a dome valve

Abstract

The invention discloses a dome valve. The dome valve comprises a valve body, a sealing pad, a ball dome and a cylinder, and further comprises a main sealing ring and a top plate assembly; the top plate assembly comprises a top plate, an annular piston and a piston work doing pipe; the piston work doing pipe drives the main sealing ring to move downwards, finally the main sealing ring is tightly attached to the upper ball face of the ball dome to achieve sealing, and therefore the sealing principle of inflating expanding sealing of an existing expansible sealing ring is changed, a gap between the main sealing ring and the ball dome can be made far larger than the upper limit of the particle size of material particles conveyed by a pneumatic conveying system, material particles left in the dome valve cannot be stuck at the position of the gap between the main sealing ring and the ball dome, and therefore the problem that the sealing ring in the dome valve can be abraded easily is solved from the aspect of the external cause causing abrasion of the existing expansible sealing ring, and the service life of the sealing ring in the dome valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of pneumatic conveying, in particular to a dome valve. Background technique [0002] The dome valve is a valve widely used in pneumatic conveying systems. It can cut off the flowing material flow or static material column entering the pressure tank, and then close to achieve a seal, so as to ensure that the filling rate of the pressure tank is 100% without relying on The level gauge of the sending tank, so the control principle is simple and reliable. When handling abrasive materials, the expandable sealing ring embedded in the dome valve seat ensures the working pressure difference between the front and back of the valve. [0003] At present, the structure of the dome valve in the prior art includes a valve body, an expandable sealing ring, a top plate, a ball top, and a power unit. The expandable sealing ring is fixed on the top plate through an upper support ring and a lower support ring, and the top pla...

AI Technical Summary

Problems solved by technology

[0006] However, even if the flapper valve is set, after the flapper valve cuts off the material flow, there will inevitably always be a small amount of material particles scattered on the dome valve, and then most of these material particles will be lost under their own weight and / Or the displacement of the ball top under dynamic forces such as rotation, and finally stuck in the gap between the expandable sealing ring and the ball top, over time, more and more material particles stuck here, and as time goes by, the The expandable sealing ring wears out gradually, causing the expandable sealing ring to be worn out frequently, which seriously shortens the service life of the expandable sealing ring. After the expandable sealing ring is worn out, it must be stopped and replaced in time, which also causes the entire pneumatic conveying system to frequently Downtime, affecting production

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