One-way self-locking valve of high-temperature and high-pressure instrument

Abstract

The utility model provides a one-way self-locking valve of a high-temperature and high-pressure instrument, which comprises a valve body, a valve clack and a valve cover, a metal diaphragm is arranged on the upper portion of the valve clack, the edge of the metal diaphragm is clamped in the step-shaped abutting position of the valve body and the valve cover, and a bypass is arranged on the valve body and the valve cover to enable a cavity between the metal diaphragm and the valve cover to be communicated with an outlet end channel. According to the technical scheme, the structure is simple, use under the high-temperature and high-pressure working conditions can be effectively achieved, due to the fact that no non-metal sealing piece is arranged, excessive regular sealing pieces are not needed, the on-site overhaul period is shortened, impact and vibration of the valve on the valve clack during medium flow and pressure fluctuation can be effectively reduced, the medium flowing stability is improved, and the service life of the valve is prolonged. And the service life of the valve clack is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of instrument valves, in particular to a one-way self-locking valve for high-temperature and high-pressure instruments. Background Art

[0002] The unique lifting mechanism of one-way instrument valves effectively aids in sealing, though the current structures are largely similar. Due to its structural simplicity, the automatic reseating function of the one-way valve disc, combined with the medium's force, allows for excellent sealing. However, this automatic reseating capability can cause the disc to fluctuate when flow or pressure decreases, leading to fluctuations in the medium's flow. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a one-way self-locking valve for high-temperature and high-pressure instruments, including a valve body, a valve disc, and a valve cover. A metal diaphragm is arranged on the upper part of the valve disc, and the edge of the metal diaphragm is clamped in the stepped abutment between the valve body and the valve cover. A bypass is provided on the valve body and the valve cover, so that the cavity between the metal diaphragm and the valve cover is connected to the outlet end channel.

[0004] Preferably, the metal diaphragm and the valve disc are fixed by means of set screws.

[0005] Preferably, the metal diaphragm is in an inner arc shape when the valve is closed, and is in an outer arc shape when the valve is open.

[0006] Preferably, the outer peripheries of the stepped abutment portions of the valve body and the valve cover are in abutment with each other in a toothed structure. Beneficial effects

[0007] This technical solution has a simple structure and can be effectively used under high temperature and high pressure conditions. Since it does not have non-metallic seals, there is no need for excessive regular replacement of seals, which reduces the on-site maintenance cycle. It can effectively reduce the impact and vibration of the valve disc when the medium flow and pressure fluctuate, improve the stability of the medium flow, and also increase the service life of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of the utility model;

[0009] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0010] In the figure: 1. Valve body; 2. Valve disc; 3. Metal diaphragm; 4. Valve cover; 5. Bypass. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] See Figure 1-2 This structure includes a valve body, a valve disc, a metal diaphragm, and a valve cover. There are no non-metallic seals. The valve disc moves up and down in the guide groove of the valve body. An arc-shaped metal diaphragm is set on the upper part of the valve disc. The arc-shaped metal diaphragm and the valve disc are fixed with set screws. The edge of the diaphragm is sealed with a stepped sealing surface to form multiple sealing belts, which are reliable in sealing.

[0013] When the medium pressure acts on the valve disc from the inlet side, the curved diaphragm moves upward under the action of the medium force, causing the diaphragm to change from an inner arc to an outer arc. The curved diaphragm thus locks the valve disc in the open state. Even if the medium force decreases, the valve disc will not drop, maintaining the stability of the medium flow. When the medium acts in the opposite direction, the reverse medium force will cause the valve disc to generate a force to return to its seat. In addition, a bypass is opened on the valve body and valve cover, so that the cavity between the metal diaphragm and the valve cover is connected to the outlet channel. When the inlet side loses pressure, the pressure on the outlet side will instantly create a pressure difference between the inside and outside of the metal diaphragm. The pressure in the cavity between the metal diaphragm and the valve cover will also cause the diaphragm to return from an outer arc to an inner arc, realizing the valve disc's return to seat seal.

[0014] In addition, a toothed sealing structure is provided on the valve body and the valve cover, which can effectively form multiple sealing belts. Even if the inner ring sealing belt is damaged and causes leakage, the multiple sealing belts on the outside can still achieve sealing.

[0015] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A one-way self-locking valve for high-temperature and high-pressure instruments, comprising a valve body, a valve disc, and a valve cover, characterized in that: A metal diaphragm is provided on the upper part of the valve disc, and the edge of the metal diaphragm is clamped in the stepped abutment between the valve body and the valve cover. A bypass is provided on the valve body and the valve cover to connect the cavity between the metal diaphragm and the valve cover with the outlet end channel.

2. A high-temperature and high-pressure instrument one-way self-locking valve according to claim 1, characterized in that , the metal diaphragm and the valve disc are fixed by set screws.

3. A high-temperature and high-pressure instrument one-way self-locking valve according to claim 1, characterized in that The metal diaphragm is in an inner arc shape when the valve is closed and in an outer arc shape when the valve is opened.

4. A high-temperature and high-pressure instrument one-way self-locking valve according to claim 1, characterized in that The outer peripheries of the stepped abutment portions of the valve body and the valve cover are in abutment with each other in a toothed structure.

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