CN220134639U - Self-pressure-releasing stop valve - Google Patents

Abstract

The utility model relates to the technical field of stop valves, in particular to a self-pressure-relieving stop valve, which adopts a double-valve-clack combination mode, a large valve clack is in direct contact with a valve body, a hard alloy surface of a valve body is in surface-overlaying direct contact with an outer hard alloy surface of the large valve clack to form surface seal, the lower surface of a small valve clack is in surface-overlaying direct contact with an inner surface of the large valve clack to form second road surface seal, the upper surface of a round cushion block is in direct contact with the bottom surface of a valve rod, hard alloy is in surface-overlaying on the bottom conical surface of the valve rod, hard alloy is in surface-overlaying on the inner surface of the small valve clack, and a spring is connected with the round cushion block and the small valve clack. The triple sealing mode of the utility model adopts the double valve clack mode, which can reduce the damage to the spring under the high pressure condition, increase the adjusting sensitivity and the service life, build-up welding hard alloy on the conical surface at the bottom of the valve rod and the conical surface on the inner surface of the small valve clack, if the spring fails, the forced sealing can be realized, the safety coefficient is higher, the cushion block and the spring are only needed to be replaced in the subsequent maintenance, and if the pressure is not needed to be relieved, the valve can be directly used as a common stop valve, and the triple sealing valve is more economical.

Description

Self-pressure-releasing stop valve

Technical Field

The utility model relates to a stop valve, in particular to a stop valve capable of automatically relieving pressure.

Background

The stop valve is composed of valve body, valve seat, valve rod, valve clack, valve cover and driver. The utility model patent of China with the publication number of CN115750905A provides a stop valve, a liquid inlet pipe and a liquid outlet pipe are arranged on a valve body, a valve cavity is arranged in the valve body, an overhaul port communicated with the valve cavity is arranged on the valve body, an overhaul cover is arranged on the overhaul port in a rotating and sealing manner, a sealing cavity is also arranged in the valve cavity, a valve port communicated with the liquid inlet pipe and the liquid outlet pipe is arranged in the sealing cavity, a valve rod is arranged on the valve body, one end of the valve rod in the valve body is rotationally connected with a valve core disc, the valve core disc is in sliding connection with the sealing cavity and is in sealing connection with the connecting part, a plurality of vertical grooves are arranged on the valve core disc, a valve core is elastically connected in the vertical grooves, a switching piece for controlling the valve core disc to rotate is connected with the valve rod, and the valve core disc and the sealing cavity are conveniently switched over when the valve is in an open state, and the valve core is damaged, so that the production efficiency is prevented from being influenced by the operation of a pipeline.

In the prior art, the stop valve generally adopts valve rod acting force to realize forced sealing, does not have a pressure relief function, and requires the stop valve to realize a self-pressure relief function after being larger than a certain pressure under the existing partial working conditions, so that a novel stop valve is needed to realize the function.

Disclosure of Invention

The utility model aims to provide a self-pressure-releasing stop valve which is simple in structure, can realize the self-pressure-releasing function when the stop valve is larger than a certain pressure under partial working conditions, and can be directly used as a common stop valve when pressure release is not needed.

In order to achieve the above purpose, the present utility model adopts the following technical scheme.

The utility model relates to a self-pressure-relieving stop valve, which comprises a valve body, a valve rod and a valve clack; the valve clack is a combined valve clack, the combined valve clack is a double-valve clack combination of a large valve clack and a small valve clack, the large valve clack is in direct contact with the valve body, the hard alloy surface of the valve body subjected to surfacing welding is in direct contact with the hard alloy surface outside the large valve clack to form surface seal, and the lower surface of the small valve clack is in contact with the hard alloy surface of the inner surface of the large valve clack to form second road surface seal.

Preferably, the valve further comprises a valve clack gland, a spring and a round cushion block, wherein the spring and the round cushion block are arranged in the combined valve clack.

In any of the above embodiments, preferably, the upper surface of the circular pad is in direct contact with the bottom surface of the valve stem.

In any of the above technical solutions, it is preferable that the conical surface of the bottom of the valve rod is overlaid with cemented carbide.

In any of the above embodiments, it is preferable that the clack inner surface cone surface is hard-coated.

In any of the above technical solutions, preferably, the spring connects the circular pad and the small valve clack.

According to the technical scheme, the valve clack is a double-valve clack combination, the large valve clack is in direct contact with the valve body, the hard alloy surface of the valve body is in surface seal by being in surface seal with the hard alloy surface of the outer surface of the large valve clack, the lower surface of the small valve clack is in surface seal with the hard alloy surface of the inner surface of the large valve clack by being in surface seal with the second road surface, the upper surface of the round cushion block is in direct contact with the bottom surface of the valve rod, the hard alloy is in surface seal with the conical surface of the inner surface of the small valve clack by being in surface seal with the hard alloy surface of the inner surface of the small valve clack by being in surface seal with the conical surface of the inner surface of the small valve clack, and the round cushion block and the small valve clack are connected through the spring.

Compared with the prior art, the stop valve is designed into a triple sealing mode, damage to the spring under the condition of high pressure can be reduced by adopting a double-valve-clack mode, the adjusting sensitivity and the service life are increased, hard alloy is deposited on the conical surfaces at the bottom of the valve rod and the inner surface of the small valve clack, forced sealing can be realized if the spring fails, the safety coefficient is higher, a cushion block and the spring are only required to be replaced in subsequent maintenance, and the stop valve can be directly used as a common stop valve if a pressure relief function is not required, and is more economical.

The utility model has the advantages that the self-pressure-releasing function can be realized, and the valve can also be used as a common stop valve.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic view of a preferred embodiment of a self-venting shut-off valve in accordance with the present utility model.

