Model 521 - Single Poppet Safety Valve

Features -
✔ A 100% seal
✔ Unobstructed flow
✔ The poppet and seat are completely independent of the top shear section, so even with the top off, the valve assures a 100% liquid tight seal
✔ The single-link design provides ease of operation and reduced maintenance
✔ A stainless steel reset nut eliminates stripping the fusible link during valve reset, reducing downtime by allowing manual reset even under pressure
✔ All Universal Safety Valves are protected by zinc plating, assuring maximum corrosion resistance, unlike competitive products that are only painted
✔ An air test port allows line testing without breaking the integrity of the line
✔ Raised bosses provide secure anchoring

Construction -
• Zinc-plated cast iron body and top
• Stainless steel spring and shaft
• Bun-N seal