Side stop check valve convenient to maintain

Abstract

The invention relates to the technical field of check valves, in particular to a side stop check valve convenient to maintain, which comprises a main stop valve body and a main stop valve cover, the main stop valve cover is mounted at the top of the main stop valve body, a first cavity of the main stop valve cover is communicated with an inner cavity of the main stop valve body, and a second cavity of the main stop valve cover is communicated with an outer cavity of the main stop valve body. A threaded sleeve is installed in an inner cavity of the main stop valve cover in a matched mode, a corrugated spring is connected between the top of the threaded sleeve and the top face of the inner cavity of the main stop valve cover, an integrated lengthened valve rod is installed in the threaded sleeve in a threaded mode, and the bottom end of the integrated lengthened valve rod extends into a first cavity of the main stop valve body. According to the scheme, abrasion between the integrally lengthened valve rod and the valve seat is reduced, the sealing life of the main stop valve is prolonged, then the maintenance frequency is reduced, and later maintenance operation is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, and in particular to a side stop check valve which is easy to maintain. Background Art

[0002] The stop check valve is composed of a check valve, a main stop valve, a secondary stop valve, and a discharge valve. When the purge is performed, the check valve is opened first, and the gas flows through the main stop valve to the rear end load. When the purge is completed, the secondary stop valve is opened, and the low-pressure gas is discharged through the discharge valve. However, in the prior art, the main stop valve has the following disadvantages:

[0003] 1. Since the main stop valve is operated more frequently than other valves, the friction between its valve stem and the inner cavity of the main stop valve body during operation is relatively large, which increases the wear between the two and increases the maintenance frequency of the main stop valve;

[0004] Second, the expansion and contraction performance of the spring in the main stop valve is relatively large, so the spring occupies a larger space in the inner cavity of the main stop valve, which increases the volume of the main stop valve, and then increases the weight of the main stop valve, which is not conducive to subsequent handling and maintenance operations. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a side stop check valve which is easy to maintain.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: a side stop check valve which is easy to maintain, comprising a main stop valve body and a main stop valve cover, wherein the main stop valve cover is installed on the top of the main stop valve body, the first cavity of the main stop valve cover is communicated with the inner cavity of the main stop valve body, a threaded sleeve is matched and installed in the inner cavity of the main stop valve cover, a corrugated spring is connected between the top of the threaded sleeve and the inner cavity top surface of the main stop valve cover, an integral extended valve stem is installed on the inner thread of the threaded sleeve, and the bottom end of the integral extended valve stem extends to the main stop valve In the first cavity of the valve body, a main stop valve bushing is matched and installed in the first cavity of the main stop valve body, the one-piece extended valve stem is inserted into the inner hole of the main stop valve bushing, and two slide grooves are opened in the inner hole of the main stop valve bushing, and a sliding pin is installed through the side of the one-piece extended valve stem, and the two ends of the sliding pin extend into the two slide grooves respectively, and a packing gasket is provided on the surface fixing sleeve of the one-piece extended valve stem, and a disc spring for the one-piece extended valve stem to be inserted is installed at the bottom of the main stop valve bushing, and the inner hole of the disc spring is matched with the packing gasket.

[0007] Preferably, a main stop valve sleeve is matched in the first cavity of the main stop valve body, and the main stop valve sleeve is located below the main stop valve sleeve, and the bottom end of the integrated extended valve stem extends into the inner hole of the main stop valve sleeve, and a main stop valve seat is provided below the integrated extended valve stem, and the inner hole of the main stop valve seat is connected to the exhaust channel of the main stop valve body, and the bottom end of the integrated extended valve stem is matched with the inner hole of the main stop valve seat.

[0008] Preferably, two symmetrically arranged second cavities are provided at both ends of the main stop valve body, the two second cavities are connected to the first cavity, the second cavity is stepped, a check valve sleeve is matched and installed inside the second cavity, a check valve core is elastically connected inside the check valve sleeve, a check valve seat is provided between the step surface of the check valve sleeve and the second cavity, a valve seat pressure ring is installed on the side of the check valve seat, and the check valve core is matched with the inner hole of the check valve seat.

