Axial-flow type check valve for high-pressure hydrogenation

Abstract

The utility model discloses an axial-flow type check valve for high-pressure hydrogenation, which comprises a valve body, and a valve clack, a guide rod, a guide sleeve, a flow guide cover and a spring which are arranged in the valve body, and the valve clack, the guide rod, the guide sleeve and the flow guide cover are all coaxial with the axis of the valve body; guide rods are arranged in front of and behind the valve clack, the guide rod at the front end is matched with the guide sleeve at the inlet end, and the guide rod at the rear end is matched with the guide sleeve in the flow guide cover, so that a bidirectional supporting structure of the valve clack is formed, and scrapers are arranged at the two ends of the front guide sleeve and the rear guide sleeve which are arranged at the inlet and outlet ends of the valve and used for supporting the valve clack. The sealing surface of the valve body and the sealing surface on the valve clack form a main sealing pair for sealing the valve; a flow guide cover is installed on the outlet side of the valve body, a circle of notches are formed in the end face of the flow guide cover, a plurality of groove holes are formed in the flow guide cover body, and a flow guide hole is formed in the tail. According to the valve, jamming caused by the coking risk is reduced, and economic losses caused by valve failure, device shutdown and the like are avoided.

Description

Technical Field

[0001] The utility model belongs to the field of industrial valves and relates to a valve, in particular to an axial flow check valve for high-pressure hydrogenation. Background Art

[0002] The function of a check valve is to allow the medium to flow in one direction only and prevent the medium from flowing in the opposite direction. Usually, this type of valve works automatically and belongs to the automatic valve category. The axial flow check valve adopts an axial flow shuttle structure, and its valve core is installed with a buffer shock-absorbing spring. When the medium flows downstream, the valve core opens, and the medium flows through the axial flow channel of the valve body. When the medium pushes the valve core open, the spring plays a buffering effect, avoiding the impact vibration between the valve core and the valve body when the ordinary check valve is opened. When the medium flows in the reverse direction, the valve core closes quickly, and the valve core fits tightly with the valve seat to prevent the medium from flowing in the reverse direction.

[0003] Axial flow check valves have the characteristics of energy saving, noise reduction, low flow resistance, low pressure drop, water hammer resistance, and rapid switching. Axial flow check valves for high-pressure hydrogenation are installed at the outlet of the hydrogenation feed pump. The valve can be flexibly operated under high temperature and high pressure, residual oil hydrogenation, and medium coking conditions. It is used to prevent high pressure from flowing into low pressure when the pump is stopped to avoid safety accidents, and is an important safety line of defense.

[0004] China's invention patent application No. 201510759535.1 authorized the "Axial Flow Check Valve". The present invention discloses an axial flow check valve, including a valve body, a valve disc arranged in the valve body, a valve stem and a spring providing elastic force for the valve disc. After the damping hole, pressure relief hole, damping chamber, inner valve sleeve chamber and sealing ring are set, the valve disc can be opened and closed smoothly and at a low speed; the guide rod is reasonably set to effectively prevent the valve disc from rotating and ensure that the valve disc is opened and closed smoothly.

[0005] Chinese utility model patent 201621288960.3 authorized "An axial flow check valve". This utility model patent is an axial flow check valve, which adds a guide seat on the valve seat and a guide rod in front of the valve disc. During the closing and opening process of the valve, better guidance is achieved and the valve disc can be pressed onto the valve disc more accurately, ensuring that the sealing performance is still good after long-term operation, and optimizing the flow channel of the valve.

[0006] The axial flow check valve authorized by the above patents is designed in terms of water hammer prevention and structural optimization, mainly for conventional fluids, and cannot solve the problem of valve failure caused by long-term use under high temperature and high pressure, viscous media or coking conditions. The utility model redesigns the valve structure for high temperature and high pressure, residual oil hydrogenation and easy coking conditions, so that it can be operated flexibly under the above conditions to ensure safety. Summary of the invention

[0007] In order to solve the technical problems in the prior art of valve front-to-back pressure leakage and valve movement obstruction caused by coking of viscous media such as residual oil, the utility model provides an axial flow check valve for high-pressure hydrogenation.

