First of all, the one-piece ball valve is a manual valve. The structural design is integral, and the ball is stabilized by a plug, so that it is convenient for maintenance, and the diameter of the ball valve is also small. The ball is inserted from the side of the valve body. , After the valve seat has to be screwed in, press the ball again. Some non-standard one-piece ball valves have a short structure, so the best way to distinguish is the structure of the valve body.
The one-piece ball valve is fixed by a plug head, which is convenient and practical for maintenance, and is often used for small-sized valves.
The two-piece ball valve is called a stainless steel ball valve. It is composed of two left and right valve bodies connected by bolts. When fixing, the two valve bodies clamp the ball valve. The maintenance is relatively difficult. The most important thing is to look at the tightness of the screws in the middle. How, this is directly related to whether the seal is tight. In addition, it is mainly used in normal pressure and high pressure environments. Like non-standard valves with nominal diameters below DN50, they are also two-piece valves. The two-piece ball valve is fixed by two pieces of valve body sandwiching the sphere, and the maintenance is more complicated. The tightness of the middle screw is very important, and the relationship is whether there is air leakage. It is a commonly used valve.
The three-piece ball valve is similar to the two-piece ball valve, but the three-piece type can be used in ultra-high pressure environments, and the structure of the valve has three valve bodies, which are clamped and fixed by neck flanges on the left and right sides. Normal nominal name The diameter is above DN50. The three-piece ball valve is similar to the two-piece, but there are multiple valve bodies in the middle of the ball, which are clamped by flanges with necks on both sides. Larger and more important valves are commonly used.
