Common types of electric butterfly valves.
Release time:
2024-11-27
Electric butterfly valves, commonly referred to as drainage valves in daily life, are often used in many steam systems. They can quickly discharge various impurities from the steam system, such as the large amounts of carbon dioxide and condensate that often exist in steam systems for extended periods. Over time, this can affect the system's lifespan and hinder its normal operation. Installing an electric butterfly valve can solve such problems. So, what are the common types of electric butterfly valves? The butterfly valve manufacturer will tell you.
1. Free floating ball steam valve
The free floating ball steam electric butterfly valve utilizes the principle of buoyancy. The float ball rises and falls according to the amount of condensate, automatically adjusting the opening of the valve seat to continuously discharge condensate. When the condensate stops entering, the float ball descends to the bottom, returning to the closed position and stopping the drainage. Since the drainage valve seat of the electric butterfly valve is always below the condensate level, it forms a water seal, naturally separating water and gas, achieving no steam leakage.
2. Diaphragm steam valve
The main action component of the diaphragm steam electric butterfly valve is a metal diaphragm, filled with a liquid that has a vaporization temperature lower than the saturation temperature of water. When the device starts, low-temperature condensate appears in the pipeline, and the liquid inside the diaphragm is in a condensed state, keeping the valve open. As the temperature of the condensate gradually rises, the liquid inside the diaphragm begins to evaporate, increasing the pressure inside the diaphragm, which drives the valve core to move towards the closed position. The electric butterfly valve completely closes before the condensate reaches the saturation temperature, with the diaphragm controlling the valve's opening and closing in response to steam temperature changes, serving to block steam drainage.
3. Inverted bucket valve
The inverted bucket electric butterfly valve has an inverted bucket as a liquid level sensitive component, with the opening of the bucket facing downwards. The inverted bucket is connected to a lever that drives the valve core to open and close the valve. The inverted bucket electric butterfly valve can discharge air, is resistant to water hammer, and has good anti-pollution performance. The electric butterfly valve has many connecting parts, and its sensitivity is not as good as that of the free floating ball electric butterfly valve. Since the inverted bucket electric butterfly valve relies on steam buoyancy to close the valve, it is not suitable for use under small working pressure differentials.
Different electric butterfly valves from manufacturers have slightly different working methods. They generate different pressure differentials, use different accessories, and are applied in different locations. Generally, relevant organizations focus on energy-saving effects and sealing performance when purchasing electric butterfly valves. If there is a requirement for no steam leakage, one can also choose a bimetallic strip steam valve or a thermodynamic valve. Butterfly valves can also be installed in specific locations, but it is necessary to pay attention to following their usage requirements; otherwise, the area around the butterfly valve may rust or be damaged.
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