The Twin Plate 4X7 Carbon Steel Abacus Check Valves are designed with a retainerless structure, eliminating any leak path to the atmosphere. These lightweight and compact valves are economical and easy to install, ensuring a tight shut-off with a resilient seat. The anti-slam feature prevents sudden closures, and they fully comply with API594 standards. Suitable for vertical pipes and compatible with all common flanges, these check valves offer reliable performance across various applications.