The FM Approved Model 834-60 Tubular Diaphragm Seawater Deluge Valve is a pressure operated, in-line axial valve. A tube diaphragm actuates the valve, which is comprised of three major components: 1) Tube 2) Barrier and 3) Body. There is only one moving part in the valve – the tube diaphragm. There are no shafts, packing, stem guides or springs.