CN210950074U - Multi-working-condition safety valve - Google Patents

Abstract

The utility model relates to a multi-working condition safety valve, which comprises a valve body, a valve seat, a valve clack, a valve cover and a pressure setting device; the method is characterized in that: a first-stage pressure relief safety valve is arranged at the center of the inner side of the sealing surface of the valve clack; when the inlet pressure of the valve body exceeds the setting pressure value of the first-stage pressure relief safety valve, the pressure relief valve clack opens the discharge pressure; when the pressure rising speed of the container or the pipeline system is higher than the pressure discharge speed of the first-stage pressure relief safety valve, the inlet pressure of the valve body continues to rise to push the valve clack to open, the control pressure is within the safety range of the pressure container or the pipeline system equipment, the equipment is protected to be safe, and the safety protection performance is reliable.

Description

Multi-working-condition safety valve

Technical Field

The utility model belongs to the valve field, concretely relates to relief valve. The utility model is suitable for a pressure vessel or pipe-line system that the speed of stepping up is fast.

Background

The safety valve is a device for protecting the safety of a pressure container or pipeline equipment, the spring type safety valve is a common one, and the spring type safety valve structurally comprises a valve body, a valve seat, a valve clack, a valve cover and a spring pressure setting device. However, if the relief valve is too large in displacement to open the relief pressure, it can cause frequency jumps and chattering, and too small in displacement, it can cause overpressure accidents. Therefore, a plurality of safety valves with different setting pressures and discharge amounts can be arranged on a common pipeline or container according to different accidents (such as the failure of a power failure regulating valve caused by the fact that liquid and/or steam in a fire disaster flow into a heat exchange pipe and thermal expansion cooling water breaks), and the safety valves are large in installation quantity and high in cost.

Disclosure of Invention

The utility model aims at the problem that prior art exists, provide one kind and have two differences and set pressure, reduce system's relief valve installation quantity, reduce the multiplex condition relief valve of system's equipment cost.

The technical scheme of the utility model includes valve body, valve seat, valve clack, valve gap and pressure setting device, and valve seat fixed seal installs in the valve body import, fixed mounting uide bushing between valve body and valve gap, and valve clack lower extreme face and valve seat have the sealed face of mutually supporting, and the excircle face of the valve clack back and the interior wall clearance fit of uide bushing, and the valve seat export communicates with the valve body export, and the pressure setting device includes spring, ejector pin and setting nut; the method is characterized in that: a top disc is fixedly arranged on the back surface of the valve clack, the center of the upper end surface of the top disc is in top contact with the lower end of a mandril of the pressure setting device, a cavity is arranged between the lower end surface of the top disc and the back plane of the valve clack, and a first-stage pressure relief valve is arranged at the center of the inner side of the sealing surface of the valve clack; the first-stage pressure relief safety valve comprises a pressure relief valve clack, a pressure relief valve body, a pressure relief valve rod, a pressure relief spring and a pressure relief hole penetrating between a back plane and a lower end face of the valve clack, the upper end of the pressure relief valve body is fixedly arranged at the center of the lower end face of the valve clack, an inner cavity of the pressure relief valve body is communicated with the pressure relief hole, a through hole for communicating the pressure relief hole with an inlet of the valve body is formed in the side wall of the pressure relief valve body, the pressure relief valve clack is arranged at the upper end of the pressure relief hole, a sealing surface which is matched with each other is arranged between the lower end face of the pressure relief valve rod and the back plane of the valve clack, the; and a pressure relief channel is arranged between the cavity and the outlet of the valve body.

In the technical scheme, the setting pressure value of the pressure relief spring is smaller than that of the spring.

In the technical scheme, an axial through hole is formed between the upper end face and the lower end face of the top disc, and a radial through hole is formed in the circumferential side wall of the upper portion of the guide sleeve.

In the technical scheme, a thrust bearing is arranged between the lower end face of the setting nut and the upper end face of the upper spring seat at the upper end of the spring.

