Flat valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a flat valve. The flat valve comprises a valve body, a valve hole and a working cavity are formed in the valve body in a penetrating mode, and the working cavity intersects with the valve hole; the valve covers are arranged at the two end parts of the working cavity of the valve body; the valve seat is arranged at the intersection of the valve hole and the working cavity, and a communicating hole for communicating the valve hole is formed in the valve seat; the valve plate is movably arranged on the valve seat in a sealed mode, and the valve plate is constructed to be capable of opening and closing the communicating hole; and the power mechanism is arranged on the outer side of the valve cover, is connected with the valve plate and is constructed to enable the valve plate to move relative to the valve seat so as to open and close the communicating hole.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of valve, specifically relates to a flat valve. BACKGROUND

[0002] In order to continuously improve oil and gas exploration and development efforts, more and more ultra-deep wells and other risk exploration wells will be deployed in the future. These wells have the characteristics of deep burial, high pressure coefficient, high single-well design production, high wellhead fluid temperature, etc. Even the completion depth exceeds 10000 meters, the formation pressure reaches 175MPa, the formation temperature exceeds 121 DEG C, and the predicted shut-in pressure exceeds 135MPa of ultra-high pressure well.

[0003] Manual flat valve is the most critical well control component in gas production wellhead equipment. The manual flat valve used in the current gas production wellhead equipment can withstand pressure of 140MPa at most, but the manual flat valve with this pressure level has been unable to meet the production safety needs of special wells. At the same time, the number of ultra-high pressure, multi-section, high sand content and acid-containing fracturing conditions is gradually increasing, which is easy to cause internal and external sealing failure of the manual flat valve, and is extremely easy to cause well control risk. UTILITY MODEL CONTENTS

[0004] In view of the above technical problems, the utility model aims at providing a flat valve which can be applied to ultra-deep wells.

[0005] According to the utility model, a flat valve is provided, which comprises:

[0006] A valve body, a valve hole and a working cavity are provided through the valve body, and the working cavity intersects with the valve hole;

[0007] Valve covers are arranged at both ends of the working cavity of the valve body;

[0008] A valve seat is arranged at the intersection of the valve hole and the working cavity, and a communication hole is arranged in the valve seat to communicate the valve hole;

[0009] A valve plate is arranged on the valve seat and is movable to open and close the communication hole;

[0010] A power mechanism is arranged outside the valve cover and is connected to the valve plate, and is configured to move the valve plate relative to the valve seat to open and close the communication hole.

[0011] In one specific embodiment, the power mechanism comprises:

[0012] An outer shell is fixedly arranged on the valve cover;

[0013] A rotating shaft is coaxially arranged in the outer shell;

[0014] A screw is coaxially arranged in the rotating shaft, and the screw is coaxially connected with the valve plate through a valve rod arranged at the end of the valve plate.

[0015] In one specific embodiment, the screw is a ball screw.

[0016] In one specific embodiment, a bearing is arranged between the rotating shaft and the housing.

[0017] In one specific embodiment, the housing comprises a housing body and a bearing seat arranged coaxially, the bearing seat is fixedly connected with the valve cover, a thrust bearing is arranged in a cavity formed between the bearing seat, the valve cover and the rotating shaft, and a radial bearing is arranged in a cavity formed between the housing body, the bearing seat and the rotating shaft.

[0018] In one specific embodiment, a rotating wheel is arranged at an end of the housing away from the valve plate, and the rotating wheel is connected with the rotating shaft through a speed reducer.

[0019] In one specific embodiment, a valve rod movable seal is arranged in the valve cover.

[0020] In one specific embodiment, a sealing packing is arranged between the valve rod and the valve cover.

[0021] In one specific embodiment, a valve rod packing gland for fixing the sealing packing is coaxially arranged on the valve rod, and the valve rod packing gland is fixedly connected with the valve cover.

