Home > Knowledge > Content
Products Categories
Contact Us

Tel: +86-021-51827608

Fax: +86-021-80322732

E-mail: sales@china-flow.com

Add: No.68 Huishen Road ,Jiading Industrial Zone,Shanghai China PRC 201802 

Butt welding butterfly valve
May 29, 2018

Butt welding butterfly valve

The wafer type butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. And only need to rotate 90 degrees to open and close quickly, the operation is simple, at the same time the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. The butterfly valve has two types of seals: elastic seal and metal seal. Elastic sealing valve, sealing ring can be mounted on the valve body or attached around the butterfly plate.

       The butterfly plate of the welding butterfly valve is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical passage, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0°-90°, and when the valve rotates to 90°, the valve is fully open.

       Valves that use metal seals generally have longer life than elastomer-sealed valves, but they are difficult to completely seal. Metal seals can accommodate higher operating temperatures, while elastomeric seals have temperature-restricted defects.

       If the butterfly valve is required to be used as a flow control, it is mainly the correct choice of the size and type of the valve. The structural principle of the butterfly valve is particularly suitable for making large-diameter valves. Butterfly valves are used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants.

       The commonly used butterfly valves are two-way butterfly valves and flange-type butterfly valves. The wafer type butterfly valve is connected with the valve between the two pipe flanges with stud bolts. The flange type butterfly valve is provided with a flange on the valve, and the upper flanges of the valve are connected on the pipe flange with bolts.

       The performance of butt welding butterfly valve and gate valve: The common butterfly valve and gate valve with the same nominal pressure and nominal diameter are more rigorous and not easy to leak water.

       The sealing of the gate valve is better than the butterfly valve, but there are also manufacturers of butterfly valve sealing performance is good.

       The gate valve is bulky and takes up a lot of space.

       The butterfly valve is small and takes up little space.

       When choosing the specific, also consider the temperature of the medium, the sealing and packing of the valve.

       The specification specifies disc valves with a nominal diameter greater than 50.

       Butter welded butterfly valve is a key new product. The high performance manual butterfly valve adopts a double eccentricity and a special oblique cone elliptical seal structure. Solve the traditional eccentric butterfly valve in the opening and closing 0 ° ~ 10 ° instant sealing surface friction is still in the shortcomings of friction, to achieve the butterfly plate in the open instant sealing surface that is separated, close the contact that is the effect of sealing, to extend the service life, sealing performance comparison Good purpose.


        For the sulfuric acid industry gas pipeline: furnace front fan inlet and outlet, relay fan inlet and outlet, electric defogging series and connection valve, S02 main blower inlet and outlet, converter adjustment, preheater inlet and outlet adjustment and cut-off gas usage.

        The sulphur-burning, conversion and dry-sucking sections used in the sulphur-burning sulphuric acid plant are relatively good brands of sulphur-burning sulphuric acid plant valves and are considered by the majority of users as having good sealing performance, light operation, secondary corrosion, high temperature resistance, and operation. Convenient, flexible, and safe and reliable butterfly valves have been widely used.

        Also used for: SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, etc. in the chemical, petrochemical, smelting, pharmaceutical, food, and other industries. The medium is used as a regulating and shut-off device on the pipeline.

        Structural features

        1 The unique design of three-way eccentricity enables frictionless transmission between the sealing surfaces, extending the service life of the valve.

        2 elastically sealed by torque.

        3 Ingenious wedge design makes the valve more tight and automatic sealing function, sealing surface between the compensation, zero leakage.

        4 small size, light weight, lightweight operation, easy installation.

        5 According to user requirements, pneumatic and electric devices can be configured to meet the needs of remote control and program control.

        6 Replacement parts Materials can be applied to various media, and can be lining anti-corrosion (lining F46, GXPP, PO, etc.).

        7 Diversified continuous structures: clips, flanges, butt welds

Related Industry Knowledge

Learn More Information About Our Products Know More
Copyright © Shanghai KS Flow Control Equipments Co.,Ltd All Rights Reserved.