After more than 20 years of development and accumulation, the company has become a comprehensive modern enterprise integrating product research and development, manufacturing, sales and service, and has established a highly skilled valve product research and development and professional production team. The company is certified by the National Pressure Pipeline TS. The company's leading products are metal hard seal soft sealing butterfly valve, two-way pressure butterfly valve, high pressure sealing butterfly valve, telescopic butterfly valve, special butterfly valve for water supply and drainage, vacuum butterfly valve, ventilation butterfly valve and so on. Products are used in electric power, petroleum, chemical, metallurgy, shipbuilding, food, medical equipment and urban water supply and drainage.
The structure of the two-way pressure butterfly valve is mainly composed of a lower wedge shaft, a valve body, a butterfly plate, a valve stem, an upper wedge shaft, a packing, a valve cover, a packing gland and a guiding block. The working principle is that, in the open state, the valve stem rotates to the right, and the guide block guides the valve stem to drive the butterfly plate to rotate to the right by 90°, so that the sealing surface of the butterfly plate and the sealing surface of the valve body are in parallel position, the valve stem continues to rotate rightward, and the guiding block Guide the valve stem to move downward, push the upper and lower wedges, so that the wedge wedge surface pushes the butterfly plate and the valve body sealing surface to contact, the butterfly valve closes to achieve sealing; in the closed state, the valve stem is left-handed, and the guiding block guides the valve stem to move upward Pushing the upper and lower wedges to move upwards, the wedge wedge surface drives the butterfly plate to translate, the butterfly sealing surface and the valve body sealing surface are separated, and after the butterfly plate moves a certain eccentric distance, the valve stem continues to rotate left, and the guiding block guides the valve stem Rotate and drive the disc to rotate 90° to the left, and the butterfly valve opens. Since the disc rotates at a certain distance from the sealing surface of the valve body, the disc does not interfere with the sealing surface of the valve body when it is opened and closed.
The thrust of the wedge block provided on the upper and lower parts of the valve stem of the two-way pressure butterfly valve can overcome the pressure of the reverse flow of the medium, so that the butterfly valve can achieve a reliable sealing under the condition of two-way flow of the medium. A wedge-shaped dovetail tip is arranged on the butterfly plate, and the valve stem performs the upper and lower movements to drive the wedge block movement, and the wedge block displacement applies a sealing force to the sealing surface of the butterfly plate, thereby improving the sealing performance of the two-way pressure butterfly valve and at the same time compensating for the wear of the sealing pair. Improve the reliability of metal sealing butterfly valves.
The wedge surface of the wedge block pushes the butterfly plate to reciprocate linear motion in the wedge-shaped dovetail groove of the butterfly plate, so that the butterfly plate contacts or leaves the sealing surface of the valve body, thereby reducing the abrasion of the sealing surface. The butterfly plate moves linearly and then rotates, which extends the opening and closing time of the butterfly valve and reduces the hydraulic torque of the butterfly valve. Both the sealing surface of the disc and the sealing surface of the valve body are tapered, the sealing is reliable, and the design and processing are simple.
Learn more about two-way pressure butterfly valves or other butterfly valve phantom access:
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