Piston Piston Check Valve Type class 800. Piston type NPT thread ends - 2234N | Genebre Piston Check Valve Type class 800. Piston type NPT thread ends - 2234N | Genebre The Piston Check Valve Type Class 800 by Genebre, model 2234N, is a high-performance valve designed for industrial applications. It features a piston-type mechanism that ensures reliable flow control and prevents backflow. The valve is equipped with NPT (National Pipe Thread) thread ends, facilitating easy installation and secure connections. Its robust... View NPT PN 140 DIN ASTM A105N Stellite