Unlike manual lever ball valves that are often referred to as quarter turn or shut off valves, van bi điều khiển điện typically use an electrical actuator to control the flow of media.
There are various types of electric actuated ball valves, based on size and number of ports. These include full-port, reduced-port, V-port and multi-port ball valves.
Size and DN
A ball valve is a quick-opening, quarter-turn valve that is available in many sizes. They are commonly used for on/off service, but can also be used for throttling.
They use a shaped seat and a metal-to-metal secondary seal to protect the valve from media. They are available in both floating ball (FB) and trunnion-mounted styles.
Typical ball valves have two ports, but three-port models are also available. This allows you to direct the media flow in a more precise way than with the standard two-port designs.
These valves are typically made of stainless steel or plastic, and can be corrosion resistant. Some are explosion proof and can withstand sparks that might ignite flammable materials in hazardous locations.
Depending on the size and type of valve, electric actuators come in various configurations with power-failure protection, position indicator lights, LED status lights, over-torque protection, condensation heaters and thermal overload protection. They are available in a variety of enclosures and offer long cycle life.
Flow Rate and Pressure
An van bi điều khiển điện provides high flow rates and precision. It also has a turndown ratio (ratio of maximum to minimum flow) and a low pressure drop across its open area.
The turndown ratio allows a proportional input signal from an actuator to deliver consistent flow rates at small valve openings. It also eliminates the jump effect that can occur when a valve turns rapidly.
Compared with globe valves, ball valves offer higher rangeability and turndown. They are also much more cost-effective in HVAC and process control applications.
Flow-Tek’s characterized control ball valves deliver controllable flow characteristics from the nearly closed to the fully open position, even when ports are not parallel. The valve’s in-line design increases media control and rapid response to controller commands.
Power Source
A typical electrically controlled ball valve requires a power source to operate. This power source is connected to a motor that controls the position of the valve.
These electric actuated ball valves are a popular choice for valve automation. They have a part-turn rotary design and are available in a variety of materials, pressure classes, and end connections.
The power to open and close of these valves is derived from a negligible amount of electricity charging an internal capacitor. This energy is only used during the time that the motor is moving to open or close the valve.
These motorized electric valves are ideal for a wide range of applications and they are suitable for most clean gases and liquids, including water and weak acids and slightly corrosive chemicals. They are also suited to high-pressure applications.
Maintenance
When installed and maintained correctly, an electrically controlled ball valve can last up to 10 years. However, this lifespan is not guaranteed.
The actuators of electric actuated ball valves convert electric current into pulses that respond to pipeline pressure conditions to open or close the valves. This helps in the automation of process control valves and reduces maintenance expenses.
To increase the life of a valve and its actuator, it is important to ensure that the valve is properly sealed. This is to protect the seals from debris and other particles that can damage them or cause seal failure.
In addition, the seat must be kept clean to prevent foreign matter from causing seat leakage. This can be done by regularly cleaning the valve and using lubricative media to protect the seals.
Aside from the aforementioned maintenance steps, there are a few other things that you can do to prolong the life of your electric actuated ball valve. These include:
