A marine pressure control valve structure

Abstract

The present invention belongs to the technical field of marine valves, and specifically is a marine pressure control valve structure, comprising a valve body, a valve seat is installed in the valve body, a valve cover is installed on the valve body, a valve stem is installed on the valve cover, and valve discs and hand wheels are installed at both ends of the valve stem; the valve seat and the valve body are fixedly installed by threads; a through hole is opened in the valve stem, a fixing rod is installed in the through hole, a closing bolt is installed at the opening of the through hole, the valve disc is installed at the lower end of the fixing rod, a pressing plate is installed at the lower end of the valve stem, a gap is formed between the pressing plate and the valve disc, and the lower surface of the pressing plate cooperates with the upper surface of the valve seat; the present invention has a simple structure, is convenient for replacing defective valve discs and valve seats, and prolongs the service life of the valve; and when defects occur, the valve can be quickly temporarily maintained and compensated when the valve is online, so as to ensure the normal use of the valve and reduce the difficulty of maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of marine valves, in particular to a marine pressure control valve structure. Background Art

[0002] Valves are control components in fluid delivery systems, with functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest shutoff valves to the various valves used in extremely complex automatic control systems. There are many piping systems on existing ships, and many types of valves are also installed on these piping systems.

[0003] In the prior art, when a slight defect appears on the sealing surface of the valve disc of a valve, it will cause the valve to leak, affecting the control effect of the valve. At this time, the defect is generally eliminated by grinding the sealing surface between the valve disc and the valve port. However, when a larger defect appears on the sealing surface, due to the cost and difficulty of maintenance, the defective valve can only be scrapped and replaced with a new valve, thereby shortening the service life of the valve and increasing the cost of use. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, facilitate the replacement of defective valve flaps and valve seats, extend the service life of the valve, and when defects occur, quickly perform temporary maintenance and compensation on the valve while the valve is online, thereby ensuring the normal use of the valve and reducing the difficulty of maintenance. The present invention proposes a marine pressure control valve structure.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the marine pressure control valve structure of the present invention comprises a valve body, the valve body is provided with an inlet and an outlet, a valve seat is installed in the valve body, a valve cover is installed on the valve body, a valve stem is installed on the valve cover, a valve disc is installed at the lower end of the valve stem, the valve disc and the valve seat cooperate with each other, a hand wheel is installed at the upper end of the valve stem through a fixing screw, a pressure cap is installed on the valve cover, and a pressure ring and a packing are installed between the pressure cap and the valve cover from top to bottom;

[0006] The valve seat and the valve body are fixedly installed via threads;

[0007] A through hole is provided in the valve stem, a fixing rod is installed in the through hole, the fixing rod and the upper ends of the through hole are provided with mutually meshing threads, a closing bolt is installed at the opening of the through hole, the valve flap is installed at the lower end of the fixing rod, a pressure plate is installed at the lower end of the valve stem, a gap is provided between the pressure plate and the valve flap, and the lower surface of the pressure plate cooperates with the upper surface of the valve seat.

[0008] Preferably, the threaded surfaces on the valve seat and the fixing rod are covered with an elastic layer.

[0009] Preferably, a plurality of groups of annular rings are arranged on the lower surface of the pressure plate and the upper surface of the valve seat, the annular rings on the pressure plate and the valve seat cooperate with each other, and the cross section of the annular rings is trapezoidal.

[0010] Preferably, the side surfaces of the annular ring on the pressure plate and the valve seat contact and squeeze each other, the annular ring on the pressure plate does not contact the upper surface of the valve seat, and the annular ring on the valve seat does not contact the lower surface of the pressure plate.

[0011] Preferably, an extrusion platform is provided on the fixing rod, an active cavity is provided on the inner wall of the through hole, and sealing gaskets are installed on the upper end surface and the lower end surface of the extrusion platform.

[0012] Preferably, the upper end surface and the lower end surface of the movable cavity are both inclined surfaces, and a plurality of extrusion platforms are provided on the fixed rod.

[0013] Preferably, a connecting block is installed in the gap between the pressure plate and the valve disc, the diameter of the connecting block is less than or equal to the diameter of the upper end of the valve disc, and the connecting block will deform when under pressure;

[0014] An upper protrusion is provided on the upper surface of the connecting block, a lower protrusion is provided on the lower surface of the connecting block, a positioning hole is provided on the surface of the valve disc, the lower protrusion is inserted into the positioning hole, and a mounting hole is provided on the pressure plate, the upper protrusion is inserted into the mounting hole.

