Sea valve capable of being quickly disassembled

Abstract

The utility model discloses a quickly-disassembled sea valve which comprises a barrel body, a valve seat mounting seat welded at the bottom of the barrel body, a detachable conical valve seat, an upper flange cover assembly, a valve rod assembly, a packing pressing cap and packing. The conical valve seat is fixed with the valve seat mounting seat in a friction manner through a conical surface, is provided with a lightening hole, and is matched with a special valve puller to realize non-destructive disassembly and replacement; the valve rod assembly bidirectionally adjusts the sealing pressing force of the rubber valve plate through an upper adjusting nut and a lower adjusting nut to dynamically compensate abrasion; the upper flange cover assembly is integrated with a deflation valve and a T-shaped plate which are respectively used for balancing the pressure difference of the barrel and enhancing the structural rigidity; and the packing is quickly maintained through a packing pressing cap and a special wrench. The subsea valve solves the defects that a valve seat of an existing subsea valve cannot be disassembled in welding, the sealing adjusting range is limited, and the maintenance cost is high, has the comprehensive advantages of rapid modular replacement, sealing self-adaption compensation and safe and reliable operation, and is suitable for efficient operation and maintenance of a drilling fluid circulation system.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum drilling and production equipment technical field, concretely is a quick dismounting subsea valve. BACKGROUND

[0002] The mud tank is an important component of the oil solid control system, and its function is to configure, circulate and reserve drilling fluid. The drilling fluid carries the cuttings back to the ground, and the cuttings in the drilling fluid are purified through the purification equipment such as the vibrating screen, the sand remover, the mud remover and the centrifuge, and the purified drilling fluid flows into the drilling fluid tank to be recycled by the drilling pump. The subsea valve is an opening and closing valve on the mud pump suction pipeline of each bin, and its main function is to provide drilling fluid for the mud pump and control the circulation pipeline of the mud tank and each bin.

[0003] The existing subsea valve has the following defects:

[0004] Firstly, the valve seat and the cylinder of the subsea valve are directly welded together. When the valve core of the subsea valve works for a long time, the sealing rubber plate is seriously worn. If the sealing rubber plate is not replaced in time, the upper pressing plate will damage the valve seat, resulting in the sealing failure of the subsea valve. When the valve seat needs to be replaced, the cylinder valve seat part must be cut off to replace it, which consumes a long time, has low work efficiency and high maintenance cost.

[0005] Secondly, the valve rod of the subsea valve is usually designed to be relatively long, and only the upper end is reserved with an adjusting screw, so the adjusting range is short. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a quick dismounting subsea valve with a valve seat that can be quickly dismounted and bidirectional sealing adjustment, so as to solve the problems in the background technology.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a quick dismounting subsea valve, including cylinder, the valve seat mounting seat of welding in the bottom of cylinder, the conical seat of detachable installation on the conical seat mounting seat, the upper flange cover assembly of setting in the upper portion of cylinder, the valve stem assembly of penetrating cylinder and with upper flange cover assembly connection, and packing pressure cap and packing, cylinder bottom welding in the bottom of mud tank, and its lateral wall is equipped with drilling fluid inlet, the conical seat mounting seat is sealedly connected with conical seat through taper face, and conical seat is fixed on the conical seat mounting seat through special valve puller, upper flange cover assembly includes upper flange plate, packing installation box fixedly connected with cylinder through bolt, T-shaped plate, inner frame, crank articulated in inner frame, handle connected with crank, and the deflation valve of setting in upper flange plate, valve stem assembly contains valve stem, rubber valve plate fixed in the lower end of valve stem, adjusting nut, valve stem fixing block are arranged respectively in the upper and lower ends of valve stem, and the upper pressing plate and lower pressing plate of fixing rubber valve plate through bolt, the crank is driven reverse rotation through handle, drives valve stem assembly to move up and down, realizes the sealing or separation of rubber valve plate and conical seat, packing is installed in packing installation box, and is sealedly pressed through packing pressure cap, and packing pressure cap is fixedly screwed through special packing pressure cap wrench.