[0008] The utility model provides an axial flow check valve for high-pressure hydrogenation, which includes a valve body and a valve disc, a guide rod, a guide sleeve, a flow guide cover and a spring arranged inside the valve body, wherein the valve disc, the guide rod, the guide sleeve and the flow guide cover are all coaxial with the valve body axis; the valve body is an integrated valve body, the valve body has and has only two ports, one side is an inlet end, and the other side is an outlet end, a valve disc that can reciprocate is arranged on an axis coaxial with the flow direction of the medium in the valve body, the valve disc adopts a spherical surface design, a sealing surface is arranged on it, and hard alloy is welded on the sealing surface to achieve the effects of erosion resistance, corrosion resistance and wear resistance, guide rods are arranged before and after the valve disc, the front guide rod cooperates with the guide sleeve at the inlet end, and the rear guide rod cooperates with the guide sleeve in the flow guide cover to form a structure of bidirectional support for the valve disc, and the guide rod can reciprocate in the guide sleeve to control the opening and closing of the valve; scrapers are arranged at both ends of the front and rear guide sleeves supporting the valve disc arranged at the inlet and outlet ends of the valve, and the scrapers of the guide sleeves are used to scrape the guide sleeves when the valve disc reciprocates The surface of the rod is scraped to prevent the medium from being retained on the matching parts, thereby reducing the obstruction caused by the risk of coking; a sealing surface is provided on the valve body, and the sealing surface of the valve body and the sealing surface on the valve disc constitute a main sealing pair, which is used for sealing the valve to prevent pressure from flowing before and after the valve; a guide cover is installed at the outlet side of the valve body, and a circle of notches is provided on the end face of the guide cover. Several slots are opened on the guide cover body, and a guide hole is opened at the tail. The notch on the end face can reduce the contact area with the valve disc when the valve is fully opened, thereby reducing the possibility of adhesion; when the valve disc is fully opened, it can form an integral flow-through component together with the guide cover, and form a fluid channel with the inner wall of the valve body. A guide sleeve is centrally installed in the guide cover, and the guide sleeve cooperates with the guide rod to guide the valve disc to open and close at the correct position; a spring is provided between the valve disc and the guide cover, one end of which is sleeved on the valve disc boss, and the other end is sleeved on the guide cover boss. When the valve is closed, the spring has a certain amount of compression to make the valve disc sealing surface contact with the valve body sealing surface.

[0009] When the medium flows in from the inlet, the valve disc opens and the medium flows through the axial flow channel of the valve body. When the medium pushes the valve disc open, the spring plays a buffering effect, avoiding the impact vibration between the valve core and the valve body when the ordinary check valve is opened. When the medium flows in from the outlet, the spring assists the valve disc to close quickly, and the sealing surface of the valve disc fits tightly with the sealing surface of the valve body to prevent the medium from flowing in reverse.

[0010] As an improved solution, as a further improved solution, the connection between the deflector cover and the valve body is threaded connection or bolt connection.

[0011] As a further improved solution, the guide cover may adopt a streamlined design to reduce fluid resistance and improve the flow capacity of the valve.

[0012] As a further improved solution, the deflector cover is installed on the step groove on the outlet side of the valve body, and a four-open ring is designed close to it. The four-open ring is installed from the outlet side end, the four-open ring is clamped in the groove of the valve body, and then screws are used to fasten it to the deflector cover. Under the thrust of the medium, the deflector cover will not withdraw from the outlet end.

[0013] As a further improved solution, the guide sleeve is connected to the deflector cover by threading and spot welded to prevent rotation. The guide sleeve cooperates with the guide rod to guide the valve disc to open and close at the correct position.

