The choice of piston seal is decided by the way in which the cylinder operates. For a cylinder which is exclusively single-acting, capable of sealing dynamic pressure from one side (unidirectional), it is always best to choose the type of seal designed to provide optimum sealing qualities for single-acting functions.

Piston seals designed for bidirectional pressure

The best sealing capacity of a double-acting cylinder, capable of sealing dynamic pressure from both sides (bidirectional), is achieved by choosing a double-acting seal.

A piston design where two single-acting seals on the piston for a double-acting cylinder are used can easily give rise to a breakdown. The reason is that a very high pressure can be trapped between the seals.
Piston seals, both single- and double-acting, can be designed for and used with integrated or separate back-up rings and guide rings.

Hallite offers a wide range of piston seals that provide the ultimate in leakage control. Piston seals are usually manufactured in our high performance polyurethane Hythane® 181, Hallprene® rubber/fabric composite or polyester elastomer.

454 Max pressure 350 Bar Temp range -30°C 100°C Max speed 4m/sec The Hallite 454 double acting piston seal design, with a filled PTFE face ring, provides the designer with a compact, low friction seal for light to medium duty hydraulic cylinders.	454
Max pressure	350 Bar
Temp range	-30°C to 100°C
Max speed	4m/sec

455 Max pressure 350 Bar Temp range -30°C 100°C Max speed 4m/sec The Hallite 455 double acting piston seal design, with a filled PTFE face ring, provides the designer with a compact, low friction seal for light to medium duty hydraulic cylinders.	455
Max pressure	350 Bar
Temp range	-30°C to 100°C
Max speed	4m/sec

50 Max pressure 350 Bar Temp range -30°C 100°C Max speed 0.5m/sec The Hallite 50 comprises of a rubber seal, two split support rings and two split bearings, located either side of the seal. The nitrile rubber seal has proved itself to be extremely wear resistant in service.	50
Max pressure	350 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

51 Max pressure 700 Bar Temp range -30°C 100°C Max speed 0.5m/sec The Hallite 51 is a heavy duty piston seal which, when installed in pairs, provides an excellent double acting piston design. It is particularly suitable for difficult operating conditions such as pressure surging, vibration or some misalignment.	51
Max pressure	700 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

52 Max pressure 600 Bar Temp range -30°C 100°C Max speed 0.8m/sec The Hallite 52 is a two piece piston seal for heavy duty applications which, when installed in pairs, provides an excellent double-acting piston design. It is suitable for difficult operating conditions such as pressure surging, vibration or some misalignment.	52
Max pressure	600 Bar
Temp range	-30°C to 100°C
Max speed	0.8m/sec

53 Max pressure 500 Bar Temp range -30°C 100°C Max speed 0.5m/sec A robust assembly designed specifically for one piece pistons, the Hallite 53 double acting seal uses a rubber sealing element which has proved itself in service to be extremely wear resistant and capable of working most effectively in a wide variety of medium duty applications.	53
Max pressure	500 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

54 Max pressure 350 Bar Temp range -30°C 100°C Max speed 4m/sec The Hallite 54 double acting piston seal design, with a filled PTFE face ring, provides the designer with a compact, low friction seal for light to medium duty hydraulic cylinders.	54
Max pressure	350 Bar
Temp range	-30°C to 100°C
Max speed	4m/sec

56 Max pressure 500 Bar Temp range -30°C 100°C Max speed 0.5m/sec A medium to heavy duty double acting seal, the Hallite 56 has shown itself over many years to be an effective and robust piston seal in a wide variety of applications.	56
Max pressure	500 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

58 Max pressure 700 Bar Temp range -30°C 100°C Max speed 0.5m/sec The combined nature of this seal enables the designer to use large clearances and, with the integral bearing rings, to restrict the piston length.	58
Max pressure	700 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

64 Max pressure 400 Bar Temp range -30°C 100°C Max speed 0.5m/sec A robust seal assembly designed specifically for one piece pistons, the Hallite 64 double acting seal uses a rubber sealing element which has proved itself in service to be extremely wear resistant and capable of working most effectively in a wide variety of medium to heavy duty applications.	64
Max pressure	400 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

