Shanghai jumping portal co. Ltd. Is a production ship ballast water valve, ship-washing tower valve, boat-desulphurization tower valve, boat-based stainless steel, aluminium alloy, double steel, casting steel, copper, cast iron valve, product-based butterfly valve, boat-cut valve, ship-end valves, boat-based ball-valve filters, ship-based safety valves, ship-based pressure-relief valves, and can provide class ics, abs, dnv, gl, lr nk, bv, rine, kr, etc