Swing Check valves are sometimes referred to as non-return, clack, retention, reflux or one way valves. All Check valves are self-activating valves, designed to prevent back flow and are used in most cases to protect equipment, for instance pumps, product and people. D&D International Valves Ltd stock swing check valves manufactured by TT Valves UK Ltd. and Weflo valves. Our Cast steel range of swing check valves includes Class 150, 300 and 600 rating, flanged suitable for corresponding flanges. The TT Valves UK Ltd. Check valves can be modified to include outside lever and weight to assist closure of the check valve. The Weflo Cast Iron swing check valves are available from stock, flanged PN16 and ANSI 125. D&D International valves Ltd. can source wafer pattern check valves as required to meet your project requirements. Please contact us today with your valve sourcing needs.