Fluoroseal caged plug valves

Caged Control Valves

The caged control valve is ideal for abrasive applications with high concentrations of solids. The caged control valve is commonly used in both throttling and on/off applications. Caged valves have been used successfully in many critical applications in the Mining, Pulp & Paper, and Chemical Processing industries.

The design of the Caged Control valve provides maximum protection to the PTFE sealing surfaces in the plug valves. The key to the caged design is that the PTFE sleeve in the plug valve is never directly exposed to the process flow. This allows the sleeve to maintain its sealing integrity in abrasive applications.

The design of the caged control valve allows the plug to rotate freely around a fixed cage within the body. The cage stays stationary in the body while the plug rotates around the cage. Thus the sealing area of the plug is in direct contact with the sleeve to provide bubble tight shutoff. The cage stays in position protecting the PTFE sleeve from the flow while the plug is in any intermittent position such as when the valve is moving from the open to the closed position or when the valve is throttling.

The cage has upper and lower bearings made from either UHMWPE or RTFE that prevents galling between the plug and cage. A keyway keeps the cage from rotating in the body. The body has a male key and the cage has a female keyway that keeps the cage locked into the body. This allows free movement of the plug around the cage.

The caged control valve still allows for in line adjustment for through valve leakage just as a standard plug valve does since the plug and the cage are independent of each other.

Caged control valves can be used in many abrasive applications as well as applications with suspended solids. The cage and plug in the caged control valve are generally made from CD4MCu material; it’s an abrasion resistant alloy with the corrosion resistance of 316SS. Caged Control valves are available in any material, from carbon steel and stainless steel to any of the more exotic alloys.