65 Max pressure 160 Bar Temp range -30°C 100°C Max speed 0.5m/sec Ideal for light duty one piece piston applications, the Hallite 65 double acting seal is a simple, effective and economical design for pressures up to 160 bar/2500 p.s.i. its compact dimensions enable the designer to keep the length of the piston to a minimum. It is an assembly of a continuous rubber seal and two scarf cut bearings.	65
Max pressure	160 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

68 Max pressure 500 Bar Temp range -30°C 100°C Max speed 0.5m/sec A robust seal assembly designed specifically for one piece pistons, the Hallite 68 double acting seal uses a rubber sealing element which has proved itself in service to be extremely wear resistant and capable of working most effectively in a wide variety of medium to heavy duty applications.	68
Max pressure	500 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

714 Max pressure 500 Bar Temp range -40°C 110°C Max speed 1m/sec The Hallite 714 double-acting piston seal is a compact seal for medium to heavy-duty applications.	714
Max pressure	500 Bar
Temp range	-40°C to 110°C
Max speed	1m/sec

730 Max pressure 700 Bar Temp range -30°C 100°C Max speed 0.3m/sec The Hallite 730 double-acting piston seal in a four part assembly is designed for use in heavy-duty applications where position holding ability is important, such as longwall mining roof support applications using water-based fluids and large diameter crane cylinders using standard hydraulic oils.	730
Max pressure	700 Bar
Temp range	-30°C to 100°C
Max speed	0.3m/sec

735 Max pressure 500 Bar Temp range -40°C 120°C Max speed 1.5m/sec Hallite 735 is a compact double-acting piston seal assembly designed for one piece pistons and is suitable for low to high pressure, medium to heavy duty applications.	735
Max pressure	500 Bar
Temp range	-40°C to 120°C
Max speed	1.5m/sec

754 Max pressure 350 Bar Temp range -40°C 110°C Max speed 1m/sec The Hallite 754 is comprised of a tough, wear-resistant thermoplastic elastomer face seal which is pre-loaded by a NBR O-ring. The face material comes in a number of material options to extend operating conditions. The housing width allows a narrow width piston to be used.	754
Max pressure	350 Bar
Temp range	-40°C to 110°C
Max speed	1m/sec

755 Max pressure 350 Bar Temp range -40°C 110°C Max speed 1m/sec The Hallite 755 double-acting piston seal is a compact, low friction seal for light to medium duty applications designed originally to fit North American NFPA groove standards.	755
Max pressure	350 Bar
Temp range	-40°C to 110°C
Max speed	1m/sec

764 Max pressure 250 Bar Temp range -30°C 110°C Max speed 1m/sec The Hallite 764 double-acting piston seal is a compact, low friction seal for light to medium duty applications.	764
Max pressure	250 Bar
Temp range	-30°C to 110°C
Max speed	1m/sec

77 Max pressure 350 Bar Temp range -30°C 100°C Max speed 0.5m/sec Ideal for light duty one piece piston applications, the Hallite 77 seal is a simple, effective and economical design.	77
Max pressure	350 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

775 Max pressure 350 Bar Temp range -30°C 110°C Max speed 1m/sec Characteristics and performance The Hallite 775 double-acting piston seal is a compact seal for light to medium-duty applications and designed to fit two housing standards; one for standard O-ring grooves, the second for grooves designed for an O-ring and two back-up rings. The advanced face geometry gives the Hallite 775 single-acting capabilities making it an…	775
Max pressure	350 Bar
Temp range	-30°C to 110°C
Max speed	1m/sec

777 Temp range -40°C 120°C Max speed 0.5m/sec The Hallite 777 double-acting, energised piston seal is a compact seal for medium to heavy-duty applications designed to fit a range of industry standard grooves making it ideal for retrofitting existing products.	777
Temp range	-40°C to 120°C
Max speed	0.5m/sec

