The independent ring heating cavity is able to conduct full heating without causing deformation of relevant part. It is good for meeting the requirements of transmitting high temperature medium and special medium. Material of the part being in contact with the medium and that of the heating casing can be different and this greatly reduces the cost of production. Owing to the separate structure of the insert and pump casing, it is not required to move the pump out of the pipeline for repairing or replacing the insert, which makes maintenance and repair easy and at a low cost. The cast insert can be made of various materials so as to meet the need of different medium. The replaceable insert can also resist slight deformation due to factor of heating and compressed air. Twin screw pump with external bearing: It includes packing seal, single mechanical seal, double mechanical seal and metal bellows mechanical seal, etc. The twin screw pump with internal bearing normally adopts single mechanical seal, for delivery lubrication medium. The pump with external bearing may realize independent lubrication of its bearing and the timing gear. The pump with internal bearing may achieve lubrication of its bearing and the timing gear with pumping medium. The W, V twin screw pump with external bearing manufactured by our company has adopted the imported heavy duty bearing, ensuring reliable operation and long service life of the product.* Handling various medium without solid. * viscosity 1-1500mm2 /s the viscosity can reach up to 3X10⁶ mm 2 /s when reduced the speed. * Pressure range 6.0MPa * Capacity range 1-2000m3 /h * Temperature range -15 -28 *Application: * Ship building used for marine as cargo and stripping pump, ballast pump, lubricating oil pump for main machine, fuel oil transfer and spray pump, load or unload oil pump. * Power plant heavy and crude oil transfer pump, heavy oil burning pump. * Chemical industry transfer for various acid, alkali solution, resin, color, printing ink, paint glycerin and paraffin wax. * Oil refinery transfer for various heating oil, asphalt oil, tar, emulsion, asphalt, and also loading and unloading various oil goods for oil tanker and oil pool. * Food industry used for brewery, food products factory, sugar refinery, tin factory to transfer for alcohol, honey, sugar juice, toothpaste, milk, cream, soy sauce, vegetable oil, animal oil and wine. * Oil field transfer for various oil goods and crude oil and etc.