
Hydraulic Cylinder PU Buffer Ring Seals Hby
Model: HBY
Temperature: -55/+120℃
Speed: ≤1m/s
Pressure: ≤50MPa
Product Introduction
Over the years, with good product performance, perfect quality assurance, and after-sales service, we have won unanimous praise from customers at home and abroad. In the future, we will continue to make progress to become a well-known radial ptfe oil seal, u cup BS, metric u cup hydraulic seals brand. We establish a comprehensive view of safety, life and production, cherish the lives of employees and their health. We will unswervingly adhere to the fundamental task of accelerating development, transformation and reform.
Description
HBY hydraulic buffer seal, mounted on the pressure side of the piston rod seal, is designed to improve the durability of the piston rod seal by venting the pressure back to the system side. The main parts of the buffer seal are the static lip, dynamic lip, radial slots, and radial channels. The static lip of the seal is optimized with high flexibility to relieve the interstage pressure. The dynamic lip can minimize the friction and back pressure under high-pressure condition. The radial slots of the buffer seal are designed to reduce the risk of blow-by. The radial channels, a vital element in the whole seal structure, facilitate back-pumping and relieve the pressure.
Seal Ring Material | NBR or PU |
Seal Ring Color | Ivory, Red, Blue |
Back Up Ring Material | POM |
Color | Black or White |
Speed | ≤1m/s |
Temperature | -55 to 120℃ |
Pressure | ≤50MPa |
Medium | Mineral oil based hydraulic fluids, barely flammable hydraulic fluids, water, air and others |
Application | Excavators, Standard cylinders, Mobile hydraulics, Presses etc. |
Standard or can fit the groove | Comply with standard of NOK-HBY series |
Pressure | 35 Mpa | 42 Mpa | 50 Mpa |
Max Gap E | E≤0.8mm | E≤0.4mm | E≤0.25mm |

Installation Dimension table based on Metric Size (mm)
d f8 | D H9 | L +0.2 | H |
40~190 | d+16 | 6.3 | 6 |
200~220 | d+21 | 8 | 7.7 |
Feature
● A long service life to minimize maintenance and downtime
● No adhesion to the sliding surface
● Excellent abrasion and wear resistance
● Leak-free performance
● Resistant against high temperature and pressure
● Effective in relieving any pressure built up in the hydraulic system


The company has 5,000 square meters of professional production plants, 2000 square meters of constant temperature and humidity production workshop, dozens (sets) of advanced production equipment.
Own a professional and technical production team and sales service team.
The selection of raw materials are international first-line brand suppliers, In order to ensure product quality, we promise that don't add waste (recycled materials) in the material.


We always adhere to the business tenet of 'Quality First, Service Excellence', and use a complete business system to continue to provide users with high-quality Hydraulic Cylinder PU Buffer Ring Seals Hby and professional services. With full enthusiasm, perfect service and sincere cooperation attitude, we warmly welcome new and old customers to come to discuss cooperation! The development concept we put forward is to guide the overall principle of keeping up with business management activities, and is the business philosophy that should be followed in order to fulfill the mission and realize the vision.
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