- Chemical / Petrochemical
Greater valve wall thickness and proprietary coating on ball and seats combat corrosion in urea production.
Also known as carbamide, urea is a colorless, odorless, non-toxic solid organic compound that is highly soluble in water.
Essentually, it is the waste produced when the body metabolizes protein. In the manufacturing process, urea is produced from ammonia and carbon dioxide, and used for fertilizer-related products, usually in the form of granules, prills or crystals. Since it contains nitrogen, it is an effective feed additive that can aid animal growth.
In manufacturing, as urea is formed it coats metallic parts and needs to scraped or the valve's sealing effectiveness is compromised. Ammonia carbamate is also highly corrosive, and as temperature is increased for higher urea yields, there is potentially a higher risk of corrosion and leakage. Ammonia or ammonium carbamate leakage to atmosphere would cause serious environmental and safety problems.
MOGAS valve designs offer:
Typical Operating Conditions:
- forged body and end connections with greater wall thickness in critical areas
- sharper leaning edge on seat to scrape ball surface for repeatable tight isolation
- metal seats that wipe sealing surface of ball clean during operation
- greater sealing contact area
- dual-guided stem design and live-loaded packing to prevent stem packing leaks and risk of fugitive emissions
- application-specific coatings that provide enhanced erosion and corrosion resistance
- Temperature: 50 – 400° F (10 – 200° C)
- Pressure: 50 – 3000 psig (3.4 – 206.8 bar g)
- Sticky, hard urea product coating
- Extreme corrosion
- High-pressure steam
Urea Process Flow Diagram
- Low Pressure Liquid Ammonia
- Low Pressure Carbon Dioxide
- High Pressure Liquid Ammonia
- Carbon Dioxide Compressor
- Carbon Dioxide Cooler
- Urea Reactor
- Liquid Recycle Carbamate
- High Pressure Decomposer
- Low Pressure Decomposer
- Heat Exchanger (not shown)
- General Ball Valves (not shown)