Ladish MEGA Metal Seated Ball Valve

One of five 12″ CF8M Metal Seated Ball Valves w/ AIT Gears

Dirty, Erosive and / or Mild Corrosive Service to 850F
Graphite Energized Seats with Seat and Ball Coating based on Service Conditions. Class 150, 300 and 600
Applications Include Ethylene, VCM, Catalyst / Powder Feed, Furnace Transfer Lines
Generally Manual Valves or infrequent on/off where contaminants can “lock” more Severe Service Valves

“Clean” Service, 450F to 1000F
Strong Acids and Oxidizers where Coatings of Metal Seated Valves will not Function (e.g. HF, Chlorine)
50% Torque Requirement vs. Metal Seated
P/T Rating to ASME B16.34 Valve Body. Generally Class 300 and 600.

12″ CF8M Metal Seated Ball Valves

Assembling

Testing


GRAPHITE SEATED	METAL SEATED
Class 300 and 600	Class 150 – 600
Flanged Ends	SW/BW, RFF, RTJ End Connection Possible
¾” – 8”	.5” – 14”
Split Body or Unibody, Full or Reduced Port	Split Body or Unibody, Full or Reduced Port
Target Market: SPECIALTY CHEMICALS. Clean High Temperature and Acid Service with Temperatures above 450F (up to 1000F)	Target Market: Petrochemical and Chemical •High Temperature •Solids Handling •ETHYLENE and VCM •Alloy Options include 316SS, Monel, Inconel, etc.
API 598 Shutoff	API 598 Shutoff (HP Test Included)
Full Alloy Options (Hastelloy, Inconel, Incoloy, Monel, etc.)

Base Metal Contact (Gate and Globe Valves – Not Sliding Wear)
Coated or Modified Metal (Most Common)
Stellite Weld Overlay (Usually Stellite VI – Cobalt Based)
“Surface Modification” of Sealing Surfaces: Ex. Nitriding, Boronizing, etc.
Plating: Ex. Chromium Plating or ENP (Electroless Nickel Plating)
HVOF Coating: Tungsten and Chromium Carbide are the most common
Fused or Vacuum Deposition of “Coating” typically Tungsten Carbide
There is no “One size fits all” for “Metal-to-metal” sealing. Coatings are very application dependent.

Chrome Carbide, Tungsten Carbide, Chrome Oxide and other specially formulated coatings.
- Cr3C2-NiCr
- WC-Co / WC-Ni / WC-Co-Cr / WC-CrC-Ni
Coating mechanically bonds to the Substrate Material.
Mechanical bond – >12,000 psi bond strength for Carbides, 5,000 – 7,000 psi for Chrome Oxide Ceramic.
Robotically positioned spray gun creates high kinetic energy allowing the coatings to be applied in a compressive state.
Problems:
- Porosity – Poor Sealing on Gas
- Carbon Content makes these coatings vulnerable to Oxidation.

Ladish Valve Coating Technology

Substrate material becomes annealed due to fusing temperatures; subsequent heat treatment required.
Semi-molten coating “sags” or “sloughs” – gravity effect
Coated Surface is “finish” machined using either CBN (cubic boron nitride) or PCD (polycrystalline diamond) tooling.
Very Low Porosity – Best for small molecule gas and particles smaller than 1 micron.

VCM (Vinyl Chloride Monomer) – Stainless, Monel and Inconel Valves for Acid from Chlorine. Nickel Alloys becoming more Prevalent at 600+ F
Ethanol/Methanol – Stainless Steel for Acid Attack
Propylene / Ethylene Oxide / PDH – Reactive Chemicals require High Alloy valves with little Corrosion. Oxygen Service Valves are common and use Stainless and Hastelloy
Polyethylene / Polypropylene Production – Business is in Additive Handling and Ball Valves. Hastelloy and Stainless Steel are used so that Iron (from Carbon Steel) does not contaminate the process.
Phenol, Cumene, Butadiene – These are Reactive Chemicals requiring Nickel Alloys due to ORGANIC Acids.
Ammonia / Nitric Acid – Stainless (304) and Monel to Resist Attack
Ethylene: Pyrolysis Oils and Start-Up Vent Valves