China Customized Butterfly Valves Suppliers - Low Price Butterfly Valves

Your Professional Butterfly Valves Supplier

Hengde Rui Mai Trading Co., Ltd. is a professional and competitive supplier of pipes, valves, and fittings. It has more than

ten years of experience in helping foreign customers develop high-quality, suitable valves, filters, electric actuators, and pipe fittings.

Quality Assurance

As part of your quality control department in China, we can oversee product quality in every order from your factory.

Widely used

Our products are suitable for water supply and drainage, sewage treatment, metallurgy, mining, chemical industry, power supply, construction and installation, etc.

Private Brand

Since 2010, we have successfully cooperated with some European companies and Southeast Asian companies to OEM produce wafer butterfly valves and elastic gate valves in China. The "EH" brand pipe fittings produced by the company are exported to Malaysia, Thailand, Vietnam, Egypt, Russia and other countries.

Professional service

Assist in designing special molds suitable for the local market before sales; supervise the quality of goods during the production process; promise to compensate for any single unqualified product during the warranty period.

Wafer Butterfly Valve-M
Size: DN50-DN300 Working pressure: 16 bar Temperature range: -20°C - 120°C Operation: Handle/Worm gearConnection ends: BS EN 1092 PN10/16, AS 2129 TABLE E, JIS B2212 10K, BS 10TABLE D/E
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Stainless Steel Wafer Butterfly Valve
Size: DN50-DN300 Operation: Handle/Worm gear/Electric actuator Working pressure: PN16 Temperature Range: -20℃ - 200℃ Connection Ends: BS EN 1092 PN10/16
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Ductile Iron Butterfly Valve Wafer Type
Size: DN50-DN300Operation: Handle/Worm gear. Working pressure: PN10/16. Temperature Range: -10℃ - 100℃. Connection Ends: BS EN 1092 PN10/16, AS 2129 TABLE E, JIS B2212 10K, BS 10 TABLE D/E.
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High Quality Wafer Butterfly Valve
Size: DN40-DN800. Operation: Handle/Worm gear/Electric actuator. Working pressure: PN16. Temperature Range: 0°C - 120°C. Connection Ends: BS EN 1092 PN10/16, AS 2129 TABLE E, JIS B2212 10K, BS 10 TABLE D/E.
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Ductile Iron Butterfly Valve Lug Type
Size: DN50-DN600. Operation: Handle/Worm gear. Working pressure: PN16. Temperature Range: 0°C - 120°C. Connection Ends: BS EN 1092 PN10/16,.
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Double Flange Butterfly Valve
Size: DN50-DN1000. Operation: Handle/Worm gear. Working pressure: PN10/16. Temperature Range: 0°C - 110°C. Connection Standard: Flange according to EN 1092 ISO PN10/16Face-to-Face: EN558-1, DIN3203/F4
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Double Eccentric Butterfly Valve
Size: DN100-DN800. Operation: Worm gear. Working pressure: PN10/16. Temperature Range: 0°C - 80°C. Connection Standard: Flange according to EN 1092 ISO PN10/16 Face-to-Face: EN558-1, DIN3203/F4
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Wafer Butterfly Valve-L
Size: DN40-DN800. Operation: Handle/Worm gear. Working pressure: PN10/16. Temperature Range: -10°C- 80°C. Connection ends: BS EN 1092-2 PN10/16, JIS B2212 5K/10K, ASME B16.47 150LB
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productcate-350-381

What is a Butterfly Valve?

Butterfly valves are a series of quarter-turn rotary motion valves used in pipelines to cut off flow. People often say that butterfly valves can be used to regulate flow. However, we do not recommend this as it may damage the valve disc and negatively affect sealing performance.

Advantages of the butterfly valve

Depending on the application, butterfly valves have significant advantages over other valve types, especially for sizes over DN 200 (200 mm):

Lightweight and compact

The butterfly valve has a compact design, and smaller face-to-face dimensions, which greatly reduces the installation footprint, and saves costs with lower installation costs (including labor costs, equipment, and pipeline support).

Low Maintenance Requirements

The inherently simple, economical design consists of few moving parts and therefore fewer wear points, significantly reducing maintenance requirements.

Quick action

A 90° rotation of the handle or drive mechanism fully closes or opens the valve. However, for larger butterfly valves, a gearbox is usually required as part of the actuating mechanism, which reduces operating torque and simplifies the operation of the valve, but at the expense of speed.

Low cost

Due to their simple design, butterfly valves require less material, are simpler to design and manufacture, and are generally a more economical choice compared to other valve types. Cost savings are mainly seen in larger valve sizes, typically DN 300 and above.

Versatility

Butterfly valves have a variety of uses, including the ability to be installed underground.

Butterfly valve parts

The following are the main components of a butterfly valve:

Valve Body

The valve body is installed between pipe flanges - the most common types of end connections are flanged, double lug and wafer.

Disc

Connected to the valve body is the valve disc, which functions as a gate to prevent or throttle fluid flow; it can be thought of as equivalent to the gate plate in a gate valve, or the ball in a ball valve. The disc is usually drilled to accommodate the valve stem or shaft. There are many variations in disc design, orientation, and materials to improve flow, sealing, and/or operating torque.

Seat

The internal valve body is lined with a strong elastomer or metal leak-proof seal that holds the disc in the closed position for complete closure. Stainless steel welded filler and micro-finished one-piece seats ensure the seat surface is corrosion- and erosion-resistant.

Stem

The valve shaft, also commonly referred to as the valve stem, is the component that connects the valve disc to the actuator and transmits torque through itself.

