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People also ask What is a hydraulic seal? What are types of hydraulic seals?

People also ask What is a hydraulic seal? What are types of hydraulic seals?

Short Description:

People also ask  What is a hydraulic seal?

The hydraulic oil seal is used to prevent hydraulic oil from leaking from the cylinder and protect the system from dust and dirt. Hydraulic oil seals withstand high pressure, high temperature, and lateral forces in the oil cylinder. Therefore, they need to have certain basic performance to ensure their functionality and durability. In this article, we will introduce some basic performance of hydraulic oil seal components.


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Characteristics of hydraulic oil seals  

https://www.bodiseals.com/hydraulic-seals/

  • Mechanical and physical properties

Hydraulic oil seal components should have certain mechanical and physical properties, such as tensile strength, elongation at break, hardness, and compression deformation. These characteristics affect the ability of seals to resist deformation, rupture, and wear under stress. Generally, hydraulic oil seal components should have high tensile strength, moderate elongation at break, appropriate hardness, and low compression deformation.

  • Elasticity and toughness

Hydraulic oil seal components should have sufficient elasticity and resilience to adapt to changes in the shape and size of the sealing surface. Elasticity is the ability of a sealing element to restore its original state after being deformed by external forces. Elasticity is the ability of sealing components to absorb and release energy during deformation. Usually, hydraulic oil seal components should have high elasticity and resilience to maintain good sealing performance.

  •  Heat resistance and low-temperature flexibility

Hydraulic oil seal components should have good heat resistance and low-temperature elasticity to withstand the temperature range of the operating environment. Heat resistance is the ability of seals to resist thermal degradation and softening at high temperatures. Low temperature flexibility is the ability of seals to resist hardening and cracking at low temperatures. Usually, hydraulic oil seal components should have high heat resistance and low-temperature flexibility to prevent failure or leakage due to temperature changes.

  • Chemical compatibility

Hydraulic oil seals should have good chemical compatibility with hydraulic oil and other substances in the working environment. Chemical compatibility is the ability of seals to resist chemical attack and swelling by hydraulic oil and other substances. Generally, hydraulic oil seals should have good chemical compatibility with mineral oil, synthetic oil, water-based fluids, ozone, and ultraviolet radiation.

  • Wear resistance and friction coefficient

Hydraulic oil seals should have good wear resistance and friction coefficient to reduce friction and wear between the seals and hardware. Wear resistance is the ability of a seal to resist the wear and erosion of hydraulic oil and solid particles in the working environment. The friction coefficient is the ratio of the frictional force between two contact surfaces to the normal force. Usually, hydraulic oil seal components should have high wear resistance and low friction coefficient to extend their service life and improve their efficiency.

What are types of hydraulic seals?

is a relatively soft, non-metallic ring, captured in a groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. Hydraulic seals are vital in machinery. Their use is critical in providing a way for fluid power to be converted to linear motion. Materials: polyurethane, rubber or PTFE.    The type of material is determined by the specific operating conditions or limits due to fluid type, pressure, fluid chemical compatibility or temperature.  Other materials  like :   NBR   EPDM   FKM  FPM  VITON   HNBR   SILICONE VMQ  FFKM CR  SBR   FVMQ   AFLAS FEPM  ACM

 

1.Wiper Seal

Wiper seals maintain sealing contact to the piston rod when the equipment is stationary (static, no reciprocating motion of rod) and in use (dynamic, reciprocating rod), whereas the tolerance for the rod diameter d is determined by the rod seal. Without a wiper seal, the retracting piston rod could transport contaminants into the cylinder.The outside static sealing of the wiper seal within the housing is also important to avoid moisture or particles from entering around the outside of the wiper seal.

