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

Materials for rubber parts of Subtor progressive cavity pumps

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

 

Materials for the stator of Subtor progressive cavity pumps

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.