A, the type of water valve
Valve is the control part in the fluid conveying system, which has the functions of cutting off, regulating, shunting, backflow prevention, pressure stabilization, shunting or overflow pressure relief.
The valves used in the fluid control system, from the simplest cut-off valve to various valves used in the extremely complicated automatic control system, have quite a variety of varieties and specifications. Valves can be used to control the flow of various fluids, such as air, water, steam, corrosive media, mud, oil, liquid metal and radioactive media. Valves are divided into cast iron valves, cast steel valves and stainless steel valves (20 1, 304, 3 16, etc. ), Cr-Mo steel valves, Cr-Mo-V steel valves, dual-phase steel valves, plastic valves, non-standard customized valves and other valve materials.
(1), gate valve
1. Gate valve is also called gate valve. This is a widely used valve. Its closing principle is that the sealing surface of the gate and the sealing surface of the valve seat are highly smooth, flat and consistent. Cooperate with each other to prevent the medium from flowing through? And depends on the shape of the top die, spring or ram. So as to enhance the sealing effect. It mainly plays a cutting role in pipelines.
2. What are its advantages? :? Small fluid resistance, energy-saving opening and closing. It can be used in the case of bidirectional flow of media. No direction,? When fully opened, the sealing surface is not easy to be corroded. The structural length is short. It is not only suitable for making small valves, but also suitable for making large valves.
3. Gate valves are divided into two categories according to the thread of the valve stem. One is the open stem type. ,? The second is the hidden rod type.
4 according to the ram structure, Also divided into two categories? ,? One is parallel? ,? The second is the mode.
(2), stop valve
1, stop valve,? Also called door cutting? This is the most widely used valve. Why is it so popular? Is it because the friction between sealing surfaces is small when opening and closing? More durable,? The opening height is not large. Easy to manufacture and convenient to maintain, not only suitable for medium and low pressure, but also suitable for high pressure.
2. What is its closing principle? Rely on the pressure of the valve stem. So that the sealing surface of the disc and the sealing surface of the valve seat are closely attached. Stop the media circulation.
3. The cut-off valve only allows the medium to flow in one direction. Orientation during installation. Its structural length is longer than that of gate valve. At the same time, the fluid resistance is high. Long-term operation? The sealing reliability is not strong.
4, cut-off valve is divided into three categories? :? Straight-through, right-angle and DC oblique globe valves.
(3), butterfly valve
1. Butterfly valve is also called butterfly valve. As the name implies,? Its key component is like a butterfly facing the wind. Free rotation
2. The disc of butterfly valve is a disc. Rotate around the shaft in the valve seat. The rotation angle is the opening and closing degree of the valve.
3. Is the butterfly valve light in weight? ,? It saves material than other valves. Simple structure and quick opening and closing. Cut-off and throttling can be used. Small fluid resistance and labor-saving operation. Butterfly valve? It can be made into large caliber. Where can butterfly valves be used? It is best not to make a gate valve. Because butterfly valves are more economical than gate valves. And has good adjustability. At present,? Butterfly valves are widely used in hot water pipelines.
The above is mainly about the detailed information about the types of water valves, including the overall classification and introduction, as well as the detailed introduction of three more common products. From this, we can learn a lot of valuable plate contents and have a relatively more detailed and professional impression on the types of water valves. In the purchase process, you can refer to the requirements of the use environment for product parameters, and start learning with the advice of professionals to screen out suitable and reasonable solutions.