[0015] Preferably, a mounting groove is provided on the pressing plate, the bottom surface of the mounting groove is inclined toward the fixing rod, a guide groove is provided on the bottom surface of the mounting groove, the length direction of the guide groove is the same as the radial direction of the mounting groove, and the upper protrusion is located in the guide groove;

[0016] A deformation cavity is provided in the connecting block.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The marine pressure control valve structure described in the present invention, by providing a valve stem, a fixing rod, a pressure plate, a valve disc and a valve seat, can conveniently replace the valve disc and the valve seat when defects occur on the sealing surface inside the valve, thereby extending the service life of the valve and reducing the cost of use. At the same time, when the valve is online or when there is a lack of valve spare parts, the fixing rod is rotated to make the pressure plate and the valve disc contact each other, so that when the valve is closed, the contact between the pressure plate and the upper surface of the valve seat is used to temporarily repair and compensate for the defects on the sealing surface inside the valve, thereby ensuring that the valve can be used normally and reducing the difficulty and workload of valve maintenance.

[0019] 2. The structure of a marine pressure control valve described in the present invention, by providing an annular ring, an extrusion platform, a movable cavity and a sealing gasket, utilizes the annular ring to increase the area of ​​the sealing surface when the pressure plate contacts the upper surface of the valve seat, thereby improving the sealing effect between the pressure plate and the valve seat and avoiding leakage of the control valve. At the same time, the sealing gasket is squeezed by the extrusion platform so that the sealing gasket seals the gap between the through hole and the fixed rod, thereby avoiding leakage of the working medium in the control valve from the through hole and affecting the normal use of the control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a front view of the control valve of the present invention;

[0022] Figure 2 is a cross-sectional view of a control valve of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the valve disc in the control valve of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the pressure plate in the control valve of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a connecting block in a control valve of the present invention;

[0026] Figure 6 yes Figure 1 A partial enlarged view of the middle part;

[0027] Figure 7 yes Figure 2 A partial enlarged view of point B in the middle;

[0028] Figure 8 yes Figure 2 A partial enlarged view of point C in the middle;

[0029] Fig. 9 yes Figure 2 A partial enlarged view of point D in the middle;

[0030] In the figure: valve body 1, outlet 11, inlet 12, valve cover 13, pressure cap 14, pressure ring 141, packing 142, hand wheel 15, fixing screw 151, valve seat 2, valve disc 3, positioning hole 31, valve stem 4, pressure plate 41, annular ring 411, mounting groove 412, guide groove 413, fixing rod 42, extrusion platform 421, movable cavity 422, sealing gasket 423, closing bolt 43, connecting block 44, upper protrusion 441, lower protrusion 442, deformation cavity 443. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figures 1 to 9 As shown, a marine pressure control valve structure of the present invention comprises a valve body 1, wherein the valve body 1 is provided with an inlet 12 and an outlet 11, wherein a valve seat 2 is installed in the valve body 1, wherein a valve cover 13 is installed on the valve body 1, wherein a valve stem 4 is installed on the valve cover 13, wherein a valve flap 3 is installed at the lower end of the valve stem 4, wherein the valve flap 3 cooperates with the valve seat 2, wherein a hand wheel 15 is installed at the upper end of the valve stem 4 via a fixing screw 151, wherein a pressure cap 14 is installed on the valve cover 13, wherein a pressure ring 141 and a packing 142 are installed between the pressure cap 14 and the valve cover 13 from top to bottom;

[0033] The valve seat 2 and the valve body 1 are fixedly installed via threads;

[0034] A through hole is provided in the valve stem 4, a fixing rod 42 is installed in the through hole, the fixing rod 42 and the upper ends of the through hole are provided with mutually meshing threads, a closing bolt 43 is installed at the opening of the through hole, the valve flap 3 is installed at the lower end of the fixing rod 42, a pressing plate 41 is installed at the lower end of the valve stem 4, a gap is provided between the pressing plate 41 and the valve flap 3, and the lower surface of the pressing plate 41 cooperates with the upper surface of the valve seat 2;

