Profile: Ningjin Huamei Machinery Co., Ltd. is a manufacturer of double offset butterfly valves. Our valves are available in soft seat, metal seat and fire-safe seat designs. Our soft seat (PTFE/RTFE) butterfly valves provide a bi-directional bubble-tight shutoff (zero leakage) by the use of a patented seat. This unique seat design creates a self-energized seal in vacuum to-low pressure applications. This soft seat butterfly valves are designed for services with minimal wear and low torque.