[0014] As a further improved solution, the guide rod is in one piece or two pieces.

[0015] As a further improved solution, hard alloy is built-up on the inner hole of the guide sleeve to improve the hardness and service life of the scraping angle formed.

[0016] As a further improved solution, a fixing pin is arranged in the guide sleeve at the guide cover, which cooperates with the valve flap guide rod to prevent the valve flap from rotating. A groove is opened on the guide rod that cooperates with the guide sleeve at the end of the guide cover, which serves as the movement path of the pin during the sliding process of the guide rod, and is used to prevent radial rotation of the guide rod and then radial rotation of the valve flap, thereby improving the sealing fit of the valve flap when it is sealed.

[0017] As a further improved solution, lifting ears and supporting legs are provided on the valve body to facilitate the lifting and stable placement of the valve.

[0018] The utility model has the following beneficial effects:

[0019] 1) Both ends of the front and rear guide sleeves supporting the valve disc at the inlet and outlet of the valve are designed with scrapers. When the valve disc reciprocates, the scrapers of the guide sleeve scrape the surface of the guide rod, so that the medium cannot be retained on the matching parts, reducing the risk of coking and causing jamming;

[0020] 2) The inner hole of the guide sleeve is welded with hard alloy to improve the hardness and service life of the scraping angle;

[0021] 3) The end face of the guide cover is designed with a circle of notches, the guide cover body is opened with several slots, and the tail is opened with a guide hole. The notches on the end face can reduce the contact area with the valve disc when the valve is fully opened, reducing the possibility of adhesion;

[0022] 4) The valve's return and centering capabilities will not decrease after long-term use in harsh environments such as residual oil hydrogenation, especially in viscous media such as residual oil;

[0023] 5) The valve is not prone to getting stuck when the medium conditions or structure cause dead zones in the medium flow and cause coking of the medium, thus avoiding valve failure, equipment shutdown and economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the closed position of an axial flow check valve for high-pressure hydrogenation according to the utility model;

[0025] Figure 2 This is a schematic diagram of the opening position of an axial flow check valve for high-pressure hydrogenation according to the utility model;

[0026] Figure 3 It is a schematic diagram of the guide sleeve and the scraper on the guide sleeve;

[0027] Figure 4 is a schematic diagram of the deflector cover;

[0028] Figure 5 Schematic diagram of the valve disc anti-rotation structure.

[0029] In the figure: 1-valve body, 2-valve disc, 3-guide rod, 4-spring, 5-guide sleeve, 6-guide cover, 7-pin, 8-four open rings, 9-screw, 10-step groove, 11-groove, 12-sealing surface, 13-scraper, 14-notch, 15-slot hole, 16-guide hole, 17-notch two. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 5 As shown, the utility model describes an axial flow check valve for high-pressure hydrogenation, which mainly includes a valve body 1 for bearing pressure, a valve disc 2 for controlling the opening and closing of the valve, a guide cover 6 for fluid flow, a guide sleeve 5 and a guide rod 3 for guiding the valve disc, and a spring 4 for shock absorption and resetting.

[0032] The valve body 1 is an integrated valve body, on which lifting ears and supporting legs are arranged to facilitate the lifting and stable placement of the valve. The valve body 1 has and only has two ports, one is the inlet end, and the other is the outlet end. A supporting structure for supporting the valve disc 2 is arranged at the inlet end of the valve body, on which a guide sleeve 5 is arranged. The guide sleeve 5 can be integrally formed with the valve body 1, or can be installed as two separate bodies. A sealing surface is arranged on the valve body 1, and a hard alloy is welded on the sealing surface to achieve the effects of erosion resistance, corrosion resistance, and wear resistance. The sealing surface and the sealing surface on the valve disc 2 form a main sealing pair, which is used for sealing the valve to prevent pressure from flowing before and after the valve.