[0022] In one specific embodiment, a tail rod for limiting is coaxially arranged at an end of the valve rod away from the rotating shaft.

[0023] Compared with the prior art, the application has the following advantages.

[0024] The flat plate valve disclosed by the application can bear pressure up to 175 MPa, can be used under high temperature and high pressure conditions, and is reliable in sealing. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be described below with reference to the drawings.

[0026] Figure 1 A schematic view showing one embodiment of the flat plate valve according to the application is shown.

[0027] The reference signs in the drawings are as follows:

[0028] 1, tail cover; 2, tail rod packing gland; 3, tail rod; 4, sealing packing; 5, valve cover; 6, sealing gasket ring; 7, guide plate; 8, valve seat; 81, communication hole; 9, valve seat sealing ring; 10, valve body; 11, valve plate; 111, connecting hole; 12, valve rod; 13, bolt; 15, valve rod packing gland; 16, bearing seat; 17, thrust bearing; 18, radial bearing; 19, rotating shaft; 20, lead screw; 21, housing; 211, shell; 22, rotating wheel; 23, conversion joint; 24, fixing pin; 30, power mechanism; 100, flat plate valve; 101, valve hole; 102, working cavity.

[0029] In this application, all the drawings are schematic drawings, only for explaining the principle of the utility model, and are not drawn according to the actual proportion. DETAILED DESCRIPTION

[0030] The utility model will be introduced below by the drawings.

[0031] It should be noted that the directional phrases or limiting words "up", "down", "left", "right" and the like used in this application are all relative to the Figure 1 direction of the drawings. They are not used to limit the absolute position of the involved parts, but can be changed according to the specific situation.

[0032] Figure 1 The structure of the flat plate valve 100 according to the utility model is shown. As Figure 1 shown, the flat plate valve 100 mainly includes a valve body 10, a valve cover 5, a valve seat 8, a valve plate 11 and a power mechanism 30.

[0033] In this embodiment, a valve hole 101 and a working cavity 102 are provided through the valve body 10, and the working cavity 102 intersects with the valve hole 101. As Figure 1 shown, the valve hole 101 is provided through the valve body 10 along the left-right direction, and the working cavity 102 is provided through the valve body 10 along the up-down direction, and the valve hole 101 and the working cavity 102 intersect at the middle part of the valve body 10.

[0034] Two valve covers 5 are respectively arranged at the upper and lower ends of the valve body 10, and a sealing gasket ring 6 is arranged between the valve cover 5 and the valve body 10 to seal the gap between the valve cover 5 and the valve body 10.

[0035] In a preferred embodiment, an edge sealing gasket ring is further arranged at the edge between the bonnet 5 and the valve body 10, and both the sealing gasket ring 6 and the edge sealing gasket ring are self-energizing gasket rings. The contact between the sealing gasket ring 6 and the gasket groove is initially outside the gasket groove and has the effect of internal pressure assisted sealing. The self-energizing gasket ring design not only meets the 175MPa pressure sealing requirement, but also effectively prevents sealing failure caused by well pressure changes and pressure vibration during pressure testing. The self-energizing sealing gasket ring is well known to those skilled in the art and will not be described here.

[0036] In a specific embodiment, the bonnet 5 and the valve body 10 are connected by bolts 13. In this embodiment, the bolts 13 are configured as fillet threads. Fillet threads are well known to those skilled in the art and will not be described here. Through this connection mode, not only can the volume and weight of the flat plate valve 100 be greatly reduced to facilitate on-site use, but also the emergence of the flat plate valve 100 flange hub on both sides is avoided, greatly improving the strength of the flat plate valve 100.

[0037] The valve seat 8 is sealingly arranged at the intersection of the valve hole 101 and the working chamber 102, and a communication hole 81 communicating the valve hole 101 is arranged in the valve seat 8. Specifically, the center axis of the communication hole 81 coincides with the center axis of the valve hole 101. A valve seat sealing ring 9 is arranged between the left and right end portions of the valve seat 8 and the valve body 10.