[0035] During operation, if a defect occurs on the sealing surface between the valve seat 2 and the valve disc 3, resulting in leakage in the control valve, the valve cover 13 is opened, and the valve stem 4 and the valve disc 3 are taken out from the valve body 1. At the same time, if the defect is small, the sealing surface of the valve disc 3 and the valve seat 2 is ground to eliminate the defect on the sealing surface to ensure the normal use of the control valve. If the defect is large, the valve disc 3 and the threaded valve seat 2 are disassembled and replaced to eliminate the defect, thereby facilitating the maintenance of the control valve, reducing the use cost of the control valve, and extending the service life of the control valve;

[0036] At the same time, when the defects on the sealing surface cannot be eliminated by grinding, and the defects on the sealing surface have not reached the standard for replacing the valve disc 3 and the valve seat 2, in order to eliminate the defects on the sealing surface and ensure the normal use of the control valve, the staff removes the closing bolt 43 in the through hole on the valve stem 4, and then twists the fixing rod 42 in the through hole to move the fixing rod 42 upward in the through hole, so that the valve disc 3 connected to the lower end of the fixing rod 42 moves upward, so that the valve disc 3 and the pressure plate 41 are in close contact with each other, so that the pressure plate 41 can work. At this time, when the control valve needs to be closed, the valve disc 3 will be inserted into the valve port on the valve seat 2 for sealing, and the pressure plate 41 will contact and squeeze the upper surface of the valve seat 2 for sealing, so as to use the contact between the pressure plate 41 and the valve seat 2 to repair and compensate for the defects on the sealing surface, so as to ensure the normal use of the control valve;

[0037] At the same time, since the fixing rod 42 is installed in the through hole in the valve stem 4, and the valve stem 4 does not need to rotate synchronously when the fixing rod 42 is twisted, when the control valve fails and there is leakage of the working medium, the staff can directly rotate the fixing rod 42 to make the valve disc 3 and the pressure plate 41 contact each other, and then turn the hand wheel 15 to drive the valve disc 3 and the pressure plate 41 to move downward, so that the valve disc 3 contacts the valve port and the pressure plate 41 contacts the upper surface of the valve seat 2, thereby completing the temporary repair of the control valve, avoiding the need to disassemble the control valve or install a bypass pipeline when repairing the control valve, and being able to quickly repair the leakage defect of the control valve when the control valve is online, thereby reducing the difficulty and workload of control valve maintenance;

[0038] At the same time, in the case of a lack of control valve spare parts or the control valve spare parts are used up, such as when the sealing surface of the control valve is defective during the ship's voyage at sea, resulting in the need to replace the faulty control valve, the valve seat 2 can be temporarily repaired by the pressure plate 41 to ensure the normal operation of the equipment equipped with the control valve before the control valve spare parts are purchased again, that is, before the ship docks and re-purchases the spare parts, to avoid safety accidents or impact on the normal operation of the equipment.

[0039] As an embodiment of the present invention, the threaded surfaces on the valve seat 2 and the fixing rod 42 are covered with an elastic layer;

[0040] By covering the surface of the thread with an elastic layer, the gap between the threads is filled to avoid leakage at the threads between the valve seat 2 and the valve body 1, and between the fixing rod 42 and the through hole, which affects the normal use of the control valve. At the same time, through the covering elastic layer, when the control valve is closed, the valve seat 2 will be squeezed by the valve disc 3, so that the threads between the valve seat 2 and the valve body 1 are close to and fit each other, thereby improving the sealing effect and avoiding leakage at the threads. Similarly, the closing bolt 43 installed in the through hole will squeeze the fixing rod 42 to ensure that the position of the fixing rod 42 in the through hole is stable, and the fixing rod 42 is prevented from being stripped or not tightened, which affects the normal use of the control valve. At the same time, through the squeezing of the fixing rod 42 by the closing bolt 43, the threads between the fixing rod 42 and the through hole can also be close to and fit each other, thereby improving the sealing effect between the fixing rod 42 and the through hole. In addition, the squeezing of the fixing rod 42 by the closing bolt 43 can also ensure that the position of the fixing rod 42 in the through hole is stable, thereby preventing the threads between the fixing rod 42 and the through hole from loosening and causing the fixing rod 42 to move.

[0041] As an embodiment of the present invention, a plurality of annular rings 411 are provided on the lower surface of the pressure plate 41 and the upper surface of the valve seat 2. The annular rings 411 on the pressure plate 41 and the valve seat 2 cooperate with each other, and the cross section of the annular rings 411 is a trapezoid.

