mia malkova naked,vishnu priya xxx,ww bf sexy
The special grease is injected between the taper hole and the plug body from the top of the plug body to form an oil film to reduce the opening and closing torque of the valve and improve the sealing performance and service life of the valve. The working pressure can reach 64mpa, the max. working temperature can reach 325 ℃, and the max. diameter can reach 600mm.