Piston Seal P12

DESCRIPTION
Piston seal P12 is a two-way seal for heavy-duty applications.
It consists of one sliding ring made of PTFE, one preloading element made of rubber, and two rings for protection against extrusion into the gap made of POM material.
This seal is characterized by high pressure resistance up to 60 MPa, good extrusion protection even with large gaps, high resistance to abrasion and low friction without stick-slip effect.

APPLICATION
Earth moving equipment
Excavators
Lifting machines
Industrial vehicles
Presses
Heavy duty cylinders

MATERIAL

Standard material
Material Set Code SN121 SN221
NBR 85 ShA N4280 N5180
PTFE Bronze T1004 ‘T1004
POM P6221 P6221

OPERATING CONDITIONS

Pressure, Speed
Working pressure, max 50 Mpa 50 Mpa
Running speed v,max 1,5 m/s 1,5 m/s
Medium, Working Temperature
Material Set Code SN121 SN221
Hydraulic oils: HL, HLP -30.. +100 ˚C -50.. +80 ˚C
Mineral greases -30.. +100 ˚C -50.. +80 ˚C

DESIGN RECOMMENDATION

Max. admissible gap , emax, mm
Profil Size Max operating pressure
S mm 16 MPa 26 MPa 32 Mpa 40 Mpa
7 0,8 0,7 0,5 0,3
7,5 0,9 0,8 0,5 0,3
11,5 1 0,9 0,6 0,4
Surface finish*
Surface roughness Ra Rmax
Sliding surfaces 0.05 .. 0,3μm ≤ 2,5 μm
Groove base ≤ 1,6 μm ≤ 6,3 μm
Groove flanks ≤ 3,0 μm ≤ 15 μm
Chamfer ≤ 4,0 μm ≤ 16 μm

*Contact area Mr = 50% to 90% at cutting depth c=Rz/2 and reference line Cref=0%

Profile size, S, mm Lead-in chmfers, C, mm
7 6
7.5 7
11.5 9
ØD
Ød
H
L
Material
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ØD
Ød
H
L
Material
Order code
155
132
15.5
16
SN221
P12-215148
160
137
15.5
16
SN221
P12-215149
165
142
15.5
16
SN221
P12-215150
170
147
15.5
16
SN221
P12-215151
180
157
15.5
16
SN221
P12-215152
200
187
15.5
16
SN221
P12-215153
12
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