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

Abstract

The invention provides a high-temperature and high-pressure instrument one-way self-locking valve 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 joint position of the valve body and the valve cover, bypasses are arranged on the valve body and the valve cover, and a cavity between the metal diaphragm and the valve cover is 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 invention patent relates to the field of instrument valves, specifically a high-temperature and high-pressure instrument one-way self-locking valve. Background Art

[0002] In the one-way structure of the instrument valve, the unique lifting structure provides very effective help for the sealing of the one-way valve, but the current structure is similar. Due to its simple structure, the automatic return function of the valve disc of the one-way valve plus the return by the medium force can achieve good sealing ability, but it is precisely this automatic return function of the valve disc that causes the valve disc to fluctuate up and down when the flow or pressure of the valve decreases, causing the flow of the medium to fluctuate. Summary of the invention

[0003] In view of the shortcomings of the prior art, the patent of the present invention 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 with the outlet end channel, and the outer periphery of the stepped abutment between the valve body and the valve cover is abutted against each other with a toothed structure.

[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 in an outer arc shape when the valve is opened. Beneficial Effects

[0006] 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 too much 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

[0007] Figure 1 This is a schematic diagram of the patent structure of the present invention; Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0008] In the figure: 1. Valve body; 2. Valve disc; 3. Metal diaphragm; 4. Valve cover; 5. Bypass. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the patent of the present invention to clearly and completely describe the technical solutions in the embodiments of the patent of the present invention. Obviously, the described embodiments are only part of the embodiments of the patent of the present invention, not all of them. Based on the embodiments in the patent of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the patent of the present invention.

[0010] See also Figure 1-2 This structure includes a valve body, a valve disc, a metal diaphragm, and a valve cover, without non-metallic sealing parts. The valve disc moves up and down in the guide groove of the valve body. An arc-shaped metal diaphragm is arranged on the upper part of the valve disc. The arc-shaped metal diaphragm and the valve disc are fixed by set screws. The edge of the diaphragm is sealed with a stepped sealing surface to form multiple sealing belts, which ensures reliable sealing.

[0011] When the medium pressure acts on the valve disc from the inlet side, the arc-shaped diaphragm moves upward under the action of the medium force, causing the diaphragm to change from an inner arc to an outer arc. The arc-shaped diaphragm locks the valve disc in an 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 reverse direction, the reverse medium force will cause the valve disc to generate a force to return to the seat. In addition, a bypass is opened 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 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 return to the seat seal.

[0012] 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 external multiple sealing belts can still achieve sealing.

[0013] 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 high-temperature and high-pressure instrument one-way self-locking valve, comprising a valve body, a valve disc, and a valve cover, characterized in that: 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 of the valve body and the valve cover. A bypass is arranged on the valve body and the valve cover, so that the cavity between the metal diaphragm and the valve cover is connected with the outlet end channel, and the outer periphery of the stepped abutment of the valve body and the valve cover cooperates with each other in a toothed structure.

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.

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