PTMS Exporters and Consultants Pvt. Ltd. MK Type Flexible Metal Membrane Plate Couplings. PTMS Exporters And Consultants Pvt. Ltd. Is an ISO9001:2000 certified company. The other products manufactured are High Pressure Centrifugal Pumps, Triplex Plunger Pumps, High Pressure Valves etc. MK Type Flexible Metal Membrane Plate Couplings are recommended as principal for standard application conditions. The MK Type Flexible Metal Membrane Plate Couplings has continuation of torque transfer even after breaking of flexible metal membrane for any reason. MK Type Flexible Metal Membrane Plate Couplings have "cartridge" construction. Features of MK Type Flexible Metal Membrane Plate Couplings include a dynamically balanced construction, a long operating life, and tolerance to high and low operating temperatures.