations.
AHT HYDRA T-SEAL
Eliminates the stress risers found in the sharp corners of the conventional T-seal by the use of a complementary radius and chamfer on the mating parts and available to retrofit one and two back-up o-ring grooves.
HT HYDRA T-SEAL
A compact, bidirectional seal proven to be extremely effective over a wide range of pressures, gaps, and fluids while retrofitting into a no back-up o-ring groove.
Cap Seals
RTPX CAP SEAL
Improves the sealability of PTFE cap seals by incorporating a more responsive elastomeric quad shaped ring into the dynamic sealing surface.
RTPS CAP SEAL
A square ring energized, rectangular cross section piston ring offering a wider seal footprint and improved stability than the STPO cap seal, while maintaining the availability of the full range of material selection.
STPO CAP SEAL
An o-ring energized, square cross section piston ring manufactured from a variety of high performance engineered plastics including numerous PTFE blends.
Crown Seals
CPB CROWN SEAL
Incorporates integral rigid back-ups to improve extrusion resistance while maintaining the increased stability of the CPW type crown seal.
CPW CROWN SEAL
Increases the axial length of the narrower CP crown seal and is designed to retrofit wider grooves, such as those used for Capped T-seals, while significantly improving stability.
CP CROWN SEAL
The narrowest of the crown seal family, retrofitting a no back-up o-ring groove while providing improved bidirectional sealing through the use of a rubber energized thermoplastic seal element.
Hydralock™ Assembly
HYDRALOCK™ ASSEMBLY
A unique concept that significantly reduces the possibility of catastrophic failure by using a uniquely designed glass filled nylon bearing/retainer that facilitates the use of pedestal configured multiple seal rings on a one-piece piston.
* Please contact us for product details and groove dimensions.Loaded Lip U-Cups
TYPE B "X" RING LOADED LIP U-CUP
Manufactured from a range of thermoplastic and thermoset compounds and using a rubber quad shaped expander to provide memory to the seal contact points. - Back beveled lip - Rectangular cross section/profile for increased stability.
TYPE B "O" RING LOADED U-CUP
Similar in function to the "X" ring loaded lip u-cup, except using an o-ring expander to provide memory to the seal contact points.
Unloaded Lip U-Cups
"US" SYMMETRICAL U-CUP
Symmetrical rod and piston seals proven effective in a wide variety of applications and manufactured from a wide variety of seal materials.
8500 HOMOGENEOUS RUBBER U-CUP
A square cross section seal, similar to the "8400" type (see Rod Seals) but without the back beveled lip and is often used as a piston seal.
Use gland dimensions pertaining to Unloaded or Loaded lip U-Cups. Please contact us for product details.Wear Guide & Non-Metallic Bearings
BC JOINT WEAR RING
A non-metallic bearing manufactured from a variety of high performance materials, with a butt cut for installation.
SC JOINT WEAR RING
A non-metallic bearing manufactured from a variety of high performance materials, with a scarf cut for installation and improved contamination resistance.
ST JOINT WEAR RING
A non-metallic bearing manufactured from a variety of high performance materials, with a step cut to reduce the potential gap.
CN WEAR RING
A non-metallic bearing manufactured in a continuous (no cut) ring from a variety of high performance materials.
Standard Wear Ring Materials
The physical properties of the most commonly used wear ring materials.
SD - (Standard Duty) Fiberglass loaded Nylon. For general hydraulic cylinder use.
FD - (Frictional Duty) Fiberglass and PTFE loaded Nylon. General hydraulic cylinder use with additional lubricant.
TB - (PTFE/Bronze) Highly lubricated for dry running surfaces and rotary use.
| Design Data (Minimums) | ||||
|---|---|---|---|---|
| Property | SD | FD | TB | |
| Tensile Strength (psi) | 24000 | 20000 | 2600 | |
| Compressive Strength (psi) | 23000 | 20000 | 1700 | |
| Flexural Strength (psi) | 35000 | 30000 | 3350 | |
| Coefficient of Thermal Expansion (10 exp -5) | 1.4 | 1.5 | 4.9 | |
| Water Absorption % | .9 to 1.2 | .9 to 1.2 | <0.25 | |
| Deformation Under Load | ||||
|
|
% @ 2,000 psi |
0.5 | 0.5 | ----- |
| % @ 1,200 psi | ----- | ----- | 2.2 | |
Wear Ring Gland Materials
Calculation steps for designing the glands for wear ring applications.
