Manual Valve คำถามที่พบบ่อย Q Can manual valves be installed in any directions? Q What is estimated life of bellows valve BSV series? QCan manual valves be installed in any directions? They can be installed both on horizontal and vertical pipes, but they should be installed upright to sideways and cannot be installed upside down. Manual valve mounting posture QWhat is estimated life of bellows valve BSV series? 5000 times for 15-100A and 2000 times for 125-200A.