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The characteristics and differences of various electric valves

by:Sino Valves     2021-02-24
1. What occasions are electric gate valves, electric ball valves, electric globe valves, and electric butterfly valves suitable for? These three kinds of electric valves are arranged according to the difficulty of switching: globe valve, gate valve, butterfly valve; arranged according to resistance: globe valve, butterfly valve, gate valve; tightly arranged according to closing: globe valve, butterfly valve, gate valve; arranged according to price: globe valve, Butterfly valve, gate valve; (except special butterfly valve) these three types of valves are driven valves. According to the above characteristics, it is not difficult to see that the globe valve is mainly used for opening and closing and flow adjustment of small-caliber pipelines (branch pipes) or the end of the pipeline; butterfly valves are used for Opening and closing of branch pipes and flow adjustment; gate valves are used for opening and closing of main pipes, and are generally not used for flow adjustment. 2. What types of balance valves are there? What occasion is each suitable for? There are several types of balance valves. The first one is static balance valve, which can be adjusted manually. It can be connected to an instrument to measure resistance and convert it into flow rate. It is a valve whose partial resistance coefficient can be accurately adjusted. It is usually set on the main pipe, and the more demanding ones can also be set at the branch pipe or the entrance of the equipment. The disadvantage is that the system resistance can only be balanced at the rated flow, and the hydraulic balance is affected when the electric valve is set at the end to change the resistance. The dynamic balance valve that came out in the 1990s is used for a constant flow when the system pressure changes, that is, the flow does not change with the change of the system pressure, so it is called a dynamic balance valve. Its use occasions are obvious, and it can only be used in systems with constant water flow, and cannot be used with electric valves. The butterfly plate of the electric butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened. The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop produced by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the butterfly plate. Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being limited by temperature. If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems of thermal power stations. Commonly used butterfly valves include wafer butterfly valves and flange butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipe flanges. Flange type butterfly valve has flanges on the valve, and bolts are used to connect the flanges on both ends of the valve to the pipe flanges. The strength performance of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that bears internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation. Electric ball valve The ball valve evolved from the plug valve. It has the same lifting action by rotating 90 degrees, but the difference is that the cock body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface to the channel opening should be such that when the ball rotates 90 degrees, all the spherical surfaces should be present at the entrance and exit, thereby cutting off the flow. The ball valve can be closed tightly with only a 90-degree rotation and a small torque. The completely equal internal cavity of the valve provides a straight flow channel with little resistance for the medium. It is generally considered that the ball valve is most suitable for direct opening and closing, but recent developments have designed the ball valve to throttle and control the flow. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of the ball valve can be integral or combined. The shaft axis of the electric globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off action, making this valve very suitable for the cut-off or adjustment and throttling of the medium. Once the disc of the shut-off valve is in the open state, there is no longer contact between its valve seat and the sealing surface of the disc, and it has a very reliable cut-off action. This kind of valve is very suitable for cutting or regulating and reducing the medium. Stream usage. Once the shut-off valve is in the open state, there is no more contact between its seat and the sealing surface of the disc, so its sealing surface is less mechanically worn, because most of the valve seats and discs are easier to repair or replace It is not necessary to remove the entire valve from the pipeline when sealing the components, which is very suitable for the occasion where the valve and the pipeline are welded together. The flow direction of the medium through this type of valve has changed, so the flow resistance of the stop valve is higher than that of other valves. Commonly used shut-off valves are as follows: (1) Angle type shut-off valve; in the angle type shut-off valve, the fluid only needs to change its direction once, so that the pressure drop through this valve is smaller than that of the conventional structure.
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