[0038] The valve plate 11 is movably sealingly arranged on the valve seat 8, and the valve plate 11 is configured to open and close the communication hole 81. In this embodiment, the valve plate 11 is movably sealingly arranged in the valve seat 8 in the up-down direction, and the valve plate 11 can block the communication hole 81 of the valve seat 8, at which time the flat plate valve 100 is in a closed state. A connecting hole 111 is arranged through the valve plate 11, and the center axis of the connecting hole 111 is parallel to the center axis of the communication hole 81. When the valve plate 11 moves relative to the valve seat 8 to make the connecting hole 111 coincide with the communication hole 81, the flat plate valve 100 is in an open state.

[0039] In a preferred embodiment, the contact sealing surface of the valve seat 8 and the valve plate 11 is treated by a supersonic spraying tungsten carbide process to improve the surface hardness and corrosion resistance of the contact sealing surface of the valve plate 11 and the valve seat 8, thereby improving the sealing performance. The supersonic spraying tungsten carbide process is well known to those skilled in the art and will not be described here.

[0040] The power mechanism 30 is arranged on the upper part of the upper bonnet 5, and the power mechanism 30 is connected to the valve plate 11 and is configured to move the valve plate 11 relative to the valve seat 8, thereby opening and closing the communication hole 81.

[0041] In a specific embodiment, the power mechanism 30 includes a housing 21, a rotating shaft 19, and a lead screw 20.

[0042] The shell 21 is configured as a cylinder, fixedly arranged at the upper portion of the valve cover 5, and the central axis of the shell 21 coincides with the central axis of the working cavity 102. The rotating shaft 19 is configured as a cylindrical shape, coaxially arranged in the shell 21. The lead screw 20 is coaxially arranged in the interior of the rotating shaft 19, and a thread for connecting with the lead screw 20 is arranged on the inner wall of the rotating shaft 19, and the rotating shaft 19 is coaxially connected with the lead screw 20 through the thread. The valve rod 12 is fixedly arranged at both upper and lower ends of the valve plate 11. The valve rod 12 located above the valve plate 11 is movably sealed through the valve cover 5, and is coaxially fixedly connected with the lead screw 20.

[0043] In this arrangement, when the rotating shaft 19 rotates relative to the shell 21 and the lead screw 20, the thread between the rotating shaft 19 and the lead screw 20 causes the lead screw 20 to move coaxially up and down relative to the rotating shaft 19, thereby driving the valve plate 11 to move relative to the valve seat 8 through the valve rod 12.

[0044] In a preferred embodiment, the lead screw 20 is a ball screw, and the lead screw 20 is connected with the rotating shaft 19 through balls.

[0045] In a specific embodiment, the valve rod 12 and the valve plate 11 are connected with each other through a T-shaped slot connection. This connection not only improves the connection reliability of the connection position of the valve rod 12 and the valve plate 11, but also improves the stability of the valve rod 12 during lifting of the valve plate 11.

[0046] In a specific embodiment, the lead screw 20 and the valve rod 12 are fixedly connected through a fixed pin 24.

[0047] In a preferred embodiment, a guide plate 7 for guiding the valve plate 11 is arranged on the valve seat 8. Not only can the valve plate 11 be provided with a certain guiding effect to increase the stability of the opening and closing movement of the valve plate 11, but also has a certain sand prevention function to prevent a large amount of sand-containing liquid from entering the valve body during the opening and closing process.

