CN214946642U - New pilot operated safety valve - Google Patents

Abstract

The utility model relates to a new guide's formula relief valve. The problems that an existing pilot operated safety valve is large in occupied space, a connecting pipe joint is prone to loosening and production cost is high are mainly solved. The method is characterized in that: a sliding valve (9), a pilot valve seat (10) and a pilot valve clack (11) are sequentially arranged in the main valve cover (4) from left to right, a pilot valve inlet (13) is communicated with a main valve inlet (5) through a lower guide pipe (15), a pilot valve cavity (12) is communicated with a back pressure cavity (17) of the main valve clack (3) through an internal channel (16) on the main valve cover (4), and a pilot valve outlet (14) is communicated with a main valve outlet (14) through an upper guide pipe (18). The utility model discloses the valve structure has been simplified to the pilot valve under the unchangeable condition of performance, has reduced the whole height of valve, compact structure, and occupation space is little, low in production cost has expanded the application range of valve, also can not make the not hard up production of coupling department of downcomer and last pipe reveal because of the pilot valve vibration.

Description

New pilot operated safety valve

Technical Field

The utility model relates to a valve, concretely relates to new guide's formula relief valve.

Background

The pilot operated safety valve is a non-direct load type safety valve, and is suitable for high-pressure and large-caliber occasions. The pilot safety valve mainly consists of a main valve (also called a mother valve) and a pilot valve (also called a sub valve), when the medium pressure is less than a set value, the system is in a normal operation state, a slide valve in a pilot valve cavity is in an opening state, the medium is transmitted into a backpressure chamber above a valve clack (piston) of the main valve from an inlet of the main valve through a lower guide pipe, the pilot valve cavity and an upper guide pipe, the medium pressure in the backpressure chamber is the same as the pressure medium at the inlet of the main valve, and at the moment, a sealing surface of the pilot valve is in a sealing state, so that the medium in the backpressure chamber above the main valve cannot be discharged from a pilot valve discharge port. Because the area difference exists in the pressed area of the upper and lower end faces of the main valve clack (piston), the medium produces a downward resultant force to the main valve clack (piston), so that the main valve is in a closed and sealed state. When the medium pressure rises to reach the setting pressure, the medium pushes the valve core of the pilot valve at the sealing surface of the pilot valve, the pilot valve is firstly opened, so that the valve core of the pilot valve is in an opening state, and meanwhile, the slide valve in the valve cavity of the pilot valve moves and seals a channel between the valve cavity of the pilot valve and the lower guide pipe; the medium in the back pressure chamber above the main valve clack is exhausted via the valve core opening part of the pilot valve to reduce the pressure in the back pressure chamber, and the main valve clack is opened under the push of the inlet medium pressure to release the pressure in the system. When the medium pressure is reduced to a certain value, the valve core of the pilot valve is reset to return to the seat under the action of the spring, the valve core of the pilot valve is closed, meanwhile, the sliding valve of the valve cavity of the pilot valve is pushed to move, a channel between the valve cavity of the pilot valve and the lower guide pipe is opened, the medium enters the back pressure chamber above the valve clack of the main valve through the lower guide pipe and the valve cavity of the pilot valve again, and the valve clack of the main valve is pushed to return to the seat to be closed.

The prior pilot operated safety valve has the following technical defects when in use: the main valve and the pilot valve are two independent bodies, the main valve and the pilot valve are connected through a lower guide pipe, an upper guide pipe and an intermediate guide pipe, the lower guide pipe is connected between an inlet of the main valve and an inlet of the pilot valve, the upper guide pipe is connected between an outlet of the main valve and an outlet of the pilot valve, and the intermediate guide pipe is connected between a valve cavity of the pilot valve and a back pressure chamber above a valve clack of the main valve.

