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Piston Seals

Parker piston seals for hydraulic and pneumatic cylinders and actuators are designed to separate applied pressure between the piston and the rod side during the stroke movement. They are available as single-acting and double acting seals in a wide range of compound and profile configurations to meet diverse applications: high and low temperatures and pressures, a wide variety of media, harsh operating conditions, various friction requirements, etc. Parker piston seals can cover working temperatures from -50°C to 230°C and working pressures up to 800 bar. Some seal profiles are insensitive to extreme pressure peaks. There are piston seals available that comply with ISO 6020, ISO 5597 and ISO 7425-1 standards.

OA_zm

Piston sealing set Prädifa series OA

Maximum Operating Temperature: 80 to 230 °C

Thermal Application Type: Expanded Low and High Temperature (< -35°C to 140°C), Low Temperature (< -35 C) °C, High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Pneumatic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Ultra-High Molecular Weight Polyethylene (UHMWPE)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -200 to -20 °C

Maximum Surface Speed: 4 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Pressure Rating: Pneumatic Pressure (< 16 bar)

The double-acting OA piston sealing set featuring a Slipper Seal® design consists of a PTFE piston sealing ring and an elastomer O-ring as a preloading element. The seal design is intended for pneumatic applications. The symmetrical cross section of the sealing ring is designed for uniform formation of the lubricant film during the stroke in both directions. The OA sealing set is particularly well suited for doubleacting pistons.

Due to the material combination of the slide ring (PTFE) and O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. For pneumatic applications, the piston sealing ring is preferably made from a carbon-filled PTFE compound in order to avoid chemical reactions with the aluminum components of the cylinder. Alternatively, several compounds can be selected, depending on the specific applications profile.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Good sealing performance in extremely small assembly conditions.
  • Can also be used for single-acting applications.
  • Good wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform otion even at low speeds.
  • Good energy efficiency due to low friction.
  • Very good emergency running properties in low-lube conditions.
  • Assembly on one-part piston is possible.
  • High temperature resistance assured by suitable O-ring compound selection.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and arge O-ring compound selection.
  • Short axial assembly length.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 3000 mm.
  • Machined small-volume series and samples available with short lead times.

Range of application:

Piston sealing set for pneumatic applications.

OE_zm

Piston sealing set Prädifa series OE

Maximum Operating Temperature: 80 to 230 °C

Media: Hydraulic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)

Maximum Operating Pressure: 400 bar

Minimum Operating Temperature: -200 to -20 °C

Maximum Surface Speed: 4 m/sec

Cushioning Mechanism: No

The double-acting OE piston sealing set featuring a Slipper Seal® design consists of a PTFE piston sealing ring and an elastomer O-ring as a preloading element. The seal design is intended for hydraulic applications. The symmetrical cross section of the sealing ring is designed for uniform return of drag oil during the stroke in both directions. The OE sealing set is particularly well suited for double-acting pistons in control cylinders, servo-controlled systems, machine tools and quick-acting cylinders.

Due to the material combination of the slide ring (PTFE) and O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. For hydraulic applications, the piston sealing ring is preferably made from a bronze-filled PTFE compound in order to avoid reliable extrusion resistance. Alternatively, several compounds can be selected, depending on the specific applications profile.

  • Good sealing performance in extremely small assembly conditions.
  • Can also be used for single-acting applications.
  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • Assembly on one-part piston is possible.
  • Insensitive to pressure peaks.
  • High temperature resistance assured by suitable O-Ring compound selection.
  • High extrusion resistance.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-Ring compound selection.
  • Dimensions according to ¬ISO ¬7425-1.
  • Short axial assembly length.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 3000 mm.
  • Further dimensions of machined series with short lead times available.

Range of application:

For high-pressure applications

CP_zm

Piston sealing set Prädifa series CP

Maximum Operating Temperature: 80 to 200 °C

Media: Hydraulic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Ultra-High Molecular Weight Polyethylene (UHMWPE)

Maximum Operating Pressure: 160 bar

Minimum Operating Temperature: -40 to -25 °C

Maximum Surface Speed: 4 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35°C to 100°C), High Temperature (< 205 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C

Pressure Rating: Low Temperature (< -35 C

The double-acting CP sealing set featuring a Caveseal design consists of a PTFE slide ring and an elastomer O-ring as a preloading element. The sealing set is suitable for dynamic applications as an alternative to an Oring in situations requiring optimum sealing performance and friction. The Caveseal design enables smallest grooves. bDue to the material combination of the slide ring (PTFE) and the O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. An extensive selection of compounds is available for specific application profiles.

