The valve is attached loosely to the stem by ball and socket joint allowing slight play. The Valve proper is composed of three parts, the lower disk, A, and the upper one, B, embracing between ...

Founded in 1917, Parker and Harper Manufacturing was one of the first mass producers of ball valve components for many well known valve companies in the Worcester area during the infancy of the ...

This subcommittee will address control valves that directly transmit actuator linear motion to the closure components. This would normally include such styles as globe and cage valves. This ...