SUMMERY OF THE UTILITY MODEL

In order to solve current pilot operated relief valve occupation space big, the easy not hard up and the higher problem of manufacturing cost of coupling pipe joint, the utility model provides a new pilot operated relief valve, the pilot valve of this new pilot operated relief valve carries out the integrated design with the main valve gap, the valve structure has been simplified under the unchangeable condition of performance, the internal passage by the main valve gap has replaced middle pipe, the whole height of valve has been reduced, compact structure, occupation space is little, low in production cost has expanded the application range of valve, also can not make the not hard up production of coupling department of lower pipe and upper catheter reveal because of the pilot valve vibration simultaneously.

The technical scheme of the utility model is that: a new pilot operated safety valve, including the main valve, the said main valve includes main valve body, main valve clack and main valve bonnet, there are inlet and outlet of main valve on the valve body of main valve, the main valve clack locates in guide sleeve and can slip in the guide sleeve, the main valve clack corresponds to valve seat of main valve, the valve bonnet of main valve is fixed above valve body of main valve, characterized by that: the valve cover of the main valve is internally provided with a slide valve, a guide valve seat and a guide valve clack in sequence from left to right, the guide valve seat is internally provided with a guide valve cavity, the slide valve penetrates through the guide valve cavity, one end of the slide valve is abutted against the guide valve clack, the left side and the right side of the valve cover of the main valve are respectively provided with a guide valve inlet and a guide valve outlet, the guide valve inlet is communicated with the inlet of the main valve through a lower guide pipe, the guide valve cavity is communicated with a back pressure cavity of the main valve clack through an internal channel on the valve cover of the main valve, and the guide valve outlet is communicated with the outlet of the main valve through an upper guide pipe.

The adjusting sleeve is in threaded connection with the main valve cover, the adjusting sleeve is provided with a central hole, one end of the valve rod is inserted into the central hole, the other end of the valve rod is abutted to the valve clack of the pilot valve, the spring is arranged between the adjusting sleeve and the valve rod, and the spring has an elastic tendency of pushing the valve rod to the valve clack of the pilot valve.

The utility model discloses following beneficial effect has: by adopting the technical scheme, the original pilot valve body is replaced by the main valve cover, the pilot valve and the main valve are integrated into a whole, the original middle guide pipe is replaced by the internal channel, and the pilot valve and the main valve cover are integrally designed.

Drawings

Fig. 1 is a structural sectional view of the present invention.

Figure 2 is the mounting structure cross-sectional view of the pilot valve flap 11 of the present invention.

In the figure 1-main valve, 2-main valve body, 3-main valve flap, 4-main valve bonnet, 5-main valve inlet, 6-main valve outlet, 7-pilot sleeve, 8-main valve seat, 9-slide valve, 10-pilot valve seat, 11-pilot valve flap, 12-pilot valve cavity, 13-pilot valve inlet, 14-pilot valve outlet, 15-downcomer, 16-internal channel, 17-back pressure cavity, 18-top duct, 19-trim sleeve, 20-valve stem, 21-spring, 22-centre hole.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1-2, a new pilot operated safety valve comprises a main valve 1, the main valve 1 comprises a main valve body 2, a main valve flap 3 and a main valve bonnet 4, the main valve body 2 is provided with a main valve inlet 5 and a main valve outlet 6, the main valve flap 3 is located in a guide sleeve 7 and can slide in the guide sleeve 7, the main valve flap 3 corresponds to the main valve seat 8, the main valve bonnet 4 is fixed above the main valve body 2, a slide valve 9, a pilot valve seat 10 and a pilot valve flap 11 are sequentially installed in the main valve bonnet 4 from left to right, a pilot valve cavity 12 is arranged in the pilot valve seat 10, the slide valve 9 penetrates through the pilot valve cavity 12, one end of the slide valve 9 is abutted against the pilot valve flap 11, the left side and the right side of the main valve bonnet 4 are respectively provided with a pilot valve inlet 13 and a pilot valve outlet 14, the pilot valve inlet 13 is communicated with the main valve inlet 5 through a lower guide pipe 15, the pilot valve cavity 12 is communicated with a back pressure cavity 17 of the main valve flap 3 through an internal channel 16 on the main valve bonnet 4, the pilot valve outlet 14 communicates with the main valve outlet 6 via an upper conduit 18. Because the technical proposal is adopted, the valve cover 4 of the main valve replaces the original pilot valve body, the pilot valve and the main valve 1 are integrated into a whole, the internal channel 16 replaces the original middle pilot pipe, the pilot valve and the valve cover 4 of the main valve are designed into a whole, the valve structure is simplified under the condition of unchanged performance, the overall height of the valve is reduced, the structure is compact, the occupied space is small, the production cost is low, the application range of the valve is expanded, because the main valve bonnet 4 and the main valve body 2 are in a fixed and integrated structure, the main valve body 2, the main valve bonnet 4, the lower guide pipe 15, the upper guide pipe 18 and the pipe joint vibrate synchronously due to the vibration generated when the sliding valve 9 and the pilot valve clack 11 work, at the moment, the pipe joint of the lower guide pipe 15 and the upper guide pipe 18 is in a relative static state, the vibration does not loosen the pipe joint and thus the leakage does not occur at the pipe joint of the lower and upper ducts 15 and 18.

