CN219588200U

CN219588200U - Safety valve

Info

Publication number: CN219588200U
Application number: CN202223187239.3U
Authority: CN
Inventors: 陆宇峰; 陆林
Original assignee: Yangzhong Zhongcheng Pipeline Fittings Co ltd
Current assignee: Yangzhong Zhongcheng Pipeline Fittings Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-08-25
Anticipated expiration: 2032-11-30

Abstract

A relief valve includes a valve body, a spool, a spring, and a pressure regulating portion; an inner cavity, an inlet and an outlet are arranged in the valve body, the inner cavity is connected with the inlet and the outlet, a first ladder-shaped structure is arranged at the inlet, and a bevel chamfer is arranged behind the first ladder-shaped structure; the front end of the valve core is provided with a second step structure matched with the step structure at the inlet of the valve body, the valve core is positioned in the inner cavity of the valve body, and the valve core is connected with the inlet of the valve body; the spring is positioned between the valve core and the pressure regulating part, one end of the spring is propped against the rear end face of the valve core, the other end of the spring is propped against the pressure regulating part, and the pressure regulating part is used for regulating the deformation of the spring; compared with the prior art, the valve core is matched and connected with the second step-shaped structure at the front end of the valve core through the first step-shaped structure at the inlet of the valve body, and the valve core can be firmly propped against the inlet of the valve body through the elasticity improved by the deformation of the spring.

Description

Safety valve

Technical Field

The utility model relates to a safety valve.

Background

The safety valve is a special valve which is in a normally closed state under the action of external force and prevents the medium pressure in the pipeline or the equipment from exceeding a specified value by discharging the medium to the outside of the system when the medium pressure in the equipment or the pipeline rises to exceed the specified value. The safety valve belongs to automatic valves, and is mainly used for boilers, pressure vessels and pipelines, and the control pressure does not exceed a specified value, so that the safety valve plays an important role in protecting personal safety and equipment operation.

Safety valves are important safety accessories on boilers, pressure vessels, and other pressurized equipment. The safety valve (also called as relief valve) is automatically opened and closed according to the working pressure (working temperature) of the pressure system, and is generally installed on equipment or pipelines of a closed system to protect the safety of the system. When the pressure or temperature in the equipment or the pipeline exceeds the set pressure of the safety valve, the pressure relief or the temperature reduction is automatically opened, the medium pressure (temperature) in the equipment and the pipeline is ensured to be under the set pressure (temperature), the equipment and the pipeline are protected from working normally, accidents are prevented, and the loss is reduced.

Safety valves are mainly widely used: steam boilers, liquefied petroleum gas tank trucks or liquefied petroleum gas rail tank trucks, oil recovery wells, high pressure bypasses of steam power generation equipment, pressure pipelines, pressure vessels, and the like. The safety valve is generally divided into a spring type safety valve and a lever type safety valve according to structural forms, wherein the spring type safety valve is most commonly used; the device is divided into a thread safety valve and a flange safety valve according to a connecting mode. The caliber of the safety valve is not large, the caliber is usually between DN15mm and DN80mm, and the caliber exceeding 150mm is commonly called as a large caliber safety valve.

However, in the conventional safety valve, there is a problem in sealing, and when the pressure is too high, gas or liquid in the pipe easily passes through the safety valve, so that the tightness of the inside of the safety valve needs to be improved.

The utility model comprises the following steps:

the utility model aims to solve the defects in the prior art and provides a safety valve.

A safety valve includes a main body including a valve body, a valve spool, a spring, and a pressure regulating portion;

the valve body is internally provided with an inner cavity, an inlet and an outlet, the inner cavity is connected with the inlet and the outlet, the inlet is positioned at the front end of the valve body, the outlet is positioned at the rear end of the valve body, a first ladder-shaped structure is arranged at the inlet, and a bevel chamfer is arranged behind the ladder-shaped structure;

the front end of the valve core is provided with a second step structure matched with the step structure at the inlet of the valve body, a groove is arranged at the rear of the second step structure, a sealing ring is arranged in the groove, the valve core is positioned in an inner cavity in the valve body, and the valve core is connected with the inlet of the valve body;

when sealing is needed, the valve core blocks the inlet, the first step structure and the second step structure are matched and connected, the sealing ring is propped against the bevel chamfer, when sealing is not needed, the front end of the valve core exits the inlet, the first step structure and the second step structure are separated, and the sealing ring is separated from the bevel chamfer;

the spring is located between the valve core and the pressure adjusting part, one end of the spring abuts against the rear end face of the valve core, the other end of the spring abuts against the pressure adjusting part, and the pressure adjusting part is used for adjusting deformation of the spring.

