Butterfly valves in Dubai UAE

Butterfly valves are a family of quarter-turn rotary valves that become another product of the Marine Land in dubai company in Dubai and Sharjah in United Arab Emirates. These valves are used in pipelines to cut off flow. It is commonly said that butterfly valves can be used to regulate flow.
The butterfly valve is from a family of valves called quarter-rotating valves in UAE. The procedure for this type of product is that when the valve is closed, the disc is rotated, which completely blocks the passage. When the valve is fully open, the disc is rotated a quarter of a turn to allow almost unlimited fluid passage.

Butterfly valves are a family of quarter-turn rotational motion valves used in pipelines to cut off the flow. It is often said that butterfly valves can be used to regulate flow. However, we do not recommend doing this, as it can damage the valve disc and adversely affect the sealing properties. They are used in a wide range of media and process industries, especially in water supply, collection, and distribution, as well as pumping stations, and have a wide range of applications, especially in separation. One of their key advantages over other families of lions is their simple and compact structure, which results in lighter and lighter end products, smaller installation footprints, and faster excitation speeds.

Hawle butterfly valves are of the eccentric double flanged type (two offsets). Double offset or eccentricity refers to the fact that the valve design consists of two-disc deviations from the center of the valve body or the axis of rotation of the stem.

Butterfly valve parts

The following are the main components of a butterfly valve:

• Body

The valve body is located between the pipe flanges - the most common types of flange end fittings are double-leaf and wafer types.

• Disc

Attached to the body is a disc valve that acts as a gate that stops the flow of fluid or stops the throttle. It can be considered equivalent to a gate in a gate valve or a ball in a ball valve. The disc usually has the patience to receive a stem or shaft. To improve the flow, sealing, and/or operating torque, there are many changes in the design, orientation, and material of the disc. For example, the 9881k Hawle Dual Abnormal Disk is designed to reduce seal wear and "scratch" as well as the operating torque required.

• Seat

The inner valve body cover is a strong metal elastomer or anti-leak seal that secures the disc in a closed position to achieve a complete cut. The 9881k series stainless steel integrated body seats with welding and micro-finish ensure the seat surface is resistant to corrosion and abrasion. With this special type of seat design, valve drop can be tightened according to EN12266-A requirements.

• Stem

The valve shaft, often referred to as the shaft, is the component that connects the disc to the excitation mechanism and transmits torque through it.

• Seals

Seals are available at several interfaces inside the valve to ensure a firm seal during operation or to separate the process environment from the internal components of the valve for a more flexible and cost-effective design.

Sealing on the seat is ensured by an elastic sealing ring with a T-profile held by a retaining ring at the edge of the disc, preventing the sealing ring from opening. When closed, the sealing ring is pressed against the seat surface, creating a tight seal at both the upstream and downstream ends. In the open state, the sealing ring is completely stress-free due to the eccentric dual-disc design.

By eliminating the interaction between the process environment and the stem/shaft, the multiple O-ring shaft sealing system ensures maintenance-free sealing for the entire life of the valve. In addition, there are smaller, more common components such as bushings, bearings, and clamps that are part of other valve structures. Details of some actuator components such as handlebars, levers, gearboxes, and carts will be covered in the activation section.

Butterfly valve working principle

Making a butterfly valve is relatively simple, and the rotation of the valve disk controls the flow of fluid. In the closed position, the disc blocks the valve hole, while in the open position, the disc is oriented perpendicular to the flow direction to allow current to flow. Impeller valves generally provide two-way flow and shut-off capability. However, they are not full of holes, which makes them unsuitable for pigmentation or swabs. The body of the cast iron is flexible with epoxy powder coating on the interior and exterior surfaces. Valves are usually operated by hand wheels, gears, or actuators, or a combination thereof based on specific application needs and technical specifications. In the following article, we will discuss activation methods.

Butterfly valve actuation

There are several ways to operate or actuate a butterfly valve - manual, semi-manual, or fully automatic.

• Electric

It uses an electric actuator to control the valve with a 4-20 mA control signal and is usually used for fine-tuning and time-sensitive applications.

• Pneumatic

Also used for high precision application and uses compressed air for stimulation.

• Hydraulic

It is usually used for applications that require high torque to open and close the valve, such as high pressure and high viscosity applications.

• Manual

Manual-operated Korean valves use a cart, crankshaft, or lever to operate the valve. Smaller hand valves are usually mounted with a lever. For larger sizes, a wheelbarrow is provided and comes with a gearbox to transmit torque with a high mechanical advantage. Another way is manual activation in cases where the valve is buried underground without a manhole. In such applications, activation is performed with an expansion spindle, an adapter / square cap, and a corresponding T key from the ground.

Due to the inherently lower torque requirement, the size and installation of actuators for butterfly valves are less expensive than others, such as gate valves.

The 9881k series comes standard with a manual gearbox and gears with an auto-locking design feature that minimizes gear reaction and ensures proper operation and rigidity of the end device. Also compatible with external actuators with ISO 5210 high flange for multi-rotational actuators.

Benefits of Butterfly Valves

Depending on the application, butterfly valves can have significant advantages over other types of valves, especially for dimensions over 200 DN (200 mm) in size:

• Lightweight and compact

With a compact design and smaller face-to-face dimensions, butterfly valves have significantly fewer installation footprints and offer lower installation costs, including labor costs, equipment, and pipe support.

• Low maintenance requirements

An inherently simple and economical design consisting of few moving parts, resulting in fewer wear points, significantly reduces maintenance requirements.

• Fast action

90-degree rotation of the handle or mechanism provides the trigger, closing or fully opening the valve. However, with larger impeller valves, a gearbox is often required as part of the actuating mechanism, which reduces operating torque and simplifies valve operation, but at the cost of deceleration.

• Low cost

Butterfly valves require fewer materials due to their simple design and are easier to design and manufacture and are often a more cost-effective choice than other types of valves. Cost savings are achieved mainly in larger milk sizes, usually above DN 300.

• Versatility

Butterfly valves have a wide variety of uses, including underground installation.