The Crane Dual Plate Check Valve allows both plates to close at the same time for quick response, and excellent dynamic performance. Dual-plate designs that are compact and lightweight for efficient seating, operation and lower installation cost Independent springs with long legs to prevent seat scrubbing and provide non-slam performance Retainerless valve design without body penetration for critical service. It allows flow in one direction only, and close automatically if flow reverses. Crane Dual Plate Check Valve is very effective. The dual plate check valve is an important safety device for preventing backflow in water systems.