What is a Butterfly Valve?
A Van bướm is an electronic device that regulates liquid and gas flows. It consists of a disc that rotates around its stem.
The stem seals on valve discs guarantee a tight shutoff of fluid within the valve. They can be made of various materials depending on what’s needed for each application.
Flow Control
Butterfly valves or Van một chiều are useful for controlling liquid and gas flow. They’re often employed in wastewater collection and treatment applications due to their straightforward design and few internal parts, which minimize maintenance requirements and breakdowns.
They seal effectively against service media and respond rapidly to control signals, making them ideal for municipal water distribution systems and select wastewater treatment applications.
Additionally, butterfly valves can be constructed from metal, expanding their application range and offering a cost-effective alternative to plug and ball valves.
The primary disadvantage of a butterfly valve is its limited throttling control range. Unlike globe and segmented ball valves, butterfly valves do not perform optimally outside this range (30-50% open).
Flow Regulation
Butterfly valves are quarter-turn valves that open and close incrementally, unlike ball valves where the disc always remains in the flow and there’s always a pressure drop present.
This valve can be employed for on-off and throttling services to regulate the speed and capacity of liquids or gases. It works well in large pipe sizes as well as when operating at high pressures or speeds.
Selecting the ideal butterfly valve for your application depends on its operating conditions, maintenance needs and level of automation. The most economical choice is usually a resilient seated valve.
Conduct regular inspections of the actuator to identify and rectify any loose electrical, pneumatic or hydraulic connections. Furthermore, lubricate components with lithium-based grease when possible.
Pressure Regulation
Butterfly valves or Đồng hồ nước not only control flow, but they also feature pressure regulation. This enables the valve to open and close within a controlled range, reducing the required pressure for operation.
Pressure regulation is achieved through dynamic pressures generated by fluid passing through a valve. These forces cause an unbalanced torque on the disc, which eventually causes it to close.
When selecting butterfly valves, the seat material is an important consideration as it must be compatible with both the media being handled and capable of withstanding operating temperatures and pressures. Elastomeric seats tend to be preferred over metal ones due to their ease of cleaning.
Valve bodies can be constructed from carbon steel, stainless steel or other alloys depending on their application, operating environment and lifespan. They may be welded, cast or molded for convenience.
Safety
The butterfly valve is an essential safety component in any processing system. These valves help prevent accidents by allowing operators to control fluid flow.
Selecting the ideal butterfly valve for your application can help protect employees and reduce costly downtime. A reliable option when it comes to safety functions is one that has a SIL-3 or higher rating.
Fire-safe butterfly valves are designed with various designs to function optimally even during a fire situation. Manufacturers take into account factors like the temperature of a fire and what type of process liquid the valve is handling when creating their designs.
Fire-safe butterfly valves usually feature two-tier sealing configurations. The primary sealing seat provides bubble tight, leakage free sealing in normal conditions; while the secondary sealing seat permits minimal leakage when a fire is present.
