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Edlon-3P Plastic Lined Pipe

Simtech

Micromold Solid Plastic

Hastelloy

Titanium

Alloy 20

Tantalum

 

VALVES

Durco Plastic Lined Valves

Inline Industries Steel Ball Valves

Tricentic High Perf. Butterfly Valves

Frisch Damper Valves

Prisemasson Sample Valves

Crane Duo-Chek II Check Valves

 

ACTUATORS

RCS/Dresser Electric Actuators

Automax Pneumatic Actuators

 

EXPANSION JOINTS/HOSE

Edlon-3P Lined Hose

Mercer Rubber Expansion Joints

 

FIBERGLASS

Fibergrate Molded, Pultruded, Structural

Edwards Fiberglass Tanks

 

PUMPS

Wanner PVDF/PTFE Solid Plastic

 

STEAM TRAPS

Nicholson Steam Traps

 

LEVEL GAGES/SIGHT FLOW

Jogler, Inc.

 

TEFLON SHEET LININGS & COATINGS

Edlon-3P

 

ACID SAFETY SPRAY SHIELDS

Advance Products & Systems, Inc.

 

PLASTIC STORAGE TANKS

Chem-Tainer

 

 

 


 


 

Evolution of the Butterfly Valve Seal

 

 

Resilient Seal

Original butterfly valve had shaft penetration through the seal plane.  Dowel pin through disc and shaft often leaked.  Note the interference between the seal and the disc which is needed to effect a tight seal.  This will wear with use and eventually leak.

 

 

High Performance Seal

The next step in butterfly valve evolution was to move the shaft from the seal plane.  Dowel pin parallel to disc does not leak.  Note that this design also relies upon interference for sealing and will also eventually leak.

 

 

 

TRICENTRIC® Metal Seal

The triple eccentricity with the metal seal is the final step in the evolution.  Square keys are utilized for torque transmission.  Since there is no interference between mating parts during closure, seal wear is eliminated and the seal actually becomes tighter with use.  Tight shut-off up to 1200°F.

 

Previous Page - Tricentric® Seal


 

 

 

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Phone (800)536-0043 or (636) 443-1200
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