Progressive Cavity Pump Rotor and Stator Selection
Shape Selection of the Stator and Rotor
Type A
Short pitch, single head
Thread number of stator and rotor: 1/2
Standard design, stable function, common pump
Type B
Long pitch, single thread
Thread number of stator and rotor: 1/2
Suitable for low pressure and big flow
Type D
Short pitch, double thread
Thread number of stator and rotor: 2/3
Suitable for the converying of corrosive media
Type P
Long pitch, double head
Thread number of stator and rotor: 2/3
Suitable for transmission of corrosive substances, low pressure and large flow
Material | Corrosion resistance | Swelling resistance | Abrasion resistance | High temperature resistance | Temperature range | Application |
NBR | Satisfactory | Good | Satisfactory | Satisfactory | +110℃ | Petroleum, sewage, food, beverage, chemical, papermaking |
NBRH | Good | Excellent | Good | Satisfactory | +120℃ | Petroleum, refining and chemical, chemical, sewage |
EPDM | Good | Poor | Good | Satisfactory | +120℃ | Chemical, chemical agent, papermaking |
FKM | Excellent | Excellent | Poor | Excellent | +180℃ | High temperature and corrosive medium |
HNBR | Excellent | Good | Good | Excellent | +170℃ | Petroleum, petrochemical, chemical |
PTFE | Excellent | Excellent | Poor | Excellent | +230℃ | Corrosive medium(acid, alkali and etc), food and beverage industry |
Common metal materials | Corrosion resistance | Abrasion resistance | Cl-resistance(ppm) | Suitable medium |
CRS alloy steel | Common | Common | No resistance | Abrasive mediums without corrosiveness |
CRS alloy steel with hardening treatment | Common | Excellent | No resistance | Abrasive mediums without corrosiveness |
SS420 stainless steel with hardening treatment | Satisfactory | Good | No resistance | Abrasive mediums with light corrosivness |
SS304 stainless steel | Good | Satisfactory | < 100 | Applied in food production, acidic mediums without abrasiveness |
SS304 stainless steel with hardening treatment | Good | Good | < 100 | Non food applications, corrosive and abrasive mediums |
SS316 | Good | Satisfactory | 100~2000 | Applied in food industry, acidic mediums with no abrasivness |
SS316 stainless steel with hardening treatment | Excellent | Excellent | 100~2000 | Non food applications, corrosive and abrasive mediums |
Duplex SS stainless steel | Excellent | Excellent | 1000~40000 | Corrosive mediums with high Cl- but no abrasiveness |
Duplex SS stainless steel with hardening treatment | Excellent | Excellent | 1000~40000 | Corrosive medium with high Cl- and abrasiveness |
Note: For all the stators and rotors above, you can choose their type according to your necessary conditions or requirements. Contact us for more details.
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