How To Correctly Understand Valves

You need to grasp the differences between each valve and only know what kind of valve you are suitable for when purchasing it. The stem axis of the shut-off valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short and has a very reliable cut-off action, making this valve very suitable for cutting, adjusting, and throttling the medium. Once the valve disc of a shut-off valve is in an open state, there is no longer contact between its seat and the sealing surface of the valve disc, and it has a very reliable cut-off action. This valve is very suitable for cutting, adjusting, and throttling as a medium.
The valve disc is polished into a plunger and connected to the valve stem, and the sealing is achieved by two elastic sealing rings sleeved on the plunger. Two elastic sealing rings are separated by a sleeve ring and the sealing ring around the plunger is pressed firmly by the load applied by the valve cover nut on the valve cover. The elastic sealing ring can be replaced and can be made of various materials. This valve is mainly used for "opening" or "closing", but it is equipped with a special form of plunger or special collar, which can also be used to regulate flow.
Once a shut-off valve is in an open state, there is no longer contact between its seat and the sealing surface of the valve disc, resulting in less mechanical wear on its sealing surface. Due to the ease of repairing or replacing sealing components for most shut-off valves, the entire valve does not need to be removed from the pipeline. This is very suitable for situations where the valve and pipeline are welded together. When the medium passes through such valves, the flow direction changes, so the flow resistance of the shut-off valve is higher than that of other valves.
There are several commonly used globe valves: 1) angle globe valves; In angle globe valves, the fluid only needs to change direction once, so that the pressure drop through this valve is smaller than that of conventional globe valves. 2) Direct flow shut-off valve; In direct flow or Y-shaped globe valves, the flow path of the valve body is inclined with the main flow path, which reduces the degree of damage to the flow state compared to conventional globe valves, and therefore reduces the pressure loss through the valve. 3) Plunger type globe valve: This form of globe valve is a variant of a conventional globe valve. In this valve, the disc and seat are usually designed based on the plunger principle.
The butterfly plate of the pneumatic butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly plate rotates around the axis, with a rotation angle between 0 ° and 90 °. When the rotation reaches 90 °, the valve is fully open.
The electric butterfly valve has a simple structure, small size, and light weight, and is only composed of a few parts. Moreover, the valve can be quickly opened and closed by rotating it 90 °, with simple operation and excellent fluid control characteristics. When the butterfly valve is in the open position, the thickness of the butterfly plate is the resistance of the medium flowing through the valve body, so the pressure drop generated through the valve is very small, so it has good flow control characteristics. Butterfly valves have two types of sealing: elastic sealing and metal sealing. Elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate.
Valves with metal seals generally have a longer lifespan than valves with elastic seals, but it is difficult to achieve sealing. Metal seals can adapt to higher working temperatures, while elastic seals have temperature limitations. If a butterfly valve is required for flow control, the main thing is to choose the correct size and type of valve. The structural principle of butterfly valves is particularly suitable for making large-diameter valves. Butterfly valves are not only widely used in petroleum, gas, chemical, water treatment and other general industries, but also used in the cooling water system of thermal power station.
There are two commonly used butterfly valves: wafer type butterfly valve and flange type butterfly valve. A wafer type butterfly valve is a valve that is connected between two pipeline flanges using double headed bolts. A flange type butterfly valve is a valve with a flange, and the flanges at both ends of the valve are connected to the pipeline flange using bolts.
Valves have a long history, and the valve industry in China has been striving to move forward, using better materials to make better and more durable valves. High quality Bellevue valves are worthy of your trust, and we are your good partners.