[0009] Preferably, a compression spring is installed at one end of the check valve core, and one end of the compression spring is installed on the inner surface of the check valve sleeve.

[0010] Preferably, a secondary stop valve body is installed on the top of the main stop valve body, and a secondary stop valve core is sealed and installed in the inner cavity of the secondary stop valve body, a pressure cover is installed on the top of the top of the main stop valve body, one end of the secondary stop valve core passes through the pressure cover and extends to the top of the secondary stop valve body, a full-circulation channel is opened on the top of the main stop valve body, and the full-circulation channel is connected with the inner cavity of the main stop valve body, and a connecting channel is opened at the bottom of the secondary stop valve body, and the connecting channel is connected with the inner cavity of the secondary stop valve body, and the connecting channel and the full-circulation channel are connected.

[0011] Preferably, a sealing ring is matched and installed in the inner cavity of the auxiliary stop valve body, and the auxiliary stop valve core is matched and inserted in the inner cavity of the sealing ring.

[0012] Preferably, a relief valve body is installed on the side of the auxiliary stop valve body, a mounting groove is opened on the side of the auxiliary stop valve body, the mounting groove is communicated with the inner cavity of the auxiliary stop valve body, the inner cavity of the relief valve body corresponds to the position of the mounting groove, a locking nut is installed on the end of the relief valve body, a screw is threadedly inserted into the inner hole of the locking nut, one end of the screw extends into the inner cavity of the relief valve body, an adjustment seat is movably installed on one end of the screw, and a relief valve sleeve is provided on one side of the adjustment seat. The two ends of the relief valve sleeve are respectively located in the mounting groove and the inner cavity of the relief valve body, a relief valve core is installed through the side of the relief valve sleeve, a spring seat is installed at one end of the relief valve core, a tension spring is connected between the spring seat and the adjustment seat, a relief valve seat is installed in the mounting groove, the relief valve core is inserted in the inner hole of the relief valve seat, the other end of the relief valve core corresponds to the inner cavity position of the auxiliary stop valve body, and a gasket is installed on the other side of the relief valve sleeve.

[0013] Preferably, a secondary hand wheel is installed on one end of the secondary stop valve core extending to the outside of the secondary stop valve body.

[0014] Preferably, the top end of the threaded sleeve passes through the inner hole of the corrugated spring and extends to above the valve cover of the main stop valve, and the top end of the threaded sleeve is installed with a main hand wheel.

[0015] Preferably, a thrust needle roller bearing is installed between the threaded sleeve and the main stop valve bushing, and the integrated extended valve stem is inserted into the inner hole of the thrust needle roller bearing.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This solution arranges a sliding pin and a main stop valve bushing in the valve body of the main stop valve. When the threaded sleeve is rotated under force, the threaded sleeve applies torque to the integrated extended valve stem, and the integrated extended valve stem is limited in the torque direction by the sliding groove through the sliding pin, so that the integrated extended valve stem cannot rotate and only makes axial linear motion, thereby reducing the wear between the integrated extended valve stem and the valve seat, improving the sealing life of the main stop valve, thereby reducing the number of maintenance times and facilitating later maintenance operations;

[0018] In this solution, a corrugated spring is arranged in the valve body of the main stop valve. The corrugated spring exerts a downward force on the integral extended valve stem through its own elastic potential energy, thereby improving the sealing performance of the connection between the integral extended valve and the valve seat of the main stop valve.