WIPER  SEAL  SECTION wiper  seal  charts

 

2.Rod  Seal

BD SEALS  rod seals for hydraulic and pneumatic cylinders and actuators seal the applied system pressure against the atmosphere side. Their purpose is to prevent external leakage and thus avoid contamination of the ambient environment. They are available as single-acting and double acting seals. High-pressure applications usually require a tandem rod sealing system including a buffer seal. Rod seals typically interact with wiper elements in the cylinder sealing system. A wide range of compound and profile configurations is available to meet the specific application profile. There are rod seals available that comply with ISO9001, FDA   standards.Rod Seals are the most important seal within any hydraulic sealing system.  Rod Seals prevent leakage of hydraulic fluid to the outside of the sealing system. Additionally, Rod Seals help contribute, in combination with a Wiper Seal, to preventing contamination of the environment.  GFS Rod Seal profiles are available as single acting (pressure from one side) or double acting (pressure from both sides). Check out the EIGHT  different types of profiles below to see which is most applicable to your application.

https://www.bodiseals.com/hydraulic-seals/

Size Size Size
4×10×4 10×16×4 13×19×5
4×12×4 10×16×4.5 13×20×5.5
4×12×6 10×16×5 14×20×4.4
5×11×8 10×16×5.5 14×20×5
5×12×5 10×16×6 14×20×6
5×12×6 10×18×5 14×20×8
5×12×7 10×18×5.5 14×22×4
5×12×8 10×18×6 14×22×4.5
5×14×6 10×18×8 14×22×5
5×14×8 10×19×7 14×22×6
5×15×6 10×20×6 14×22×7
5.8×12×5.2 10×20×8 14×22×8
6×12×4 10×22×6 14×24×8*
6×12×6 10×22×8 14×28×8
6×12×7 10×25×8 15×22×5
6×14×6 11×17×5 15×22×6
6×15×6 11.2×19.2×6 15×22×8
6×15×8 11.2×21.2×8 15×23×5.7
6×18×8 12×16×4 15×23×10
6.3×16.3×8* 12×16×5 15×25×5
7×12×4 12×16×6 15×25×7
7×12×5 12×17×4 15×25×8*
7×12×6 12×18×4 15×27×6
7×14×5 12×18×5 15×28×10
7×14×6 12×18×6 15×30×5.5
7.1×17.1×8* 12×18×8 15×30×8
8×13×3 12×19×3.5 15×30×10
8×14×6 12×19×5 16×22×4
8×14×8 12×20×5 16×22×5
8×15×5 12×20×6 16×22×6
8×15×6 12×20×8 16×22×7
8×15×8 12×22×5 16×22×8
8×16×6 12×22×5.5 16×24×4
8×16×8 12×22×7 16×24×5
8×18×8* 12×22×8 16×24×6
8×18×10 12×24×6 16×24×8
8×20×10 12×24×8 16×24×10
8×22×10 12×25×8 16×25×5
9×19×6 12.5×22.5×8* 16×26×5
9×19×8* 13×18×5 16×26×6
9.5×14×2.5 13×19×3.5 16×26×8*
Size Size Size
16×26×10 20×26×3.5 22×32×10
16×28×6 20×26×6 22×34×10
16×28×8 20×26×7 22×35×6
16×30×6 20×27×5 22×35×10
17×25×10 20×27×6 22×36×7
17×27×5 20×28×6 22×36×9
17×27×7 20×28×7 22×40×10
17×27×8 20×28×8 22×40×12
17×32×10 20×30×5 22.4×32.4×8*
18×24×4 20×30×6 22.5×31.5×5
18×24×5 20×30×8* 23×30×5
18×24×8 20×30×8.2 23×35×5.6
18×25×5.5 20×30×10 23×35×6
18×25×6 20×32×5 23×35×6.6
18×26×5 20×32×6 23×36×7
18×26×6 20×32×8 23.5×33.5×8
18×26×8 20×32×10 24×30×6
18×26×10 20×33×10 24×32×4
