EPR

Utilisation

The screw EPR pumps are designed for pumping of liquids in range from clear and thin waters, through viscous, polluted and thickened liquids and suspensions to pasty materials without abrasive effects. For its operating versatility and noted advantages these screw EPR pumps find utilisation almost in all industrial and manufacturing branches.

Technical description

The single-screw horizontal EPR pumps consist of hydraulic and mechanical parts. The hydraulic part is composed of a stator and a screw. The stator, which is put between the suction and the delivery housing, is provided with a vulcanised rubber insert piece with cavity in form of a double thread. Inside the stator there is a rotary steel screw in form of a single thread. The uniform tread motion creates closed and separated concave spaces which move according to the lead of its helix. In such way the delivered liquid is forced to move from the suction branch into the delivery branch. The mechanical part consists of bearing stand with driving shaft seated in two antifriction bearings lubricated with long-term grease charge. Against penetration of impurities or against grease leakage the bearing space is protected with rubber O-rings.

Material

GO - cast iron modification - basic modification for common neutral liquids consisting of following main parts:
- suction and delivery housing are made of grey cast iron, operating screw of stainless carbon steel, connecting propeller shaft of carbon steel and stator liner of special technical rubber.

GY - stainless modification for partly aggressive liquids and substances consisting of following main parts:
- suction and delivery housing, operating screw and connecting propeller shaft are made of stainless steel, stator liner is usually made of special technical rubber or of special rubber used in food industry.

Stuffing box

The stuffing box of the driving shaft is provided with a soft packing cord and a flooded ring.

Technical parameters

Max. temperature of delivered liquid: 70°C
Flow rate: Q = 0,15 - 13 l/sec
Max. delivery pressure: 0,6 MPa