Deep sea ball valve with improved valve seat sealing system

Abstract

A deep sea ball valve with an improved valve seat sealing system comprises a valve body, a valve rod, a valve element, a valve seat box and a valve seat matched with the valve element, the valve seat comprises a supporting ring, the supporting ring comprises a sealing face used for being matched with the valve element in a sealing mode, and the sealing face comprises an upper sealing angle and a lower sealing angle. The upper sealing angle is used for supporting the valve element and forms sealing with the valve element, the lower sealing angle is in clearance fit with the valve element when the valve is opened and is in interference fit with the valve element when the valve is closed, compared with one sealing, the upper sealing angle and the lower sealing angle are safer, spherical dirt is wiped away in the opening and closing process of the upper sealing angle, and the sealing effect is better. The lower sealing angle is protected, sealing is more durable, the sealing angle does not make contact with the valve element when the valve is in a normally-open state, the problem of material fatigue is avoided, and the problem of root leakage of an original sealing ring is solved through the integral design that the supporting ring and the sealing face are combined into one.

Description

Technical Field

[0001] The utility model relates to a deep-sea ball valve with an improved valve seat sealing system, belonging to the field of valves. Background Art

[0002] Deep sea ball valve is a ball valve used for opening and closing pipelines in the underwater manifolds, submarine pipeline terminals and oil and gas transmission pipelines of offshore oil and gas projects. It plays a key role in the safe transportation of submarine oil and gas. A deep sea ball valve has been developed. In addition to the advantages of ordinary ball valves such as low fluid resistance, rapid opening and closing, and high reliability, this valve also has the characteristics of corrosion resistance, high pressure resistance, and good sealing.

[0003] At present, ball valves have been widely used in many industries such as electricity, hydraulic power, petrochemical, metallurgy, etc., and various problems have also emerged. The first problem to be solved is to ensure that the overall sealing effect of the ball valve is improved in the depths of the ocean.

[0004] 1. The normal operating life of deep-sea ball valves is 20 to 40 years without maintenance. The installation depth ranges from 200 meters to 4,000 meters, and is operated by unmanned remote-controlled submersibles. The deep-sea valve seat seal requires zero leakage. Conventional deep-sea ball valve seals use metal-to-metal seals or metal-to-engineering plastic seals. The compensation of the seal pair is small and the adaptability to fluctuating environments is poor.

[0005] 2. Metal materials and engineering plastics have a certain toughness, but the toughness is small, and a larger sealing force is required to meet the zero leakage requirement.

[0006] 3. The valve seat support ring is usually made of metal material, and the gap between it and the valve seat box is small. The valve is easily stuck and leaks under the action of waves and earthquakes. Utility Model Content

[0007] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide a deep-sea ball valve with an improved valve seat sealing system.

[0008] The invention relates to a deep-sea ball valve with an improved valve seat sealing system, comprising a valve body, a valve stem, a valve core, a valve seat box and a valve seat matched with the valve core, the valve seat comprising a supporting ring, the supporting ring comprising a sealing surface for matching and sealing with the valve core, the sealing surface comprising an upper sealing angle and a lower sealing angle, the upper sealing angle being used to support the valve core and form a seal with the valve core, the lower sealing angle being matched with the valve core clearance when the valve is opened, and being interference matched with the valve core when the valve is closed, the two seals of the upper sealing angle and the lower sealing angle are safer than one seal, the upper sealing angle wipes off the dirt on the ball surface during the opening and closing process, protects the lower sealing angle, and the seal is more durable, the sealing angle does not contact the valve core when the valve is normally open, thus avoiding the problem of material fatigue, and the integral design of the supporting ring and the sealing surface as one solves the problem of leakage at the root of the original sealing ring.

[0009] Furthermore, the upper sealing angle and the lower sealing angle are connected in an arc, leaving a gap for grease injection, and increasing the elasticity between the upper sealing angle and the lower sealing angle, which is beneficial to enhancing the sealing performance and practicality.

[0010] Preferably, a through connecting hole is provided between the upper sealing angle and the lower sealing angle, one end of the connecting hole is connected to the valve seat box, and the other end extends to the arc connection between the upper sealing angle and the lower sealing angle. If both seals are destroyed when the valve is closed, a small amount of sealing grease can be injected into the closed ring between the two sealing angles through the connecting hole to achieve effective sealing.

