The screw pump both type 2LB and new type 2GC have been widely used in the field of boats and ships,petoleum chemical industyr,metallurgy celeriac power,oil and foodstuff,etc.Both type 2LB and 2GC screw pump are horizontal rotary displacement pump of twin aspartic and twin-screw and non-sealing and having powerful self-absorbing cap city.Either type 2LBor 2GC can carry all kinds of oils,such as lubricating oil and fuel which contended micro partical,chemical liquid and light industry food and also can transport higher viscosity oil,such as residual oil,crade oil,etc.the temperayure of media cither.Type 2LB or 2GC transported is not above 80℃,for some special requirement the temperayure of transported media can be up to 180℃.The viscosity of transported media can be up to 10000 mm2/S.