CHEM-PLUG® SLEEVED VALVES
Chem-Plug® sleeved valves are available in two basic designs; diaphragm top-seal models and V-ring top-seal models. Both types are further divided into 300lb. ANSI screwed end models and 150 and 300 lb. ANSI flanged end models. With special modifications, the V-ring top-seal models can be used for severe service applications such as gaseous or liquid chlorine service.

All Chem-Plug® sleeved valves are available in a comprehensive choice to body, plug, and sleeve materials to suit almost any service where a plug valve is required.

(See page 11 for complete materials and ordering codes)

The solid PTFE sleeve is compression molded and then sintered to provide optimum density which minimizes chemical permeation. This process assures that the sleeve will not deform during thermal cycling within the temperature limits of PTFE.

Raised sealing rings are cast 360° around the ports for positive sealing under pressure, vacuum, and temperature cycling.

Blow-out lips are cast adjacent to the port openings to prevent sleeve rotation and reduce sleeve cold flow.

To prevent the buildup of a static electrical charge on the plug, a grounding spring is standard.

All Chem-Plug® sleeved valves feature adjustable plugs to compensate for normal wear and the resultant internal leakage.

Sleeved Chem-Plug® valves are available in multi-port configurations which are described in more detail in this brochure and in the accompanying Engineering Submittal Data Sheets.

All of the flanged Chem-Plug® sleeved valves conform to ANSI B16.34 and the Face to Face requirements of API 6D (short pattern), API 603, and ANSI B16.10

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DIAPHRAGM TOP SEAL MODELS
Due to a unique hot forming process, the self-energized PFA diaphragm top seal provides positive stem sealing and a long service life. The rolled lip (see inset) around the stem, backed up by the thrust disc, means the sealing force exerted against the stem increases with the increase of line pressure inside the valve.

The diaphragm has enough flexibility to compensate for any plug adjustments which may be necessary during the life of the valve. The stainless steel backup diaphragm provides additional support to the PFA diaphragm for longer and more reliable service life at elevated temperatures.

Diaphragm top sealed Chem-Plug® valves are serviceable in the field. Special tools for replacing the diaphragm should be used so that the sealing surfaces are not damaged during the installation. Consult our factory for the availability of these tools.

V-RING TOP SEAL MODELS

For those applications where positive stem seal adjustment is required, Chem-Plug ® sleeved valves are available with V-ring top seals. These valves have a true stuffing box for top seal packing and gland adjustment to reduce leakage of hazardous substances by the stem to virtually zero.

Chem-Plug ® sleeved valves with V-ring top seal can be adjusted to compensate for normal wear.

Like all Chem-Plug ® valves, the plug can be adjusted separately from the top seal so that the packing does not have to be re-adjusted.

Packing can be serviced or replaced without removing the valve from the pipeline.

V-ring packing supplied by the factory is selected to be compatible with the temperature limits of the sleeve. Sleeves and packing for higher than standard temperatures can be supplied as an option.

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