What is A Butterfly Valve ?

- Butterfly valve has simple structure, can be used for low-pressure pipe media. It achieves the opening and closing function by turning a closing piece, names as disc, around a shaft throughout the top to the bottom of it. Butterfly valves can be used to control the flow of various types of fluids, including air, water, steam, and a variety of corrosive media, slurry, oil, liquid metals and radioactive media. It is mainly composed of valve body with a circle shape in the middle, stem/shaft, disc and seat (seal ring) built in the body.

Technical Butterfly Valves

- Dimension: 11/2"-48"

- End Connection: Wafer type, lug type, double flanged, U-section, grooved end

- Body Material: gray iron(GG25), ductile iron(GGG40/50), cast steel(WCB), stainless steel(CF8,CF8M,CF3,CF3M)

- Disc Material: ductile iron(nickle plated or nylon coated) caststeel(A216WCB) stainless steel(CF8,CF8M,CF3,CF3M) aluminium bronze(C954)

- Seat Material:  EPDM, Buna-N(NBR),PTFE, viton, metal seated

- Stem material: SS410,SS416,SS304, SS316

- Actuator: handle lever, worm gear, pheumatic actuator,chain operator

- Standard: API 609, BS5155, MSS SP-67/68, EN593, JIS, ANSI, ASME, DIN

- Origin: China, Korea, Japan, USA, EU, Germany, Malaysia, India, Taiwan

Structure of Butterfly Valve

- Stem of Butterfly Valve

- O-ring of Butterfly Valve

- Body of Butterfly Valve

- Seat of Butterfly Valve

- Disk of Butterfly Valve

Operations of Butterfly Valves

Types of Butterfly Valves

• Different Operated Types of Butterfly Valves

- Lever Operated Butterfly Valve

Lever operated butterfly valve, has a relatively simple structure, small size, lightweight, and better flow control characteristics. When turning the lever, in the butterfly valve body cylindrical inner channel, valve disc is associated with the lever around the axis of rotation, rotation Angle is 0° to 90° when rotating to 90°, butterfly valve is in the fully open state.

Usually, the lever operators are available for size DI50-300(2" - 12"), but it is recommended that gear operators be used on size DN200(8") and larger.

- Gear Operated Butterfly Valve

Gear operated valve regulates the flow of liquid or gas. The disc of the worm gear operated butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly disc rotates around the axis and the rotation angle is between 0° and 90°.

When the rotation reaches 90°, the gear operated valve is in a fully open state. Gear drive has the advantage of saving labor, being easy to operation and longer service life.

- Manual Butterfly Valve

Butterfly valve are driven in a variety of ways: lever-operated, gear operated, pheumatic actuator, chain operator, electric actuator. Both lever operated butterfly valve & gear-operated butterfly valves are manual butterfly valve. Manual means butterfly valve are driven by hands. Compared with pheumatic actuator, electric actuator, manual butterfly valve is simple-structure.

- Electric Actuated Butterfly Valve

- Pneumatic Actuated Butterfly Valve

• Material Types of Butterfly Valves

- Aluminum Butterfly Valves

- Cast / Ductile Iron Butterfly Valves

- Stainless Steel Butterfly Valves

- Cast Steel Butterfly Valves

- Plastic Butterfly Valves

• Connected Types of Butterfly Valves

- Butterfly Valve Wafer Type

Wafer butterfly valve has simple structure, small volume, light weight, and has good fluid control characteristics. Its disc is installed in the diameter direction of pipeline, so the valve can be quickly opened and closed by rotating its disc 90 degrees.

The wafer body is easy to be connected between two pipeline flange with flange bolts, but it cannot be used at end in a fluid system.

- Butterfly Valve Lug Type

Lug butterfly valve has simple structure, small volume, light weight, and has good fluid control characteristics. Its disc is installed in the diameter direction of pipeline, so the valve can be quickly opened and closed by rotating its disc 90 degrees. 

The wafer body is easy to be connected between two pipeline flange with flange bolts, and it can be used at end in a fluid system,when installed with the seat retainer plate on the pressure side(API 609)

Lug butterfly valves designed to comply with MSS SP-67, BS5155 and API 609. Compatible with GB, ANSI, DIN, BS, JIS flanges. Available in size 1½″ to 48″.  Available with handles (1½″ to 12″), manual gear operators (1½″ to 48″), and electric or pneumatic actuators (1½″ to 48″). With many body/trim combinations, Lug butterfly valve can meet your application.

- Butterfly Valve Flange Type

It's the wafer type valves, but the designed U type flanges facilitate the pipeline centering The butterfly plate of the U type butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened.

U-type butterfly valve adopts mounted structure, which reduces the connection bolts of the body under the condition of high pressure and large diameter, enhances the reliability of the valve, and overcomes the influence of system weight on the normal operation of the valve. It can be opened and closed quickly.

- Grooved Butterfly Valve

Grooved end butterfly valves are fixed to the pipes by means of standard clamping couplings. The grooved end clamping system is widely used for indoor fire protection installations since it is a fast and efficient way of joining pipes due to its high degree of flexibility. Furthermore, it absorbs vibrations and noise transmission through the system.