Standard and anti-static valves in ANSI class 150 and 300
Designed to Automate, Control, Contain
and Shut Off Your Process.
Worcester's Series 51/52 is a standardized line of flanged ball valves in sizes 1/2" -10" with flange ratings of ANSI Class 150 and 300. The combination of elements of this standardization provides a manually operated or automated valve which exceeds the production standards of your process. Such standards include high cycle operation, pressure tightness, material compatibility, speed of operation, automatic control and high temperature endurance.
Series 51/52 valves are 2-way flow ball valves designed to seal bi-directionally against resilient seats. The ball is forced downstream under pressure against the downstream seat to effect and maintain a seal. The resiliency of the seats is a result of design as well as the characteristics of materials used. Consequently, the valve will give bubble-tight shutoff throughout a long service life. The seats are also designed to perform a wiping action during each cycle. This wiping action cleans foreign materials off both the seat and ball and assures leak-tight sealing.
A pair of patented seats with relief slots makes downstream sealing possible. The result is less friction, lower operating torque, less seatwear, and longer service life. The patented seats also permit the valve to operate at a higher pressure differential with lower torques than double sealing valves in which there is sealing between both seats and the ball.
Downstream sealing prevents seat damage and lowers operating torque while providing fulrbi-directional capability. The Worcester design results in smoother, more efficient valve operation.
Leak Tight Stem Design
Worcester's Series 51/52 valves outperform globe and gate valves. Not only are they easier to automate, but best of all, they won't leak the way sliding stem valves often do. The no-leak rotary stem seal features a bottom entry, adjustable, self-compensating stem design. A hole in the ball's stem slot prevents any possibility of damage due to trapped cavity pressure when the ball is open. The stem seal package consists of one
or two thrustwashers and one or a series of stem seal rings, depending on valve size. On 1/2" -2" valves, a pair of Belleville washers acts as a spring to compensate for wear and thermal expansion. On larger valves, the deep stuffing box with additional packing pro- vides resiliency.
© Pneumatic Control, Inc. 1999/2000