Blog Archives
PISTON SEAL KT5
STANDARD SEAL DIMENSIONS
DESCRIPTION
The KT5 compact piston seal series type is designed with a central polyurethane element and two side anti-extrusion rings. The assembling between the polyurethane element with high elastic modulus and the two elastomer rings with high hardness enhances stability of the sealing even at heavy duty applications. Compared to rubber, the abrasion is also reduced due to the use of polyurethane, therefore extending the life of the seal. The friction (first operation and in working condition) is also considerably reduced, due to geometric shape of the seal, having better performance than NBR.TECHNICAL DATA
Pressure: from 0 to 400 barSpeed: < 0.8 m/s Temperature: from – 30° C to + 100 ° C with peaks up to + 110° C Fluids: mineral oils
MATERIAL
The materials used for the construction of this type of seal are:– polyurethane for the central element, hardness 93 Shore A
– the backup rings in TPE elastomer 63 Shore D.
ASSEMBLING
This seal can be assembled both in closed groove on a mono-block piston and in open groove on a twopart piston. Avoid machining scores on the piston which May damage the sealing during the installation The use of grease in the piston is recommended for easier assembling.
PISTON SEAL KT3
STANDARD SEAL DIMENSIONS
DESCRIPTION
The KT3 seal is designed to be a piston seal with interchangeable seats ISO 6547. It consists of only three elements: a polyurethane seal at the middle and two side wiper rings in glassfilled polyacetal resin. This system doesn’t need anti-extrusion supports, Thanks to the high modulus of elasticity and the hardness of the central element higher hardness then Nitrile rubber NBR. The friction (first operation and in working condition) is low thanks to the particular geometric shape of the seal.TECHNICAL DATA
Pressure: from 0 to 300 Bar with peaks up to 400 Bar at 60° C.Speed: 0.8 m/s
Temperature: from – 30° C to + 100 ° C
Fluids: mineral oils
MATERIAL
The materials used for the construction of this type of seal are:– polyurethane for the central element, hardness 93 Shore A
– glass-filled polyacetal resin (POM) for the side elements
ASSEMBLING
This seal can be assembled both in closed groove on a mono-block piston and in open groove on a twopart piston. Avoid machining scores on the piston which may damage the sealing during the installation.
PISTON SEAL KT1
STANDARD SEAL DIMENSIONS
DESCRIPTION
The KT1 compact seal is made of a central unit in NBR working as a seal, two side supports, working as anti-extrusion ring, and two external guide rings, keeping aligned the piston in the cylinder.TECHNICAL DATA
Pressure: from 0 to 300 bar with peaks till 400 bar at 60°CSpeed: < 0.5 m/s Temperature: from - 30 °C at +100 °C Fluids: Mineral oils
MATERIAL
The compounds used to manufacture this seal type are the following:• The central units is made of NBR, the hardness is
70 Shore A ± 3
• The sides support are made of a thermoplastic elastomer (TPE)
• The external wear rings are made of polyacetalic resin (POM)
ASSEMBLING
assembling of this seal can be carried out in either closed groove in a mono-block piston, or in open groove in a two-parts piston. The assembling has to be done as follows:• Rubber element;
• Supports;
• Wear rings.
Avoid machining scores on the piston which may damage the rubber unit during the installation.
PISTON SEAL KT4
STANDARD SEAL DIMENSIONS
DESCRIPTION
The KT4 compact seal is made of a central unit made of NBR working as a seal, two side supports, working as anti-extrusion ring, and two external guide rings, keeping aligned the piston in the cylinder.TECHNICAL DATA
Pressure: from 0 to 300 bar with peaks till 400 bar at 60°CSpeed: < 0.5 m/s Temperature: from - 30 °C at +100 °C Fluids: Mineral oils
MATERIAL
The compounds used to manufacture this seal type are:• The central units is made of NBR, the hardness is 70 Shore A ± 3
• The sides support are made of thermoplastic elastomer (TPE)
• The external wear rings are made of polyacetalic resin (POM)
ASSEMBLING
The assembling of this seal can be carried out in either closed groove in a mono-block piston, or in open groove in a two-parts piston. The assembling has to be done as follows:• Rubber element;
• Supports;
• Wear rings.
The piston must not have machining scores which may damage the rubber unit during the installation.
PISTON SEAL DT6
STANDARD SEAL DIMENSIONS
DESCRIPTION
The DT6 piston seal is composed of two rings. The dynamic seal is a filled PTFE ring with the required shape, the static seal is an O-Ring also working as energizer.
TECHNICAL DATA
Pressure: < 600 bar Speed: < 15 m/s Temperature: from - 30° C up to + 100° C for the standard type with nitrile OR. Short peaks till 120° C. For a different temperature range, the O-Ring should be replaced by a more suitable model.
MATERIAL
Bronze-filled PTFE for the standard type, and NBR for the O-Ring.
