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Hydraulic Packings

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Hydraulic Packings

Product name
[Application]
Profiles
(Left section)
Material codes Characteristics Field of application
GPY-Packings
[Piston packings]
parts RN919 For those applications, the SKY-packings are used and the improvement of durability becomes an essential issue. The GPY-packings for pistons and the GNY-packings for rods are recommended.
With the RN919 wear resistant material and larger cross-sectional area than the SKY- packings of the same dimensions, the GPY piston packings prove to be free from damage by a back pressure and the GNY rod packings obtain higher sealing capability and optimum sealing performance against eccentric movements.
# Basic cylinders
# Cylinders for construction and industrial vehicles
GNY-Packings [Rod packings] parts RN919
RGY-Packings [Piston & rod packings] parts RN923 The grooves of RGY piston packings and RNY rod packings are compatible with those for the SKY-packings. RGY-packings are designed to withstand back pressure and provide longer service time by adopting an improved wear resistant material.
RNY rod packings are designed exclusively for sealing rods. RNY rod packings made of a highly elastic compound achieve good sealing performance against eccentric movements.
# Basic cylinders
# Cylinders for construction machine tools and industrial vehicles
# Cylinders for machine tools and industrial vehicles
RNY-Packings [Rod packings] parts RN922
(T)SGY-Packings [Piston packings] parts RN812 The groove dimensions of SGY & SNY packings are compatible with those of the SKY-packings.
Service temperature range of -45℃ to +100℃ allows cylinders for use in multiple temperature conditons -in both regular and severe cold euvironments- without changing packings.
SGY & SNY-packings also feature exceptionally low stick slip. Due to the nature of the application, the material is required to have a moderately low material hardness.
Conduct verification tests in the case of SGY & SNY-packings are used in high pressure and/or high frequency conditions.
# Crane and aerial work platforms
# Cylinders for rigid conditions
(T)SNY-Packings
[Rod packings]
parts RN809
SKY-Packings [Piston & rod packings] parts RN906
(RF905)
(RF907)
SKY-packings are specified as the basic hydraulic packing in Japan since 1966.
SKY-packings are multiply applicable to both pistons and rods.
Flexible and easy installing properties fit to one piece groove and eliminate parts of divided grooves. Compacter cylinder design with lower cost is achievable by SKY packings.
# Basic cylinders
# Cylinders of low hydraulic pressure
# Cylinders for construction machine tools and industrial vehicles
KY-Packings [Piston & rod packings] parts RN906
(RF905)
(RF907)
KY-packings replace V-packings with superior sealing performance, compacter groove dimensions and easy installation. The largest cross-sectional area of KY- packings assures stable sealing performance for vast applications. Abundant dimensional assortment is another plus. # Basic cylinders
# Hydraulic press and injection molding machine
# Cylinders for construction machine tools and industrial vehicles
RGU-Packings [Piston packings] parts RN923 As double acting packings, the RGU-packings have a unique seal lip shape and provide identical sealing performance to U-packings on compacter sized pistons. Frequently be in service as a combination system with the PWL-bearings which offer multi-functions-bearing & back-up ring. # Cylinders for agricultural machines
# Cylinders for machine tools and industrial vehicles
# Cylinders for light weight construction machines
HSD-Packings [Piston packings] parts RN906 HSD-packings are double acting packings and enable to minimize the size of pistons.
Stable sealing performance without damage from twisting or rolling, unlike O-rings, is obtainable.
# Cylinders for agricultural machines
# Cylinders for industrial vehicles
PENTA-Seals
PS
[Rod packings]
parts RN906
(RF905)
The grooves of PENTA -Seals are compatible with those of O-rings specified by JIS B2401 P line.
In addition to the superior sealing performance, PENTA -Seals prevent damage from twisting or rolling.
# Miniature cylinders
# Control valves, solenoid valves
NMY-Packings [Rod packings] parts RN906 NMY-packings are small in cross sectional area and compatible with the grooves of O-rings specified by JIS B2401 P line. NMY packings are far superior in sealing performance and friction characteristics over O-rings. # Miniature cylinders
# Control valves, solenoid valves
STK-Seals
(STR type)
[rotation seals]
parts PT151 S-FLON (PTFE) seals and back-up rings are combined to achieve low friction characteristic and of elimination stick slip even at low pressure/speed conditions.
Moderate sealing performance comparing with U-packings due to the PTFE plastic seals which have higher rigidity and lower elasticity than rubber materials.
Good practice is needed to prevent scars on the delicate surface of S-FLON seals.

# ST type is applicable to common & general applications with diversified dimensions.
# STS type is designed for low friction/pressure cylinders, with small cross sectional area.
# STG type is well accepted by construction machines and heavy machineries sectors.
# SMJ type is available as rod seals with optimum sealing performance and durability.
# STR type is designed for rotary joints.
# Rotary joints
# Swivel joints
ST-Seals [Piston seals] parts PT111 # Cylinders for machine tools and industrial vehicles
SMJ-Seals [Rod seals] parts PT154 # Cylinders for general industrial machines
# Cylinders for construction equipment
# Cylinders for special applications

# The material codes specified in ( ) are of heat resistant materials.
# The heat resistant material for the SKY-300F, KY-250F and their larger sized products is RF907 instead of RF905.
# RGU packings have been renovated to improve stability of sealing performance.



Please refer to Sakagami product catalogue for detailed information.


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