[0008] Preferably, the upper and lower end faces of the conical seat are provided with taper faces, the upper taper face is in sealing contact with the rubber valve plate, the lower taper face is frictionally fixed with the valve seat mounting seat, and the middle part of the conical seat is provided with a weight-reducing hole, so as to facilitate dismounting and replacing the conical seat from the upper part of the cylinder through the special valve puller.

[0009] Preferably, the upper and lower ends of the valve stem are provided with adjusting screws, and the position of the rubber valve plate can be adjusted in two directions through the adjusting nuts, so as to adapt to different sealing wear conditions.

[0010] Preferably, the deflation valve is arranged on the lateral wall of the upper flange plate, is used for balancing the pressure difference between the inside and outside of the cylinder, and reduces the operation resistance of the valve stem.

[0011] Preferably, the T-shaped plate is welded between the upper flange plate and the inner frame, and is used for enhancing the structural stability of the upper flange cover assembly.

[0012] Preferably, the valve stem fixing block is fixedly connected with the upper end of the valve stem through screw threads, and is bolt-connected with the inner frame, so as to realize the rigid fixing of the valve stem assembly and the upper flange cover assembly.

[0013] Preferably, the upper and lower pressing plates clamp the rubber valve plate through bolts, and form a detachable sealing structure, so as to facilitate replacing the worn valve plate.

[0014] Preferably, the packing pressure cap wrench is a hexagonal special tool, the inner hole of which is matched with the shape of the outer edge of the packing pressure cap, and is used for quickly screwing or dismounting the packing pressure cap.

[0015] Preferably, the valve stem assembly further comprises a centralizer welded to both ends of the valve stem for limiting radial displacement of the valve stem.

[0016] The working process of the utility model is:

[0017] The valve opening and closing control process: the operator drives the valve stem assembly to move up and down along the inner cavity of the cylinder by rotating the handle and driving the crank to reverse. When the valve stem moves down, the rubber valve plate fixed to the lower end thereof closely abuts against the upper conical surface of the conical valve seat, realizing valve sealing. When the handle is reversely rotated, the valve stem moves up, the rubber valve plate is separated from the conical valve seat, the valve is opened, and the drilling fluid enters the circulating pipeline through the liquid inlet of the cylinder side wall.

[0018] The sealing adjustment and compensation process: when the sealing effect of the rubber valve plate is reduced due to long-term wear, the position of the rubber valve plate is adjusted in two directions by adjusting the adjusting nuts at both ends of the valve stem. The upper adjusting nut drives the valve stem fixed block to press down, the lower adjusting nut pushes the lower pressing plate to move up, so that the rubber valve plate closely abuts against the conical surface of the conical valve seat again, and the sealing performance is restored.

[0019] The valve seat quick dismounting and replacing process: when the conical valve seat needs to be replaced due to wear, the packing gland pressure cap is disassembled and rotated loose by using a special packing gland pressure cap wrench, the packing and the upper flange cover assembly are removed, the valve stem assembly is lifted to the upper part of the cylinder, the conical valve seat is exposed, the old valve seat is pulled out vertically upward by using a special valve extractor hooked on the weight reduction hole of the valve seat. The new conical valve seat is embedded from the upper part of the cylinder and is fixed by friction between the conical surface and the valve seat mounting seat, and the cylinder does not need to be cut or welded during the whole process.

[0020] The utility model has the advantages that:

[0021] (1) In the utility model, the conical valve seat is detachably connected with the valve seat mounting seat through the conical surface, and is provided with a weight reduction hole matched with a special valve extractor, so that the cylinder does not need to be cut or welded during replacement, the damage to the tank structure during maintenance is significantly reduced, the downtime is shortened, and the maintenance cost is saved.