An adjusting sleeve 19, a valve rod 20 and a spring 21 are installed at the position of a pilot valve outlet 14 on the main valve cover 4, the adjusting sleeve 19 is in threaded connection with the main valve cover 4, a central hole 22 is formed in the adjusting sleeve 19, one end of the valve rod 20 is inserted into the central hole 22, the other end of the valve rod 20 is abutted against the pilot valve clack 11, the spring 21 is arranged between the adjusting sleeve 19 and the valve rod 20, and the spring 21 has an elastic tendency of pushing the valve rod 20 to the pilot valve clack 11. The tightness state of the spring 21 can be adjusted by the adjusting sleeve 19, and further the medium pressure pushing the pilot valve clack 11 open, namely the setting pressure of the valve is adjusted.

Claims (2)

1. The utility model provides a new guide's formula relief valve, includes main valve (1), main valve (1) is including main valve body (2), main valve clack (3) and main valve gap (4), is equipped with main valve import (5) and main valve export (6) on main valve body (2), and main valve clack (3) are located uide bushing (7) and can slide in uide bushing (7), and main valve clack (3) correspond with main valve disk seat (8), and main valve gap (4) are fixed in main valve body (2) top, its characterized in that: a sliding valve (9), a pilot valve seat (10) and a pilot valve clack (11) are sequentially installed in the main valve cover (4) from left to right, a pilot valve cavity (12) is arranged in the pilot valve seat (10), the sliding valve (9) penetrates through the pilot valve cavity (12), one end of the sliding valve (9) is abutted to the pilot valve clack (11), a pilot valve inlet (13) and a pilot valve outlet (14) are respectively arranged on the left side and the right side of the main valve cover (4), the pilot valve inlet (13) is communicated with the main valve inlet (5) through a lower guide pipe (15), the pilot valve cavity (12) is communicated with a back pressure cavity (17) of the main valve clack (3) through an internal channel (16) in the main valve cover (4), and the pilot valve outlet (14) is communicated with the main valve outlet (6) through an upper guide pipe (18).

2. The new piloted safety valve as in claim 1, wherein: an adjusting sleeve (19), a valve rod (20) and a spring (21) are installed at a pilot valve outlet (14) on a main valve cover (4), the adjusting sleeve (19) is in threaded connection with the main valve cover (4), a central hole (22) is formed in the adjusting sleeve (19), one end of the valve rod (20) is inserted into the central hole (22), the other end of the valve rod (20) is abutted to a pilot valve clack (11), the spring (21) is arranged between the adjusting sleeve (19) and the valve rod (20), and the spring (21) has an elastic tendency of pushing the valve rod (20) to the pilot valve clack (11).

Images