TYPES OF VALVES
Figure 12 Typical Ball Valve
A ball valve is generally the least expensive of any valve configuration and has low
maintenance costs. In addition to quick, quarter turn on-off operation, ball valves are
compact, require no lubrication, and give tight sealing with low torque.
Conventional ball valves have relatively poor throttling characteristics. In a throttling
position, the partially exposed seat rapidly erodes because of the impingement of high