18×26.5×8 20×35×6 24×32×5
18×28×6 20×35×7 24×32×7
18×28×8* 20×35×10 24×36×6.5
18×28×9 20×36×8 24×36×7
18×28×10 20×38×6 24×40×8
18×30×6 20×40×10 24×40×10
18×30×8 20×40×12 25×32×6
18×30×9 20×47×8 25×32×7
18×32×7 21×29.5×5.5 25×32×8
18×32×8 21×26.5×6 25×32.7×6.35
18×34×8 21.7×30×10 25×33×5.5
19×24×5 22×28×4 25×33×5.6
19×25×6 22×28×4.5 25×33×6
19×25×7 22×28×5 25×33×7
19×26×5 22×28×6 25×33×8
19×26×6.7 22×28×8 25×33×10
19×27×5 22×30×5 25×35×5
19×27×6 22×30×5.8 25×35×6
19×27×7.5 22×30×6 25×35×7
19×28×5 22×30×8 25×35×8*
19×28×7 22×31×5.5 25×35×10
19×32×8 22×32×5 25×36×6
19×34×8 22×32×6 25×36×7
19.05×25.4×6.35 22×32×7 25×37×6
20×25×4 22×32×8 25×37×9
20×25×8 22×32×9 25×38×6
Size Size Size
25×38×7 28×43×10.2* 32×38×6
25×38×8 28×44×8 32×38×7
25×38×10 28×48×8 32×40×4
25×40×7 30×36×6 32×40×5
25×40×8 30×37×4 32×40×5.5
25×40×10 30×37×6 32×40×5.6
25×40×11 30×37×6.5 32×40×6
25×42×8 30×37×7 32×40×6.5
25×43×8 30×37×10 32×40×7
25×45×10 30×38×5 32×40×8
25×48×10 30×38×6 32×40×10
25×50×10 30×38×7 32×42×7
25.4×31.7×6.3 30×38×8 32×42×7.3
26×32×4.7 30×40×5 32×42×8
26×32×8 30×40×5.5 32×42×8.2
26×36×5 30×40×6.5 32×42×10
26×36×8 30×40×7 32×45×6
27×34×5 30×40×8 32×45×8
27×35×6 30×40×10 32×45×10
27×36×6 30×42×6 32×46×10
27×40×10 30×42×7 32×47×8
27.5×43×10 30×42×8 32×47×10
28×34×5 30×42×10.2 32×48×8
28×34×5.3 30×43×6.5 32×48×10
28×35×5 30×43×7 32×50×12
28×35×5.5 30×43×10 33×40×4.5
28×35×6 30×43.6×9.5 33×40×5
28×35×10 30×45×6 33×40×6
28×36×4 30×45×7 33×40×8
28×36×5 30×45×8 33×46×6
28×36×6 30×45×10 33×55×15
28×36×7 30×45×10.2* 33.78×46×9
28×36×7.5 30×47×7 34×40×4
28×36×8 30×50×6 34×40×6
28×38×5.6 30×50×8 34×42×5
28×38×7 30×50×10 34×44×10
28×38×7.3 30×50×12 34×45×10
28×38×8 30×52×10 35×41×5
28×38×10 31×47×10 35×42×6
28×40×6 31×47×12 35×42×7
28×40×6.5 31.5×44.3×9.5 35×42×8
28×40×8 31.5×46.5×10.2* 35×43×5
28×40×10 31.75×38.1×6.35 35×43×6
28×43×10 32×36×6 35×43×6.3
Size Size Size
35×43×7 38×50×10 43×53×6
35×43×8 38×51×10 43×63×10
35×43×10 38×52×10 43×66×8
35×45×5 38×53×10 44×38.6×5.3
35×45×8 38×54×10 44×50×8.6
35×45×10 38×55×6 44×50×10
35×46×8 38×55×8 44.5×57.15×9.52
35×46×10 38×55×10 45×50×7.3
35×47×6 38×58×10 45×53×6
35×47×10 38×60×10 45×53×8
35×48×6 38×62×12 45×55×5
35×48×8 38.1×48.1×8 45×55×6.5
35×48×10 40×48×6 45×55×7
35×50×9 40×48×8 45×55×7.3
35×50×10 40×50×6.5 45×55×8
35×50×10.2* 40×50×7 45×55×10
35×50×11.5 40×50×7.3 45×57×8
35×50×12 40×50×8 45×57×9
35×51×10 40×50×9 45×58×10
35×52×8 40×50×10 45×60×9
35×55×10.20 40×52×8 45×60×10
35×55×12 40×52×10 45×60×10.2*
35×58×10 40×55×6.5 45×60×11.4
35×65×12 40×55×7 45×60×12.5
35.5×50.5×10.2* 40×55×7.2 45×62×13
36×43×8 40×55×8 45×63×10
36×48×4 40×55×9 45×63×12
36×48×8 40×55×10 45×65×6
36×50×8 40×55×10.2* 45×65×10
37×47×7 40×56×10 45×65×10.2
37×47×8 40×56×12 45×65×12
37×47×10 40×58×10 45×67×8
37×57×7 40×60×10 45×67×10
