SJMC is most professional manufacturer of all kinds of engine rebuilding machine in China, especially valve seats boring machine sale more than 100 untis year all ove the world. it has following feature: Advantages and features of BV series valve seat boring machine comparing with the competitors: 1. Dual locking structure between the spindle box and the beam of all models of BV series valve seat boring machine : vacuum tight and cylinder pressing, in order to ensure the firm locking and absolute standstill of the spindle box after centering. 2. BV series valve seat boring machine adopts imported pneumatic components and famous electric components, complying with international standards. 3. BV60 adopts 1.2kW spindle motor , 50 ~ 600 rpm to ensure a constant torque of 18 N.M and the easy boring for larger valve holes of 55~ 70mm at low speed; at high speed of 600 ~ 1000 rpm, constant power and high efficiency, the boring can make the perfect smoothness. The standard configuration includes the NEWEN Type tools holder , tip holder and tips imported. 4. BV90 adopts 1.8kW spindle motor , 50~350 rpm to ensure the constant larger torque of 25 N.M and the easy handling of 80 mm large hole; at high rotation speed and constant power, the boring can make the perfect smoothness. Featuring the large power, large torque motor, wide and stable bed structure, and light and flexible air floating structure, the machine tool is applicable to almost all kinds of cylinder heads. The standard configuration includes the NEWEN Type tools holder , tip holder and tips imported. 5. BV120 adopts 2.5 kW spindle motor, the spindle in diameter of Φ90 mm for heavy cutting and a heavy duty machine bed of special reinforcement, featuring maximum torque of 42N.M. and special stable and powerful boring at low speed within 50 rpm, so that it is applicable for processing heavy duty diesel engine cylinder head and high hardness valve seat. The standard configuration includes the NEWEN Type tools holder , tip holder and tips imported. 6. BV60S is a light valve seat boring machine, and it features a very high cost performance, so that helps you to withdraw your investment in a shorter period of time. Such compact and lightweight machine, is still constructed in the 3D air floating structure, and can centering quickly, therefore, it is applicable for the small factory with limited space, especially for the small engine cylinder head with new energy hybrid power, and most of the small and medium-sized gasoline engine cylinder head.