[0022] (2) In the utility model, the adjusting nuts are arranged at both ends of the valve stem, the pressing force of the rubber valve plate can be adjusted in two directions, the wear of the sealing surface can be compensated in real time, the service life of the valve is prolonged, the sealing surface tolerance of different mud tanks is matched, and the system compatibility is improved.

[0023] (3) In the utility model, the conical valve seat and the packing are designed in a modular manner, and are dismounted non-destructively by using a special tool, so that the downtime is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of a submarine valve assembly;

[0025] Figure 2 It is a schematic view of an upper flange cover assembly;

[0026] Figure 3 is a valve rod assembly sectional view;

[0027] Figure 4 is a conical valve seat structure view;

[0028] In the figure: 1, packing gland; 2, packing; 3, upper flange cover assembly; 3-1, upper flange plate; 3-2, packing installation box; 3-3, T-shaped plate; 3-4, inner frame; 3-5, crank; 3-6, handle; 3-7, air release valve; 4, valve rod assembly; 4-1, adjusting nut; 4-2, valve rod fixing block; 4-3, valve rod; 4-4, centralizing plate; 4-5, upper pressing plate; 4-6, rubber valve plate; 4-7, lower pressing plate; 5, cylinder body; 6, packing gland wrench; 7, conical valve seat; 8, valve seat installation seat. DETAILED DESCRIPTION

[0029] The utility model will be further explained in detail in connection with the drawings.

[0030] As Figures 1-4 shown in a kind of quick disassembly subsea valve, including cylinder body 5, the valve seat installation seat 8 welded in the bottom of cylinder body 5, the conical valve seat 7 detachably installed on valve seat installation seat 8, the upper flange cover assembly 3 being set to the upper portion of cylinder body 5, the valve rod assembly 4 being passed through cylinder body 5 and being connected with upper flange cover assembly 3, and packing gland 1 and packing 2;Cylinder body 5 is welded in the bottom of mud pot, and the lateral wall is equipped with drilling fluid inlet;The valve seat installation seat 8 is connected with conical valve seat 7 by taper surface sealing, and conical valve seat 7 is fixed on valve seat installation seat 8 by special valve puller;Upper flange cover assembly 3 includes upper flange plate 3-1, packing installation box 3-2 fixedly connected with cylinder body 5 by bolt, T-shaped plate 3-3, inner frame 3-4, crank 3-5 articulated in inner frame 3-4, handle 3-6 connected with crank 3-5, and air release valve 3-7 being set on upper flange plate 3-1;Valve rod assembly 4 includes valve rod 4-3, rubber valve plate 4-6 fixed in the lower end of valve rod 4-3, adjusting nut 4-1, valve rod fixing block 4-2 being set in the upper and lower ends of valve rod 4-3 respectively, and upper pressing plate 4-5 and lower pressing plate 4-7 fixed rubber valve plate 4-6 by bolt;Crank 3-5 is driven to reverse by handle 3-6, drives valve rod assembly 4 to move up and down, realizes the sealing or separation of rubber valve plate 4-6 and conical valve seat 7;Packing 2 is installed in packing installation box 3-2, and is tightly sealed by packing gland 1, and packing gland 1 is fixed by special packing gland wrench 6.

[0031] The upper and lower end faces of the conical valve seat 7 are provided with conical faces, the upper end conical face is in sealing contact with the rubber valve plate 4-6, the lower end conical face is in frictional fixation with the valve seat mounting seat 8, and the middle part of the conical valve seat 7 is provided with a weight-reducing hole, so that the conical valve seat 7 can be conveniently disassembled and replaced from the upper part of the cylinder body 5 by using a special valve pulling device. The upper and lower ends of the valve rod 4-3 are provided with adjusting screws, and the position of the rubber valve plate 4-6 can be bidirectionally adjusted by adjusting the adjusting nuts 4-1, so as to adapt to different sealing wear conditions. The gas discharge valve 3-7 is arranged on the side wall of the upper flange plate 3-1, is used for balancing the pressure difference between the inside and outside of the cylinder body 5, and reduces the operation resistance of the valve rod 4-3.

