Product Introduction
The driving mode of the lug butterfly valve can be manual, worm gear, or pneumatic. The connection mode can be flange or wafer. The structure can be single eccentric, center line, double eccentric, and triple eccentric. The sealing structure can choose soft seal or hard seal. The pressure range is PN0.1-10Mpa, the nominal diameter is DN40~800mm, and the material can be cast steel or stainless steel. Due to the wide range of use of valves, the same valve has different combinations in different occasions and working conditions.
The butterfly plate of the wafer lug 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 in a fully open state.
The wafer butterfly valve is connected between two pipe flanges with stud bolts. Its structure is simple, small in size, light in weight, and only composed of a few parts.
Scope of application
Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems of thermal power stations.
Used in the gas pipeline in the sulfuric acid industry: the inlet and outlet of the blower in front of the furnace, the inlet and outlet of the relay fan, the electric demisting series and the connection valve, the inlet and outlet of the S02 main blower, the adjustment of the converter, the inlet and outlet of the preheater, etc. and the use of cut-off gas.
It is used in the sulfur burning, conversion and dry absorption sections of the sulfur burning sulphuric acid plant. It is the preferred brand of valves for the sulphur burning sulphuric acid plant. It is regarded by the majority of users as: good sealing performance, light operation, secondary corrosion, high temperature resistance, convenient operation, The flexible, safe and reliable butterfly valve has been widely promoted and used.
Lug butterfly valves are also widely used in: SO2, steam, air, gas, ammonia, CO2, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid in chemical, petrochemical, smelting, pharmaceutical, food and other industries , Sulfuric acid, phosphoric acid and other medium pipelines are used as regulating and shut-off devices.
Structural features:
1The unique design of three-way eccentricity enables frictionless transmission between the sealing surfaces and prolongs the service life of the valve.
2 Elastic seal is produced by torque.
3The clever wedge-shaped design makes the valve have the function of automatic sealing as the valve closes tighter and tighter, and the sealing surfaces are compensated and leak free.
4Small size, light weight, light operation and easy installation.
5Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.
6:The material of replacement parts can be applied to various media, and can be lining anti-corrosion (lining F46, GXPP, PO, etc.).
Comparison of performance between wafer butterfly valve and gate valve. Compared with ordinary butterfly valves with the same nominal pressure and nominal diameter, the airtightness of the gate valve is better than that of the butterfly valve.
The gate valve is large in size and takes up a lot of space.
The butterfly valve is small in size and takes up little space.
When selecting, the temperature of the medium, the sealing of the valve and the packing must also be considered.
The specification stipulates that butterfly valves with a nominal diameter greater than 50 are used.
The high-performance manual wafer butterfly valve adopts a double eccentric and a special oblique cone oval sealing structure. It solves the shortcoming of the traditional eccentric butterfly valve that the sealing surface is still in sliding contact friction at the moment of opening and closing 0°~10°, and realizes that the sealing surface of the butterfly plate separates at the moment of opening, and the effect of closing the contact is sealing, so as to extend the service life and maximize the sealing performance. Good purpose.
Standard Specification:
Design and manufacturing standards: GB/T 12238-2008, ANSI B16.34, API609, MSS SP-68, JIS B2032, JIS B2064
Structure length standard: GB/T 12221-2005, API609, JIS B2002
Connecting flange standards: GB/T 9113, JB79, SH3406, HG20592, ASME B16.5, ASME B16.47, API605, JIS B2212
Pressure temperature rating: GB/T 12224-2005
Test and inspection standards: GB/T 13927-2008, API598, JIS B2003
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