[0033] A flow guide 6 is installed at the outlet side of the valve body. When the valve disc 2 is fully opened, it can form an integral flow-through component together with the flow guide 6, and form a fluid channel with the inner wall of the valve body. The flow guide 6 can be designed in a streamlined manner to reduce fluid resistance and improve the flow capacity of the valve. The flow guide 6 is installed from the outlet side end and installed on the step groove 10 on the outlet side of the valve body. A four-open ring 8 is designed close to it. The four-open ring 8 is also installed from the outlet side end. The four-open ring is clamped in the valve body groove 11, and then it is fastened to the flow guide 6 with screws 9. The flow guide 6 will not withdraw from the outlet end under the thrust of the medium. A guide sleeve 5 is installed in the center of the flow guide 6. The guide sleeve 5 is connected to the flow guide 6 by threading and spot-welded to prevent rotation. The guide sleeve 5 cooperates with the guide rod 3 to guide the valve disc 2 to open and close at the correct position.

[0034] The valve body has a reciprocating opening and closing valve disc 2 on an axis coaxial with the medium flow direction, and its position is between the valve body sealing surface 12 and the guide cover 6. The valve disc 2 is also installed from the outlet side. The valve disc 2 adopts a spherical surface design, and a sealing surface is provided on it. Hard alloy is welded on the sealing surface. Guide rods 3 are provided before and after the valve disc 2. The guide rods 3 can be one-piece or two-piece. The front guide rod 3 cooperates with the guide sleeve 5 at the inlet end, and the rear guide rod 3 cooperates with the guide sleeve in the guide cover 6 to form a bidirectional support structure for the valve disc 3. The valve disc 2, guide rod 3, guide sleeve 5 and guide cover 6 are all coaxial with the axis of the valve body 1. A spring 4 is arranged between the valve disc 2 and the guide cover 6, one end of which is sleeved on the boss of the valve disc 2, and the other end is sleeved on the boss of the guide cover 6. When the valve is closed, the spring 4 has a certain amount of compression to make the valve disc sealing surface contact with the valve body sealing surface. When the medium flows in from the inlet end, the valve disc 2 opens, and the medium flows through the axial flow channel of the valve body. When the medium pushes the valve disc open, the spring 4 plays a buffering effect, avoiding the impact vibration between the valve core and the valve body 1 when the ordinary check valve is opened. When the medium flows in from the outlet end, the spring assists the valve disc 2 to close quickly, and the sealing surface of the valve disc 2 fits tightly with the sealing surface of the valve body to prevent the medium from flowing in reverse.

[0035] Scrapers 13 are provided at both ends of the front and rear guide sleeves 5 supporting the valve disc at the inlet and outlet ends of the valve. Figure 3 As shown, when the valve disc 2 reciprocates, the scraper 13 on the guide sleeve 5 scrapes the surface of the guide rod 3, so that the medium cannot be retained on the matching parts, reducing the risk of jamming caused by coking. The inner hole of the guide sleeve is welded with hard alloy, so that the hardness and service life of the scraping angle formed are improved.

[0036] like Figure 4As shown, the end face of the guide cover 6 is designed with a circle of notches 14, the body of the guide cover 6 is provided with several slots 15, and the tail is provided with a guide hole 16. The notches 14 on the end face can reduce the contact area with the valve disc 2 when the valve is fully opened, reducing the possibility of adhesion. When the valve disc is fully opened, the medium can also enter from the end face notches 14 and several slots on the body of the guide cover 6, and flow out from the tail guide hole, forming a medium exchange, and no closed space will be formed inside the guide cover, reducing the risk of coking caused by medium retention. At the same time, when the medium refluxes, the medium can enter the rear end of the valve disc from the notches 14 and the guide holes, and work together with the spring to assist the valve disc to close.

[0037] like Figure 5 As shown, a fixing pin 7 is provided on the guide sleeve at the deflector 6, and a notch 17 is provided on the guide rod 3 which cooperates with the guide sleeve 5 at the end of the deflector 6, serving as a movement path of the pin 7 during the sliding process of the guide rod 3, and is used to prevent radial rotation of the guide rod 3 and then radial rotation of the valve flap 2, thereby improving the sealing fit of the valve flap 2 when sealing.