[0048] In the embodiment, bearings are arranged between the rotating shaft 19 and the housing 21. Specifically, the housing 21 comprises a housing 211 and a bearing seat 16 arranged coaxially. The lower end of the bearing seat 16 is fixedly connected with the valve cover 5, and the housing 211 is located above the bearing seat 16, and the housing 211 and the bearing seat 16 are fixedly connected by bolts. A thrust bearing 17 is arranged in the cavity formed between the bearing seat 16, the valve cover 5 and the rotating shaft 19. A radial bearing 18 is arranged in the cavity formed between the housing 211, the bearing seat 16 and the rotating shaft 19. By arranging the thrust bearing 17 and the radial bearing 18, the rotating shaft 19 can rotate relative to the housing 21 and the lead screw 20. The thrust bearing 17 is selected as a main bearing, and a planar thrust roller bearing is selected, and a high-precision cylindrical roller increases the contact length, so that the bearing can obtain high load capacity and high stiffness in a small space, and the cylindrical surface of the cylindrical roller adopted by the planar cylindrical roller bearing is a modified surface, which can reduce edge stress and improve service life. The radial bearing 18 is selected as an auxiliary bearing, and a deep groove ball bearing is selected. The bearing can right the rotating shaft 19, avoid radial interference between the rotating shaft 19 and other parts under high torque and low speed, and make the rotating shaft 19 more smooth in the opening and closing process.

[0049] In a preferred embodiment, a rotating wheel 22 is arranged at the end of the housing 21 away from the valve plate 11, and the rotating wheel 22 is connected with the rotating shaft 19 through a reduction box. Artificially rotating the rotating wheel 22 can transmit torque to the rotating shaft 19 through the reduction box, which can save labor. Further, a conversion joint 23 is arranged coaxially in the housing 21, the upper end of the conversion joint 23 is connected with the output end of the reduction box, and the lower end of the conversion joint 23 is fixedly connected with the rotating shaft 19 coaxially.

[0050] In the embodiment, the valve rod 12 is movably sealed in the valve cover 5, and a sealing packing 4 is arranged between the valve rod 12 and the valve cover 5. A valve rod packing gland 15 for fixing the sealing packing 4 is arranged coaxially on the valve rod 12, and the valve rod packing gland 15 is fixedly connected with the valve cover 5 in a threaded connection manner. In this arrangement, the two axial ends of the sealing packing 4 abut against the valve rod packing gland 15 and the valve cover 5 respectively, and by tightening the valve rod packing gland 15, the valve rod packing gland 15 axially extrudes the sealing packing 4, so that the sealing packing 4 radially expands to strengthen the sealing of the sealing packing 4 between the valve rod 14 and the valve cover 5.

[0051] In a preferred embodiment, a tail rod 3 for limiting is arranged coaxially at the lower end of the valve rod 12 below the valve plate 11. The radial dimension of the tail rod 3 is greater than the radial dimension of the valve rod packing gland 15, and when the valve plate 11 moves upward relative to the valve seat 8, the tail rod 3 abuts against the valve rod packing gland 15 axially, which can limit the movement range of the valve plate 11.

[0052] In a preferred embodiment, a tail cover 1 is fixedly arranged below the bonnet 5 below the valve body 10, and a tail rod packing gland 2 is coaxially arranged at the lower end of the tail rod 3, and the tail rod packing gland 2 is located inside the tail cover 1.

[0053] In a preferred embodiment, the sealing packing 4 and the valve seat sealing ring 9 are arranged in a combined sealing structure.

[0054] In a specific embodiment, the sealing packing 4 is a combined packing composed of polytetrafluoroethylene, PEEK and Elgiloy alloy spring, and has the properties of high pressure resistance, high temperature resistance and high corrosion resistance, and the working pressure can reach 37500 PSI, and the allowable working temperature can reach-29 DEG C to 180 DEG C. In the embodiment, the main body of the sealing packing 4 is made of high-performance filled polytetrafluoroethylene, the sealing pressure-bearing end is made of high-performance PEEK material and can adapt to the impact of superhigh pressure, and the Elgiloy alloy spring is arranged on the elastic compensation source as an initial compression elastic compensation source to maintain the pre-compression elastic force in the severe temperature difference and the high-pressure and high-corrosion medium to meet the complex working conditions. The specific structure of the combined packing is known to those skilled in the art, and will not be described here.