37×57×10 40×60×12 45×70×10
38×44×5 40×65×10 45×70×11
38×44×5.3 40×65×12 45×70×16
38×45×7 40.5×49×12 47×57×7
38×45×8 42×47×6 47×57×8
38×46×6 42×50×5.7 47×57×9
38×48×6 42×50×6 47×57×10
38×48×8 42×52×8 47×72×16
38×48×10 42×52×10 48×58×6
38×50×6 42×55×8 48×58×7
38×50×9 42×55×10 48×60×8
Size Size Size
48×60×9 52×60×8 58×72×12
48×60×10 52×62×7 58×80×15
48×60×12 52×62×10 60×68×6
48×63×6 52×62×12 60×68×8
48×63×11.5 52×65×8.5 60×68×12
48×65×10.2 52×70×12 60×68×13.5
48.5×58.7×6 53×63×6.5 60×70×7
48×63×10.2* 53×63×8 60×70×8
50×57×10 53×63×10 60×70×10
50×58×7 53×65×8 60×70×12
50×58×8 53×73×12* 60×72×10
50×60×6.4 53.5×63.5×7 60×73×12
50×60×7 55×63×8 60×75×6
50×60×8 55×63×10 60×75×9
50×60×10 55×65×5 60×75×10
50×60×11 55×65×6.5 60×75×12
50×60×12 55×65×7.5 60×75×15
50×62×6 55×65×8 60×76×12
50×62×9.5 55×65×10 60×80×10
50×62×10 55×65×12 60×80×11
50×63×6 55×68×7 60×80×12
50×63×6.5 55×68×10 60×80×18
50×63×7 55×70×6 60×83×13.5
50×63×8 55×70×7 60×85×12
50×63×10 55×70×9 60×90×15
50×63×15 55×70×10 61×71×6
50×65×6 55×70×11.4 62×72×8
50×65×8 55×70×11.5 62×82×12
50×65×9 55×70×12 63×73×6.5
50×65×10 55×71×12 63×73×8
50×65×10.2* 55×72×8 63×73×10
50×65×12 55×72×12 63×73×12
50×66×12 55×75×8 63×75×8.7
50×68×10 55×75×9 63×75×10
50×70×10 55×75×10 63×78×10
50×70×12 55×75×12* 63×78×12
50×72×9 55×75×15 63×83×12
50×72×10 55×78×7 63×83×15
50×72×12 55×78×10 65×73×5
50×75×10 55×80×10 65×73×6
50×75×12 55×80×12 65×73×7
50×80×12 56×76×12 65×73×8
50.8×63.5×7 57×77×10 65×73×9
50.8×63.5×9.5 58×68×8 65×73×12
Size Size Size
65×75×8 70×90×12 80×95×11.4
65×75×10 70×90×15 80×95×12
65×75×12 70×95×10 80×100×8
65×76×9 70×95×12 80×100×10
65×77×10 70×95×13 80×100×12*
65×78×10 70×100×14 80×100×13
65×78×12 71×91×12 80×100×15
65×78×12.5 72×85×10 80×105×10
65×79×10 72×87×9 80×105×12
65×80×8 73×85×10 80×110×9
65×80×9 75×85×5.5 80×110×15
65×80×10 75×85×8 85×95×6
65×80×11 75×85×10 85×95×7
65×80×12 75×85×12 85×95×8.5
65×80×13 75×90×8.5 85×95×9
65×85×10 75×90×9 85×95×9.5
65×85×12* 75×90×9.5 85×95×10
65×85×15 75×90×10 85×95×12
65×90×12 75×90×12 85×97×9
65×90×15 75×100×12 85×100×10
66.2×76.2×7 75×95×10 85×100×12
67×77×10 75×95×12* 85×100×15
67×87×12 75×95×13 85×105×10
70×78×6 75×95×15 85×105×12*
70×78×10 76×88×9.5 85×105×13
70×80×6.5 76×88×10 85×105×16
70×80×8 76×95×9.52 87×95×11.5
70×80×9 76.5×90.5×10 87×95×12
70×80×10 77×87×12 88×100×15
70×80×12 77×88×12 90×100×6
70×82×10 80×88×8 90×100×8
70×83×10 80×90×6.5 90×100×9
70×84×10 80×90×7 90×100×10
70×85×5.5 80×90×8 90×100×12
70×85×8 80×90×9 90×105×6
70×85×9 80×90×10 90×105×9
70×85×10 80×90×12 90×105×10
70×85×10.5 80×92×7 90×105×12
70×85×11.4 80×92×10 90×110×9
70×85×12 80×93×10 90×110×12*
70×88×9 80×93×12 90×110×13
70×88×10 80×93×13 90×110×15
70×88×12 80×95×9 90×115×9
70×90×10 80×95×10 90×115×12
Size Size Size
90×115×15 106×126×15 120×150×15