[0032] The T-shaped plate 3-3 is welded between the upper flange plate 3-1 and the inner frame 3-4, and is used for enhancing the structural stability of the upper flange cover assembly 3.

[0033] The valve rod fixing block 4-2 is fixed on the upper end of the valve rod 4-3 through threaded connection, and is bolted with the inner frame 3-4, so as to realize the rigid fixation of the valve rod assembly 4 and the upper flange cover assembly 3.

[0034] The upper pressing plate 4-5 and the lower pressing plate 4-7 clamp the rubber valve plate 4-6 through bolts, so as to form a detachable sealing structure, and the worn valve plate can be conveniently replaced.

[0035] The packing pressing cap wrench 6 is a special hexagonal tool, the inner hole of the packing pressing cap wrench 6 is matched with the outer edge shape of the packing pressing cap 1, and is used for quickly screwing or disassembling the packing pressing cap 1.

[0036] The valve rod assembly 4 further comprises the righting plates 4-4 welded on the upper and lower ends of the valve rod 4-3, and is used for limiting the radial deviation of the valve rod 4-3.

[0037] The working process of the utility model is as follows:

[0038] The valve opening and closing control process is as follows: the operator drives the valve rod assembly 4 to move up and down along the inner cavity of the cylinder body 5 by rotating the handle 3-6 to drive the crank 3-5 to reverse. When the valve rod 4-3 moves downward, the rubber valve plate 4-6 fixed on the lower end thereof is closely attached to the upper end conical face of the conical valve seat 7, so as to realize valve sealing. When the handle 3-6 is reversely rotated, the valve rod 4-3 moves upward, the rubber valve plate 4-6 is separated from the conical valve seat 7, the valve is opened, and the drilling fluid enters the circulating pipeline through the liquid inlet of the side wall of the cylinder body 5.

[0039] The sealing adjustment and compensation process is as follows: when the sealing effect of the rubber valve plate 4-6 is reduced due to long-term wear, the position of the rubber valve plate 4-6 is bidirectionally adjusted by adjusting the adjusting nuts 4-1 on the upper and lower ends of the valve rod 4-3. The upper adjusting nut 4-1 drives the valve rod fixing block 4-2 to press downward, the lower adjusting nut 4-1 drives the lower pressing plate 4-7 to move upward, so that the rubber valve plate 4-6 is closely attached to the conical face of the conical valve seat 7 again, and the sealing performance is restored.

[0040] Valve seat quick disassembly and replacement process: when the cone valve seat 7 is worn and needs to be replaced, the packing gland cap 1 is disassembled, the special packing gland cap wrench 6 is used to unscrew, the packing 2 and the upper flange cover assembly 3 are removed. The valve rod assembly 4 is lifted to the upper part of the cylinder 5, the cone valve seat 7 is exposed, the special valve extractor is hooked on the weight reduction hole of the valve seat, and the old valve seat is pulled out vertically upward. The new cone valve seat 7 is embedded from the upper part of the cylinder 5, and is frictionally fixed with the valve seat mounting seat 8 through the conical surface, without cutting or welding the cylinder in the whole process.

[0041] In summary, the utility model is suitable for petroleum drilling, ocean engineering and other fields, significantly improves the maintenance efficiency and sealing reliability of the subsea valve, and reduces the operation cost.

[0042] The above is only the preferred example of the utility model. It should be pointed out that for ordinary skilled persons in the art, under the technical inspiration provided by the utility model, as the public knowledge in the mechanical field, other equivalent variants and improvements can also be made, which should also be regarded as the protection scope of the utility model.

