Weidouli Control Ball Valves contain an On-off control ball valve(O type ball design) and a Control Segment ball valve(V type ball design).

The on-off control ball valve is evolved from plug valve, the opening and closing parts is a ball, using the ball goes around the axis of the stem 90 degrees to achieve the air of opening and closing. The on-off ball type control valve is mainly used for cutting, rolling, distributing, and changing the flow direction of the medium in the pipeline.

Control Segment Ball Valve is designed as V-shaped ball openings, having good flow controllability. Segment ball has shearing action with metal seat. The ball valve is applicable in some fluids such as Fibers, micro granules and slurry etc. Sealing face is self-clearance. When the ball rotates away from the seat, the fluid in the pipe will averagely flow through the ball sealing face in 360 degrees. This design can avoid the scouring on the seat and wash away the accumulation, namely the self-clearance.

The Features of Control Ball Valves

The ball valve stem is hardened to form a protective film on the surface, which improves the corrosion resistance and surface hardness, and makes the switch flexible and not easy to scratch.

Three layer-sealing protections at the packing: back seal, O-ring seal, packing seal

Anti-leakage packing and packing box

The packing and seat employ imported PTFE or flexible graphite as the material

Fire-safe and anti-static

Blowout-proof stem

V-type gland flange

Floating or Trunnion structure

ISO 5211 mounting pad

If you are looking for a reliable v shaped valve balls factory, please contact us.

As a professional valve company, Weidouli valves provides quality china check valve made in china at competitive wholesale prices. Feel free to contact at any time.

Control butterfly valves of Weidouli are designed and manufactured in strict accordance with the latest version of API 609 specification, meanwhile, our company can also meet BS5155, ANSI B 16.34, ASME SEC VIII, and other major specifications, which ensures that our control butterfly valve can fit in all industrial fields.

A control butterfly valve is a valve that can be used for isolating or regulating flow. It is called a quarter-turn valve too. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut-off. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Control butterfly valves with double offset design and triple offset design. Control butterfly valves are generally favored because they are lower in cost than other valve designs as well as being lighter in weight.

The Features of Control butterfly valves

Double safe construction

According to the specifications of API609, two independent thrust collars are installed at the lower side of the disc to prevent disc deformation, valve stem dislocation and sealing surface occlusion caused by fluid pressure and temperature, thus ensuring the normal operation of the valve in any working conditions; Meanwhile an independent valve stem ejection mechanism is designed at the lower end of the valve to prevent unexpected accidents caused by valve stem breakage or ejection.

No dead band

In the design process, we consider the regulation and control application, so we make the most of the sealing principle of triple offset butterfly valve to achieve that the disc does not scratch the seat and the torque of the stem is transmitted directly to the sealing surface through the disc when the valve is switched on and off, that is to say, there is almost no friction between the disc and the valve seat, thus eliminating the jump phenomenon and the inability of regulation caused by various unstable factors such as friction in the low opening range of valve, which means the dead band is eradicated. This means that our butterfly valve can enter the adjustable region from zero to 90 degrees, and its normal control ratio is more than twice that of the general butterfly valve, and the highest control ratio can be as high as 100:1.

The laminated seat of a triple offset butterfly valve

The valve seat is made of metal sheet and graphite sheet, which can effectively prevent the influence of small solids in the medium and the sealing surface occlusion caused by thermal expansion, ensuring that it has no leakage even if there exists minor failure.

The replaceable seat of a double offset butterfly valve

Our butterfly valve sealing pair is unique. The valve body seat can be replaced, and since the disc sealing surface and the disc are independent, the disc sealing surface can also be replaced, which means it is no longer necessary to transport the damaged disc to the butterfly valve company or decompose the valve, just needs to replace the sealing surface of the butterfly plate. This not only greatly reduces the maintenance cost, but also greatly reduces the maintenance time as well as maintenance intensity and difficulty.

Fire-safe structure

Our triple offset butterfly valves are fire-safe design and have obtained the certificates of API607 and API6FA, which ensures that our triple offset butterfly valve can be used in various dangerous areas such as petroleum, petrochemical, and so on.

Super seal packing

Traditionally, the leakage of valve seats (Internal leakage) has been the focus, while the leakage of packing parts (External leakage) has been neglected. In fact, now it is indisputable that external leakage is far more harmful than internal leakage. A triple offset butterfly valve is a rotation valve, whose stem only makes 90-degree rotation. Compared with spiral multi-rotation of valve stem in gate valve and globe valve, its wear degree of packing part is lower and its service life is longer. In terms of external leakage, we have adopted the highest standard design, which can guarantee the standard sealing performance below 100 ppm when conducting external leakage tests in accordance with EPA21 specification.

Hawking Metal Surface Processing Technology

The surface roughness of the elements processed by the Hawking Machine is less than Ra0.2, which improves its surface hardness and wear resistance, reduces the wear of sealing filler and the valve torque, and makes the seal of the dynamic sealing part more reliable.

Spring-loaded to compensate seal automatically

The belleville spring is used to load the connecting bolt of gland flange to prevent an abnormal change of pressure and temperature in the pipeline. The belleville spring can automatically compensate for and protective sealing.