Piston Wear Ring Calculation Sheet.pdf
Rod Wear Ring Calculation Sheet.pdf
Standard Wall Thickness for Wear Rings
Radial wall manufacturing tolerances for the various standard wear rings.
| Standard Wear Ring Thickness(es) |
|---|
| W6 =.057/.060 |
| WT=.075/.080 |
| WH=.122/.125 |
| WR=.120/.125 |
| WB=.184/.187 |
Buffer Seals
BFR Buffer Seal
BFR BUFFER SEAL
A sealing device used as a "buffer" to reduce the impact of pressure spikes on the primary seal and consisting of an elastomeric energizer and a PTFE blend step shaped ring.
BUF Buffer Seals
BUF BUFFER SEAL
A sealing device used as a "buffer" to reduce the impact of pressure spikes on the primary seal and consisting of a lip type seal designed to relieve pressure and an integral rigid back-up ring.
SRS Buffer Seal
SRS BUFFER SEAL
A sealing device used as a "buffer" to reduce the impact of pressure spikes on the primary seal and consisting of rigid plastic and elastomeric components in a "self relieving" design
MSL Seals
Safety critical industries such as the medical, pharmaceutical, food, petroleum, aerospace, and power (both thermo-nuclear and traditional thermal) generation industries, face unique sealing challenges. In some of these applications any type of contamination or leakage will be disastrous to individuals and the environment. In addition, some industrial seals are required to operate effectively at extreme temperatures and in corrosive environments. When standard HPS offerings are inadequate to meet the stringent and unique requirements of such industries, Machined Spring Loaded (MSL) seals are custom designed and manufactured to do just that.
The profiles of MSL seals are unique to each customer and application since they are designed to meet specific challenges such as sealing in high or cryogenic temperatures and aggressive chemicals. Each MSL seal is made up of a precision machined thermoplastic or thermoplastic-elastomeric jacket and is energized by a metal or elastomeric energizer. Materials for both jacket and energizer are carefully selected based on the application. For example, an MSL seal for the food industry could be manufactured using a food grade PTFE jacket and a stainless-steel energizer. Some MSL profiles are depicted below for your preview and information. To match the optimized solution for your specific sealing requirements, please contact one of our professional sales engineers.
HPS-E-1
This seal, primarily designed for either ID dynamic or OD dynamic rotary manifold/swivel applications, has a uniquely profiled dynamic surface with improved sealing and lower friction than conventional manifold seals. Operating parameters are typically 3,000 psi at speeds of 10 RPM. This design has also been used successfully in linear applications and offers improved sealing over standard PTFE piston seals.
HPS-E-2
This triple lip MSL is well suited for sealing viscous and/or abrasive media in linear applications. For applications that are less than 180 oF, UHMWPE is typically used as the jacket material because of its superior resistance to abrasion. Various filled PTFE materials are available for higher temperatures, and/or when sealing fluids that may not be compatible with UHMWPE.
HPS-E-3
This MSL seal has a radiused lip profile which is preferred for dynamic sealing of lubricating media (the radiused seal lips are more tolerant of minor hardware eccentricity). This seal is predominately used in linear applications but can also be used in slow rotary or oscillating applications such as chemical processing Swivel joints.
HPS-E-4
A helical wound MSL utilizes a coil spring (that is wound from a flat ribbon of Stainless or Elgiloy). This spring creates a lip load that is approximately 3 times higher than a typical Cantilever Spring. The higher load improves the sealing characteristics of the seal but does shorten the wear life in dynamic applications. Typically, this design is used for low speed or static sealing from Cryogenic to 550 oF. They are typically used in Valves, Compressors and Expanders.
HPS-E-5
This design uses a double wound spring which doubles the spring load. It is a common design for improved sealing at cryogenic temperatures. The high spring load help to prevent the OD seal lip from thermally contracting away from the mating hardware. This design is used predominantly in Sealing Valves, Expanders and other equipment that requires seals capable of effective operation in extremely cold environments.
HPS-E-6
Wobble piston compressors do not have a wrist pin; the piston and connecting rod are a single entity resulting in the piston being on an angle while at mid stroke. These compressor pistons are typically sealed with a filled PTFE washer. The washer is clamped in place by the piston. The OD of the washer is larger than the bore, which causes the washer to form into a cup when installed into the bore.
HPS-E-7-R
These MSL seals have a skived sealing lip on the dynamic ID Sealing lip. This design is primarily used for dynamic sealing of non-lubricating abrasive media. Potential applications include sealing in: Hot melt glue Valves, Adhesives, Sealant pumps and valves, and drilling mud in Down hole tools.
HPS-E-7-P
Same as the HPS-E-7-R but designed as a piston seal for dynamic sealing against bores.