Claims

1. A quick disconnect subsea valve, characterized by, The utility model relates to a kind of cone valve seat and valve stem assembly, including: Cylinder (5), the valve seat mounting seat (8) welded in the bottom of cylinder (5), the conical valve seat (7) detachably mounted on the valve seat mounting seat (8), the upper flange cover assembly (3) is set in the upper portion of cylinder (5), the valve stem assembly (4) is connected with the upper flange cover assembly (3) and is passed through cylinder (5), and packing gland (1) and packing (2); The bottom of the cylinder (5) is welded to the bottom of the mud tank, and the sidewall is provided with a drilling fluid inlet; the valve seat mounting seat (8) is connected with the conical valve seat (7) through a conical surface, and the conical valve seat (7) is fixed on the valve seat mounting seat (8) through a special valve puller. The upper flange cover assembly (3) includes an upper flange plate (3-1), a packing installation box (3-2) fixedly connected with the cylinder (5) by bolts, a T-shaped plate (3-3), an inner frame (3-4), a crank (3-5) hingedly connected to the inner frame (3-4), a handle (3-6) connected with the crank (3-5), and a gas release valve (3-7) arranged on the upper flange plate (3-1). The valve stem assembly (4) includes a valve stem (4-3), a rubber valve plate (4-6) fixed to the lower end of the valve stem (4-3), an adjusting nut (4-1) arranged on the upper and lower ends of the valve stem (4-3) respectively, a valve stem fixing block (4-2), and an upper pressing plate (4-5) and a lower pressing plate (4-7) for fixing the rubber valve plate (4-6) by bolts. The crank (3-5) is driven to reverse by the handle (3-6), which drives the valve stem assembly (4) to move up and down, and realizes the sealing or separation of the rubber valve plate (4-6) and the conical valve seat (7). The packing (2) is installed in the packing installation box (3-2), and is tightly sealed by the packing gland (1), which is fixed by a special packing gland wrench (6).

2. A quick disconnect subsea valve according to claim 1, wherein: The upper and lower end faces of the conical valve seat (7) are provided with conical surfaces, the upper end conical surface is in sealing contact with the rubber valve plate (4-6), the lower end conical surface is frictionally fixed with the valve seat mounting seat (8), and the middle part of the conical valve seat (7) is provided with a weight-reducing hole, which facilitates the disassembly and replacement of the conical valve seat (7) from the upper part of the cylinder (5) through the special valve puller.

3. A quick disconnect subsea valve according to claim 1 or 2, characterised in that: The upper and lower ends of the valve stem (4-3) are provided with adjusting screws, and the position of the rubber valve plate (4-6) can be adjusted bidirectionally through the adjusting nut (4-1) to adapt to different sealing wear conditions.

4. A quick disconnect subsea valve according to claim 3, wherein: The gas release valve (3-7) is arranged on the sidewall of the upper flange plate (3-1) to balance the pressure difference between the inside and outside of the cylinder (5) and reduce the operating resistance of the valve stem (4-3).

5. A quick disconnect subsea valve according to claim 4, wherein: The T-shaped plate (3-3) is welded between the upper flange plate (3-1) and the inner frame (3-4) to enhance the structural stability of the upper flange cover assembly (3).

6. The quick disconnect subsea valve of claim 5, wherein: The valve stem fixing block (4-2) is fixed to the upper end of the valve stem (4-3) by screw thread connection, and is bolted with the inner frame (3-4) to realize the rigid fixation of the valve stem assembly (4) and the upper flange cover assembly (3).

7. The quick disconnect subsea valve of claim 6, wherein: The upper pressing plate (4-5) and the lower pressing plate (4-7) clamp the rubber valve plate (4-6) by bolts to form a detachable sealing structure, which facilitates the replacement of the worn valve plate.

8. The quick disconnect subsea valve of claim 7, wherein: The disc root pressing cap wrench (6) is a hexagonal special tool, the inner hole of which is matched with the outer edge shape of the disc root pressing cap (1), and is used for quickly tightening or disassembling the disc root pressing cap (1).

9. The quick disconnect subsea valve of claim 8, wherein: The valve rod assembly (4) further comprises a righting plate (4-4) welded on the upper and lower ends of the valve rod (4-3), and is used for limiting the radial deviation of the valve rod (4-3).

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