Novel underwater hydraulic valve

Abstract

The utility model discloses a novel underwater hydraulic valve which comprises a cylinder body, a piston is arranged in the cylinder body, a piston ejector rod is vertically arranged on the piston, the upper end of the piston ejector rod axially penetrates through an upper cylinder cover, a connecting flange is arranged above the upper cylinder cover, and a connecting rod is vertically arranged in the connecting flange. A valve assembly is arranged below the cylinder body and comprises a valve shell, a valve rod and a valve plate are vertically arranged in the valve shell, the upper end of the valve rod is fixedly connected with the bottom of the piston, the lower end of the valve rod is fixedly connected with the valve plate, and a fluid channel is formed in the valve shell. A lower cylinder cover is arranged at the bottom of the cylinder body, a cavity is formed in the cylinder body, the piston is located in the cavity, and a driving through hole is formed in the upper cylinder cover and communicated with the cavity. The novel underwater hydraulic valve is reliable in sealing, small in size, light in weight and capable of preventing sand, and safety and reliability of underwater oil and gas development are improved.

Description

Technical Field

[0001] This utility model relates to a novel underwater hydraulic valve, belonging to the technical field of valve devices used in underwater environments. Background Technology

[0002] Subsea hydraulic valves are used in subsea systems such as subsea manifolds, subsea oil and gas development wellheads, and subsea water injection systems to allow or cut off fluid flow. They can be switched in two ways: hydraulic control and ROV linear control.

[0003] Traditional underwater hydraulic valves have unreliable sealing performance, are large in size and weight, and have poor sand-proofing effect, which makes them prone to jamming. Underwater is different from land, and the repair cost and time are high when underwater products have accidents. Therefore, underwater valves must be reliable and have a service life of more than 20 years. Ordinary inventions can hardly meet the above requirements. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of underwater hydraulic valve. This new type of underwater hydraulic valve has reliable sealing, small size and light weight, and can prevent sand, thereby improving the safety and reliability of underwater oil and gas development.

[0005] To solve the above-mentioned technical problems, the present invention provides a novel underwater hydraulic valve, comprising a cylinder body, a piston disposed within the cylinder body, a piston rod vertically disposed on the piston, an upper cylinder cover disposed at the upper part of the cylinder body, the upper cylinder cover being located above the piston, the upper end of the piston rod axially passing through the upper cylinder cover, a connecting flange disposed above the upper cylinder cover, a connecting rod vertically disposed within the connecting flange, the lower end of the connecting rod being fixedly connected to the upper end of the piston rod, and a valve assembly disposed below the cylinder body, the valve assembly comprising a valve housing, within which a piston rod is vertically disposed... The valve body comprises a valve stem and a valve plate. The upper end of the valve stem is fixedly connected to the bottom of the piston, and the lower end of the valve stem is fixedly connected to the valve plate. A valve cover is provided on the top of the valve body, which is located below the piston and is sealed to the cylinder. A fluid channel is provided inside the valve body, and the lower end of the valve plate points to the fluid channel. When the valve plate moves downward into the fluid channel, it seals the fluid channel. A lower cylinder cover is provided at the bottom of the cylinder. The cylinder has a cavity, and the piston is located in the cavity. A drive through hole is provided on the upper cylinder cover, which opens at the top of the upper cylinder cover and communicates with the cavity.

[0006] Preferably, the cylinder body is provided with multi-layer disc springs, which are located between the upper cylinder head and the lower cylinder head.

[0007] Preferably, a portion of the multi-layer disc spring is fitted onto the piston.

[0008] Preferably, the upper cylinder head is sealed to the connecting flange.

[0009] Preferably, the upper cylinder head is sealed to the cylinder body.

[0010] Preferably, the top of the upper cylinder head is provided with a compensation port, which is in communication with the piston.

[0011] Preferably, the upper cylinder head is sealed to the piston rod.

[0012] Preferably, the valve body is provided with a valve core, the valve core is located at the fluid passage, and a sealing ring is provided between the valve core and the valve body.

[0013] Preferably, an axial sealing valve seat is provided between the valve core and the valve plate.

[0014] Preferably, the connecting rod is provided with a valve position indicator.