[0019] This solution arranges a disc spring on the one-piece extended valve stem. Compared with traditional springs, the disc spring can withstand a huge load in a smaller space, reducing the usage space of the disc spring. Moreover, damage to a single disc in the disc spring will not affect the performance of the entire spring. Only individual discs need to be replaced, which facilitates subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axonometric view of a side stop check valve that is easy to maintain according to the present invention;

[0021] Figure 2 It is a first cross-sectional view of a side stop check valve that is easy to maintain according to the present invention;

[0022] Figure 3 A second cross-sectional view of a side stop check valve that is easy to maintain according to the present invention;

[0023] Figure 4 A third cross-sectional view of a side stop check valve that is easy to maintain according to the present invention;

[0024] Figure 5 It is a schematic diagram of the connection structure of the main stop valve bushing and the sliding pin of a side stop check valve which is easy to maintain according to the present invention;

[0025] Figure 6 The present invention is a cross-sectional view of the connection between the auxiliary stop valve body and the relief valve body of a side stop check valve that is easy to maintain.

[0026] In the figure: main stop valve cover 1, auxiliary stop valve body 2, slide 3, main stop valve body 4, relief valve body 5, auxiliary hand wheel 6, main hand wheel 7, threaded sleeve 8, full flow channel 9, sealing ring pressure ring 10, pressure cover 11, relief valve core 12, relief valve seat 13, relief valve sleeve 14, gasket 15, spring seat 16, tension spring 17, adjustment seat 18, sealing ring 19, screw 20, locking nut 21, Check valve seat 22, valve seat pressure ring 23, check valve core 24, check valve sleeve 25, compression spring 26, corrugated spring 27, integrated extended valve stem 28, thrust needle roller bearing 29, disc spring 30, packing gasket 31, main stop valve bushing 32, sliding pin 33, main stop valve sleeve 34, main stop valve seat 35, auxiliary stop valve core 36, connecting channel 37, exhaust hole 38, air inlet hole 39. DETAILED DESCRIPTION

[0027] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0028] like Figure 1-6 The side stop check valve shown in the figure is easy to maintain, comprising a main stop valve body 4 and a main stop valve bonnet 1. The main stop valve bonnet 1 is installed on the top of the main stop valve body 4. The first cavity of the main stop valve bonnet 1 is connected to the inner cavity of the main stop valve body 4.

[0029] A threaded sleeve 8 is matched and installed in the inner cavity of the main stop valve cover 1, and a corrugated spring 27 is connected between the top of the threaded sleeve 8 and the top surface of the inner cavity of the main stop valve cover 1. The corrugated spring 27 applies a downward force to the integrated extended valve stem 28 through its own elastic potential energy, thereby improving the sealing of the connection between the integrated extended valve 28 and the main stop valve seat 35.

[0030] An integrated extended valve stem 28 is installed on the inner thread of the threaded sleeve 8. The top of the integrated extended valve stem 28 is pre-threaded to facilitate the threaded connection between the integrated extended valve stem 28 and the threaded sleeve 8. The bottom end of the integrated extended valve stem 28 extends to the first cavity of the main stop valve body 4. A main stop valve bushing 32 is matched and installed in the first cavity of the main stop valve body 4. The integrated extended valve stem 28 is inserted into the inner hole of the main stop valve bushing 32. Two slide grooves 3 are opened in the inner hole of the main stop valve bushing 32. A sliding pin 33 is installed on the side of the integrated extended valve stem 28. The two ends of the sliding pin 33 extend into the two slide grooves 3 respectively. When the threaded sleeve 8 is rotated under force, the threaded sleeve 8 is pressed against the integrated extended valve stem 28. The valve stem applies torque, and the one-piece extended valve stem 28 is limited in the torque direction by the slide groove 3 through the sliding pin 33, so that the one-piece extended valve stem 28 cannot rotate and can only make axial linear motion, and the one-piece extended valve stem 28 drives the sliding pin 33 to slide in the slide groove 3, which facilitates the one-piece extended valve stem 28 to be removed from the main stop valve seat 35, so that the first cavity and the two second cavities are connected. At this time, the gas in the two second cavities is transported to the first cavity, and the gas in the first cavity is discharged into the pipeline through the exhaust channel; the non-rotating one-piece extended valve stem 28 can be installed with a multi-turn actuator without replacing any parts. The multi-turn actuator can replace manual operation and facilitate the control of the on-off work of the main stop valve.

