Summary of all kinds of general valves and special valves
Release time:
2019-06-13
Author:
Source:
Ball valve, the opening and closing parts (ball) are driven by the valve stem and rotate around the axis of the ball valve.
1. Ball valve
Ball valve, the opening and closing parts (ball) are driven by the valve stem and rotate around the axis of the ball valve.
Features:
1. Wear-resistant: Because the spool of the hard-sealed ball valve is spray-welded by alloy steel, and the sealing ring is welded by alloy steel, the hard-sealed ball valve will not produce too much wear when it is switched and closed. (It has a hardness coefficient of 65-70):
2. Good sealing performance: because the sealing of the hard seal ball valve is manually grinded, it can only be used until the valve core is completely consistent with the sealing ring. So his sealing performance is reliable.
3. Light switch: Because the bottom of the sealing ring of the hard sealed ball valve uses a spring to hold the sealing ring and the valve core tightly, the switch is very light when the external force exceeds the preload of the spring.
4. Long service life: It has been widely used in petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rockets and other departments, as well as in people's daily life.
Pros:
Pros:
1. The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length.
2. Simple structure, small size and light weight.
3. It is tight and reliable, and the sealing surface material of the ball valve is widely made of plastic, with good sealing, and has been widely used in the vacuum system.
4. Easy to operate, fast opening and closing, from full open to full closed, as long as the rotation is 90°, which is convenient for long-distance control.
5. It is easy to maintain, the structure of the ball valve is simple, the sealing ring is generally movable, and it is more convenient to disassemble and replace.
6. Wide range of application, from a small diameter to a few millimeters, as large as several meters, high vacuum or high pressure can be applied.
Second, the gate valve
(1) Open rod gate valve: rotate the handwheel, through the thread of the handwheel and the valve stem, lift or lower the valve plate connected with the valve stem, and achieve the effect of opening and closing.
Key words:
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