[0055] In a specific embodiment, the valve seat sealing ring 9 is arranged in a double-PEEK-ring structure, and has inner and outer valve seat sealing rings. The design has excellent sealing stability in multiple PR2F high and low temperature cycle tests and field practice, and has a certain sand prevention function. The valve seat sealing ring 9 is composed of PEEK and Elgiloy alloy spring, and has the properties of high pressure resistance, high temperature resistance and high corrosion resistance, and the working pressure can reach 37500 PSI, and the allowable working temperature can reach-29 DEG C to 180 DEG C. In the embodiment, the main body of the valve seat sealing ring 9 is made of high-performance engineering plastic PEEK as a sealing material, and the Elgiloy alloy spring is arranged as a compression compensation source to maintain the pre-compression elastic force in the severe temperature difference and the high-pressure and high-corrosion medium to achieve good sealing effect. The specific structure of the valve seat sealing ring 9 is known to those skilled in the art, and will not be described here.

[0056] In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0057] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0058] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Finally, it should be noted that the above only describes the preferred embodiments of the utility model, and does not constitute any limitation on the utility model. Although the utility model is described in detail with reference to the foregoing embodiments, the skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A flat valve, characterized by The utility model relates to a valve body (10) is provided with valve hole (101) and working chamber (102) on the valve body (10), and the working chamber (102) intersects with the valve hole (101), the valve cover (5) is provided at both ends of the working chamber (102) of the valve body (10), the valve seat (8) is provided at the intersection of the valve hole (101) and the working chamber (102), and the communication hole (81) that communicates the valve hole (101) is provided in the valve seat (8), the valve plate (11) is movably sealed on the valve seat (8), and the valve plate (11) is configured to open and close the communication hole (81), and the power mechanism (30) is provided outside the valve cover (5), and the power mechanism (30) is connected with the valve plate (11) and is configured to move the valve plate (11) relative to the valve seat (8) to open and close the communication hole (81). The power mechanism (30) comprises: The housing (21) is fixedly arranged on the valve cover (5), The rotating shaft (19) is coaxially arranged in the housing (21), The lead screw (20) is coaxially arranged in the rotating shaft (19), and the lead screw (20) is coaxially connected with the valve plate (11) through the valve rod (12) arranged at the end of the valve plate (11). The lead screw (20) is a ball screw.

2. The flat valve according to claim 1, characterized in that A bearing is arranged between the rotating shaft (19) and the housing (21). The housing (21) comprises a housing body (211) and a bearing seat (16) arranged coaxially, the bearing seat (16) is fixedly connected with the valve cover (5), a thrust bearing (17) is arranged in the cavity formed between the bearing seat (16), the valve cover (5) and the rotating shaft (19), and a radial bearing (18) is arranged in the cavity formed between the housing body (211), the bearing seat (16) and the rotating shaft (19). A rotating wheel (22) is arranged at one end of the housing (21) away from the valve plate (11), and the rotating wheel (22) is connected with the rotating shaft (19) through a speed reducer. The valve rod (12) is movably sealed in the valve cover (5).

3. A flat valve according to claim 2, characterized in that A sealing packing (4) is arranged between the valve rod (12) and the valve cover (5).

4. The flat valve according to claim 2, characterized in that A valve rod packing gland (15) for fixing the sealing packing (4) is coaxially arranged on the valve rod (12), and the valve rod packing gland (15) is fixedly connected with the valve cover (5).

5. A flat valve according to claim 4, characterized in that A tail rod (3) for limiting is coaxially arranged at the end of the valve rod (12) away from the rotating shaft (19).

6. The flat valve according to claim 2, characterized in that ​ 7. The flat valve according to claim 2, characterized in that ​ 8. A flat valve according to claim 7, characterized in that ​ 9. A flat valve according to claim 8, characterized in that ​ 10. The flat valve according to claim 2, characterized in that ​

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