[0031] The surface fixing sleeve of the integral extended valve stem 28 is provided with a packing seal 31 , and the bottom of the main stop valve bushing 32 is provided with a disc spring 30 through which the integral extended valve stem 28 can be inserted, and the inner hole of the disc spring 30 is matched with the packing seal 31 .

[0032] A main stop valve sleeve 34 is matched in the first cavity of the main stop valve body 4. The main stop valve sleeve 34 is located below the main stop valve bushing 32. The bottom end of the integrated extended valve stem 28 extends into the inner hole of the main stop valve sleeve 34. A main stop valve seat 35 is provided below the integrated extended valve stem 28. The inner hole of the main stop valve seat 35 is communicated with the exhaust channel of the main stop valve body 4. The bottom end of the integrated extended valve stem 28 is matched with the inner hole of the main stop valve seat 35. The bottom end of the integrated extended valve stem 28 is spherical. A hemispherical groove is provided at the top of the main stop valve seat 35, and a spherical sealing method is adopted. The sealing between the integrated extended valve stem 28 and the main stop valve seat 35 is enhanced, and the main stop valve sleeve 34 can reduce the impact force of the integrated extended valve stem 28, prevent the integrated extended valve stem 28 from position displacement during movement, improve the movement stability, and suppress the vibration of the integrated extended valve stem 28 during movement, thereby reducing the wear of the integrated extended valve stem 28 during movement and extending the service life of the integrated extended valve stem 28.

[0033] Two symmetrically arranged second cavities are provided at both ends of the main stop valve body 4, and the two second cavities are connected to the first cavity. The second cavity is stepped, and a check valve sleeve 25 is installed inside the second cavity to match, and a check valve core 24 is elastically connected inside the check valve sleeve 25. A check valve seat 22 is provided between the check valve sleeve 25 and the stepped surface of the second cavity, and a valve seat pressure ring 23 is installed on the side of the check valve seat 22. The check valve core 24 is matched with the inner hole of the check valve seat 22. During the process of external gas being transported to the two second cavities through the two air inlet holes 39 (the auxiliary stop valve is in a closed state), the gas pressure exceeds the opening pressure of the check valve core 24, and the check valve core 24 is pushed open, so that the check valve core 24 slides in the check valve sleeve 25 and moves away from the check valve seat 22, and the gas can flow smoothly into the second cavity. When the gas pressure in the second cavity decreases or the gas flow reverses, the check valve core 24 will close quickly under the action of fluid pressure and elasticity, thereby cutting off the backflow path of the gas and preventing the gas from flowing back; a full-flow flow channel design is adopted in the second cavity of the main stop valve body 4, and there is no throttling in the fully open state, and the blowing ability is strong; a metal retaining ring and a rubber sealing gasket are used to seal between the ends of the main stop valve body 4 and the check valve sleeve 25, and at the same time, the sealing reliability of the second cavity of the main stop valve body 4 under low and high pressure conditions is guaranteed.

[0034] A compression spring 26 is installed at one end of the check valve core 24, and one end of the compression spring 26 is installed on the inner surface of the check valve sleeve 25. When the check valve core 24 moves away from the check valve seat 22, the compression spring 26 is compressed after being subjected to force. At this time, the compression spring 26 is in an energy storage state. When the gas pressure in the second cavity decreases or the airflow flows in the reverse direction, the compression spring 26 pushes the check valve core 24 in the reverse direction to stably press it on the check valve seat 22, thereby improving the sealing between the check valve core 24 and the check valve seat 22.

