Supremo Line & Control manufactures Check Valve with Two Openings. Supremo Line & Control is an ISO 9001:2000 certified company. The Company also manufactures fluoropolymer PTFE, FEP, PFA lined SGI/WCB/SS/MS pipes, valve and fittings. This Check Valve is designed mechanically so that it allows a fluid to flow through it in only in one side direction.The Check Valve with Two Openings works automatically and is not controlled by a person or any external control method. One opening of this Check Valve for fluid to enter and other is for fluid to leave. This Check Valve has a specified cracking pressure.