Inclined rod type safety valve

Abstract

The utility model discloses an inclined rod type safety valve, relates to the field of valves, and aims to solve the problems that the maintenance cost of a valve body is increased and even a pipeline is broken and the reaction is out of control due to sudden high pressure caused by the conditions of pressure drift and response delay after the conventional safety valve is used for a long time. The valve body is provided with an air inlet and an air outlet, the upper end of the air inlet is provided with a valve clack, the valve clack is fixedly connected with a valve rod, the valve rod is slidably connected with a gland, the gland is fixedly connected with the valve body, the valve rod at the upper end of the gland is sleeved with a pressing rod assembly which applies force to the valve rod downwards, and the pressing rod assembly is sleeved with a valve deck which is fixedly connected with the valve body. The pressure relief valve has the advantages that through the pressing rod assembly and the lifting rod assembly, downward pressure of the valve rod is stabilized, pressure drift is avoided, meanwhile, the response speed of the valve rod is increased, and therefore the purpose of quick pressure relief is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially is a kind of inclined rod type safety valve. BACKGROUND

[0002] As the core safety device of pressure vessel, safety valve is widely used in petroleum chemical industry, energy and power, aerospace and other fields, and its core function is to control internal pressure by automatic opening and closing to prevent explosion or leakage caused by overpressure of equipment. The widely used spring safety valve controls the valve opening and closing pressure by adjusting the spring compression amount, but its inherent defects limit its reliability in complex working conditions.

[0003] Firstly, when the spring is subjected to alternating load or high temperature environment (such as chemical reactor, boiler system) for a long time, metal fatigue or creep deformation is easy to occur, which leads to the decrease of spring stiffness, and the actual opening pressure deviates from the initial set value (drift amplitude can reach 10%-20%), therefore, to maintain accuracy, frequent shutdown calibration is needed, which increases maintenance cost and affects production continuity.

[0004] Secondly, after the valve is opened, the dynamic balance between spring resilience and medium pressure depends on the linear spring characteristics, while in actual overpressure working condition, the pressure change is nonlinear (such as explosive pressure rise), so the spring force and medium pressure cannot be matched in real time, which leads to insufficient valve opening or repeated opening and closing (frequent jump), limited pressure relief rate, and difficulty in timely releasing sudden high pressure (such as pipeline rupture, reaction out of control).

[0005] Finally, in high temperature, corrosive medium or vibration environment, the spring material is easy to age and fail, which further aggravates performance degradation. INVENTION CONTENTS

[0006] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an inclined rod type safety valve, which effectively solves the problems of pressure drift and response lag of the existing safety valve after long time use, thereby increasing the maintenance cost of valve body, and even causing pipeline rupture and reaction out of control due to sudden high pressure.

[0007] To achieve the above purpose, the utility model provides the following technical scheme: the utility model discloses a valve body and valve seat, the valve body is equipped with inlet and exhaust port, the inlet upper end is equipped with valve flap, the valve flap is fixedly connected with valve rod, the valve rod is slidably connected with gland, the gland is fixedly connected with the valve body, the valve rod on the upper end of the gland is sleeved with pressure rod assembly that exerts downward force on the valve rod, the pressure rod assembly is externally sleeved with valve cover, the valve cover is fixedly connected with the valve body, the upper end of the valve cover is fixedly connected with support, the support is hingedly connected with lever, the end of the lever is fixedly connected with lifting rod assembly that exerts upward force on the valve rod.

[0008] Preferably, the pressure rod assembly comprises an upper pressure ring, the upper pressure ring is fixedly connected with the valve cover, a through hole for the valve rod to pass through is arranged on the upper pressure ring, a spring is connected below the upper pressure ring, a lower pressure ring is connected below the spring, and the lower pressure ring is fixedly connected with the valve rod.

[0009] Preferably, a first sealing gasket is arranged between the valve cover and the support, an adjusting bolt is threadedly connected between the support and the valve rod, the lower end of the adjusting bolt is fixedly connected with the upper pressure ring, and a lock nut is threadedly connected with the upper end of the adjusting bolt.