  • Good sealing performance in extremely small assembly conditions.
  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • Assembly on one-part piston is possible.
  • High temperature resistance assured by suitable O-ring compound selection.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-ring compound selection.
  • Short axial assembly length.
  • Short radial assembly depth.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 3000 mm.
  • Can be used in existing O-ring grooves.
  • Additional sizes of machined products available on short notice.

Range of application:

The CP profile range has been designed exclusively to replace standard O-rings. For dynamic applications we recommend our OA (pneumatics) or OE (hydraulics) profile ranges.

KR_zm

Piston sealing set Prädifa series KR

Maximum Operating Temperature: 80 to 110 °C

Thermal Application Type: Low Temperature (< -35°C), Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 300 bar

Minimum Operating Temperature: -50 to -35 °C

Maximum Surface Speed: 0.5 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Pressure Rating: Medium Pressure (< 250 bar)

The Ultrathan® piston sealing set KR complements the product range of double-acting piston seals (OE, OK) for grooves according to ISO 7425-1 by a product which is preferably used in the medium-duty pressure range up to a maximum of 300 bar. The sealing set stands out by its extreme wear resistance and exceptionally high static and dynamic sealing performance and can also be used for piston accumulators.

The KR sealing set consists of a polyurethane slide ring with improved sliding properties and particularly high modulus and an energizer with rectangular cross-section made of an NBR elastomer.

  • Exceptionally high static and dynamic sealing performance.
  • Good sealing performance in extremely small assembly conditions.
  • Can also be used for single-acting applications.
  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • Long service life thanks to application-optimized compounds.
  • Constantly low dynamic friction throughout the part’s service life.
  • Easy snap assembly on a single-part piston.
  • Insensitive to pressure peaks.
  • Functional reliability at critical temperatures.
  • High extrusion resistance.
  • Dimensions according to ISO 7425-1.
  • Short axial assembly length.
  • Installation in closed and undercut housings.

Range of application:

The KR piston sealing set is suitable for use in all standard industrial cylinders, farming equipment, light construction machinery and mobile devices. Due to its exceptionally high dynamic sealing performance, it is particularly well suited for leakage-critical applications.

OT_zm

Piston sealing set Prädifa series OT

Maximum Operating Temperature: 110 to 200 °C

Thermal Application Type: High Temperature (< 205°C), Low Temperature (< -35 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)

Maximum Operating Pressure: 400 bar

Minimum Operating Temperature: -50 to -25 °C

Maximum Surface Speed: 4 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Pressure Rating: High Pressure (< 500 bar)

The double-acting piston sealing set profile OT featuring a Slipper Seal® design stands out by its minimal break-away and dynamic friction and is therefore also suitable for low-lube conditions. The seal design enables fast reaction in reciprocating pressure loads.

The material combination of the slipper ring (PTFE) and the O-ring (elastomer) makes this product suitable for a wide Range of application:s, especially for aggressive media and/or high temperatures. Multiple compounds can alternatively be selected according to the individual application profile.

  • Good sealing performance in extremely small assembly conditions.
  • Can also be used for single-acting applications.
  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • Assembly on one-part piston is possible.
  • Insensitive to pressure peaks.
  • High temperature resistance assured by suitable O-ring compound selection.
  • High extrusion resistance.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-ring compound selection.
  • Dimensions according to ISO 7425-1.
  • Short axial assembly length.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 3000 mm.
  • Additional sizes of machined products available on short notice.

Range of application:

Wide Range of application:s, especially for aggressive media and/or high temperatures.

The OT piston sealing set is particularly suitable for double-acting pistons in control cylinders, servocontrolled systems and machine tools.

PZ_zm

Piston seal Prädifa series PZ

Maximum Operating Temperature: 80 to 200 °C

Thermal Application Type: Expanded Low and High Temperature (< -35°C to 140°C), High Temperature (< 205 C) °C, Low Temperature (< -35 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Pneumatic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN), Ethylene Propylene Rubber (EPM, EPR, EPDM)

Maximum Operating Pressure: 12 bar

Minimum Operating Temperature: -50 to -5 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Pressure Rating: Pneumatic Pressure (< 16 bar)

The PZ pneumatic piston seal has been developed for use in pneumatic cylinders and in valves. The doubleacting piston seal requires only very small housing dimensions and is therefore especially suitable for compact cylinders.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Good sealing performance in extremely small assembly conditions.
  • Can also be used for single-acting applications.
  • Good wear resistance.
  • Low static and dynamic friction thanks to miniaturized design.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Suitable for fully automatic installation
  • Assembly on one-part piston is possible.
  • High temperature resistance in case of suitable compound selection.
  • Excellent media resistance in case of suitable compound selection.
  • Short axial assembly length.
  • Installation in closed housings.