[0011] Preferably, a spring is provided on the valve seat box, and the other end of the spring abuts against the valve seat to provide a thrust for the valve seat to approach the valve core; a horizontally arranged first skeleton and a second skeleton are provided in the support ring, and the first skeleton is cylindrical and is arranged on the outside of the lower sealing angle. The first skeleton and the second skeleton increase the strength of the support ring, which is beneficial to improving the service life and use effect of the product and maintaining a stable working state in a complex environment.

[0012] Preferably, the second skeleton is cylindrical with a bottom plane and is arranged outside the upper sealing angle. The bottom plane of the second skeleton abuts against the spring on the valve seat box. The bottom plane of the second skeleton isolates the spring and the PEEK plane to prevent the spring from scratching the PEEK plane, thereby improving the use effect and service life.

[0013] Furthermore, the support ring is made of PEEK engineering plastic. PEEK has a certain toughness. During waves or earthquakes, PEEK can deform synchronously with the valve body, solving the problem of the valve seat support ring and the valve seat box being stuck to each other, and reducing replacement and maintenance costs.

[0014] Furthermore, a U-shaped elastic groove close to the valve core is provided on one side of the lower sealing angle. The U-shaped elastic groove provides a larger elastic compensation for the lower sealing angle, and a smaller sealing force can achieve zero leakage. Since the sealing force becomes smaller, the corresponding opening and closing torque also has a smaller deformation. When selecting an actuator, the specifications can be appropriately reduced, and the product is more economical.

[0015] Preferably, the support ring is provided with a first sealing ring and a second sealing ring abutting against the valve seat box, which are used to seal with the valve seat box to prevent fluid from entering the valve seat box and causing the internal spring to rust and oxidize, thereby affecting the use effect.

[0016] The beneficial effects of the utility model are as follows: the two seals through the upper sealing corner and the lower sealing corner are safer than one seal, the upper sealing corner wipes off the dirt on the spherical surface during the opening and closing process, protects the lower sealing corner, and the seal is more durable. The sealing angle does not contact the valve core when the valve is normally open, avoiding the problem of material fatigue, and the integral design of the support ring and the sealing surface solves the problem of leakage at the root of the original sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is an enlarged view of the details of the support ring in the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model when the valve is in an open state;

[0021] Figure 4 This is a schematic diagram of the structure of the utility model when the valve is in a closed state;

[0022] Figure 5 This is a schematic diagram of the structure of the valve in the utility model when it is in the grease injection state;

[0023] In the figure, 1, valve body; 2, valve stem; 3, valve core; 4, valve seat box; 41, spring; 5, support ring; 51, sealing surface; 511, upper sealing angle; 512, lower sealing angle; 52, connecting hole; 53, first skeleton; 54, second skeleton; 541, bottom plane; 55, U-shaped elastic groove; 56, first sealing ring; 57, second sealing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0025] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0026] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0027] like Figure 1-5 As shown, an embodiment of a deep-sea ball valve with an improved valve seat sealing system of the utility model comprises a valve body 1, a valve stem 2, a valve core 3, a valve seat box 4 and a valve seat matched with the valve core 3, the valve seat comprises a support ring 5, the support ring 5 comprises a sealing surface 51 for matching and sealing with the valve core 3, the sealing surface 51 comprises an upper sealing angle 511 and a lower sealing angle 512, the upper sealing angle 511 is used to support the valve core 3 and form a seal with the valve core 3, the lower sealing angle 512 is clearance matched with the valve core 3 when the valve is opened, and is interference matched with the valve core 3 when the valve is closed, the two seals of the upper sealing angle 511 and the lower sealing angle 512 are safer than one seal, the upper sealing angle 511 wipes off the dirt on the ball surface during the opening and closing process, protects the lower sealing angle 512, and the seal is more durable, the sealing angle 512 does not contact the valve core 3 when the valve is normally open, thereby avoiding the problem of material fatigue, and the integral design of the support ring 5 and the sealing surface 51 as one solves the problem of leakage at the root of the original sealing ring.

[0028] The upper sealing corner 511 and the lower sealing corner 512 are connected in an arc, leaving a gap for grease injection, and increasing the elasticity between the upper sealing corner 511 and the lower sealing corner 512, which is beneficial to enhancing the sealing performance and practicality.

[0029] A through connection hole 52 is provided between the upper sealing angle 511 and the lower sealing angle 512. One end of the connection hole 52 is connected to the valve seat box 4, and the other end extends to the arc connection between the upper sealing angle 511 and the lower sealing angle 512. If both seals are damaged in the valve closed state, a small amount of sealing grease can be injected into the closed ring between the two sealing angles through the connection hole 52 to achieve effective sealing. A grease injection valve connected to the valve seat box 4 is provided on the valve body 1 for grease injection sealing when the upper sealing angle 511 and the lower sealing angle 512 fail.