Reference numerals: 1. valve body, 2, big valve clack, 3, little valve clack, 4, spring, 5, circular cushion, 6, valve clack gland, 7, valve rod, L, flow direction.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The scope of the utility model is not limited by the specific embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Aiming at the problems existing in the prior art, the embodiment of the utility model provides the stop valve capable of automatically relieving pressure, which can realize the function of automatically relieving pressure when the stop valve is larger than a certain pressure under partial working conditions, and can be directly used as a common stop valve when pressure relieving is not needed.

The structure, technical features and application of the stop valve according to the present embodiment are described below with reference to fig. 1.

The self-pressure-relieving stop valve mainly comprises a valve body 1, a valve rod 7 and a valve clack, wherein the valve clack is a combined valve clack, and the combined valve clack is a double-valve clack combination of a large valve clack 2 and a small valve clack 3. As shown in fig. 1, the large valve clack 2 is in direct contact with the valve body 1, the hard alloy surface of the valve body 1 is in direct contact with the hard alloy surface outside the large valve clack 2 to form a surface seal, and the lower surface of the small valve clack 3 is in contact with the hard alloy surface inside the large valve clack 2 to form a second road surface seal.

As shown in fig. 1, the stop valve of this embodiment further comprises a flap gland 6, a spring 4 and a circular spacer 5 which are installed in the combined flap, and the upper surface of the circular spacer 5 is in direct contact with the bottom surface of the valve rod 7.

In this embodiment, the bottom conical surface of the valve rod 7 is welded with hard alloy in a overlaying manner.

In this embodiment, the inner surface of the small valve clack 3 is made of hard alloy by conical surface surfacing.

In this embodiment, the spring 4 connects the circular pad 5 and the small valve clack 3.

The self-pressure-relieving stop valve of the embodiment adopts a double-valve-clack combination mode, a large valve clack is in direct contact with a valve body, a hard alloy surface for valve body surfacing is in direct contact with an outer hard alloy surface of the large valve clack to form surface seal, the lower surface of a small valve clack is in contact with an inner hard alloy surface for large valve clack surfacing to form second road surface seal, the upper surface of a round cushion block is in direct contact with the bottom surface of a valve rod, the conical surface of the bottom of the valve rod is surfacing hard alloy, the conical surface of the inner surface of the small valve clack is surfacing hard alloy, and the round cushion block and the small valve clack are connected through a spring. According to the embodiment, the stop valve is designed into a triple sealing mode, damage to the spring under the condition of high pressure can be reduced by adopting a double-valve-clack mode, the adjusting sensitivity and the service life are increased, hard alloy is deposited on the conical surfaces at the bottom of the valve rod and the inner surface of the small valve clack, forced sealing can be realized if the spring fails, the safety coefficient is higher, the cushion block and the spring are only required to be replaced in subsequent maintenance, and the valve can be directly used as a common stop valve if a pressure relief function is not required, so that the valve is more economical.

In an implementation, a shut-off valve as shown in fig. 1 is employed, comprising: the valve body 1, the big valve clack 2, the little valve clack 3, the spring 4, circular cushion 5, big valve clack 2 and valve body 1 direct contact, the hard alloy face of valve body 1 build-up welding forms face seal with the external hard alloy face direct contact of big valve clack 2, the second way face seal of little valve clack 3 lower surface and the internal surface build-up welding hard alloy face contact of big valve clack 2, the conical surface of valve rod 7 bottom and the internal surface build-up welding hard alloy of little valve clack 3 can contact and form the third way face seal, adopt big valve clack combination multiplicable leakproofness and life, reducible damage to the spring. In practical application, the compression amount of the spring can be adjusted by adjusting the stroke of the valve rod, so that the acting force applied by the spring on the small valve clack is adjusted to realize sealing, when the acting force of the medium pressure at the sealing surface is larger than the elastic force of the spring, the sealing cannot be realized, and the small valve clack can be loosened to realize the pressure relief function. The stroke can also be directly regulated to enable the valve rod to be in direct contact with the small valve clack so as to realize forced sealing. Thus, the self-pressure relief and forced sealing effects are achieved.

The foregoing description of the preferred embodiments of the utility model is merely illustrative of the utility model and is not intended to limit the scope of the utility model; the foregoing is merely illustrative of the present utility model and is not intended to limit the scope of the present utility model; any modification, equivalent replacement, improvement or the like of the technical scheme of the present utility model by those skilled in the art should fall within the protection scope of the present utility model as defined in the claims without departing from the design spirit of the present utility model.

Claims (5)

1. The utility model provides a but from pressure release stop valve, includes valve body (1), valve rod (7) and valve clack, its characterized in that: the valve clack is a combined valve clack, the combined valve clack is a double valve clack combination of a large valve clack (2) and a small valve clack (3), the large valve clack (2) is in direct contact with the valve body (1), the hard alloy surface of the valve body (1) is in direct contact with the hard alloy surface outside the large valve clack (2) to form surface seal, and the lower surface of the small valve clack (3) is in contact with the hard alloy surface inside the large valve clack (2) to form second road surface seal; the self-pressure-relieving stop valve also comprises a valve clack gland (6), a spring (4) and a round cushion block (5), wherein the spring (4) and the round cushion block are arranged in the combined valve clack.

2. The self-venting shut-off valve of claim 1, wherein: the upper surface of the round cushion block (5) is in direct contact with the bottom surface of the valve rod (7).

3. The self-venting shut-off valve of claim 1, wherein: and hard alloy is deposited on the conical surface of the bottom of the valve rod (7).

4. The self-venting shut-off valve of claim 1, wherein: and hard alloy is deposited on the inner surface conical surface of the small valve clack (3).

5. The self-venting shut-off valve of claim 1, wherein: the spring (4) is connected with the round cushion block (5) and the small valve clack (3).