
Hby Buffer Ring Engineering Machinery Seal Polyurethane U-Shaped Ring
Model: HBY
Temperature: -55/+120℃
Speed: ≤1m/s
Pressure: ≤50MPa
Product Introduction
We have a scientific and standardized management model and a strict and effective quality assurance system, adhere to the "diligence, rigorous, pragmatic and innovative" work style, and concentrate on the development, production and application of high-quality vee packing, glyd ring piston seal, das piston seals. Our company always adhere to the business philosophy of continuous innovation, integrity-based, customer first, we will continue to apply new technologies, new processes and new materials. In recent years, our company has always insisted on in-depth refinement and cultivation of corporate culture, and continuously enriched and improved the connotation of corporate culture.
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 know that we only thrive if we could guarantee our combined price tag competiveness and quality advantageous at the same time for Hby Buffer Ring Engineering Machinery Seal Polyurethane U-Shaped Ring. We actively practice social responsibility, protect and improve the natural environment and human environment, and promote the harmonious development of society. We value your inquiry, For more details, please contact us, we will reply you ASAP!
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