Compared with the prior art, the utility model beneficial effect be: a first-stage pressure relief safety valve is arranged at the center of the inner side of the sealing surface of the valve clack, and when the inlet pressure of the valve body exceeds the setting pressure value of the first-stage pressure relief safety valve, the pressure relief valve clack opens the discharge pressure; when the pressure rising speed of the container or the pipeline system is higher than the pressure discharge speed of the first-stage pressure relief safety valve, the inlet pressure of the valve body continues to rise to push the valve clack to open, the control pressure is within the safety range of the pressure container or the pipeline system equipment, the equipment is protected to be safe, the installation quantity of the system safety valves is reduced, and the installation cost of the system equipment is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. the hydraulic control valve comprises a valve body, 2, a valve seat, 3, a valve clack, 4, a recoil disc, 5, a guide sleeve, 6, a valve cover, 7, a spring, 8, an ejector rod, 9, a thrust bearing, 10, a setting nut, 11, a top disc, 12, a cavity, 13, a pressure relief valve clack, 14, a pressure relief hole, 15, a pressure relief valve rod, 16, a pressure relief valve body, 17, a pressure relief spring, 18, a spring seat, 19 and an adjusting nut.

Detailed Description

The multi-operating-condition safety valve as shown in figure 1 comprises a valve body 1, a valve seat 2, a valve clack 3, a valve cover 6 and a pressure setting device, wherein the valve seat 2 is fixedly and hermetically arranged at the inlet of the valve body 1, a guide sleeve 5 is fixedly arranged between the valve body 1 and the valve cover 6, the guide sleeve 5 is superposed with the central line of the valve seat 2, the lower part of the guide sleeve 5 extends into the inner cavity of the valve body 1, the lower end surface of the valve clack 3 and the valve seat 2 are provided with mutually matched sealing surfaces, the outer circular surface of the back surface of the valve clack 3 is in clearance fit with the inner circular wall of the guide sleeve 5, so that the valve clack 3 axially moves in the guide sleeve 5, a recoil disc 4 which can be axially adjusted is arranged on the outer circular surface of the lower part of the guide sleeve 5, the opening height of the valve clack 3 is controlled, the outlet of the valve seat 2, the upper end of the ejector rod 8 is movably sleeved in an inner hole of the setting nut 10, the setting nut 10 is installed in a screw hole in the upper end of the valve cover 6 through external threads, the lower end of the setting nut 10 is pressed against the upper end face of the upper spring seat, and the elastic force of the spring 7 is adjusted through adjusting the axial position of the setting nut 10 to set a setting pressure value; the method is characterized in that: a top disc 11 is fixedly arranged on the back surface of the valve clack 3, the center of the upper end surface of the top disc 11 is in top contact with the lower end of the ejector rod 8, a cavity 12 is formed between the lower end surface and the back plane of the valve clack 3, and a first-stage pressure relief valve is arranged at the center of the inner side of the sealing surface of the valve clack 3; the first-stage pressure relief safety valve comprises a pressure relief valve clack 13, a pressure relief valve body 16, a pressure relief valve rod 15, a pressure relief spring 17 and a pressure relief hole 14 penetrating between the back plane and the lower end face of the valve clack 3, the upper end of the pressure relief valve body 16 is fixedly arranged at the center of the lower end face of the valve clack 3, the inner cavity of the pressure relief valve body is communicated with the pressure relief hole 14, the side wall of the pressure relief valve body is provided with a through hole for communicating the pressure relief hole 14 with the inlet of the valve body 1, the pressure relief valve clack 13 is arranged at the upper end of the pressure relief hole 14, a mutually matched sealing surface is arranged between the lower end face and the back plane of the valve clack 3, the upper end of the pressure relief valve rod 15 is fixedly connected with the center of the lower end face of the pressure relief valve clack 13, the lower end, the axial position of the adjusting nut 19 on the pressure relief valve rod 15 is adjusted, the elastic force of the pressure relief spring 17 is adjusted, and the adjusting pressure value of the primary pressure relief safety valve is set; a pressure relief channel is arranged between the cavity 12 and the outlet of the valve body 1, so that when the pressure relief valve clack 13 is opened, the medium at the inlet of the valve body 1 is discharged to the outlet through the cavity 12.