[0035] A secondary stop valve body 2 is installed on the top of the main stop valve body 4, and a secondary stop valve core 36 is sealed in the inner cavity of the secondary stop valve body 2. A pressure cover 11 is installed on the top of the top of the main stop valve body 4. One end of the secondary stop valve core 36 penetrates the pressure cover 11 and extends to the top of the secondary stop valve body 2. A full-flow channel 9 is opened on the top of the main stop valve body 4, and the full-flow channel 9 is connected to the inner cavity of the main stop valve body 4. A connecting channel 37 is opened at the bottom of the secondary stop valve body 2, and the connecting channel 37 is connected to the inner cavity of the secondary stop valve body 2. The connecting channel 37 and the full-flow channel 9 are connected. The secondary stop valve core 36 and the pressure cover 11 are threadedly connected. If the residual gas at the rear end of the inner cavity of the check valve is less than 0.8MPa, it needs to be discharged through the discharge valve. During operation, Rotate the auxiliary stop valve core 36. After the auxiliary stop valve core 36 is subjected to force, it rotates threadedly in the pressure cover 11, which is convenient for driving the auxiliary stop valve core 36 to move upward. After the connecting channel 37 and the mounting groove are connected, the rotation of the auxiliary stop valve core 36 can be stopped; if the residual gas in the pipeline connected to the check valve is greater than 0.8MPa, the discharge valve is closed, and the auxiliary stop valve can also be closed at the same time. During operation, it is only necessary to rotate the auxiliary stop valve core 36 in the opposite direction to block the connecting channel 37 and the mounting groove, thereby improving the stability of the high-pressure gas in the pipeline; the auxiliary stop valve body 2 adopts 22053 duplex stainless steel, and the auxiliary stop valve core 36 adopts high-strength beryllium copper C17200 alloy. This material has high wear resistance and can form a reliable hard seal when combined with the auxiliary stop valve body 2.

[0036] A sealing ring 10 is matched and installed in the inner cavity of the auxiliary stop valve body 2, and the auxiliary stop valve core 36 is matched and inserted in the sealing ring 10. The sealing ring 10 is used to ensure the sealing of the connection between the auxiliary stop valve core 36 and the auxiliary stop valve body 2 to prevent gas leakage.

[0037] A relief valve body 5 is installed on the side of the auxiliary stop valve body 2, and a mounting groove is opened on the side of the auxiliary stop valve body 2. The mounting groove is communicated with the inner cavity of the auxiliary stop valve body 2, and the inner cavity of the relief valve body 5 corresponds to the position of the mounting groove. A locking nut 21 is installed on the end of the relief valve body 5, and a screw 20 is inserted into the inner hole of the locking nut 21. One end of the screw 20 extends into the inner cavity of the relief valve body 5, and an adjusting seat 18 is movably installed on one end of the screw 20 through a bearing. A relief valve sleeve 14 is provided on one side of the adjusting seat 18. The two ends of the relief valve sleeve 14 are respectively located in the mounting groove and the inner cavity of the relief valve body 5, and a relief valve sleeve 14 is installed through the side of the relief valve sleeve 14. The valve core 12 is provided with a spring seat 16 at one end of the discharge valve core 12, a tension spring 17 is connected between the spring seat 16 and the adjusting seat 18, a discharge valve seat 13 is installed in the mounting groove, the discharge valve core 12 is inserted into the inner hole of the discharge valve seat 13, the other end of the discharge valve core 12 corresponds to the inner cavity position of the auxiliary stop valve body 2, and a gasket 15 is installed on the other side of the discharge valve sleeve 14. When the blowing work is completed, if the residual gas at the rear end of the inner cavity of the check valve is less than 0.8MPa, the discharge valve is opened. During operation, it is only necessary to rotate the screw 20, the screw 20 rotates in the inner thread of the locking nut 21, and the screw 20 pushes the adjusting seat 18 to move, and the adjusting The joint seat 18 applies an external force to the tension spring 17, and the tension spring 17 pushes the relief valve core 12 to slide in the relief valve sleeve 14 through the spring seat 16. After the relief valve core 12 is removed from the relief valve seat 13, the remaining gas at the rear end of the check valve cavity is successively transported to the inner cavity of the auxiliary stop valve body 2 through the full-flow channel 9 and the connecting channel 37 (the auxiliary stop valve is opened in advance, so that the inner cavity of the auxiliary stop valve and the inner cavity of the check valve are connected), and then transported to the installation groove through the inner cavity of the auxiliary stop valve body 2, and the gas in the installation groove flows into the inner cavity of the relief valve body 5 through the gap between the relief valve sleeve 14 and the relief valve core 12, and then discharged through the exhaust hole 38 of the relief valve. Discharge low-pressure gas into the cabin; if the residual gas in the pipeline connected to the check valve is greater than 0.8MPa, close the relief valve. During operation, just rotate the screw 20 in the opposite direction. The screw 20 pulls the tension spring 17 through the adjusting seat 18. The other end of the tension spring 17 pulls the relief valve core 12 through the spring seat 16. The relief valve core 12 is pressed on the surface of the relief valve seat 13. At the same time, the reaction force generated by the elongation of the tension spring 17 is applied to the relief valve core 12. The relief valve core 12 receives the force of the tension spring 17 at the same time, which improves the stability of the relief valve core 12 pressing on the surface of the relief valve seat 13. At this time, the discharge of high-pressure gas can be prevented.