Seals

Seals are present at multiple interfaces within the valve to ensure a tight seal during operation or to isolate the process media from the valve's internal components for a more flexible and cost-effective design.

The sealing of the valve seat surface is ensured by a continuous T-shaped elastic sealing ring, which is fixed to the periphery of the valve disc by a back-up ring to prevent the sealing ring from rolling. In the closed position, the sealing ring is pressed against the valve seat surface, providing a tight seal at the upstream and downstream ends. In the open position, the sealing ring is completely stress-free due to the double eccentric design. By eliminating interaction between the process media and the valve stem/shaft, the multi-O-ring shaft sealing system ensures maintenance-free sealing throughout the life of the valve. In addition, there are smaller, more common components such as bushings, bearings, and fasteners that are also part of the construction of most other valves. Details of some of the components on the drive side, such as handles, levers, gearboxes, and handwheels, are covered in the drive section.

Butterfly valve working principle

The structure of the butterfly valve is relatively simple, and the flow of fluid is controlled by the rotation of the valve disc. In the closed position, the valve disc blocks the valve hole, while in the open position, the valve disc is perpendicular to the direction of flow to allow flow. Butterfly valves typically provide bidirectional flow and shutoff capabilities. However, they are not full bore, which makes them unsuitable for pigging or wiping. The main body material is ductile iron, and the inner and outer surfaces are coated with epoxy powder coating. Depending on the specific application requirements and specifications, valves are typically operated by handwheels, gears, or actuators, or a combination thereof. We will discuss driver methods later in this article.

Butterfly valves Application

They are widely used in various process media and industries, especially water supply, collection and distribution, and pumping stations, and have a wide range of use cases, especially in flow isolation.

Butterfly Valve Type

There are two key topics when discussing butterfly valve types: valve body and stem offset. The valve body refers to the connection method between the valve body and the pipeline, and the valve stem offset refers to whether the valve stem passes through the center of the valve disc or is offset.

Butterfly valve body types are:

Double flange

This design is typically used on larger butterfly valves. Wafer: Most cost-effective design; sandwiched between two pipe flanges.

Single flange

This design attaches to both sides of the pipe using bolts and nuts that pass through the valve hole.

Lug style

This design has threaded inserts and uses bolts to attach the pipe flange to each side. Suitable for removing pipes from one side without affecting the other side.

Flangeless

Like the wafer type, this design is sandwiched between two pipe flanges.

Butt welding end

Prepared for welding directly to the pipe.

U-shaped Section

Also sandwiched between pipe flanges, suitable for end-of-line services.

FAQ

Q1: What is the purpose of the butterfly valve?

A: Butterfly valves are used where space is limited. Unlike gate valves, butterfly valves can be used to throttle or regulate flow, and can be used in fully open and fully closed positions. Compared with gate valves, butterfly valves have smaller pressure losses.

Q2: How does a butterfly valve work?

A: The basic operation of a butterfly valve is achieved by turning the handle 90° or using a pneumatic or electric actuator. This turns the valve stem, which causes the valve disc to rotate. In the fully closed position, the valve disc is perpendicular to the direction of flow, while in the fully open position, the valve disc is parallel to the direction of flow. Partial opening or closing of the valve disc can achieve proportional or throttling flow. For large butterfly valves or valves used in liquid applications where rapid closing may produce a water hammer, butterfly valves may be geared through a transmission. However, the handwheel of the gearbox must be turned more than 90°, which eliminates the relatively fast closing speed of the butterfly valve.

Q3: Under what circumstances is a butterfly valve recommended?

A: Typically, butterfly valves are installed in auxiliary circuits where control is not considered critical, or in circuits where the pressure drop in the system must be limited and the designer requires a line-size valve with little or no obstruction to the flow path.

Q4: Why is it called a butterfly valve?

A: Butterfly valves are so named because their movement resembles the wings of flight. The rod resembles the body of a butterfly, while the movement of the disc resembles the butterfly's wings. The movement of the butterfly valve is similar to that of a butterfly when its wings move up and down 90 degrees when it lands.

Q5: How to identify butterfly valves?

A: Butterfly valves get their name from the shape of their valve bodies and closing elements. They are simple in design, have fewer parts, and are easy to repair and maintain. Valve Body - The body of a butterfly valve is installed between two pipe flanges. There are two types of valve bodies: lug type and wafer type.

Q6: Do butterfly valves need lubrication?

A: Butterfly valve discs used in dry applications such as compressed air require lubrication. Butterfly valves that cycle infrequently should be operated at least once a month.

Q7: How many turns does a butterfly valve need to turn to close?

A: The handwheel or nut must be turned 7-50 turns (depending on the model) to open or close the butterfly valve.

Q8: Does the butterfly valve close tightly?

A: Butterfly valves are suitable for systems with clean fluids. Due to their disc sealing system, they are not suitable for fluids containing slurry or grit. By design, when the disc is in the vertical position, the disc rests against the internal seal, creating a tight closure.

Q9: How to lubricate a butterfly valve?

A: The valve stem thread often rubs against the valve stem nut and should be lubricated with a little butter or graphite powder. For valves that do not open and close frequently, the handwheel should be turned regularly and lubricating oil should be added to the valve stem thread to prevent it from being bitten.

Q10: What is the sealing ring on a butterfly valve?

A: Butterfly valve seals are important components for blocking all three potential leakage paths: sealing of pipes, flanges, and operating shafts in globe, butterfly, and disc valves.

We're professional butterfly valves suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized butterfly valves at low price from our factory. For more cheap products, contact us now.

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