90×115×18 110×120×8* 120×160×15
90×120×10 110×120×12 122×135×9
90×120×12 110×125×9 125×135×13
95×105×12 110×125×10 125×137×14
95×110×12 110×125×12 125×138×9.5
95×115×9 110×125×15 125×140×11
95×115×12* 110×130×10 125×140×12
95×115×15 110×130×12 125×140×13
95×125×15 110×130×13 125×140×15
97×105×13.5 110×130×15 125×145×10
100×108×10 110×130×16* 125×145×12
100×108×11.5 110×135×18 125×145×15
100×110×8 110×140×15 125×145×16*
100×110×10 112×132×16* 125×150×13
100×112×9 113×125×14 125×150×15
100×112×10 115×125×12 128×140×15
100×112×14 115×125×13 130×140×12
100×115×9 115×125×15 130×140×13
100×115×10 115×130×12 130×140×14.5
100×115×10.5 115×135×12 130×140×15
100×115×12 115×135×13 130×145×15
100×115×15 115×135×15* 130×150×12
100×120×10 115×140×12 130×150×15
100×120×12* 115×140×15 130×150×16*
100×120×13 118×130×10 130×152×15
100×120×13.5 118×130×12 130×160×20
100×120×15 118×133×9 130×165×10
100×125×9 118×138×16 133×153×15
100×125×12 118.5×138.5×15 135×145×13
100×125×15 120×130×8 135×150×9
100×130×12 120×130×14 135×150×10
105×120×8 120×135×12 135×150×12
105×120×10 120×135×15 135×150×15
105×120×12 120×135×16 135×160×10
105×120×15 120×140×9 135×160×18
105×125×8 120×140×10 135×165×15
105×125×9 120×140×12 140×150×13
105×125×10 120×140×13 140×155×9.5
105×125×12 120×140×15 140×155×10
105×125×13 120×140×16* 140×155×12
105×125×14 120×145×18 140×155×13
105×125×15 120×148×15.5 140×155×15
105×125×16* 120×150×12 140×160×10
Size Size Size
140×160×12 170×200×15 250×270×12
140×160×14 170×200×18 250×280×18
140×160×15 175×185×12 260×280×18
140×160×16* 175×195×14 260×290×18
140×160×18 175×200×15 275×310×15
142×157×10 175×200×18 280×300×15
145×165×13 175×200×20 290×320×18
145×160×15 180×192×14 300×325×18
145×165×15 180×200×14 300×330×18
146×158×12 180×200×15 300×340×20
150×160×13 180×200×16* 304×340×27
150×162×14 180×205×15 305×320×18
150×165×10 180×210×13 310×340×22
150×170×10 180×210×15 320×350×20
150×170×12 185×205×16 320×360×28
150×170×15 185×215×16 330×360×20
150×170×16* 185×220×15 330×360×22
150×175×15 190×210×12 340×370×22
150×180×12 190×210×15 345×365×14
150×180×15 190×210×16 350×380×22
150×180×18 190×215×15 352×382×22
155×165×13 190×215×16 355×385×22
155×175×15 190×220×15 360×390×22
155×180×15 195×215×12 370×400×22
160×175×16 195×220×16 400×430×22
160×180×12 200×220×15 400×436×25
160×180×15 200×220×16 410×380×15
160×180×16* 200×225×15 450×420×26
160×185×12 200×225×20 475×507×18
160×185×15 200×230×18.7 520×550×25
160×190×18.5 204×220×18 530×570×25
165×180×15 210×230×13 650×690×25
165×180×16 210×230×16 720×750×22
165×185×15 210×235×18 860×820×25
165×190×15 210×235×19
165×190×18.5 220×240×12
170×180×11 220×240×16
170×185×12 220×250×18.5
170×190×10 225×250×12
170×190×12 230×250×15
170×190×15 230×260×18
170×190×16* 235×260×16
170×195×15 240×260×12
170×195×16 240×265×18