Range of application:

Pneumatic cylinders and valves.

Z5_zm

Piston seal Prädifa series Z5

Maximum Operating Temperature: 80 to 200 °C

Thermal Application Type: High Temperature (< 205°C), Low Temperature (< -35 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Pneumatic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -50 to -20 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Pressure Rating: Pneumatic Pressure (< 16 bar)

The Z5 pneumatic piston seal is a double U-ring with an integral guiding surface for double-acting pistons. The seal has two sealing lips for particularly high sealing performance.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Multi-functional sealing element. The guiding area at the sealing element performs the guiding function in the cylinder. However, due to its geometry the sealing element is not suitable for absorption of high radial forces or long strokes.
  • Prevents metallic contact between the piston and cylinder. Ideal for light-metal and plastic cylinders (ridging).
  • Good wear resistance.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Easier installation.
  • Assembly on one-part piston is possible.
  • High temperature resistance in case of suitable compound selection.
  • Excellent media resistance in case of suitable compound selection.
  • Installation in open housings with retaining collar.

Range of application:

Pneumatic cylinders

ZC_zm

Piston sealing set Prädifa series ZC

Maximum Operating Temperature: 100 °C

Media: Hydraulic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR)

Maximum Operating Pressure: 500 bar

Minimum Operating Temperature: -20 °C

Maximum Surface Speed: 0.5 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35°C to 100°C)

Pressure Rating: Extremely High Pressure (> 500 bar)

The double-acting piston sealing set ZC consists of a rubber-fabric seal with back-up rings on both sides to prevent extrusion. The dynamic surface of the seal on the outer diameter is reinforced with a special dimensionally stable fabric. This supports the development of a lubricating film between the seal and the cylinder wall, even after long standstill periods and under high pressure. This grease deposit reduces breakaway friction and dynamic friction and thus wear of the dynamic surface of the seal. The surface structure ensures wear resistance, even in low-lube conditions. The ZC sealing set is extremely robust, even in harshest conditions such as particle contamination in the system.

  • Exceptionally high static and dynamic sealing performance.
  • Enhanced sealing performance in non-pressurized conditions.
  • Can also be used for single-acting applications.
  • Robust seal profile for harshest operating conditions.
  • Insensitive to contamination of the operating medium or slight damage of the sliding surfaces compared with single-part seals.
  • Good wear resistance.
  • Long service life thanks to application-optimized compounds.
  • Constantly low dynamic friction throughout the part’s service life.
  • Insensitive to extreme pressure peaks.
  • Improved lubrication due to pressure medium deposit in the dynamic contact area.
  • Extremely high extrusion resistance.
  • Simple fabrication of the housing.
  • Installation in open housings.

Range of application:

Mainly used for double-acting pistons in cylinders for hydraulic roof supports and for tunneling machines

ZP_zm

Piston sealing set Prädifa series ZP

Maximum Operating Temperature: 100 °C

Inside Diameter: 95 to 275 mm

Outside Diameter: 110 to 300 mm

Media: Hydraulic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR)

Maximum Operating Pressure: 500 bar

Minimum Operating Temperature: -20 °C

Maximum Surface Speed: 0.1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35°C to 100°C)

Pressure Rating: Extremely High Pressure (> 500 bar)

The double-acting piston sealing set ZP consists of a rubber-fabric seal with back-up rings on both sides to prevent extrusion. The dynamic surface of the seal on the outer diameter is reinforced with a special dimensionally stable fabric. This supports the development of a lubricating film between the seal and the cylinder wall, even after long standstill periods and under high pressure. This grease deposit reduces breakaway friction and dynamic friction and thus wear of the dynamic surface of the seal. The surface structure ensures wear resistance, even in low-lube conditions. The ZP sealing set is extremely robust, even in harshest conditions such as particle contamination in the system.

  • Exceptionally high static and dynamic sealing performance.
  • Enhanced sealing performance in non-pressurized conditions.
  • Can also be used for single-acting applications.
  • Robust seal profile for harshest operating conditions.
  • Insensitive to contamination of the operating medium or slight damage of the sliding surfaces compared with single-part seals.
  • Good wear resistance.
  • Long service life thanks to application-optimized compounds.
  • Constantly low dynamic friction throughout the part’s service life.
  • Insensitive to extreme pressure peaks.
  • Improved lubrication due to pressure medium deposit in the dynamic contact area.
  • Extremely high extrusion resistance.
  • Simple fabrication of the housing.
  • Installation in open housings.

