Cavity Filled Valves
Worcester ball valves with total enclosure seats.


Valves For Stick-Free Operation on Rubber Polymers, Monomers, Styrene, Butadiene, Slurries.

Free Valve Sizing


Worcester Controls offers the quality solution to sticking valve problems, cavity filled ball valves. Some of the roughest process control problems involve those in butadiene and styrene services. These and other fluids such as rubber polymers can polymerize in place. That means they can polymerize inside valve body cavities effectively immobilizing the valves.

In applications where product can polymerize FEP seats are available to reduce "popcorning" which can occur in TFE or Reinforced TFE seats.

A unique seat design using TFE, Polyfill or FEP eliminates most of the volume between the ball, stem and body. This reduces area for product build up associated with conventional ball valves.

Worcester cavity-filled valves offer excellent performances in control of pharmaceuticals, food products, sticky and viscous fluids and slurries. They are available in Worcester's Series 44 3-piece (sizes 1/4" - 2"), Series 59 3- piece full port (sizes 1/4" - 1 1/2"), Series 51/52 flanged (sizes 3"-8") and Series 82/83 flanged full port valves (sizes 2"-6"). Diverter body cavity filler valves are available in sizes 1/2" - 2". 

Cavity-filled valves may be completely automated with Worcester's Series 39 pneumatic or 75 electric actuators. Both actuators can be optionally equipped with process monitoring equipment and/or positioners for modulating applications. Special automation packages available for PLC/computer controlled systems.

Worcester offers a fire-rated version of the cavity-filled valve. FEP seats are qualified per API 607. Grafoil stem seals and body seals (suitable for butadiene processes) are used on fire-rated valves.


Pneumatic Control, Inc. 1999/2000