Linc 4000-211 400 Series Two-Way No Freeze Valve, 1" NPT, WP 700 PSI

The Linc 4000-211 is a robust two-way no-freeze dump valve designed for reliable liquid level control in oil and gas production environments, particularly in cold climates where freezing is a concern. Manufactured by Linc Manufacturing in Porter, Texas, this valve features a pilot-operated design that prevents freezing by allowing continuous low-volume bleed, ensuring operational integrity in separators, treaters, and scrubbers. Key benefits include high durability in harsh conditions, ease of maintenance with a simple trim replacement, and compatibility with pneumatic level controllers for automated dumping. It offers advantages over standard dump valves by minimizing downtime due to ice formation, with a working pressure up to 700 PSI suitable for mid-range applications. Drawbacks may include the need for periodic bleeding which could lead to minor gas loss, and it's best suited for gas-blanketed systems. Applications span natural gas processing, oilfield production, and chemical handling where precise level control is critical. This model includes a 1" NPT process connection and 1/2" trim size, providing efficient flow rates for medium-duty operations. Compared to similar products like Kimray or Fisher valves, the Linc 4000 series emphasizes no-freeze reliability at a competitive cost, though it may require custom adaptations for high-pressure extremes.