[0042] When the control valve is closed, the pressure plate 41 is pressed downward and fits against the upper surface of the valve seat 2, and the control valve is sealed by the contact surface between the two. At this time, the mutual contact between the pressure plate 41 and the valve seat 2 is not as good as the sealing effect of the inclined contact between the valve disc 3 and the valve port, which makes it easy for the working medium to leak from the contact surface between the pressure plate 41 and the valve seat 2, affecting the sealing effect of the control valve. Therefore, multiple groups of annular rings 411 are arranged on the pressure plate 41 and the valve seat 2, so that when the pressure plate 41 and the valve seat 2 are in contact with each other, the mutual contact between the annular rings 411 is utilized to increase the sealing area between the pressure plate 41 and the valve seat 2, thereby improving the sealing effect and avoiding leakage of the control valve, which affects the repair effect of the control valve.

[0043] As an embodiment of the present invention, the sides of the pressing plate 41 and the annular ring 411 on the valve seat 2 contact and squeeze each other, and the annular ring 411 on the pressing plate 41 does not contact the upper surface of the valve seat 2, and the annular ring 411 on the valve seat 2 does not contact the lower surface of the pressing plate 41;

[0044] When the pressure plate 41 contacts the upper surface of the valve seat 2, the pressure plate 41 will be subjected to a downward force, so that the side surfaces of the pressure plate 41 and the annular ring 411 on the valve seat 2 contact and squeeze each other, thereby increasing the squeezing force between the two and improving the sealing effect within the range of the annular ring 411. At the same time, the pressure plate 41 and the annular ring 411 on the valve seat 2 will not contact each other's surface, so that when the pressure plate 41 moves downward and seals, there is always a gap between the pressure plate 41 and the annular ring 411 on the valve seat 2 for insertion toward each other, thereby avoiding the abutment between the pressure plate 41 and the valve seat 2 by the end surface of the annular ring 411, affecting the squeezing and fitting effect of the side surface of the annular ring 411, that is, the squeezing and fitting effect of the sealing surface, thereby affecting the sealing of the control valve.

[0045] As an embodiment of the present invention, an extrusion platform 421 is provided on the fixing rod 42, an active cavity 422 is provided on the inner wall of the through hole, and sealing pads 423 are installed on the upper and lower end surfaces of the extrusion platform 421;

[0046] When the control valve is in normal use, there is a gap between the pressure plate 41 and the valve disc 3. At this time, the lower surface of the extrusion platform 421 contacts and squeezes the lower surface of the active cavity 422, and the sealing gasket 423 is used to seal the fixed rod 42 in the through hole to prevent the working medium in the control valve from leaking from the gap between the through hole and the fixed rod 42, which affects the normal use of the control valve.

[0047] At the same time, when the control valve fails and needs to be temporarily repaired by using the pressure plate 41, the pressure plate 41 and the valve disc 3 are closely attached to each other, and the gap between the pressure plate 41 and the valve disc 3 disappears. At this time, the extrusion platform 421 will move upward, so that the upper surface of the extrusion platform 421 contacts and squeezes the upper surface of the active cavity 422, and the sealing gasket 423 is used to seal the fixed rod 42 in the through hole, so as to prevent the working medium in the control valve after the temporary repair from leaking from the gap between the through hole and the fixed rod 42, which affects the normal use of the control valve;

[0048] In summary, through the mutual cooperation between the extrusion platform 421 and the upper and lower surfaces of the movable cavity 422, the gap between the through hole and the fixed rod 42 is sealed, thereby ensuring the sealing effect of the control valve during normal use and use after temporary repair, avoiding leakage of the working medium from the through hole, affecting the normal use or repair effect of the control valve.

[0049] As an embodiment of the present invention, the upper end surface and the lower end surface of the movable cavity 422 are both inclined surfaces, and the extrusion platform 421 on the fixed rod 42 is provided with multiple groups;

[0050] Since the upper end face or the lower end face of the movable chamber 422 is an inclined face, when the extrusion platform 421 drives the sealing gasket 423 to contact and squeeze the upper end face or the lower end face of the movable chamber 422, the sealing gasket 423 will be deformed and moved toward the fixed rod 42, thereby fully improving the sealing effect of the sealing gasket 423 on the gap between the through hole and the fixed rod 42, thereby preventing the working medium in the control valve from leaking from the through hole and affecting the normal use of the control valve. At the same time, by arranging multiple groups of extrusion platforms 421 on the fixed rod 42, so as to form multiple seals in the through hole, the sealing effect of the fixed rod 42 in the through hole is further improved, thereby preventing the working medium in the control valve from leaking from the through hole.

