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A technology of flat gate valve and soft seal, which is applied in the direction of sliding valve, valve detail, valve device, etc., can solve the problems such as no patent documents have been found, and achieve the effect of simple structure, flexible valve control, and low sealing specific pressure
Inactive Publication Date: 2013-11-27
TIANJIN BAILIZHANFA GRP
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[0004] After searching, no patent documents identical to this patent application were found
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[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0019] A double soft-seal flat gate valve, including a valve body 1, a valve cover 6, a gasket 5, a valve stem 4, a packing pressure plate 11, a gate plate 2, a bracket 8 and a valve seat 3, as attached figure 1 As shown, the medium flow channel is coaxially formed in the valve body horizontally, a bonnet is fixed coaxially on the upper end of the valve body, and a sealing gasket is coaxially pressed between the valve body and the bonnet; There is a packing plate coaxially set between the valve stem and the valve cover, and the valve stem can be flexibly rotated and lifted in the valve cover; a stuffing box 12 is coaxially pressed between the valve stem and the valve cover at the lower end of the pack...
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Abstract
The invention relates to a dual soft sealing flat gate valve. The dual soft sealing flat gate valve comprises a valve body, a valve cover, a sealing gasket, a valve rod, a padding pressing plate, a gland box, a flashboard and valve seats. A medium passage is transversely and coaxially formed inside the valve body, the valve cover is longitudinally, coaxially and fixedly installed at the upper end of the valve body, the valve rod is longitudinally and coaxially installed in the middle of the valve cover, the gland box is coaxially installed between the valve cover and the valve rod at the lower end of the padding pressing plate in a pressing mode, the lower end of the valve rod stretches into the valve body, the flashboard is longitudinally, coaxially and fixedly installed at the lower end of the valve rod, the two parts, located on the two transverse sides of the flashboard, of the valve body are internally provided with the valve seats respectively and symmetrically in a pressing mode, two rectangular grooves are longitudinally formed in the valve seat contact face connected with the flashboard at intervals, an RPTFE rectangular sealing ring is embedded inside one rectangular groove close to the medium passage, and a rectangular rubber ring is installed inside the other rectangular groove. The dual soft sealing flat gate valve is simple in structure, scientific in design, reliable in sealing, easy to machine, low in sealing specific pressure, flexible in operation, long in service life and high in sealing reliability, torque is reduced, and the sealing performance is improved.
Description
technical field [0001] The invention belongs to the field of valves, and relates to a flat gate valve, in particular to a double soft-sealed flat gate valve. Background technique [0002] At present, only one RPTFE rectangular sealing ring is designed on the valve seat of the slab gate valve. Due to the high sealing specific pressure of RPTFE, more springs need to be installed at low pressure to meet the sealing requirements before the valve, thus increasing the pressure. Switching torque. However, if rubber material is used as the seal, when the medium contains impurities, it is easy to scratch the soft sealing surface, and the damage of the sealing structure will lead to a short service life of the valve, especially in the gas medium, it is difficult to achieve a zero-leakage sealing level. [0003] RPTFE material, polytetrafluoroethylene glass fiber, has the best chemical corrosion resistance and dielectric properties among known plastics, and can be used in the temperat...
Claims
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Application Information
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