[0038] An auxiliary hand wheel 6 is installed on one end of the auxiliary stop valve core 36 extending to the outside of the auxiliary stop valve body 2 , and the auxiliary hand wheel 6 can be used by a staff 6 to rotate the auxiliary stop valve core 3 .

[0039] The top of the threaded sleeve 8 passes through the inner hole of the corrugated spring 27 and extends to the top of the main stop valve cover 1. The top of the threaded sleeve 8 is equipped with a main hand wheel 7, which can be used by the staff to drive the threaded sleeve 8 to rotate.

[0040] A thrust needle roller bearing 29 is installed between the threaded sleeve 8 and the main stop valve sleeve 32. The integrated extended valve stem 28 is inserted into the inner hole of the thrust needle roller bearing 29, which can reduce the friction of the threaded sleeve 8 rotating in the main stop valve cover 1 and improve the convenience of the threaded sleeve 8 rotating.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A side stop check valve that is easy to maintain, comprising a main stop valve body (4) and a main stop valve cover (1), wherein the main stop valve cover (1) is installed on the top of the main stop valve body (4), and the first cavity of the main stop valve cover (1) is connected to the inner cavity of the main stop valve body (4), characterized in that: A threaded sleeve (8) is matched and installed in the inner cavity of the main stop valve cover (1); a corrugated spring (27) is connected between the top of the threaded sleeve (8) and the inner cavity top surface of the main stop valve cover (1); an integral extended valve stem (28) is installed in the inner thread of the threaded sleeve (8); the bottom end of the integral extended valve stem (28) extends into the first cavity of the main stop valve body (4); a main stop valve bushing (32) is matched and installed in the first cavity of the main stop valve body (4); the integral extended valve stem (28) is inserted into the main stop valve bushing (32) ), two slide grooves (3) are opened in the inner hole of the main stop valve bushing (32), a sliding pin (33) is installed through the side of the one-piece extended valve stem (28), and the two ends of the sliding pin (33) extend into the two slide grooves (3) respectively, and a packing seal (31) is provided on the surface fixing sleeve of the one-piece extended valve stem (28), and a disc spring (30) is installed at the bottom of the main stop valve bushing (32) for the one-piece extended valve stem (28) to be inserted, and the inner hole of the disc spring (30) is matched with the packing seal (31).

2. A side stop check valve that is easy to maintain according to claim 1, characterized in that: A main stop valve sleeve (34) is matched in the first cavity of the main stop valve body (4), and the main stop valve sleeve (34) is located below the main stop valve bushing (32). The bottom end of the integrated extended valve stem (28) extends into the inner hole of the main stop valve sleeve (34). A main stop valve seat (35) is provided below the integrated extended valve stem (28), and the inner hole of the main stop valve seat (35) is connected to the exhaust channel of the main stop valve body (4). The bottom end of the integrated extended valve stem (28) is matched with the inner hole of the main stop valve seat (35).