[0051] As an embodiment of the present invention, a connecting block 44 is installed in the gap between the pressure plate 41 and the valve disc 3, the diameter of the connecting block 44 is less than or equal to the diameter of the upper end of the valve disc 3, and the connecting block 44 will deform when under pressure;

[0052] An upper protrusion 441 is provided on the upper surface of the connecting block 44, a lower protrusion 442 is provided on the lower surface of the connecting block 44, a positioning hole 31 is provided on the surface of the valve disc 3, the lower protrusion 442 is inserted into the positioning hole 31, and a mounting hole is provided on the pressing plate 41, the upper protrusion 441 is inserted into the mounting hole;

[0053] When the control valve is in normal use, there will be a gap between the pressure plate 41 and the valve disc 3, so that the lower end of the fixed rod 42 will be exposed to the working medium in the control valve. At this time, by installing a connecting block 44 between the pressure plate 41 and the valve disc 3, the exposed part of the fixed rod 42 is protected by the connecting block 44, so as to avoid the working medium from directly contacting the fixed rod 42 and causing adverse effects on the fixed rod 42, and to avoid the working medium from staying in the gap between the pressure plate 41 and the valve disc 3. At the same time, the installed connecting block 44 can also seal and protect the outlet 11 at the lower end of the through hole, thereby reducing the possibility of the working medium entering from the outlet 11 at the lower end of the through hole and reducing the possibility of leakage of the working medium.

[0054] At the same time, since the diameter of the fixing rod 42 is smaller than the diameter of the valve stem 4, and the fixing rod 42 is connected to the through hole by a thread, when the control valve is switched, it is easy to cause the valve disc 3 and the fixing rod 42 to have a tendency to rotate, thereby affecting the fixing effect of the fixing rod 42 in the through hole, causing the fixing rod 42 to move, affecting the normal use of the control valve. Therefore, a connecting block 44 is provided and the protrusion on the connecting block 44 is used to connect the pressure plate 41 and the valve disc 3, so that the valve stem 4, the fixing rod 42, the pressure plate 41 and the valve disc 3 can form a whole, thereby improving the stability of the control valve switch and preventing the fixing rod 42 from moving in the through hole, affecting the normal use of the control valve.

[0055] As an embodiment of the present invention, a mounting groove 412 is provided on the pressing plate 41, the bottom surface of the mounting groove 412 is inclined toward the fixing rod 42, a guide groove 413 is provided on the bottom surface of the mounting groove 412, the length direction of the guide groove 413 is the same as the radial direction of the mounting groove 412, and the upper protrusion 441 is located in the guide groove 413;

[0056] The connection block 44 has a deformation cavity 443 formed therein;

[0057] Since the bottom surface of the mounting groove 412 is inclined, the connecting block 44 will be deformed toward the fixing rod 42, thereby improving the sealing effect of the fixing rod 42 and the gap between the fixing rod 42 and the through hole, avoiding the possibility of leakage of the working medium in the control valve from the through hole. At the same time, a deformation cavity 443 is provided in the connecting block 44, which can facilitate the extrusion deformation of the connecting block 44 when the valve flap 3 is fitted with the pressure plate 41, thereby avoiding the hardness of the connecting block 44 being too high, which affects the fitting of the valve flap 3 and the pressure plate 41.

[0058] The specific workflow is as follows:

[0059] During operation, if there is a defect on the sealing surface between the valve seat 2 and the valve disc 3, resulting in leakage of the control valve, the valve cover 13 is opened, and the valve stem 4 and the valve disc 3 are taken out from the valve body 1. At the same time, if the defect is small, the sealing surface of the valve disc 3 and the valve seat 2 is ground to eliminate the defect on the sealing surface. If the defect is large, the valve disc 3 and the threaded valve seat 2 are disassembled and replaced to eliminate the defect.

