Forged Steel Stainless Steel Disc Swing Wafer Ball Lift Industrial Check Valve. Versatile Media Compatibility: Suitable for water, oil, gas, and various industrial media applications. Flexible Installation Options: Can be installed horizontally or vertically with flexible positioning. Self-Locking Safety Feature: Valve self-locks when closed and will not open due to pipe pressure. Durable Low-Torque Operation: Requires small torque for opening/closing, allowing frequent use without damage. Comprehensive Quality Control: Pre-production samples and final inspections ensure strict quality standards. ISO 9001 Certified Manufacturing: Factories certified to international ISO-9001 quality system standards. Multiple Customization Options: Offers customization from samples, designs, and minor adjustments. Global Shipping and Payment: Accepts multiple currencies and payment types including T/T, L/C, and PayPal.