HPS-E-8
This is a spring energized face seal that can be produced for internal or external pressure. Seals are typically used as static joint seals or slow speed oscillatory seals in swivel joints.
HPS-E-9
This is an economical seal or wiper that is produced from UHMWPE or filled PTFE Compounds. This type of seal utilizes an elastomeric o-ring to energize the seal lip; the o-ring also acts as a static seal in the gland. Media compatibility and temperature range is typically limited by the elastomeric o-ring material.
HPS-E-10
This seal is specifically designed for sealing valve stems in valves used in oil and gas industries. The sealing jacket can be produced from various grades of PTFE; the spring is a heavier cantilever spring produced from Elgiloy.
Rotary Manifold (Swivel) Seals
FLAT BOTTOM CROWN SEAL
Proven very effective in sealing low-pressure ports in rotary manifold applications.
NARROW BASE FLAT BOTTOM CROWN SEAL
Designed to retrofit into square PTFE cap seal grooves and often used in rotary manifold applications requiring virtually "zero" leakage between ports.
HYDRA-GLYD CAP SEAL ASSEMBLY
Consists of a specially designed seal ring with a grooved dynamic surface to carry lubrication while increasing the unit load on the adjoining contact areas and used in conjunction with an elastomeric energizer (o-ring, square or quad shaped ring).
CAP SEAL WITH SIDE WALL NOTCHES
A radial compression cap seal with sidewall notches to provide instant pressurization in rapid pressure reversal conditions to prevent "fluid blow-by".
Rotary Oil Seals
Rod Wipers
D WIPER
A more robust snap-in exclusion device than the AN style and ideal for larger diameter rods.
DS WIPER
Similar to the D wiper but with a slotted heel to eliminate the possibility of a pressure trap between the rod seal and wiper.
H WIPER
A dual lip snap-in wiper usually manufactured in polyurethane that retrofits the 8600 series rubber wiper groove.
K WIPER
A dual lip snap-in wiper similar to the H style, designed to fit into it?s own unique groove.
BK WIPER
Retrofits into K wiper grooves but with a more aggressive scraping profile and a beaded OD to seal the static side against contaminants.
MC WIPER
An aggressive press-fit polyurethane excluder, designed to incorporate both a mechanical and chemical bond between wiper element and steel retainer.
MCS WIPER
Incorporates a steel spring into the MC wiper design to exclude contaminants during severe service conditions including side loading and temperature extremes.
SC WIPER
A press-fit wiper with a specially designed scraping lip that helps to keep mud or similar substances from solidifying within the wiper cavity and thus reducing its effectiveness.
O-Ring, 'X' ring & Back-Ups
O-RING
Simplest seal shape molded from the broadest possible spectrum of high quality compounds.
HYDRA-BAK CONTOURED O-RING BACK-UP
Manufactured from a 90 Shore A durometer rubber compound, that is contoured to accept use with o-rings and which is easily stretched for installation.
FLAT SOLID O-RING BACK-UPS
Manufactured from extrusion resistant thermoplastic materials and may be stretched for ease of installation.
FLAT-SPLIT O-RING BACK-UPS
Manufactured from non-resilient materials such as polyamide, PTFE or other rigid materials and split to allow for installation.
SPIRAL O-RING BACK-UPS
Usually manufactured from PTFE and provides protection around the full circumference of the o-ring while retaining ease of installation.
| O-Ring Material Codes and Temperature ranges | |||
|---|---|---|---|
| Polymer Key | Temperature Range | ||
| Code | Polymer | ºF | ºC |
| PZ | Polyacrylate | 0 to +350 | -18 to +177 |
| R | Neoprene | -65 to +302 | -54 to +150 |
| E | Ethylene Propylene | -65 to +302 | -54 to +150 |
| FZ | Fluorosilicone | -85 to +350 | -65 to +177 |
| N | Nitrile (Buna N) | -65 to +275 | -54 to +135 |
| U | Polyurethane | -65 to +212 | -54 to +100 |
| S | Silicone | -80 to +400 | -62 to +205 |
| V | Fluorocarbon | -20 to +450 | -29 to +232 |
| HN | HNBR | -13 to +320 | -25 to +160 |
| Back-up Material Codes and Temperature Ranges | |||
|---|---|---|---|
| Polymer Key | Temperature Range | ||
| Code | Polymer | ºF | ºC |
| DN | Nitrile (Buna N) | -30 to +250 | -34 to +121 |
| SC | Polyurethane | -65 to +212 | -54 to +100 |
| DH | Hytrel | -65 to +275 | -54 to +135 |
| AB | PTFE | -400 to +400 | -240 to +205 |