[0060] At the same time, when the defects on the sealing surface cannot be eliminated by grinding, and the defects on the sealing surface have not reached the standard for replacing the valve disc 3 and the valve seat 2, in order to eliminate the defects on the sealing surface, the staff removes the closing bolt 43 in the through hole on the valve stem 4, and then twists the fixing rod 42 in the through hole to move the fixing rod 42 upward in the through hole, so that the valve disc 3 connected to the lower end of the fixing rod 42 moves upward, so that the valve disc 3 and the pressure plate 41 are closely attached to each other. At this time, when the control valve needs to be closed, the valve disc 3 will be inserted into the valve port on the valve seat 2 for sealing, and the pressure plate 41 will contact and squeeze the upper surface of the valve seat 2 for sealing;

[0061] At the same time, when the control valve fails and there is leakage of the working medium, the staff can directly rotate the fixing rod 42 to make the valve disc 3 and the pressure plate 41 contact each other, and then rotate the hand wheel 15 to drive the valve disc 3 and the pressure plate 41 to move downward, so that the valve disc 3 contacts the valve port and the pressure plate 41 contacts the upper surface of the valve seat 2, thereby completing the temporary repair of the control valve online;

[0062] At the same time, in the case of a lack of spare parts for the control valve or when the spare parts for the control valve are used up, such as when a ship is sailing at sea and there is a defect on the sealing surface of the control valve, resulting in the need to replace the faulty control valve, the sealing of the valve seat 2 can be temporarily repaired by the pressure plate 41;

[0063] By covering the surface of the thread with an elastic layer, the gap between the threads is filled to avoid leakage at the threads between the valve seat 2 and the valve body 1, and between the fixing rod 42 and the through hole. At the same time, through the covering elastic layer, when the control valve is closed, the valve seat 2 will be squeezed by the valve disc 3 to improve the sealing effect. Similarly, the closing bolt 43 will squeeze the fixing rod 42 to ensure that the position of the fixing rod 42 in the through hole is stable, thereby improving the sealing effect between the fixing rod 42 and the through hole.

[0064] A plurality of annular rings 411 are provided on the pressure plate 41 and the valve seat 2, so that when the pressure plate 41 and the valve seat 2 are in contact with each other, the annular rings 411 are in contact with each other to increase the sealing area between the pressure plate 41 and the valve seat 2, thereby improving the sealing effect;

[0065] When the pressing plate 41 contacts the upper surface of the valve seat 2, the pressing plate 41 is subjected to a downward force, so that the side surfaces of the pressing plate 41 and the annular ring 411 on the valve seat 2 contact and squeeze each other. At the same time, the pressing plate 41 and the annular ring 411 on the valve seat 2 do not contact each other's surface, so that when the pressing plate 41 moves downward and seals, there is always a gap between the pressing plate 41 and the annular ring 411 on the valve seat 2.

[0066] When the control valve is in normal use, there is a gap between the pressure plate 41 and the valve disc 3. At this time, the lower surface of the extrusion platform 421 contacts and squeezes the lower surface of the active cavity 422, and the sealing gasket 423 is used to seal the fixed rod 42 in the through hole.

[0067] At the same time, when the control valve fails and needs to be temporarily repaired by the pressing plate 41, the pressing plate 41 and the valve disc 3 are closely attached to each other, and the gap between the pressing plate 41 and the valve disc 3 disappears. At this time, the squeezing platform 421 will move upward, so that the upper surface of the squeezing platform 421 contacts and squeezes the upper surface of the active cavity 422, and the fixing rod 42 in the through hole is sealed by the sealing pad 423;

[0068] Since the upper end surface or the lower end surface of the movable cavity 422 is an inclined surface, when the extrusion platform 421 drives the sealing gasket 423 to contact and extrudes the upper end surface or the lower end surface of the movable cavity 422, the sealing gasket 423 will be deformed and moved toward the fixed rod 42, thereby fully improving the sealing effect of the sealing gasket 423 on the gap between the through hole and the fixed rod 42. At the same time, by arranging multiple groups of extrusion platforms 421 on the fixed rod 42, multiple seals can be formed in the through hole.

[0069] By installing a connecting block 44 between the pressure plate 41 and the valve disc 3, the exposed portion of the fixing rod 42 is protected by the connecting block 44. At the same time, the installed connecting block 44 can also seal the outlet 11 at the lower end of the through hole.

