HBY seals are a type of hydraulic seal, specifically buffer seals,
designed to work with rod seals in hydraulic systems. They are used
to prevent excessive pressure build-up between the buffer seal and
the primary rod seal, and also to protect the rod sealing area from
pressure spikes. HBY seals often incorporate an anti-extrusion
ring, typically made of a hard material like POM or PA, to resist
extrusion under high pressure and shock loads.
Here's a more detailed breakdown.
Function:
HBY seals act as a buffer, absorbing pressure fluctuations and
preventing pressure traps that can damage the primary rod seal.
They also allow oil to reach the primary seal at low pressure,
preventing it from running dry.
Structure:
They typically consist of a soft polyurethane (PU) sealing element
and a harder anti-extrusion ring made of POM or PA. The sealing lip
is often designed with a notch or special shape to allow for
pressure release and prevent pressure traps.
Applications:
They are commonly used in heavy-duty hydraulic applications,
particularly in construction machinery, and are suitable for both
dynamic and static sealing.
Advantages:
HBY seals offer several benefits, including protection against
pressure spikes and extrusion, long service life, and easy
installation. They can also improve the overall durability and
performance of hydraulic systems.
Materials:HBY seals are typically made of polyurethane (PU) for the
sealing element and either POM (polyoxymethylene) or PA (polyamide)
for the anti-extrusion ring.
Pressure Range:
HBY seals can handle a wide range of pressures, from low to high,
and can be used in both low and high-pressure applications.
In essence, HBY seals are a specialized type of hydraulic seal
designed to enhance the performance and reliability of hydraulic
systems, particularly in demanding applications where pressure
fluctuations and extrusion are a concern.
