The Requirements And Details That Hydraulic Cylinder Seals Should Meet
2023-12-11
The requirements and details that hydraulic cylinder seals should meet
The requirements that hydraulic cylinder seals should meet
(1) Hydraulic cylinder seals should have good sealing performance within the pressure range of 28MPa and 100 temperature, and can automatically improve the sealing performance as the pressure increases.
(2) The friction between the sealing device of the hydraulic cylinder seal and the moving parts should be small, the friction coefficient should be stable, and there should be no creeping phenomenon at low speeds.
(3) Hydraulic cylinder seals should have strong corrosion resistance, not easy to age, long working life, good wear resistance, and can automatically compensate to a certain extent after wear.
(4) Hydraulic cylinder seals should be simple in structure, easy to use and maintain, and low in price.
Hydraulic cylinder seals specifically include those seals?
Hydraulic cylinder seals include dust ring, piston rod seal, piston seal, static seal, guide support ring, as shown below
Detailed introduction of hydraulic cylinder seals
(1) Hydraulic cylinder seal-dust ring
The dust ring is installed on the inner side of the hydraulic cylinder end cover, and the main sealing lip is exposed to the air. Prevent external dust, rain, frost and other dirt from entering the inside of the sealing mechanism, affecting the viscosity of the hydraulic oil and scratching the sealing lip of the internal seal.
The dust-proof ring has the characteristics of good wear resistance, anti-extrusion, impact resistance, small compression deformation and easy installation.
(2) Hydraulic cylinder seal-piston rod seal
The piston rod seal is one of the main pressure-bearing components in the hydraulic cylinder. It is one-way pressure-bearing, with greater pressure, and is directly in contact with hydraulic oil.
The piston rod seal is installed inside the dust-proof seal inside the end cover of the hydraulic cylinder to prevent the hydraulic oil from leaking. It is required to have good pressure holding performance in a static state, high pressure bearing in motion, good sealing performance, low friction coefficient, and strong anti-extrusion ability.
(3) Hydraulic cylinder seal-piston seal
The piston seal is the main seal in the hydraulic cylinder, bearing pressure in both directions, and is one of the most important seals that the hydraulic cylinder can withstand the pressure value.
The piston seal requires good sealing effect, good pressure holding effect in static state, strong pressure bearing capacity during movement, anti-extrusion, low friction coefficient, long service life, etc.
(4) Hydraulic cylinder seal-guide support ring
The main function of the guide support ring is to support the piston rod and the piston, guide the piston to move in a straight line, and prevent the uneven pressure of the seal caused by the non-vertical force of the hydraulic cylinder, resulting in poor sealing effect and short service life.
The guide belt and support ring directly affect the use effect and life of the piston seal and piston rod seal, so the requirements on the guide belt and support ring are also higher, such as low friction coefficient, high hardness, and long service life.
(5) Hydraulic cylinder seal-static seal
The static seal of the end cover is to prevent the hydraulic oil from leaking from the gap between the end cover and the cylinder, and is pressured on one side; the static seal of the piston is pressured in both directions to prevent the hydraulic oil from leaking between the piston and the piston rod.
Static sealing requires strong anti-extrusion ability and good sealing effect.
(6) Hydraulic cylinder seal-retaining ring
The retaining ring is used in conjunction with the piston rod seal, piston seal or static seal ring, which can effectively prevent the extrusion of the seal ring and increase the pressure bearing capacity of the seal ring.
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