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Chevrons packing
TECHNICAL DATA
| U-Ring | Profile | Material | Bars | Temperature | Speed |
| Chevron packing |  | NBR / fabric + POM | ≤400 | -30 to +100 ºC | ≤0,50 m/s |
| Chevron packing | | FPM / fabric + POM | ≤400 | -15 to 150 ºC | ≤0,50 m/s |
QUICK LINKS
CHEVRONS PACKING
A rod chevrons packing is a five or seven piece single acting sealing set which consists of reinforced cotton fabric parts and nitrile rubber middle rings. Sometimes, the bottom part is POM-made. By removing or adding “V” parts, it is possible to increase or decrease the height of the seal. These packings are recommended to be used in rod applications and to be assembled in open seal housings.
ADVANTAGES
- Adjustable housing height thanks to installation in open grooves
- Functions even with poor surfaces
- Easy installation and removal
- Long service life
- Very good sealing performance both in high and low pressures
APPLICATIONS
Used especially in hard working conditions such as iron and steel industry, mining equipments, marine hydraulics, scrap cutters and special cylinders where the working conditions are difficult to forecast.
WORKING CONDITIONS
Media | Mineral oils (DIN 51524) | HFA and HFB | HFC |
Temperature | -30 °C to +105 °C | +5 °C to +60 °C | -30 °C to +60 °C |
Pressure | ≤400 Bar | ≤400 Bar | ≤400 Bar |
Speed | ≤0,5 m/sn | ≤0,5 m/sn | ≤0,5 m/sn |
Surface roughness | ||
| Ra | Rmax |
Dynamic surface | ≤0,4 μm | ≤3,2 μm |
Groove base | ≤1,6 μm | ≤6,3 μm |
Groove flanks | ≤3,2 μm | ≤16,0 μm |
Permissible gap (S max.) | |
Pressure | S (mm) |
P≤350 | 0,45 |
350<P≤600 | 0,25 |
INSTALLATION
Being assembled in adjustable housing , the groove housing should have an adjustability of 7.5% of the seal height. If there is a requirement of being used in closed housings, individual parts should be cut with 45° angle and staggered by 75° angle at installation. When strongly squeezed, the flexibility of the sealing set may be substantially reduced. This could cause excessive friction force , high wear and vibrated operating under low pressures. It is not recommended to overpress the rings during assembly because it will lead to high friction.
It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation all individual parts of the seal must be oiled with system oil.
Notes:
For applications that require high temperatures, reinforced cotton fabric + FKM for header and PTFE for “V” rings can be used.