KVT Pinch Sleeves

for directly operated pneumatic pinch valves (other dimensions and material combinations available on request)

KVT-QM-01790_QM

KVT
No.
Material
Trade name
Material
(Inside)
Material
(Outside)
T max.
[°C]
E Remarks1)
NN Natural Rubber NR NR 80 *

NN = Standard version

NR: Very good mechanical and elastic properties, very good abrasion resistance.


Medium resistance to seawater, acids and bases of medium concentration.



WN Natural Rubber
(inside FDA, black)
NR-L sw NR 80  
LN Natural Rubber
(inside FDA, white)
NR-L h NR 70  
HH Natural Rubber
"heat resistant"
NR-H NR-H 90  
IN Butyl-Naturkautschuk-Combination
(Isobutylen-
Isopren
)
IIR NR 90   Moderate resistance to seawater, acids and bases of medium concentration.
SN Styrol-Butadien-Kautschuk
(
Buna EM)
SBR NR 80   Good resistance to freon, glycols and brake fluids.
 
EE Ethylen-Propylen-Dien-Terpolymere
(
Buna AP)
EPDM EPDM 120 *

Good resistance to water, glycol, aggressive chemicals and steam.

ÄE Ethylen-Propylen-Dien-Terpolymere
(inside FDA, black)
(
Buna AP)
EPDM-L sw
EPDM 120 *
PE Ethylen-Propylen-Dien-Terpolymere
(inside FDA, white)
(Buna AP)
EPDM-L h
EPDM 110  
 
BN Acrylnitril-Butadien-Rubber / Nitrilrubber
(
Perbunan)
NBR NR 80 * Good resistance to oils, animal and vegetable fats, hydrocarbons and gas.

GN

Acrylnitril-Butadien-Rubber / Nitrilrubber
(inside FDA, black)(Perbunan)

NBR-L NR 80 *
DN Acrylnitril-Butadien-Rubber / Nitrilrubber
(inside FDA, white)
(Perbunan)
NBR-L h
NR 80  
 
CN Polychloropren-Rubber
(
Neoprene)
CR NR 80  

Good resistance to grease, ozone, weathering, freon. Lightfastness and flame resistance.

MN Chlorosulphonyl-Polyethylen-Rubber
(
Hypalon)
CSM NR 80   Chlorine gives the vulcanizate flame retardancy and mineral oil resistance, but also reduces cold flexibility.
FC Fluor-Rubber
(
Viton)
FPM,
FKM
CR 120   Very good resistance to mineral oils, animal and vegetable fats, chlorinated aromatic and aliphatic solvents and fuels.
 
KK Silicone-Rubber
(
Silicone)
KK KK 180   Good resistance to salt solutions and water at 100°C, good resistance to weathering, ozone, minerals, animal and vegetable fats, alcohols and glycols. Good temperature resistance.
MQ Silicone-Rubber
(inside FDA)
(Silicone)
MQ MQ 180  

1) In this column, only general information on the elastomer group is possible. Individual consideration necessary. The light-coloured grades generally have poorer mechanical properties than the black elastomers. See General Tables of Resistance.

FDA: Part of sleeve in contact with medium acc FDA positive list.

black: inside of sleeve made of black rubber / white: inside of sleeve made of "white" rubber

E: These sleeves are available with conductive inside (R < 1.000.000 Ohm), additonal fee!

KTW: Leitlinie zur hygienischen Beurteilung von organischen Materialien im Kontakt mit Trinkwasser (Umweltbundesamt).

The abbreviations are acc. ISO 1629:1976 (E) and ASTM D-1418-79.

Chemical resistance of elastomers

The chemical resistance of elastomers can be estimated using general resistance tables, for example from Bürkle. See also "Chemical resistance of materials - General resistance tables".

The material of the inner side of the crimp sleeve is relevant in each case.

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