[0038] The above is only a typical embodiment of the utility model, and does not impose any formal limitation on the utility model. Any changes or modifications made by any technician familiar with the profession, without departing from the scope of the technical solution of the utility model, using the above content should be regarded as equivalent examples of equivalent changes. Any equivalent changes made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model are within the scope of the technical solution of the utility model.

Claims

1. An axial flow check valve for high pressure hydrogenation, characterized in that: The check valve comprises a valve body and a valve disc, a guide rod, a guide sleeve, a flow guide cover and a spring arranged inside the valve body, wherein the valve disc, the guide rod, the guide sleeve and the flow guide cover are all coaxial with the valve body axis; the valve body is an integrated valve body, the valve body has and has only two ports, one side is the inlet end, and the other side is the outlet end, a valve disc that can reciprocate is arranged on an axis coaxial with the medium flow direction in the valve body, the valve disc adopts a spherical surface design, a sealing surface is arranged on it, and hard alloy is welded on the sealing surface, guide rods are arranged before and after the valve disc, the front guide rod cooperates with the guide sleeve at the inlet end, and the rear guide rod cooperates with the guide sleeve in the flow guide cover to form a structure of bidirectional support for the valve disc, and the guide rod can reciprocate in a straight line in the guide sleeve to control the opening and closing of the valve; the valve inlet and outlet ends are arranged Scrapers are provided at both ends of the front and rear guide sleeves supporting the valve disc; a sealing surface is provided on the valve body, and the valve body sealing surface and the sealing surface on the valve disc constitute a main sealing pair; a guide cover is installed at the outlet side of the valve body, and a circle of notches is provided on the end face of the guide cover. Several slots are opened on the guide cover body, and a guide hole is opened at the tail. When the valve disc is fully opened, it can form an integral flow-through component with the guide cover, and form a fluid channel with the inner wall of the valve body. A guide sleeve is centrally installed in the guide cover, and the guide sleeve cooperates with the guide rod to guide the valve disc to open and close at the correct position; a spring is arranged between the valve disc and the guide cover, one end of which is sleeved on the valve disc boss, and the other end is sleeved on the guide cover boss. When the valve is closed, the spring has a certain amount of compression to make the valve disc sealing surface contact with the valve body sealing surface.

2. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The connection mode of the deflector cover and the valve body is threaded connection or bolt connection.

3. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The deflector may be of streamlined design to reduce fluid resistance.

4. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The deflector cover is installed on the step groove on the outlet side of the valve body, and a four-open ring is designed close to it. The four-open ring is installed from the outlet side end, the four-open ring is clamped in the groove of the valve body, and then screws are used to fasten it to the deflector cover. Under the thrust of the medium, the deflector cover will not withdraw from the outlet end.

5. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The guide sleeve is connected to the guide cover by threading and spot-welded to prevent rotation. The guide sleeve cooperates with the guide rod to guide the valve flap to open and close at the correct position.

6. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The guide rod is of one-piece or two-piece type.

7. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: The inner hole of the guide sleeve is built-up with hard alloy, so that the hardness and service life of the scraping angle formed are improved.

8. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: A fixing pin is arranged in the guide sleeve at the deflector cover, which cooperates with the valve disc guide rod to prevent the valve disc from rotating. A second slot is opened on the guide rod that cooperates with the guide sleeve at the end of the deflector cover, which serves as a movement path of the pin during the sliding process of the guide rod, and is used to prevent radial rotation of the guide rod and thus prevent radial rotation of the valve disc.

9. The axial flow check valve for high pressure hydrogenation according to claim 1, characterized in that: Lifting ears and supporting legs are arranged on the valve body to facilitate the lifting and stable placement of the valve.

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