The working principle of the utility model is as follows: according to the valve, the first stepped structure at the inlet of the valve body is matched and connected with the second stepped structure at the front end of the valve core, the valve core can be firmly abutted against the inlet of the valve body by the aid of the elastic force improved by deformation of the spring, the inlet is blocked, in addition, the stepped structure can block the valve core to move continuously along the elastic force, movement of the valve core is effectively limited, and liquid or gas in a pipeline cannot pass through due to the fact that the bevel chamfer is matched with the sealing ring.

In order to fix the spring, the middle part is prevented from deforming after the spring is deformed, so that the end part of the spring moves, the whole spring is fixed and misplaced, a groove is formed in the rear end face of the valve core, the groove is used for fixing the spring, one end of the spring is located in the groove, and the other end of the spring abuts against the pressure adjusting part.

For the deformation degree of convenient regulation spring to guarantee can not lead to the removal of pressure regulation part owing to the reaction force of spring, guarantee the stability of spring deformation, pressure regulation part be adjusting nut, adjusting nut outer wall be equipped with the screw thread, the valve body inner wall on be equipped with the screw thread, adjusting nut threaded connection in the inside of valve body.

In order to ensure the stability of the connection of the safety valve and the pipeline and prevent leakage, the valve body further comprises a connecting part, the connecting part is used for being connected with the pipeline, threads are arranged at the connecting part, a groove is formed in the rear of the connecting part, and a sealing ring is arranged in the groove.

In order to prevent dust from entering the inner cavity of the valve body, the valve further comprises a dust cover, wherein the dust cover comprises a first side plate, a second side plate and a bottom plate, the first end of the first side plate is connected with one end of the bottom plate, the other end of the bottom plate is connected with the first end of the second side plate, and the second ends of the first side plate and the second side plate are respectively provided with inward bends; the dust cover covers the outside of the outlet;

the rear end of the outer wall of the valve body is provided with a groove, and the bending clamp is arranged in the groove.

The beneficial effects are that:

compared with the prior art, the valve core is matched and connected with the second step-shaped structure at the front end of the valve core through the first step-shaped structure at the inlet of the valve body, the valve core can be firmly abutted against the inlet of the valve body by the elasticity improved by the deformation of the spring, the inlet is blocked, and in addition, the valve core can be blocked from moving continuously along the elasticity by the step-shaped structure, so that the movement of the valve core is effectively limited;

the combination of the bevel chamfer and the sealing ring can prevent the liquid or the gas in the pipeline from passing through, the connection between the valve core and the valve body is tighter, the bevel chamfer has larger contact area than the straight edge, the valve core moves forwards, the sealing ring is tightly clamped, the pressure is higher, the gas or the liquid in the pipeline is easier to leak, the contact between the straight edge and the sealing ring is not affected by the elastic force, but the influence of the elastic force on the bevel edge can generate a reaction force on the sealing ring, so that the sealing ring is in closer contact with the bevel edge, the bevel edge is narrower, and a component force is generated above the sealing ring by the bevel edge, so that the sealing ring is in closer contact with the bevel edge.

The nut is rotated inwards and outwards, and the acting force of the spring on the valve core is changed by changing the deformation of the spring, so that the pressure required by the movement of the valve core is changed, and the pressure required by the starting of the safety valve is changed; meanwhile, the bending part of the dust cover is clamped in the groove on the outer wall of the valve body, so that the dust cover is fixed more firmly.

Drawings

FIG. 1 is a schematic illustration of a safety valve;

in the figure, 1, valve body, 2, case, 3, spring, 4, adjusting nut, 5, dust cover, 6, inner chamber, 7, junction, 8, hypotenuse chamfer, 9, second echelonment structure, 10, first ladder structure.

Detailed Description

The present utility model will be further described in detail with reference to the following examples and drawings for the purpose of enhancing the understanding of the present utility model, which examples are provided for the purpose of illustrating the present utility model only and are not to be construed as limiting the scope of the present utility model.