PISTON SEAL DT11
STANDARD SEAL DIMENSIONS
DESCRIPTION
The DT11 seal has a double profile in the in the dynamic part, and two small steps in the static part where the Q-ring is housed. The Q-ring energizes the seal and provides a perfect sealing performance at low and high pressure. The shape of the central double profile prevents hydrodynamic pressures on the seal and the resulting blow-out effect.
TECHNICAL DATA
Pressure: < 250 Bar with a C0-type material at 93 Shore A, at a temperature of 60° C. < 400 Bar a D0-type material, at 98Shore A, at a temperature of 60° C. Speed: < 0.8 m/s Temperature: from – 35° C to + 100 ° C with peaks up to 110° C. Fluids: mineral oils
MATERIAL
The sealing parts are in polyurethanes with different hardness, according to the specific operating pressures.
ASSEMBLING
Cutting edges or flash must be removed in the housing of the seal. Ensure a lead-in chamfer in the bore to facilitate the piston installation.
PISTON SEAL DT9
STANDARD SEAL DIMENSIONS
DESCRIPTION
The DT9 seal type shows a double profile on the dynamic side and a surface with two small steps on the static side, where the o-ring is housed. The presence of the o-ring, which energizes the seal, ensures a perfect seal performance at low and high pressure. The special double profile avoids any Hydro-dynamic pressure on the sealing part and the consequent blow-by effect.
TECHNICAL DATA
Pressure: < 250 bar with standard material 93 Sh A at 60° C (C0) Pressure: < 400 bar with alternative material 98 Sh A at 60° C (D0) Pressure: < 500 bar with alternative material 55 Sh D at 60° C (E0) Speed: < 0.5 m/s Temperature: from - 35° C to + 100° C, with peaks at 110° C Fluids: mineral-based fluids
MATERIAL
The chosen material is polyurethane, with hardness according to the working pressure. The o-ring is in NBR hardness is of 70 Shore A.
ASSEMBLING
Remove any cutting edges and flash in the housing of the seal. Ensure a lead-in chamfer in the bore to facilitate the piston installation.
PISTON SEAL MA20
STANDARD SEAL DIMENSIONS
DESCRIPTION
The MA20 piston seal type is similar to the MA8 type, but it has an acetylic resin wear ring to mitigate possible misalignments and avoid extrusion. A RR retaining ring made of thermoplastic resin prevents seal extrusion during the cycle inversion.
TECHNICAL DATA
Pressure: < 400 bar at a temperature of 60° C Speed: < 0.5 m/s Temperature: from - 35° C to + 100° C with peaks till +110° C Fluids: mineral fluids and oils
MATERIAL
The proposed
MATERIAL
is polyurethane with high modulus of elasticity, low compression set and high abrasion resistance. The wear ring is made of a acetylic resin reinforced with fibreglass. The retaining seal is made of thermoplastic resin.ASSEMBLING
Avoid all cutting edges and flash on the piston where the seal is housed. A lead-in chamfer in the groove will facilitate the piston insertion. Lubricate the seal before installation.
PISTON SEAL MA11
STANDARD SEAL DIMENSIONS
DESCRIPTION
The MA11 seal type is specially designed for heavy duty applications. When the coupling clearance between bore and piston cannot be reduced and the pressure is very high – above 250 bar – the MA11 seal type, thanks to a strong anti-extrusion ring, is among the most appropriate of seal types.
TECHNICAL DATA
Pressure: < 400 bar at a temperature of 60° C Speed: < 0.5 m/s Temperature: from - 35° C till +100° C Fluids: mineral oils
MATERIAL
The
MATERIAL
used for the seal is polyurethane at 93 Shore A with high elasticity module. The anti-extrusion ring is made of acetylic resin reinforced with fibreglass and with high tensile strength.ASSEMBLING
The
ASSEMBLING
of this seal is done in semi-open groove. The anti-extrusion ring should be installed after the seal. It is important to remove any flash or cutting edge on the piston not to damage the seal during the overlapping.
PISTON SEAL MA8
STANDARD SEAL DIMENSIONS
DESCRIPTION
The MA8 seal type has been conceived to work on the piston and it can be used for simple or double effect. Its has asymmetrical lips which ensure a continuous contact with the bore, even in case of high misalignments. The installation is done in semi-open groove by overlapping, since the material has a high modulus of elasticity.
TECHNICAL DATA
Pressure: < 400 bar at a temperature of 60° C
Speed: < 0.5 m/s
Temperature: from – 35° C to + 100° C, with peaks till 110° C
Fluids: mineral-based oils and fuels
MATERIAL
The material used is polyurethane with a high modulus of elasticity, low compression set and high wear resistance. Its hardness is 93 Shore A ± 2.
ASSEMBLING
Remove any flash or cutting edges on the piston where the seal is housed. Provide a lead-in chamfer in the bore to have an easier piston insertion. Lubricate the packing before installation.