[0030] The valve seat box 4 is provided with a spring 41, and the other end of the spring 41 abuts against the valve seat to provide a thrust for the valve seat to approach the valve core 3; the support ring 5 is provided with a horizontally arranged first skeleton 53 and a second skeleton 54, and the first skeleton 53 is cylindrical and is arranged on the outside of the lower sealing corner 512. The first skeleton 53 and the second skeleton 54 increase the strength of the support ring 5, which is beneficial to improving the service life and use effect of the product and maintaining a stable working state in a complex environment.

[0031] The second skeleton 54 is cylindrical with a bottom plane 541 and is arranged on the outside of the upper sealing angle 511. The bottom plane 541 of the second skeleton 54 abuts against the spring 41 on the valve seat box 4. The bottom plane 541 of the second skeleton isolates the spring 41 and the PEEK plane to prevent the spring 41 from scratching the PEEK plane, thereby improving the use effect and service life.

[0032] The support ring 5 is made of PEEK engineering plastics, which has a certain toughness. When there are waves or earthquakes, PEEK can be deformed synchronously with the valve body 1, solving the problem of the valve seat support ring 5 and the valve seat box 4 being stuck to each other, and reducing the replacement cost and maintenance cost. In addition to PEEK materials, other special engineering plastics such as PPS, PI, PSF and other materials with stability and toughness can also be used.

[0033] A U-shaped elastic groove 55 close to the valve core 3 is provided on one side of the lower sealing angle 512. The U-shaped elastic groove 55 provides a larger elastic compensation for the lower sealing angle 512. A smaller sealing force can achieve zero leakage. Since the sealing force becomes smaller, the corresponding opening and closing torque also has a smaller deformation. When selecting an actuator, the specifications can be appropriately reduced, and the product is more economical.

[0034] The support ring 5 is provided with a first sealing ring 56 and a second sealing ring 57 which abut against the valve seat box 4 and are used to seal with the valve seat box 4 to prevent the fluid from entering the valve seat box 4 and causing the internal spring 41 to rust and oxidize, thereby affecting the use effect.

[0035] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

[0036] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A deep-sea ball valve with an improved valve seat sealing system, characterized in that: It includes a valve body, a valve stem, a valve core, a valve seat box and a valve seat that cooperates with the valve core, the valve seat includes a support ring, the support ring includes a sealing surface for cooperating and sealing with the valve core, the sealing surface includes an upper sealing angle and a lower sealing angle, the upper sealing angle is used to support the valve core and form a seal with the valve core, the lower sealing angle is in clearance cooperation with the valve core when the valve is open, and is in interference cooperation with the valve core when the valve is closed.

2. The deep sea ball valve with improved valve seat sealing system as claimed in claim 1, characterized in that: The upper sealing corner and the lower sealing corner are connected in an arc.

3. The deep sea ball valve with improved valve seat sealing system as claimed in claim 2, characterized in that: A through connection hole is provided between the upper sealing angle and the lower sealing angle, one end of the connection hole is communicated with the valve seat box, and the other end extends to the arc connection between the upper sealing angle and the lower sealing angle.

4. The deep sea ball valve with improved valve seat sealing system as claimed in claim 1, characterized in that: A spring is provided on the valve seat box, and the other end of the spring abuts against the valve seat to provide a thrust for the valve seat to approach the valve core; a first frame and a second frame are horizontally arranged in the support ring, and the first frame is cylindrical and arranged outside the lower sealing angle.

5. The deep sea ball valve with improved valve seat sealing system as claimed in claim 4, characterized in that: The second frame is cylindrical with a bottom plane and is arranged outside the upper sealing angle. The bottom plane of the second frame abuts against the spring on the valve seat box.

6. The deep-sea ball valve with improved valve seat sealing system as claimed in claim 1 or 4, characterized in that: The supporting ring is made of PEEK engineering plastics.

7. The deep sea ball valve with improved valve seat sealing system as claimed in claim 1, characterized in that: A U-shaped elastic groove close to the valve core is provided on one side of the lower sealing angle.

8. The deep sea ball valve with improved valve seat sealing system as claimed in claim 1, characterized in that: The support ring is provided with a first sealing ring and a second sealing ring which abut against the valve seat box.

Images