There are many butterfly valves manufacturers, but we are the best choice for you.

As a professional valve manufacturer, Weidouli valves provides quality china check valves made in china at competitive wholesale prices. Feel free to contact at any time.

Check valve is a valve referred to the opening and closing parts for the circular disc and by its own weight and medium pressure to block the media flow back.

It belongs to automatic valve class, also known as check valve, check valve, return valve or isolation valve. Disc movement is divided into lifting type and swing type. Lift check valves are similar in construction to globe valves except for the lack of a stem to drive the disc. The medium flows from the inlet end (the lower side) and flows from the outlet end (the upper side). The valve is opened when the inlet pressure is greater than the sum of the weight of the disc and its flow resistance. On the contrary, the valve is closed when the medium flows backwards. Swing check valves have a tilt and can rotate around the axis of the disc, the working principle is similar to the lift type check valve.

Check valves are often used as bottom valves in pumping devices to prevent water from returning. Check valve and globe valve combined use, can play the role of safe isolation. The disadvantage is that the resistance is large, and the sealing is poor when it is closed.

Design feature of Check valve

Weidouli supply of many types of Check Valves

Swing Flanged Check Valves

A basic swing Check valve consists of a valve body, a bonnet, and a disk that is connected to a hinge. The disk swings away from the valve-seat to allow flow in the forward direction, and returns to valve-seat when the upstream flow is stopped, to prevent backflow.

The disc in a swing type Check valve is unguided as it fully opens or closes. There are many disk and seat designs available, in order to meet the requirements of different applications. The valve allows full, unobstructed flow and automatically closes as pressure decreases. These valves are fully closed when flow reaches zero, in order to prevent backflow. Turbulence and pressure drop in the valve are very low.

Lifting Flanged Check Valves

Lift Check valves are particularly suitable for high-pressure service where velocity of flow is high. In lift Check valves, the disc is precisely guided and fits perfectly into the dashpot. Lift Check valves are suitable for installation in horizontal or vertical pipe-lines with upward flow.

Dual plate wafer check valves

Dual Plate Wafer Check Valves were originally introduced in the late 1950s and quickly became the check valves of choice for many piping engineers because of their proven reliability and low-pressure drops. They have become the standard for process and project engineers worldwide and are used extensively in Power Plants, Refineries, Chemical Plants, Wastewater Treatment Plants and Pulp & Paper Mills.

Nozzle Check Valves

Nozzle check valves are incredibly useful for water pipelines and systems. These valves are engineered to control and protect against pressure surges that can occur in water lines. They also work to prevent water hammer and reverse flow.

Nozzle check valves are constructed with a spring-assisted disc. When fluid pressure in the valve is higher than the cracking pressure, or the pressure needed to open or close the valve, the spring lowers the disc to prevent reverse flow.

The valve is also manufactured to include a guide to keep the disc moving in a vertical. This allows it to re-seat properly.

If you are looking for a reliable lift check valve factory, please contact us.

Reach out to high alloy valves, as the check valve company in China, for a pricing inquiry today.

There are many valve vendors, but we are the best choice for you.

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Ball valves are used to cut off or connect the medium in the pipeline, as well as to regulate and control the fluid. As a professional manufacturer of customized valves, we can provide you with all kinds of floating and trunnion mounted ball valves.

Hand ball valve mainly feature compact structure and reliable sealing. The sealing surface and spherical surface are often closed, which means it's not easy to be eroded by medium and easy to operate and maintain. Weidouli is a professional manual ball valve manufacturer and valve manufacturing company that has different types of ball valves for sale. We are good at making cast hand operated valve and forged ball valve with various special alloys, which are suitable for general working media such as water, solvent, acid and natural gas, as well as suitable for bad working.

Why Choose WSV Valve ball valves wholesale?

Custom Engineered for Your Application

Full Range of Corrosion-Resistant Alloys

Competitive Wholesale & Bulk Pricing

30+ Years of Manufacturing Expertise

Manual Ball Valve Advantages

1. Soft seated ball valve or metal seated ball valves for high temperature

2. Full bore and reduced bore ball valve

3. Fire-safe and anti-static device

4. Double block and bleed function

5. Grease injection for seat and stem

6. Blowout-proof stem

7. Self cavity pressure relief

8. Gland locking device

9. Anti-leakage packing and packing box

10. ISO 5211 mounting pad

Hand Ball Valve Specification

Design standard: API, ASME, EN, ISO, JIS, DIN, BS, GB

Pressure rating: CLASS 150LB~2500LB, 1.0MPa~42.0MPa, JIS 10K~40K

Size range: NPS 3/8"~48", DN8~DN1200

End connections: flange, wafer, threaded, butt weld, socket weld  

Operation: handle lever operated ball valve, gear operated ball valve, pneumatic operated ball valve, hydraulic actuator, electric actuator

For more information about ball valve action, please feel free to contact us!

As a professional butterfly valve manufacturer china, Weidouli valves provides quality hand operated valve at competitive wholesale prices. Feel free to contact at any time.