780 Max pressure 400 Bar Temp range -30°C 100°C Max speed 0.5m/sec The Hallite 780 double-acting piston seal in a robust five part assembly is designed specifically for one piece pistons in a wide range of medium duty applications. The seal is also suitable for two piece pistons.	780
Max pressure	400 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

83 Max pressure 400 Bar Temp range -30°C 100°C Max speed 0.5m/sec The Hallite 83 Tri-Seal assembly offers the engineer many advantages when considering the design of cast iron, bronze, alloy etc.	83
Max pressure	400 Bar
Temp range	-30°C to 100°C
Max speed	0.5m/sec

CT Max pressure 600 Bar Temp range -45°C 200°C Max speed 1.5m/sec The Hallite Capped T maximizes performance by employing thicker anti-extrusion rings that protect the seal face and energizer from damaging high-pressure shocks well beyond what standard industry designs are capable of.	CT
Max pressure	600 Bar
Temp range	-45°C to 200°C
Max speed	1.5m/sec

G54 Max pressure 400 Bar Temp range -45°C 200°C Max speed 4m/sec The Hallite G54 is a double-acting, o-ring energized, low-friction piston seal that performs well in both high and low-pressure systems.	G54
Max pressure	400 Bar
Temp range	-45°C to 200°C
Max speed	4m/sec

Piston seals – double acting hydraulic seals

Piston seals or piston rings are used in hydraulic cylinders for fluid sealing and are designed to ensure that pressurised fluid does not leak across the cylinder head as the system pressure pushes the piston down the cylinder bore.

Piston seals designed for bidirectional pressure

Our comprehensive range of double acting piston seals

454

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455

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50

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51

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56

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58

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64

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65

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68

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714

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730

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735

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754

GP2 Max pressure 600 Bar Temp range -45°C 200°C Max speed 3m/sec The Hallite GP2 is a double-acting piston seal utilizing Hallite’s proprietary high- performance Armorlene® HLX PTFE paired with twin premium o-ring energizers and an x-ring for optimum performance and durability.	GP2
Max pressure	600 Bar
Temp range	-45°C to 200°C
Max speed	3m/sec

GPS Max pressure 500 Bar Temp range -45°C 200°C Max speed 2m/sec The Hallite GPS is a double-acting piston seal utilizing Hallite’s high-performance Armorlene® HLX PTFE paired with an elastomer energizer and x-ring for optimum performance and durability.	GPS
Max pressure	500 Bar
Temp range	-45°C to 200°C
Max speed	2m/sec

P54 Max pressure 600 Bar Temp range -45°C 200°C Max speed 4m/sec High-performance Armorlene® materials, like HLX, provide outstanding wear and extrusion-resistance properties as well as large range of temperature and media compatibility.	P54
Max pressure	600 Bar
Temp range	-45°C to 200°C
Max speed	4m/sec

PCA Max pressure 400 Bar Temp range -45°C 200°C Max speed 15m/sec The Hallite PCA is a double-acting piston seal that performs well in both high- and low-pressure systems.	PCA
Max pressure	400 Bar
Temp range	-45°C to 200°C
Max speed	15m/sec

PCG Max pressure 200 Bar Temp range -45°C 200°C Max speed 15m/sec The Hallite PCG is a double-acting, o-ring energized, low-friction piston seal designed for low- and medium-pressure systems.	PCG
Max pressure	200 Bar
Temp range	-45°C to 200°C
Max speed	15m/sec

PDS Max pressure 350 Bar Temp range -45°C 200°C Max speed 15m/sec The Hallite PDS is a double-acting low-friction piston seal solution for compact o-ring grooves, that extends the service range above what an o-ring alone is capable of supporting.	PDS
Max pressure	350 Bar
Temp range	-45°C to 200°C
Max speed	15m/sec

PFR Max pressure 350 Bar Temp range -45°C 200°C Max speed 4m/sec The Hallite PFR is a chamfered, double-acting piston seal that performs well in both high- and low-pressure systems.	PFR
Max pressure	350 Bar
Temp range	-45°C to 200°C
Max speed	4m/sec