3. A side stop check valve that is easy to maintain according to claim 1, characterized in that: Two symmetrically arranged second cavities are provided at both ends of the main stop valve body (4), the two second cavities are both connected to the first cavity, the second cavity is stepped, a check valve sleeve (25) is matched and installed inside the second cavity, the check valve sleeve (25) is elastically connected to the check valve core (24), a check valve seat (22) is provided between the check valve sleeve (25) and the stepped surface of the second cavity, a valve seat pressure ring (23) is installed on the side of the check valve seat (22), and the check valve core (24) is matched with the inner hole of the check valve seat (22).

4. A side stop check valve that is easy to maintain according to claim 3, characterized in that: A compression spring (26) is installed at one end of the check valve core (24), and one end of the compression spring (26) is installed on the inner surface of the check valve sleeve (25).

5. The ship-side stop check valve that is easy to maintain according to claim 3, characterized in that: A secondary stop valve body (2) is installed on the top of the main stop valve body (4), and a secondary stop valve core (36) is sealed in the inner cavity of the secondary stop valve body (2). A pressure cover (11) is installed on the top of the top of the main stop valve body (4), and one end of the secondary stop valve core (36) passes through the pressure cover (11) and extends to the top of the secondary stop valve body (2). A full-circulation channel (9) is opened on the top of the main stop valve body (4), and the full-circulation channel (9) is connected to the inner cavity of the main stop valve body (4). A connecting channel (37) is opened at the bottom of the secondary stop valve body (2), and the connecting channel (37) is connected to the inner cavity of the secondary stop valve body (2). The connecting channel (37) and the full-circulation channel (9) are connected.

6. A side stop check valve that is easy to maintain according to claim 5, characterized in that: A sealing ring (10) is matched and installed in the inner cavity of the auxiliary stop valve body (2), and the auxiliary stop valve core (36) is matched and inserted in the inner cavity of the sealing ring (10).

7. The ship-side stop check valve that is easy to maintain according to claim 5, characterized in that: A relief valve body (5) is installed on the side of the auxiliary stop valve body (2); a mounting groove is provided on the side of the auxiliary stop valve body (2); the mounting groove is communicated with the inner cavity of the auxiliary stop valve body (2); the inner cavity of the relief valve body (5) corresponds to the position of the mounting groove; a locking nut (21) is installed on the end of the relief valve body (5); a screw (20) is inserted into the inner hole of the locking nut (21); one end of the screw (20) extends into the inner cavity of the relief valve body (5); an adjustment seat (18) is movably installed on one end of the screw (20); a relief valve sleeve (14) is provided on one side of the adjustment seat (18); the relief valve The two ends of the sleeve (14) are respectively located in the mounting groove and the inner cavity of the relief valve body (5); a relief valve core (12) is installed through the side of the relief valve sleeve (14); a spring seat (16) is installed at one end of the relief valve core (12); a tension spring (17) is connected between the spring seat (16) and the adjustment seat (18); a relief valve seat (13) is installed in the mounting groove; the relief valve core (12) is inserted into the inner hole of the relief valve seat (13); the other end of the relief valve core (12) corresponds to the inner cavity position of the auxiliary stop valve body (2); and a gasket (15) is installed on the other side of the relief valve sleeve (14).

8. The ship-side stop check valve that is easy to maintain according to claim 5, characterized in that: An auxiliary hand wheel (6) is installed on one end of the auxiliary stop valve core (36) extending to the outside of the auxiliary stop valve body (2).

9. The ship-side stop check valve that is easy to maintain according to claim 1, characterized in that: The top end of the threaded sleeve (8) passes through the inner hole of the corrugated spring (27) and extends to the top of the main stop valve cover (1). The top end of the threaded sleeve (8) is equipped with a main hand wheel (7).

10. The ship-side stop check valve that is easy to maintain according to claim 1, characterized in that: A thrust needle roller bearing (29) is installed between the threaded sleeve (8) and the main stop valve bushing (32), and the integral extended valve stem (28) is inserted into the inner hole of the thrust needle roller bearing (29).

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