 

3.Piston  Seal 

Piston seals maintain sealing contact between a piston and cylinder bore. The moving piston rod generates high pressure on the piston seal which increases contact forces between the seal and cylinder surface. For this reason, the surface properties of the sealing surfaces are critical to proper seal performance.

piston seal  section

 

4.Rotary Seal

Rotary seals and shaft seals are used in components with oscillating or rotating parts to keep lubrication fluids in while preventing ingress of mud and water. Trelleborg seals help improve components life and long term performance.  BD seals   Rotary Shaft Seals, including our best-in-class proprietary radial lip seal, Turcon  Varilip    PDR and high quality radial oil seals

Trelleborg's portfolio of rotary seals includes the commonly known radial oil seal, rotary shaft seals, radial and axial lip seals, double-acting O-Ring energized Polytetrafluoroethylene (PTFE) rotary seals for shaft and bore, rubber V-Rings, mechanical face seals / heavy duty seals and many more. Extending component life   Our specialized Rotary and Shaft Seals perform exceptionally well in many different rotary situations. They demonstrate superior low-friction properties and provide excellent resistance to wear.

Rotary and Shaft Seals for many different application   With special seals, like the Radial Oil Seal and Radial shaft seals without a tension ring, the range of applications goes beyond fluid sealing. This special form of Rotary Shaft Seals can also serve as a scraper in situations with helical movement. Learn more about the various applications for Rotary Shaft Seals and Shaft Seals in our   Rotary and Shaft Seals.

 

5.Static  Seal 

Static seals provide the sealing function in all applications in which no movement of the sealing element versus the sealing surface relative to one another occurs. BD seals's offering of sealing solutions for static applications is among the industry's broadest. They are manufactured to metric and imperial international standards, are available in custom sizes, and employ compounds formulated to meet the most stringent industry-standard and customer-specific requirements.