[0015] The beneficial effects of this utility model are: the novel underwater hydraulic valve of this utility model has reliable sealing, small size and light weight, can prevent sand, improves the safety and reliability of underwater oil and gas development, has a long service life, is suitable for the needs of underwater oil and gas extraction, and can be forcibly opened with the help of tools in emergency situations to ensure the safety of underwater oil and gas development. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a structural schematic cross-sectional view of the novel underwater hydraulic valve of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the novel underwater hydraulic valve of this utility model in an embodiment;

[0019] Figure 3 This is a partial structural schematic cross-sectional view of the novel underwater hydraulic valve of this utility model. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Embodiment of this utility model:

[0022] This utility model provides a novel underwater hydraulic valve. Please refer to [link / reference]. Figures 1 to 3 The system includes a cylinder body 1, a piston 2 disposed inside the cylinder body 1, a piston rod 3 vertically disposed on the piston 2, an upper cylinder cover 4 disposed at the upper part of the cylinder body 1, the upper cylinder cover 4 being located above the piston 2, the upper end of the piston rod 3 axially passing through the upper cylinder cover 4, a connecting flange 5 disposed above the upper cylinder cover 4, a connecting rod 6 vertically disposed inside the connecting flange 5, the connecting rod 6 being able to move up and down within the connecting flange 5 under the action of external force, the lower end of the connecting rod 6 being fixedly connected to the upper end of the piston rod 3, and a valve assembly 7 disposed below the cylinder body 1, the valve assembly 7 including a valve housing 71, a valve stem 72 and a valve plate 73 vertically disposed inside the valve housing 71, the upper end of the valve stem 72 being connected to the upper end of the piston rod 3. The bottom of piston 2 is fixedly connected, the lower end of valve stem 72 is fixedly connected to valve plate 73, valve cover 74 is provided on the top of valve housing 71, valve cover 74 is located below piston 2, valve cover 74 is sealed to cylinder body 1, fluid channel 75 is provided inside valve housing 71, the lower end of valve plate 73 points to fluid channel 75, valve plate 73 seals fluid channel 75 when it moves down into fluid channel 75, lower cylinder cover 8 is provided at the bottom of cylinder body 1, cylinder body 1 has cavity 9 inside, piston 2 is located in cavity 9, drive through hole 10 is provided on upper cylinder cover 4, drive through hole 10 opens at the top of upper cylinder cover 4, drive through hole 10 communicates with cavity 9.

[0023] Preferably, the cylinder body 1 is provided with a multi-layer disc spring 11, which is located between the upper cylinder head 4 and the lower cylinder head 8. Using a disc spring design instead of a traditional cylindrical spring design can reduce the overall size of the valve, making the valve structure compact and the valve closing time shorter.

[0024] Preferably, a portion of the multi-layer disc spring 11 is fitted onto the piston 2, that is, the upper portion of the multi-layer disc spring 11 is fitted onto the piston 2.

[0025] Preferably, the upper cylinder head 4 and the connecting flange 5 are sealed using a combination of PTFE (polytetrafluoroethylene) and HNBR (hydrogenated nitrile butadiene rubber) materials, which has good oil resistance and extends the service life of the seal.

[0026] Preferably, the upper cylinder head 4 is sealed to the cylinder body 1. The seal here is a combination of PTFE (polytetrafluoroethylene) and HNBR (hydrogenated nitrile butadiene rubber), which has good oil resistance and extends the service life of the seal.

[0027] Preferably, the top of the upper cylinder head 4 is provided with a compensation port 12, which is connected to the piston 2. When working underwater, such as on the seabed, hydraulic oil pressure is injected through the compensation port 12 to compensate for the seabed pressure and reduce the valve pressure.

[0028] Preferably, the upper cylinder head 4 is sealed to the piston rod 3, and the valve rod 72 is sealed to the lower cylinder head 8.

[0029] Preferably, the valve housing 71 is provided with a valve core 76, which is located at the fluid channel 75. A sealing ring 77 is provided between the valve core 76 and the valve housing 71. The sealing ring 77 is made of elastic non-metallic material. When the valve plate 73 floats left and right, the sealing ring 77 can keep the valve core 76 and the valve housing 71 in a filled state through the elastic compression and expansion compensation, thereby achieving the sand prevention effect.

