CN206386525U - A kind of preferable natural gas check-valves of valve sealing - Google Patents

Abstract

The utility model relates to a check valve, in particular to a natural gas check valve with good sealing performance, which comprises a valve body and a valve clack arranged inside the valve body, a channel cavity is arranged in the valve body, and the channel The cavity includes a valve disc movement cavity and a pipe cavity connected with the valve disc movement cavity. A hinge shaft groove, the valve disc hinge shaft is provided with a valve disc hinge shaft, and the valve disc is connected to the valve disc under the valve disc hinge shaft. There is an O-ring seal in the circumferential dovetail groove. Due to the design of the O-ring seal, the sealing performance is good when the valve disc and the O-ring are close together. The circumferential dovetail groove will be able to block the O-ring. To ensure that when the placement angle is not absolutely vertical, the O-ring will not slip out or shift, so as to ensure the sealing effect.

Description

A natural gas check valve with better sealing performance

technical field

The utility model relates to a check valve, in particular to a natural gas check valve with better valve sealing performance.

Background technique

Check valves are automatic valves, mainly used in pipelines with one-way flow of medium, only allowing the medium to flow in one direction, preventing the medium in the pipeline from flowing backwards, and avoiding accidents. Usually, the fluid opens the valve disc of the valve under the action of pressure, and flows from the inlet side to the outlet side; when the pressure on the inlet side is lower than the outlet side, the valve disc automatically closes the channel under the action of fluid pressure and its own gravity, preventing Fluid backflow. However, in the natural gas transmission pipeline, the pressure inside the pipeline is low, and the valve disc is thick and heavy, so it is likely that the valve disc cannot be pushed to close the valve. If the weight of the valve disc is reduced simply by reducing the thickness of the valve disc, the hard seal will be incomplete because the valve disc is too thin, causing gas backflow.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a natural gas check valve with better valve sealing performance.

The utility model is realized through the following technical solutions:

A natural gas check valve with better valve sealing performance, comprising a valve body and a valve disc arranged inside the valve body, the valve body is provided with a passage cavity, and the passage cavity includes a valve disc movement cavity and a valve disc movement cavity Unicom pipeline cavity, a stepped platform is provided between the valve disc movement cavity and the pipeline cavity, and a valve disc hinge shaft groove is arranged on the upper side of the valve disc movement cavity close to the pipeline cavity, and the valve disc hinge shaft groove A hinged shaft for the valve disc is provided, the valve disc is connected under the hinged shaft for the valve disc, a circumferential dovetail groove is provided on the surface of the stepped platform adjacent to the valve disc, and an O-ring is provided in the circumferential dovetail groove.

The inner edge of the valve disc is provided with a circumferential sealing gasket.

The beneficial effects of the utility model are:

Due to the design of the O-ring sealing ring, the sealing performance is good when the disc and the O-ring are in close contact, and the circumferential dovetail groove will be able to clamp the O-ring to ensure that when the placement angle is not absolutely vertical, the O The type seal ring will not slip out or shift, thus ensuring the sealing effect. The sealing gasket on the inner edge of the disc can be closely matched with the O-ring to improve the sealing effect.

Description of drawings

Fig. 1 is a front structural schematic view of the utility model.

In the figure: 1. valve body, 2. valve disc, 3. valve disc movement cavity, 4. pipe cavity, 5. step platform, 6. valve disc hinge shaft groove, 7. valve disc hinge shaft, 8. circumferential dovetail Groove, 9. O-ring seal.

detailed description

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

As shown in the figure, the utility model includes a valve body 1 and a valve clack 2 arranged inside the valve body. The valve body is provided with a channel cavity, and the channel cavity includes a valve clack movement cavity 3 and a valve disc communicating with the valve clack movement cavity. Pipe cavity 4, a step platform 5 is provided between the valve disc movement cavity and the pipeline cavity, and a disc hinge shaft groove 6 is arranged on the upper side of the valve disc movement cavity close to the pipeline cavity, and the valve disc hinge shaft groove There is a disc hinged shaft 7 inside, the disc hinged shaft is connected to the valve disc, and the surface of the stepped platform adjacent to the valve disc is provided with a circumferential dovetail groove 8, and an O-shaped seal is provided in the circumferential dovetail groove. Circle 9. The inner edge of the valve disc is provided with a circumferential sealing gasket.

The utility model can be equipped with a thin valve flap to adapt to the pressure in the pipeline with a small pressure. The design of the O-shaped sealing ring makes the sealing performance good when the valve flap and the O-shaped sealing ring are in close contact, and the dovetail groove around the circumference will be able to Clamp the O-ring to ensure that the O-ring will not slip out or shift when the placement angle is not absolutely vertical, so as to ensure the sealing effect. The sealing gasket on the inner edge of the disc can be closely matched with the O-ring to improve the sealing effect.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (2)

1. a kind of preferable natural gas check-valves of valve sealing, it is characterised in that the flap including valve body and on the inside of valve body, Channel lumens are provided with the valve body, the channel lumens include the duct chamber that flap moves chamber and chamber UNICOM is moved with flap, described Flap moves and ladder platform is provided between chamber and duct chamber, and the abutting for flap motion chamber is provided with flap hinge on the upside of duct chamber It is provided with groove, the flap hinge groove under flap twisted axis, the flap twisted axis and connects flap, the ladder platform closes on the face of flap Provided with all dovetail grooves of ring, O-ring seal is provided with all dovetail grooves of the ring.

2. according to a kind of preferable natural gas check-valves of valve sealing of claim 1, it is characterised in that the flap inner edge is provided with The all sealing gaskets of ring.