[0010] Preferably, the pressure rod assembly further comprises a pressure sleeve, the pressure sleeve is sleeved on the outside of the valve rod, the upper end of the pressure sleeve is fixedly connected with the lower pressure ring, and a lower adjusting ring is fixedly connected with the lower end of the pressure sleeve, the lower adjusting ring is located outside the valve flap, and an O-shaped sealing ring is arranged between the lower adjusting ring and the valve rod.

[0011] Preferably, the lifting rod assembly comprises a hinge, one end of the hinge is fixedly connected with the lever, the other end of the hinge is provided with a sliding groove for the valve rod to slide, the width of the sliding groove is greater than the diameter of the valve rod, a limiting nut is fixedly connected with the valve rod on the upper side of the sliding groove, and a first fixed nut is matched with the upper end of the limiting nut.

[0012] Preferably, a second sealing gasket is arranged between the pressure cover and the valve cover, and a stud and a second fixed nut are matched with the valve rod.

[0013] Preferably, a plug hole is formed in the valve body, and a plug is matched in the plug hole.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] The utility model discloses a valve rod lifting device, which comprises a valve body, a valve cover, a valve rod, a support, a pressure cover, a pressure rod assembly and a lifting rod assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the whole structure schematic diagram of the utility model.

[0017] Fig. 2 It is the support connecting structure schematic diagram of the utility model.

[0018] Fig. 3 It is the valve body connecting structure schematic diagram of the utility model.

[0019] The reference signs in the drawing: 1, valve body; 2, valve seat; 3, screw plug; 4, valve disc; 5, lower adjusting ring; 6, gland; 7, valve cover; 8, lower pressing ring; 9, spring; 10, upper pressing ring; 11, first sealing gasket; 12, locking nut; 13, adjusting bolt; 14, bracket; 15, limiting nut; 16, first fixing nut; 17, hinge; 18, lever; 19, valve stem; 20, pressing sleeve; 21, stud; 22, second fixing nut; 23, second sealing gasket; 24, O-shaped sealing ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without any creative work fall within the protection scope of the utility model.

[0021] Please refer to the drawings Figs. 1-3 The utility model discloses a kind of inclined rod type safety valves in the embodiment: including valve body 1 and valve seat 2, the valve body 1 is equipped with air inlet and exhaust port, the air inlet upper end is equipped with valve disc 4, the valve disc 4 is fixedly connected with valve stem 19, the valve stem 19 is slidably connected with gland 6, the gland 6 is fixedly connected with the valve body 1, the valve stem 19 is sleeved with pressure rod assembly to the valve stem 19 downward force on the gland 6 upper end, the pressure rod assembly is sleeved with valve cover 7 outside, the valve cover 7 is fixedly connected with the valve body 1, the valve cover 7 upper end is fixedly connected with bracket 14, the bracket 14 is hingedly connected with lever 18, the lever 18 end is fixedly connected with lifting rod assembly to the valve stem 19 upward force.

[0022] The air inlet of the valve body 1 is in communication with the system, and the air outlet of the valve body 1 is in communication with the external air pressure. In the initial stage, the valve flap 4 at the upper end of the air inlet is located above the air inlet, and the valve flap 4 has a plugging effect on the air inlet, so that the air pressure in the system is prevented from being discharged, and the purpose of rapid pressure rise is achieved. The valve rod 19 is located above the valve flap 4, and the pressure rod assembly on the valve rod 19 has a downward force on the valve rod 19. The lifting rod assembly at the upper end of the valve rod 19 has an upward force on the valve rod 19. In the initial state, the upward force of the lifting rod assembly is less than the combined force of the downward force of the pressure rod assembly and the weight of the valve rod 19. In this way, the valve flap 4 plays a plugging role on the air inlet under certain pressure conditions. The valve seat 2 connected with the valve body 1 and the valve rod 19 adopt typical structures in the prior art. The valve seat 2 forms a linear seal with the valve flap 4 to ensure zero leakage in the closed state. The valve cover 7 and the valve body 1 are installed in a split type through the stud 21 and the second fixing nut 22. The second sealing gasket 23 is installed between the valve rod 19 and the pressure cover 6. The second sealing gasket 23 is made of flexible material to prevent medium leakage. The lever 18 is located to the right of the valve rod 19. The hinge point of the lever 18 and the bracket 14 is close to the left end of the lever 18. In this way, when the right side of the lever 18 falls downward, the left end of the lever 18 can provide greater force to the valve rod 19. In the case of sudden high pressure, the valve rod 19 is quickly moved upward to achieve rapid pressure relief of the system.

