Piston Seal Rings
|
property
|
unit
|
test method
|
test parameter
|
typical
value
|
|
specific gravity
|
g/cm3
|
ASTM D792
|
2,16
|
|
|
tensile strength
|
MPa
|
ASTM D638
|
Microtensile
specimen of ASTM
D1708, speed of
testing 0.8mm/s
|
28
|
|
ultimate elongation
|
%
|
ASTM D638
|
Microtensile
specimen of ASTM
D1708, speed of
testing 0.8mm/s
|
300
|
|
Compressive strength 1%
deformation
|
MPa
|
ASTM D695
|
4,5
|
|
|
hardness
|
Shore D
|
ASTM D2240
|
(Shore D - 15 sec)
|
59
|
|
Friction coefficient - dynamic
|
ASTM D 3028 (1)
|
speed 0,08m/s
load 0,1 N/mm2 , sliding
surface steel roughness
Ra = 0,5 micron
|
0,05
|
|
|
Friction coefficient - static
|
ASTM D 3028 (2)
|
|
0,09
|
|
|
Modulus of Elasticity
|
MPa
|
ASTM D638 |
280
|
|
|
Coefficient of thermal
expansion from 25 to 100°C
|
°C-1
|
ASTM E 831
|
16x10-5
|
|
|
Dielectric Strength (short time test)
|
kV/mm
|
ASTM D149
|
35 |
what are Piston Seal Rings?
The piston seal rings of an automobile engine are one of the key parts of the automobile engine. It forms a piston group together with the piston ring, guide ring, and other parts, and together with the cylinder head, forms the combustion chamber, providing good power for the normal operation of the engine.
Piston Rings are typically tempered to have an outward or inward tension to seal against the bore or cylinder of a device. Typical examples of where industrial piston rings are used are in valves, downhole tools, sealing one-time inserted devices, and in some higher dynamic applications like reciprocating piston compressors. Piston rings can also be engineered to provide a seal with better overall capabilities than a typical industrial piston ring.
Sealing effect: Seals can maintain the seal between the piston and the cylinder wall and control air leakage to a minimum.
Thermal conductivity: The piston seal can disperse the high heat generated by combustion to the cylinder wall, which can cool the piston.
Oil control function: The piston rings can scrape off the oil attached to the cylinder wall and maintain normal oil consumption.
Supporting function: The seal moves up and down in the cylinder, and its sliding surface is entirely borne by the ring, which prevents the piston from directly contacting the cylinder and plays a supporting role.
The main features of piston seal rings
1
Good pressure resistance, wide working pressure range, the maximum working pressure can reach 32 MPa.
2
It has good temperature resistance and is suitable for a wide temperature range, with the highest temperature generally reaching 200°C.
3
Strong wear compensation ability. It has strong wear compensation ability and is widely used in various power machinery.
4
Piston rings made of self-lubricating materials such as graphite or filled PTFE can operate without oil.
Configuration
Standard and custom sizes range from 1/2" OD to over 90" OD.
The joints include stepped, square, butt, angle, miter, hook ladder, miter, lock ladder, and hook lock.
Available in one-piece or multi-piece designs - 1 ring, 2 rings, 3 rings, with springs.
Can be made for existing grooves.
Can be manufactured with controlled leak rates to meet design standards.
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