A piston type pressure relief sealing device

Abstract

The invention relates to a piston type pressure relief sealing device which comprises a tray. The tray is further provided with a pressure relief hole penetrating a tray body, the tray is installed on a valve shaft and can move along the axis of the valve shaft, the valve shaft is provided with a pressure relief groove, a seal ring is adjacent to the pressure relief groove, the sealing or opening is achieved by adjusting the position relations between the tray and the valve shaft, namely the sealing is achieved when the seal ring is higher than the position of the pressure relief hole, or else an opened state is achieved, and fluid achieves pressure relief through flowing after the communication of the pressure relief hole and the pressure relief groove. The piston type pressure relief sealing device can achieve graded sealing or opening of the fluid, the large torque caused by high pressure is reduced during the opening, the overall shaking caused by the impact on accessories caused by the high-pressure fluid is reduced; and the damage to the accessories caused by a water hammer formed due to the sudden change of the pressure is relieved during the closing.

Description

technical field [0001] The invention relates to a fire fighting equipment, in particular to a piston type pressure relief sealing device. Background technique [0002] At present, the cut-off fluid control device has a large torque when it is opened or closed under pressure, and the corresponding accessories require high strength, which increases the design and production costs; at the same time, due to the change of the fluid flow path during the opening or closing process , so that the impact of the fluid on the related accessories of the control device changes sharply, so that the control device shakes or even breaks. For example, in our daily life, sometimes when the faucet is turned on, the faucet will make a harsh sound and a slight vibration due to the high water pressure. Contents of the invention [0003] The object of the present invention is to solve the above technical problems and provide a piston type pressure relief sealing device. [0004] In order to ach...

AI Technical Summary

Problems solved by technology

[0002] At present, the cut-off fluid control device has a large torque when it is opened or closed under pressure, and the corresponding accessories require high strength, which increases the design and production costs; at the same time, due to the change of the fluid flow path during the opening or closing process , so that the impact of the fluid on the related accessories of the control device changes sharply, so that the control device shakes or even breaks

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