Threaded SwingCheck Valves are available in ductile iron or carbon steel and provide the oil patch with a dependable, trouble free, quality check valve. All of our Threaded Swing Check valves conform to NACE MR0175 requirements to meet your corrosive service needs. Down-time and maintenance are reduced. Our clapper and seat design are beveled and self-aligned to ensure zero leakage. The molded clapper seal design insures a seal at 1 (one) psi differential. All valves are full opening through conduit design to ensure a very low pressure drop. They are in-line, in-fi eld repairable. Our Check Valves are of the highest quality available at very competitive prices. Threaded Swing Check Valves come in 1/2