Forged steel ball valve is cast into the valve, generally casting the valve pressure class are relatively low (such as PN16, PN25, PN40, but there are high pressure, can be 1500 lb, 2500 lb) , most of the diameter DN50.
Forging valve is forged out, usually used in the high-grade pipe, smaller diameter, generally in DN50 below. Cast steel ball valve open and close parts (ball) driven by the stem, and around the stem axis for rotation of the valve. Mainly used to cut off or put through the medium in the pipeline, can also be used for fluid regulation and control, which is hard-sealed v-ball valve. The v-shaped core has a strong shear force between the v-shaped core and the hardfacing metal seat of the cemented carbide, which is especially suitable for the medium containing fibers, small solid particles and so on. Ball valve is generally divided into handle ball valve, pneumatic ball valve, electric ball valve, cast iron ball valve, stainless steel ball valve, copper ball valve and so on.
Ball valve is by rotating the valve love to make the valve open or closed. Ball valve switch light, small size, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and spherical surface often in a closed state, not easy to be medium erosion, has been widely used in various industries.
The difference between forged and cast steel ball valves:
1. Product standards: general purpose valve flanges and butt welding steel ball valves GB/T12237 -89; iron and copper ball valves GB/T15185 -1994; general requirements for steel valves GB/T12224 -2005; 《 safety evaluation standard for drinking water conveyance and distribution equipment and protective materials 》 GB/T17219 -1998
2. Engineering standard GB50242-2002; code for acceptance of construction quality of ventilation and air conditioning engineering GB50243-2002
Cast steel ball valve funcation:
1. The fluid resistance is small and its resistance coefficient is equal to the length of the pipe.
2. Simple structure, small size and light weight.
3. Tight and reliable, ball valve sealing surface materials widely used plastic, sealing good, in the vacuum system has been widely used.
4. Easy to operate, open and close quickly, from full open to full closed as long as the rotation of 90 degrees, easy to control the distance.
5. Maintenance is convenient, the ball valve structure is simple, the sealing ring is generally movable, disassembly and replacement are more convenient.
6. In full open or full closed, the ball and seat of the sealing surface and media isolation, media through, will not cause the valve sealing surface erosion.
7. It can be used in a wide range from small to a few millimeters, large to a few meters, from high vacuum to high pressure.
Ball valve has been widely used in petroleum, chemical, power generation, paper, Atomic Energy, aviation, rocket and other departments, as well as people’s daily life.
