Devlon® Devlon® is among the toughest and hardest wearing thermoplastic available. It was designed for the valve industry as a seat material to provide a wide temperature and pressure range. Markez® is a high performance perfluoroelastomer compound that offers a broad chemical and temperature resistance up to 600°F.
What material is used in valves?
| Base material | Valve body | Ball |
| Bronze / Brass | Bronze (CAC401) Brass (C3771) | Brass Stainless steel |
| Cast iron | Gray cast iron (FC200) | Stainless steel |
| Ductile iron | Ductile iron castings (FCD-S) | Stainless steel |
| Cast steel | Carbon steel castings for high temperature / pressure service (SCPH 2) | Stainless steel |
How do you choose a valve class?
The right valve choice means matching the valve’s size to expected flow through the system. Know the chemical compatibility requirements. The valve materials need to be compatible with the gases or liquids flowing through it. Plastic valves usually resist harsh or corrosive chemicals better than metal valves.
What are valve seats made of?
Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position, and then machining a conical-section surface into the valve seat that will mate with a corresponding …
What are PTFE seats?
PTFE (P) Made from Virgin Teflon, this is the most common sealing material; its chemical compatibility is excellent for almost all media. Temperature -50°F to 400°F. PTFE Cavity filled Seats Available on request (CF), suitable for filling the void between the body and ball eliminating product build up.
Is devlon a nylon?
Devlon A153 is a specially formulated high viscosity Nylon 66, giving superior wear characteristics, improved strength and rigidity, providing greater design reliability when strength, weight and size are crucial.
What should I look for when selecting a valve seat?
When selecting seats, always consult the pressure / temperature charts and corrosion resistant guide or contact the factory for engineering help. Not all seats are available for use in all our valves. Made from Virgin Teflon, this is the most common sealing material; its chemical compatibility is excellent for almost all media.
Where can I find a chemical compatibility chart for valve materials?
CHEMICAL COMPATIBILITY GUIDE Attached you will find 2 charts: 1 from Nibco® and 1 from FMC Technologies® Also go to our website for the best valve materials chemical compatibility chart: – These “Chemical Compatibility Charts” are indicative only.
Do all butterfly valves have the same ASTM rating?
The body of a properly functioning butterfl y valve is isolated from the chemicals being handled and need not carry the same rating. THERMOPLASTICS & ELASTOMERS ABS— Acrylonitrile Butadiene Styrene Class 32222 conform- ing to ASTM D3965 is a time-proven material.
Why is the valve body rated as the least resistant part?
The rating assigned to the valve body plus trim combinations is always that of the least resistant part. In the cases where the valve body is the least resistant, there may be conditions under which the rate of corrosion is slow enough and the mass of the body large enough to be usable for a period of time.