The set pressure value of the pressure relief spring 17 is smaller than the set pressure value of the spring 7, the set pressure value of the pressure relief spring 17 is set as the rated pressure value of the pressure vessel or the pipeline system, and the set pressure value of the spring 7 is set as the safety limit pressure value of the pressure vessel or the pipeline system.

An axial through hole is formed between the upper end face and the lower end face of the top disc 11, a radial through hole is formed in the circumferential side wall of the upper portion of the guide sleeve 5, and the cavity 12 is communicated with an outlet of the valve body 1 through the axial through hole in the top disc 11 and the radial through hole in the guide sleeve 5.

A thrust bearing 9 is arranged between the lower end face of the setting nut 10 and the upper end face of the upper spring seat at the upper end of the spring 7, and the setting nut 10 is prevented from driving the spring 7 to rotate in the adjusting process.

Claims (4)

1. A multi-working-condition safety valve comprises a valve body (1), a valve seat (2), a valve clack (3), a valve cover (6) and a pressure setting device, wherein the valve seat (2) is fixedly and hermetically arranged at an inlet of the valve body (1), a guide sleeve (5) is fixedly arranged between the valve body (1) and the valve cover (6), the lower end face of the valve clack (3) and the valve seat (2) are provided with mutually matched sealing surfaces, the outer circular surface of the back of the valve clack (3) is in clearance fit with the inner circular wall of the guide sleeve (5), an outlet of the valve seat (2) is communicated with an outlet of the valve body (1), and the pressure setting device comprises a spring (7), an ejector rod (; the method is characterized in that: a top disc (11) is fixedly arranged on the back surface of the valve clack (3), the center of the upper end surface of the top disc (11) is in top contact with the lower end of the ejector rod (8), a cavity (12) is formed between the lower end surface and the back plane of the valve clack (3), and a primary pressure relief safety valve is arranged at the center of the inner side of a sealing surface of the valve clack (3); the first-stage pressure relief safety valve comprises a pressure relief valve clack (13), a pressure relief valve body (16), a pressure relief valve rod (15), a pressure relief spring (17) and a pressure relief hole (14) penetrating between the back plane and the lower end face of the valve clack (3), the upper end of the pressure relief valve body (16) is fixedly arranged at the center of the lower end face of the valve clack (3), the inner cavity of the pressure relief valve body is communicated with the pressure relief hole (14), the side wall of the pressure relief valve body is provided with a through hole for communicating the pressure relief hole (14) with the inlet of the valve body (1), the pressure relief valve clack (13) is arranged at the upper end of the pressure relief hole (14), a sealing surface which is mutually matched is arranged between the lower end face and the back plane of the valve clack (3), the upper end of the pressure relief valve rod (15) is fixedly connected with the center of the lower end face of the pressure relief, the spring seat (18) is arranged on the upper end surface of an adjusting nut (19) at the lower end of the pressure relief valve rod (15); and a pressure relief channel is arranged between the cavity (12) and the outlet of the valve body (1).

2. The multi-condition safety valve of claim 1, wherein: the setting pressure value of the pressure relief spring (17) is smaller than the setting pressure value of the spring (7).

3. A multi-condition safety valve according to claim 1 or claim 2, wherein: an axial through hole is arranged between the upper end surface and the lower end surface of the top disc (11), and a radial through hole is arranged on the circumferential side wall of the upper part of the guide sleeve (5).

4. A multi-condition safety valve according to claim 1 or claim 2, wherein: a thrust bearing (9) is arranged between the lower end face of the setting nut (10) and the upper end face of an upper spring seat at the upper end of the spring (7).

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