Range of application:

Mainly used for double-acting pistons in cylinders for hydraulic roof supports and for tunneling machines.

ZW_zm

Piston sealing set Prädifa series ZW

Media: Hydraulic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR)

Maximum Operating Pressure: 400 bar

Minimum Operating Temperature: -45 to -35 °C

Maximum Operating Temperature: 80 °C

Maximum Surface Speed: 0.5 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35°C to 100°C)

Pressure Rating: High Pressure (< 500 bar)

The ZW double-acting piston sealing set consists of an elastomer sealing component, two anti-extrusion and two angular guide rings. By combining the sealing and guiding functions, it offers a cost-effective all-inone solution for medium-duty standard cylinders.

  • Good wear resistance.
  • Assembly on one-part piston is possible.
  • Installation in closed and undercut housings.

Range of application:

Sealing set for double-acting pistons in presses, control cylinders, back-up and actuating cylinders for industrial and mobile hydraulics.

spp_zm

Standard PolyPak Hydraulic Seal With Knife Trimmed Scraper Lips

Groove Width: 0.125 to 1.000 inch

Maximum Operating Pressure: 2000 to 7000 psi

Minimum Operating Temperature: -65 °F

Maximum Operating Temperature: 400 °F

Body Material: EPDM, FKM, TPU, TPC-ET, XNBR, HNBR

Spring Material: EPDM, FKM, NBR, HNBR

For Fluid Type: Water / Steam, Broad range, Oils

Durometer: 70 to 95 Shore A, 53 to 60 Shore D

Colour: Black, Yellow, Orange

Thermal Application Type: Varies depending on material

Polymer Material Options: Ethylene Propylene Rubber (EPM, EPR, EPDM), Fluorocarbon Rubber (FKM, FPM), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Thermoplastic Copolyester Elastomer (TPC, TPE), Nitrile Butadiene Rubber (NBR, XNBR), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN)

Specifications Met: none

Media: Hydraulic

Unit of Measure: Length: inch

Maximum Surface Speed: 1.6 ft/sec | 0.5 m/sec

A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab. To check current tooling, review the Part Number Look-up document. Contact Parker for requirements outside typical ranges. Parker’s SPP Profile Standard PolyPak® seal is a square cross-section squeeze seal with a symmetrical profile for use in either rod or piston applications in hydraulic systems. The standard Molythane shell (seal body) provides high wear resistance and the O-ring spring energizer element functions as a spring to maintain sealing contact under low pressure. The SPP Profile Standard PolyPak seal utilizes a scraper lip design formed by a precision trimming process. The scraper edge wipes both fluid film and contamination away from the seal. A wide selection of sizes and alternate compounds allow this profile to match up with many hydraulic applications.

Standard Materials (Shell or Seal Body):

  • P4615A90 Molythane®; Temp -65 / +200F; Pressure* 5000 psi; Surface speed <1.6 ft/s
  • P4622A90 Ultrathane®; Temp -65 / +225F; Pressure* 5000 psi; Surface speed <1.6 ft/s
  • Z4651D60 PolyMyte®; Temp -65 / +275F; Pressure* 7000 psi; Surface speed <1.6 ft/s
  • N4263A90 Nitroxile®; Temp -20 / +275F; Pressure* 2000 psi; Surface speed <1.6 ft/s
  • E4207A90 Ethylene Propylene; Temp -65 / +300F; Pressure* 2000 psi; Surface speed <1.6 ft/s
  • V4266A95 FKM; Temp -5 / +400F; Pressure* 2250 psi; Surface speed <1.6 ft/s
  • V4208A90 FKM; Temp -5 / +400F; Pressure* 2000 psi; Surface speed <1.6 ft/s
  • N4007A95 HNBR; Temp -20 / +320F; Pressure* 2500 psi; Surface speed <1.6 ft/s

Please note: Pressure ratings shown are for predominantly dynamic applications. Where the application is predominantly static, as is typical in Oil & Gas applications, maximum pressure ratings may be extended by a factor of 2 to 3 (or greater), assuming nominal extrusion gap and operating temperature within limits. For assistance, please contact Parker’s application engineering team.

*Pressure ranges shown are for systems without wear rings. If using wear rings, please consult Engineering

Section (Section 2) of Parker’s Fluid Power Seal Design Guide, Catalog EPS5370.