As shown in fig. 1, a valve body 1, a valve core 2, a spring 3, an adjusting nut 4, a dust cover 5, an inner cavity 6, a connecting part 7, a bevel chamfer 8, a second stepped structure 9 and a first stepped structure 10;

a relief valve comprises a valve body 1, a valve core 2, a spring 3 and a pressure regulating part;

the valve body 1 is internally provided with an inner cavity 6, an inlet and an outlet, the inner cavity 6 is connected with the inlet and the outlet, the inlet is positioned at the front end of the valve body 1, the outlet is positioned at the rear end of the valve body 1, a first ladder-shaped structure 10 is arranged at the inlet, and a bevel chamfer 8 is arranged behind the ladder-shaped structure;

the front end of the valve core 2 is provided with a second step-shaped structure 9 matched with the step-shaped structure at the inlet of the valve body 1, a groove is arranged at the rear of the second step-shaped structure 9, a sealing ring is arranged in the groove, the valve core 2 is positioned in an inner cavity 6 in the valve body 1, and the valve core 2 is connected with the inlet of the valve body 1;

when sealing is needed, the valve core 2 blocks the inlet, the first step-shaped structure 10 and the second step-shaped structure 9 are matched and connected, the sealing ring is propped against the bevel chamfer 8, when sealing is not needed, the front end of the valve core 2 exits from the inlet, the first step-shaped structure 10 and the second step-shaped structure 9 are separated, and the sealing ring is separated from the bevel chamfer 8;

the spring 3 is located between the valve core 2 and the pressure adjusting part, one end of the spring 3 abuts against the rear end face of the valve core 2, the other end of the spring 3 abuts against the pressure adjusting part, and the pressure adjusting part is used for adjusting deformation of the spring 3.

In this embodiment, a groove is formed in the rear end face of the valve core 2, the groove is used for fixing the spring 3, one end of the spring 3 is located in the groove, and the other end of the spring 3 abuts against the pressure adjusting portion.

In this embodiment, the pressure adjusting part is an adjusting nut 4, the outer wall of the adjusting nut 4 is provided with threads, the inner wall of the valve body 1 is provided with threads, and the adjusting nut 4 is in threaded connection with the inside of the valve body 1.

In this embodiment, the valve body 1 further includes a connection portion 7, the connection portion 7 is used for being connected with a pipeline, the connection portion 7 is provided with threads, a groove is formed in the rear of the connection portion 7, and a sealing ring is arranged in the groove.

In this embodiment, the dust cover 5 further includes a first side plate, a second side plate, and a bottom plate, where a first end of the first side plate is connected to one end of the bottom plate, and another end of the bottom plate is connected to a first end of the second side plate, and second ends of the first side plate and the second side plate are both provided with inward bends; the dust cover 5 covers the outside of the outlet;

the rear end of the outer wall of the valve body 1 is provided with a groove, and the bending clamp is arranged in the groove.

The using method comprises the following steps: the adjusting nut 4 is rotated inwards or outwards to a proper position, the pressure required by starting the safety valve is determined, the pipeline outlet is connected with the outer side threads of the valve body 1, the sealing ring is covered, leakage is prevented through the sealing ring, when the pressure in the pipeline exceeds a preset value, the pressure pushes the valve core 2 to move, and the gas in the pipeline is discharged from the outlet through the inlet of the valve body 1 or enters the cavity to be discharged from the outlet, so that the pressure in the pipeline is relieved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A safety valve comprises a main body, and is characterized in that the main body comprises a valve body, a valve core, a spring and a pressure regulating part;

the valve body is internally provided with an inner cavity, an inlet and an outlet, the inner cavity is connected with the inlet and the outlet, the inlet is positioned at the front end of the valve body, the outlet is positioned at the rear end of the valve body, a first ladder-shaped structure is arranged at the inlet, and a bevel chamfer is arranged behind the first ladder-shaped structure;

2. The safety valve according to claim 1, wherein the rear end face of the valve core is provided with a groove for fixing a spring, one end of the spring is located in the groove, and the other end of the spring abuts against the pressure adjusting portion.

3. The safety valve according to claim 1, wherein the pressure adjusting part is an adjusting nut, the outer wall of the adjusting nut is provided with threads, the inner wall of the valve body is provided with threads, and the adjusting nut is in threaded connection with the inner part of the valve body.

4. The safety valve according to claim 1, wherein the valve body further comprises a joint, the joint is used for being connected with a pipeline, threads are arranged at the joint, a groove is formed in the rear of the joint, and a sealing ring is arranged in the groove.

5. The safety valve according to claim 1, further comprising a dust cover, wherein the dust cover comprises a first side plate, a second side plate and a bottom plate, wherein a first end of the first side plate is connected with one end of the bottom plate, and the other end of the bottom plate is connected with a first end of the second side plate, and the second ends of the first side plate and the second side plate are provided with inward bends; the dust cover covers the outside of the outlet;