[0070] At the same time, since the diameter of the fixing rod 42 is smaller than the diameter of the valve stem 4, and the fixing rod 42 is connected in the through hole by a thread, when the control valve is switched, it is easy to cause the valve disc 3 and the fixing rod 42 to rotate, causing the fixing rod 42 to move. Therefore, by providing a connecting block 44 and using the protrusion on the connecting block 44 to connect the pressing plate 41 and the valve disc 3, the valve stem 4, the fixing rod 42, the pressing plate 41 and the valve disc 3 can form a whole, thereby improving the stability of the control valve switch;

[0071] Since the bottom surface of the mounting groove 412 is inclined, the connecting block 44 will be deformed toward the fixing rod 42, thereby improving the sealing effect of the fixing rod 42 and the gap between the fixing rod 42 and the through hole. At the same time, a deformation cavity 443 is provided in the connecting block 44 to facilitate the extrusion deformation of the connecting block 44 when the valve flap 3 is fitted with the pressure plate 41.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A marine pressure control valve structure, comprising a valve body (1), the valve body (1) being provided with an inlet (12) and an outlet (11), a valve seat (2) being installed in the valve body (1), a valve cover (13) being installed on the valve body (1), a valve stem (4) being installed on the valve cover (13), a valve flap (3) being installed at the lower end of the valve stem (4), the valve flap (3) and the valve seat (2) being matched with each other, a hand wheel (15) being installed at the upper end of the valve stem (4) via a fixing screw (151), a pressure cap (14) being installed on the valve cover (13), a pressure ring (141) and a packing (142) being installed between the pressure cap (14) and the valve cover (13) from top to bottom; Features: The valve seat (2) and the valve body (1) are fixedly mounted via threads; A through hole is provided in the valve stem (4), a fixing rod (42) is installed in the through hole, the fixing rod (42) and the upper ends of the through hole are provided with mutually meshing threads, a closing bolt (43) is installed at the opening of the through hole, the valve flap (3) is installed at the lower end of the fixing rod (42), a pressure plate (41) is installed at the lower end of the valve stem (4), a gap is provided between the pressure plate (41) and the valve flap (3), and the lower surface of the pressure plate (41) and the upper surface of the valve seat (2) cooperate with each other; A connecting block (44) is installed in the gap between the pressure plate (41) and the valve disc (3); the diameter of the connecting block (44) is less than or equal to the diameter of the upper end of the valve disc (3); and the connecting block (44) will deform when under pressure; An upper protrusion (441) is provided on the upper surface of the connecting block (44), a lower protrusion (442) is provided on the lower surface of the connecting block (44), a positioning hole (31) is provided on the surface of the valve flap (3), the lower protrusion (442) is inserted into the positioning hole (31), and a mounting hole is provided on the pressure plate (41), the upper protrusion (441) is inserted into the mounting hole; The pressing plate (41) is provided with a mounting groove (412), the bottom surface of the mounting groove (412) is inclined toward the fixing rod (42), the bottom surface of the mounting groove (412) is provided with a guide groove (413), the length direction of the guide groove (413) is the same as the radial direction of the mounting groove (412), and the upper protrusion (441) is located in the guide groove (413); A deformation cavity (443) is provided in the connecting block (44).

2. A marine pressure control valve structure according to claim 1, characterized in that: The threaded surfaces on the valve seat (2) and the fixing rod (42) are covered with an elastic layer.

3. A marine pressure control valve structure according to claim 1, characterized in that: A plurality of groups of annular rings (411) are arranged on the lower surface of the pressure plate (41) and the upper surface of the valve seat (2); the annular rings (411) on the pressure plate (41) and the valve seat (2) cooperate with each other, and the cross section of the annular rings (411) is trapezoidal.

4. A marine pressure control valve structure according to claim 3, characterized in that: The side surfaces of the pressure plate (41) and the annular ring (411) on the valve seat (2) contact and squeeze each other, the annular ring (411) on the pressure plate (41) does not contact the upper surface of the valve seat (2), and the annular ring (411) on the valve seat (2) does not contact the lower surface of the pressure plate (41).

5. A marine pressure control valve structure according to claim 1, characterized in that: The fixing rod (42) is provided with an extrusion platform (421), the inner wall of the through hole is provided with an active cavity (422), and sealing pads (423) are installed on the upper end surface and the lower end surface of the extrusion platform (421).

6. A marine pressure control valve structure according to claim 5, characterized in that: The upper end surface and the lower end surface of the movable cavity (422) are both inclined surfaces, and a plurality of groups of extrusion platforms (421) are provided on the fixed rod (42).

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