[0030] Preferably, an axial sealing valve seat 78 is provided between the valve core 76 and the valve plate 73. The axial sealing valve seat enables the valve to have a stable front sealing effect at low pressure, and avoids the sealing instability caused by the unstable gap between the valve core 76 and the valve plate 73 due to the floating of the valve plate 73 at high pressure.

[0031] Preferably, the connecting rod 6 is provided with a valve position indicator 13. When the connecting rod 6 moves up and down, it drives the valve position indicator 13 to move up and down, so that the valve can be observed underwater to see whether it is open or closed.

[0032] In operation, this novel underwater hydraulic valve is operated by injecting hydraulic oil through the drive through-hole 10, which drives the piston 2 downwards, causing the valve stem 72 and valve plate 73 to move downwards. The upper part of the valve plate 73 is hollowed out, exposing the fluid passage 75, thus opening the valve. At this time, the multi-layer disc spring 11 is under pressure. The drive through-hole 10 is then fracturing to release the hydraulic oil. The multi-layer disc spring 11 recovers its elasticity and, relying on its rebound force, moves upwards, causing the piston 2 to move upwards. This, in turn, causes the valve plate 73 and valve stem 72 to move upwards, closing the valve. The valve plate 73 then blocks the fluid passage 75. Simultaneously, the valve can also be forcibly opened by moving the connecting rod 6 upwards using an ROV tool. The connecting rod 6 drives the piston rod 3 and piston 2 upwards, which in turn moves the valve plate 73 and valve stem 72 upwards, allowing the valve to open forcefully in emergency situations, ensuring the safety of underwater oil and gas development. Throughout the process, hydraulic oil is injected into the compensation port 12 and pumped at a pressure equal to the water depth, achieving pressure compensation and improving the valve's service life.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A new type of underwater hydraulic valve, comprising a cylinder, a piston is arranged in the cylinder, a piston rod is vertically arranged on the piston, characterized in that, The upper part of the cylinder is provided with an upper cylinder cover, which is above the piston, the upper end of the piston rod axially penetrates the upper cylinder cover, the upper part of the upper cylinder cover is provided with a connecting flange, the connecting flange is vertically provided with a connecting rod, the lower end of the connecting rod is fixedly connected with the upper end of the piston rod, the lower part of the cylinder is provided with a valve assembly, the valve assembly comprises a valve housing, the valve housing is vertically provided with a valve rod and a valve plate, the upper end of the valve rod is fixedly connected with the bottom of the piston, the lower end of the valve rod is fixedly connected with the valve plate, the top of the valve housing is provided with a valve cover, which is below the piston, the valve cover is sealingly connected with the cylinder, the valve housing is provided with a fluid passage, the lower end of the valve plate points to the fluid passage, the valve plate seals the fluid passage when moving downward into the fluid passage, the bottom of the cylinder is provided with a lower cylinder cover, the cylinder has a cavity, the piston is located in the cavity, the upper cylinder cover is provided with a driving through hole, which is opened at the top of the upper cylinder cover, and the driving through hole communicates with the cavity.

2. The new underwater hydraulic valve according to claim 1, characterized in that, The cylinder is provided with a plurality of disc springs, which are located between the upper cylinder cover and the lower cylinder cover.

3. The new underwater hydraulic valve according to claim 2, characterized in that, Part of the plurality of disc springs is sleeved on the piston.

4. The new underwater hydraulic valve according to claim 3, characterized in that, The upper cylinder cover is sealed with the connecting flange.

5. The new underwater hydraulic valve according to claim 4, characterized in that, The upper cylinder cover is sealed with the cylinder.

6. The new underwater hydraulic valve according to claim 5, characterized in that, The top of the upper cylinder cover is provided with a compensation port, which communicates with the piston.

7. The new underwater hydraulic valve according to claim 6, characterized in that, The upper cylinder cover is sealed with the piston rod.

8. The new underwater hydraulic valve according to claim 7, characterized in that, The valve housing is provided with a valve core, which is located at the fluid passage, and a sealing check ring is arranged between the valve core and the valve housing.

9. The new underwater hydraulic valve according to claim 8, characterized in that, An axial sealing valve seat is arranged between the valve core and the valve plate.

10. The new underwater hydraulic valve according to claim 9, characterized in that, The connecting rod is provided with a valve position indicator.

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