Rod Seals

Rod seals for hydraulic cylinders

Rod seals are considered the most critical element of a cylinder sealing system. They prevent the leakage of fluid from within a hydraulic cylinder to the outside as the rod cycles back and forth (dynamic pressure sealing). Rod seals work together with wiper seals to protect a hydraulic system against external contaminants such as dirt and outside weather conditions.

Rod seals are static seals installed in the glands or housings. They maintain a seal with the piston rod in dynamic motion.

In heavier duty applications, a rod seal can be combined with a secondary buffer seal for a more robust sealing effect.

UK Seals supply a comprehensive range of rod seal designs that offer outstanding protection from ingress of media.  These include PTFE (Teflon) seals, U Seals, fabric Seals, V packs and application–specific designed seals made from high-performance elastomers and engineering plastic materials. Our range offers maximum durability and sealing performance. Compounds available include Nitrile rubber, Polyurethane, or Fluorocarbon Viton.

Example Rod Seals


RFD rod seal
RFD rod seal profile
RFD (Single Acting Split Housing)
Heavy duty single acting seal with the advantage of an anti-extrusion ring. It comprises of a rubberized fabric which gives strength and durability to a moulded nitrile energizer. It needs a Split housing. The seal section is pre-loaded by the housing when installed to ensure effective sealing at low pressure. When the pressure increases, the nitrile energizes the fabric to increase the sealing area and the efficiency of the seal. The strength and durability of the rubberized fabric combined with its ability to retain lubricant, keeps friction and wear to a minimum. A reinforced plastic anti-extrusion ring at the internal heel of the seal protects against damage by the extrusion.

MAX. OPERATING CONDITIONS:
Temp. range: -40°C to +100°C (up to +200°C on request)
Pressure: 400 BAR
Speed: 0.5 m/s

MAX. SURFACE ROUGHNESS:
Static: 0.8 µmRa Dynamic: 0.4 µmRa

APPLICATION:
Medium to heavy duty hydraulic presses. Steel mills, Earth moving equipment. Requires split gland.

COMPATIBILITY:
Mineral oils, Water soluble & Water glycol fluids.
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RTA rod sealRTA rod seal profile
RTA (Single Acting)
Suitable for light to medium duty hydraulic cylinders, and cylinders with small groove dimensions enabling a compact gland. The RTA rod seal combines an NBR O-ring energizer and a PTFE inner added with a filler to increase the seal’s resistance to high pressure. Bronze tends to be used as the filler but Glass and Graphite filled PTFE RTA seals can be made. This seal can be easily fitted in a single gland. It is also suitable for a 2 piece gland application. The Bronze filled PTFE inner seal ring, when in contact with the Piston rod, ensures a stick slip free movement and reduces the friction to a minimum. The filler increases the strength in the seal ring to prevent it from extruding and can withstand pressure as high as 400 BAR.

MAX. OPERATING CONDITIONS:
Temp. range: -30°C to +100°C (up to +200°C on request)
Pressure: 400 BAR
Speed: 10 m/s

MAX. SURFACE ROUGHNESS:
Static : 1.6µmRa Dynamic : 0.4µmRa

APPLICATION:
Medium to heavy duty cylinders. Stick slip free operation. Machine tool. Injection moulding machines. Earthmoving equipment. Can also be used in conjunction with UA/UB Rod seals for heavy duty application.

COMPATIBILITY:
Mineral oils, Water soluble & Water glycol fluids.
[Enquire...]
RUB rod seal

RUB rod seal profile
RUB (Single Acting)
A flexible seal suited for sealing Piston rods. The additional O-Ring profile at the bottom provides a back-up to the main sealing lip, offering lubrication, and abrasion resistance – it remains unaffected with varying pressures. Available in nitrile (NBR) up to 160 BAR and Polyurethane for 300 BAR. Due to polyurethane’s excellent wear resistance, the life expectancy is 3 times that of NBR.

MAX. OPERATING CONDITIONS:
Temp. range: -40°C to +90°C (up to +200°C on request)
Pressure: PU5/b - 300 BAR
NT6/b: 160 BAR.
Speed: 0.5 m/s

MAX. SURFACE ROUGHNESS:
Static: 1.6 µmRa Dynamic: 0.4 µmRa

APPLICATION:
Light to medium duty hydraulic cylinders. Can also be used in conjunction with SS Style Rod seals for heavy duty applications.
Mining Equipment. Hydraulic props. & presses.

COMPATIBILITY:
Mineral oils, Water soluble & Water glycol fluids.
[Enquire...]

Other profiles / Non Standard Rod Seals

LC

LC
PFA

PFA
PUK

PUK
RBA

RBA
RBB

RBB
RBC

RBC
RBD

RBD
RBF

RBF
RBG

RBG
RBH

RBH
RBI

RBI
RBJ

RBJ
RBK

RBK
RBM

RBM
RBN

RBN
RBP

RBP
RBQ

RBQ
RBR

RBR
RBY

RBY
RFE

RFE
RTB

RTB
RTC

RTC
RTE

RTE
RUA

RUA
RUD

RUD
RUE

RUE
RUF

RUF
RUG

RUG
RUH

RUH
RUI

RUI
RUJ

RUJ
RUK

RUK
RUL

RUL
RUM

RUM
RUN

RUN
RUP

RUP
RVC

RVC
RVI

RVI
SFC

SFC
SFD

SFD
SFF

SFF
SNB

SNB
SNC

SNC
SUB

SUB
SUC

SUC
SUD

SUD
SUE

SUE
SUF

SUF
SUG

SUG
SUH

SUH
SUI

SUI
SUK

SUK
SUL

SUL
SUM

SUM
SUN

SUN
SUO

SUO
SUP

SUP
SUQ

SUQ
SVA

SVA
Hydraulic Seals information

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