[0023] The pressure rod assembly provides downward pressure by the spring 9. The upper pressure ring 10 is located at the upper end of the spring 9, and the upper pressure ring 10 limits the upper end of the spring 9. The lower pressure ring 8 limits the lower end of the spring 9. In the initial state, the spring 9 is compressed between the upper pressure ring 10 and the lower pressure ring 8. The upper pressure ring 10 is fixed on the valve cover 7, and the valve cover 7 is fixed. In this way, the pressure of the spring 9 acts on the valve rod 19 through the lower pressure ring 8, and the valve rod 19 has a downward force on the valve flap 4. In this way, the valve flap 4 will not be separated from the air inlet when the pressure in the system is too low. Further, in order to adjust the initial force of the spring 9, the upper pressure ring 10 is fixedly connected with the valve cover 7 through the adjusting bolt 13. The adjusting bolt 13 is provided with a thread. By rotating the adjusting bolt 13, the distance between the upper pressure ring 10 and the upper end of the valve cover 7 can be adjusted, so as to adjust the distance between the upper pressure ring 10 and the lower pressure ring 8, change the initial extension amount of the spring 9, and adjust the initial force of the spring 9 on the lower pressure ring 8. The upper end of the adjusting bolt 13 is fixed by the locking nut 12.

[0024] In order to guarantee the sealing between the valve cover 7 and the bracket 14, the first sealing pad 11 is installed between the valve rod 19 and the bracket 14, and the lower end of the lower pressing ring 8 is connected to the pressing sleeve 20 and the lower adjusting ring 5, the pressing sleeve 20 penetrates the pressing cover 6, and the O-shaped sealing ring 24 is arranged between the pressing sleeve 20 and the valve rod 19, so that the air leakage between the pressing sleeve 20 and the valve rod 19 is avoided, and the lower adjusting ring 5 can increase the upward acting area of the gas in the air inlet, so that the valve rod 19 can be driven to move upward more quickly after the valve disc 4 is opened, and the purpose of rapid pressure relief is achieved.

[0025] The hinge 17 in the lifting rod assembly is used for connecting the lever 18 and the valve rod 19, one end of the hinge 17 is fixedly installed on the lever 18, the connecting point of the hinge 17 and the lever 18 is located on the left side of the hinge joint point of the lever 18, and the other end of the hinge 17 is placed below the limiting nut 15 through a sliding groove, the sizes of the limiting nut 15 and the first fixed nut 16 are greater than the size of the sliding groove, since the lever 18 moves in an arc line during rotation, the sliding groove at the other end of the hinge 17 is provided with a relatively long width, so that the hinge 17 can make the valve rod 19 have sufficient transverse moving distance to avoid movement interference during rotation, and the vertical movement of the valve rod 19 is guaranteed.

[0026] The left side of the valve body 1 is provided with a plug hole, the plug hole is communicated with the outside, and the plug 3 in the plug hole plays a plugging role on the plug hole.

[0027] The overall working process of the utility model is as follows: the pressure of the adjusting stud, the upper pressing ring and the adjusting spring is adjusted, the lower pressing ring, the pressing sleeve, the lower adjusting ring and the valve disc are pressed on the valve seat, and the opening and closing of the valve are controlled by the elastic pressure of the spring. When the pressure in the system exceeds the working pressure set by the safety valve, the spring is compressed, the valve disc is opened, and the steam or other medium is discharged through the gap between the valve disc and the valve seat, so that the pressure in the system is reduced. When the system pressure drops below the set pressure of the safety valve, the spring returns to its original state, the valve disc is closed again, and the system pressure is maintained within the safety range again.

