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The reciprocating rod seal is one of the most critical elements in hydraulic equipment. Rod seals for hydraulic cylinders seal the system pressure on the rod side of the cylinder against the atmosphere. The seals need to withstand high pressures during the stroke phase as well as the position holding operation of the cylinder.

Rod seal or Gland seals as they are often called, exist in a wide variety of different types. When choosing a rod seal, it is important to define the area of application and the seals need to be chosen as per their specification and design requirement. The individual profile design show specific behaviors and performance which need to be in line with the application´s requirements. There are single or composite designs of rod sealing systems.

A leaking rod seal can cause accidents, operational problem as well as environmental pollution. In addition to normal wear and aging, this seal is directly affected by irregularities on the rod surface. These seals are at times subjected to high and low pressure, often in combination with alternating high and low temperature. Alpha Hydraulics has chosen some of the most versatile seal designs to meet these demanding requirement specifications. In some systems a secondary rod seal or buffer seal is also used to reduce the load on the primary rod seal.

Basic materials: Polyurethane, Nitrile, Fluorocarbon, Silicone, EPDM, fabric reinforced elastomers, PTFE and its compound and other engineering plastics.

Find below Alpha's various seal profiles for Rod or Gland applications.

 

AH/ Style
 Illustration
Material
Bar/ Psi
Temp
Metric
Application
AH 5043
PTFE-Brz/ NBR
800 bar
-500C+2500C
Metric
Mobile hydraulics, standard cylinders
AH 5013
PTFE-Brz/ NBR
800 bar
-500C+2500C
Metric
Piston, Plunger& Rod for Dynamic& static Sealing
AH 5130
PTFE-Brz/Silicon
400 bar
-500C+2500C
Metric
Piston, Plunger& Rod for Dynamic& static Sealing
AH 5403
PTFE-Glass filled/ NBR
400 bar
-500C+2500C
Metric
Mobile hydraulics, standard cylinders
AH 5XXX
PTFE-Glass filled
400 bar
-500C+2500C
Metric
Piston, Plunger& Rod for Dynamic& static Sealing
AH 5388
Polyurethane
400 bar
-220C+2300C
Metric/inch
Mobile hydraulics, standard cylinders
AH 5389


Polyurethane/
NBR

400 bar
-220C+2300C
Metric/inch
Mobile hydraulics, standard cylinders
AH 5390
Polyurethane
400 bar
-220C+2300C
Metric/inch
Mobile hydraulics, standard cylinders

 

 

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