The invention provides a high-pressure internal thread
ball valve. The high-pressure internal thread
ball valve comprises a valve body, a valve cap, a valve rod, a valve ball and a pressing cap, and is characterized in that the valve body, the valve cap, the valve rod, the valve ball and the pressing cap are made from the same main material, wherein the main material comprises, by
mass, 7-9% of Zn, 1-3% of Pb, 2-4% of Si, 0.12 -0.15% of Ti, 0.1-0.3% of Fe, 0.1-0.3% of Al, 0.15-0.19% of C, 0.05-0.07% of B, 1.0-2.0% of Cr, 0.01-0.03% of Sb, 0.25-0.28% of Mn, 0.05-0.07% of Nb, 0.01-0.03% of V, 0.001-0.002% of Bi, 0.003-0.005% of S, 0.005-0.006% of P, 0.01-0.02% of
rare earth elements, and the balance Cu and inevitable impurities, and the sum of the components is 100%. A
machining process of the high-pressure internal thread
ball valve is simple and easy to implement, and low in cost, and the machined ball valve has good high-
temperature resistance and
corrosion resistance performance, andis long in service life.