[0028] The specific working process of the safety valve is as follows: when the steam pressure acting on the valve disc of the safety valve exceeds the compression force of the spring, the valve disc is opened. The discharged steam is bounced by the lower adjusting ring, so that the valve is quickly opened. At the same time, the lever drives the hinge to rotate, and the valve rod and the valve disc are further driven to move upward quickly by relying on the weight principle of the long handle lever, so that the valve is quickly opened; with the upward movement of the valve disc, the steam impacts on the lower adjusting ring, so that the steam discharge direction tends to be vertical downward, the reaction force generated by the steam discharge pushes the valve disc upward, and the valve disc is kept at a sufficient lifting height within a certain pressure range; with the opening of the safety valve, the steam is continuously discharged, and the steam pressure in the system is gradually reduced. At this time, the force of the spring will overcome the steam pressure acting on the valve disc and the reaction force of the steam discharge, so as to close the safety valve.

[0029] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A tilting lever safety valve characterized by: The utility model provides a valve, including valve body (1) and valve seat (2), the valve body (1) is equipped with air inlet and exhaust port, the air inlet upper end is equipped with valve clack (4), valve clack (4) is fixedly connected with valve rod (19), valve rod (19) is connected with gland (6) slidingly, the gland (6) is fixedly connected with valve body (1), the valve rod (19) of the upper end of gland (6) is sleeved with the pressure lever assembly of valve rod (19) to the downward force, the pressure lever assembly is sleeved with valve cover (7) outside, valve cover (7) is fixedly connected with valve body (1), the upper end of valve cover (7) is fixedly connected with support (14), support (14) is hingedly connected with lever (18), the end of lever (18) is fixedly connected with the lifting lever assembly of valve rod (19) to the upward force.

2. A tilting lever safety valve according to claim 1, wherein: The pressure lever assembly includes an upper compression ring (10) fixedly connected with the valve cover (7), the upper compression ring (10) is provided with a through hole for the valve rod (19) to pass through, the lower side of the upper compression ring (10) is connected with a spring (9), the lower side of the spring (9) is connected with a lower compression ring (8), and the lower compression ring (8) is fixedly connected with the valve rod (19).

3. A tilting lever safety valve according to claim 2, wherein: A first sealing gasket (11) is installed between the valve cover (7) and the support (14), an adjusting bolt (13) is threadedly connected between the support (14) and the valve rod (19), the lower end of the adjusting bolt (13) is fixedly connected with the upper compression ring (10), and the upper end of the adjusting bolt (13) is threadedly connected with a locking nut (12).

4. A tilting lever safety valve according to claim 2, wherein: The pressure lever assembly further includes a pressure sleeve (20) sleeved on the outside of the valve rod (19), the upper end of the pressure sleeve (20) is fixedly connected with the lower compression ring (8), the lower end of the pressure sleeve (20) is fixedly connected with a lower adjusting ring (5), the lower adjusting ring (5) is located outside the valve clack (4), and an O-shaped sealing ring (24) is installed between the lower adjusting ring (5) and the valve rod (19).

5. A tilting lever safety valve as claimed in claim 1 wherein: The lifting lever assembly includes a hinge (17), one end of the hinge (17) is fixedly connected with the lever (18), the other end of the hinge (17) is provided with a sliding groove for the valve rod (19) to slide, the width of the sliding groove is greater than the diameter of the valve rod (19), the valve rod (19) on the upper side of the sliding groove is fixedly connected with a limiting nut (15), and the upper end of the limiting nut (15) is matched with a first fixed nut (16).

6. A tilting lever safety valve as claimed in claim 1, wherein: A second sealing gasket (23) is installed between the gland (6) and the valve cover (7), and a stud (21) and a second fixed nut (22) are matched on the valve body (1) and the valve rod (19).

7. A tilting lever safety valve as claimed in claim 1 wherein: A plug hole is formed in the valve body (1), and a plug (3) is matched in the plug hole.

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