Focused on the field of automotive transmission systems, Fast has been guided by technological innovation and continues to be specialized and strong. The products are sold at home and abroad and have become the typical representative of independent innovation and development of China's auto parts industry. The selection of “National Top 100 Excellent Auto Parts Suppliers†aims to accurately select industry elites and establish industry models. It is the only large-scale selection activity for auto parts OEM suppliers in China.
By-pass assembly has two positions; by-pass and close. It is in by-pass position during trip operation, and circulates mud fluid in the drill string into the annular space by-passing the idle motor, so that no mud may spray out onto the platform during the trip operation. When mud flow rate and pressure reach the setting value, the valve stem moves down and closes the valve. Meanwhile, mud stream flows through the motor, and converts the pressure energy into mechanical energy. As mud flow rate is too low, or mud pump stops, and as the pressure produced is not enough to overcome the spring force and the static friction force, the spring presses the stem upward, and by-pass is in open position. In general, the cross-over subs are used in deep well, large angle well, horizontal well or when hollow rotor is selected.
By-Pass Assembly And Parts,By-Pass Valve Assembly,Automatic Bypass Valve,Pressure Bypass Valve Weifang Shengde Petroleum Machinery Manufacturing Co., Ltd. , http://www.sdpetromachine.com
Fast launched in the 15th "National Top 100 Excellent Auto Parts Suppliers" list 
Fast has become one of the world's best-known auto parts suppliers with many excellent products. 
On November 27, 2018, it was learned that the 15th "National Top 100 Excellent Auto Parts Suppliers" list was announced, and Fast was awarded the title of "Excellent Transmission System Supplier". At this point, Fast has been awarded this honor for 15 consecutive years and has received high praise and attention from the industry.