Energizer Spring Element Materials:

  • For seals with 4615 or 4622 PolyPak shell, the standard spring energizer is a nitrile o-ring
  • For seals with 4651 PolyPak seal body, the O-spring energizer code must be specified. The standard code is “N” for nitrile o-ring
  • For seals with rubber PolyPak seal body, standard spring energizer is an o-ring from the same rubber material family as the seal body.
ct_zm

CT Profile, 4-Piece PTFE Cap Seal

Seal Material: PTFE

PERFORMANCE ADVANTAGES

Parker’s CT Profile is a robust design for heavy duty hydraulic applications. IT is an excellent choice for sealing mobile hydraulic cylinders in applications that experience shock loads.

The CT Profile is a four-piece assembly made up of a rubber energizer, PTFE cap and two back-up rings. In application, fluid pressure forces the rubber energizer to apply increased load against the PTFE cap and back-up rings. This results in increased sealing force against the bore and allows the back-up rings to close off the extrusion gap between the piston and the bore. Once activated by pressure, the back-up rings protect the seal from extruding and keep internal contamination away from the PTFE cap.

Parker’s CT Profile piston seal will retro-fit non-Parker seals of similar design.

The CT Profile is sold only as an assembly (seal, energizer and back-up rings). The temperature range of the CT profile is limited to the thermal capability of the rubber energizer. A wider temperature range may be achieved by using alternate energizer and back-up ring materials.

Standard Materials

  • PTFE, Cap: 0401, 40% bronze-filled PTFE; Temp limited by capability of energizer; Pressure dictated by back-up rings; Surface Speed <5 ft/s)
  • Rubber Energizer: 70A Nitrile; Temp -30 / +250F
  • Back-up rings: Moly-filled nylon; Temp limited by capability of energizer; Pressure Range 7,500 psi*

*Pressure range shown is for systems without wear rings. If used with wear rings, consult Engineering

Section (Section2) of Parker’s Fluid Power Seal Design Guide, Catalog EPS5370.

custom_ptfe_chevronstacks_zm

PTFE Chevron Stacks Prädifa

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Polyether Ether Ketone (PEEK)

Maximum Operating Temperature: 315 °C

Minimum Operating Temperature: -260 °C

Operating Pressure: 30000 psi, 2068 bar

Maximum Surface Speed: < 5 m/sec

For Fluid Type: Ultra Broad Range

Application: Slow rotating or reciprocating applications like stem or seat seals in valves, pumps and compressors

Product Type: Rod Seals, Piston Seals, Custom Shapes

Specifications Met: NORSOK M-710, API 6A, NACE

Industry: Oil & Gas, General Industrial

Division: Prädifa Technology Division

Technology: Sealing & Shielding

For applications with special seal performance and reliability requirements, Parker has developed a PTFE chevron packing set. It is manufactured from PTFE-based compounds and other high-performance polymers using proven FlexiSeal® technology.

A typical PTFE chevron packing set consists of a radial FlexiSeal® followed by several V-rings and a pressure ring. The FlexiSeal® is the primary sealing element. When pressurized, it activates the subsequent V-shaped chevron seals, pushing the sealing lips outward. The numerous sealing edges generated this way reduce the risk of leakage.

The pressure ring ensures that the softer PTFE elements are not pushed into the downstream system gap (gap extrusion).

The chevron packing sets are made of wear-resistant PTFE compounds. The pressure ring typically consists of PEEK.

For the sealing requirements of the oil and gas market, Parker offers a range of materials with NORSOK and NACE approvals. A list of these materials is available on request.

Advantages over conventional elastomer-based chevron packing sets:

  • Chemical and thermal advantages of PTFE over elastomer compounds.
  • No special tooling required.
  • Fast design and short manufacturing times.
  • Simpler system design and installation as no mechanical activation elements are necessary.

Range of Application:

  • Valve stems
  • Machines with very fast reciprocating movements
  • Forging presses
  • Injection molding machines
  • Hydraulics in steel mills
  • Marine hydraulics
  • Petroleum production
CT_zm (1)

Double acting composite PTFE piston seal: CT

Operating Temperature: -40 to +110 °C

Operating Pressure: 500 bar

Operating Speed: 1.5 m/sec

CT profile is a fource piece assembly made up of a rubber energizer,PTFE cap and two back-up rings.It is a robust design for heavy duty hydraulic applications.

OU_zm

Double acting PUR composite piston seal: OU

Operating Temperature: -35 to +100 °C

Operating Pressure: 300 bar

Operating Speed: 0.5 m/sec

OU profile is a 2 piece assembly made up of an O-ring energizer and a TPU sealing ring. It is double acting piston seal for use in light and medium duty hydraulic applications. It fits ISO7425/1 housing.