CN111076924A - Safety valve testing device and method - Google Patents
Safety valve testing device and method Download PDFInfo
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- CN111076924A CN111076924A CN201911419032.4A CN201911419032A CN111076924A CN 111076924 A CN111076924 A CN 111076924A CN 201911419032 A CN201911419032 A CN 201911419032A CN 111076924 A CN111076924 A CN 111076924A
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- 238000013461 design Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
The invention relates to a safety valve testing device and a testing method, wherein the safety valve testing device comprises a testing container, wherein a testing interface for mounting a tested safety valve is arranged on the testing container; the pair of sliding rods is arranged on the periphery of the test interface; the limiting device is sleeved on the sliding rod at two ends and can slide up and down along the sliding rod; and a pressure sensor used for abutting against the safety valve to be tested so as to collect the pressure borne by the safety valve to be tested during the test is arranged on one side of the limiting stopper opposite to the test interface. The safety valve testing device can complete the test of whether the acting force generated by the flow channel structure form of the safety valve is matched with the spring stiffness or not, and judge whether the acting force generated by the flow channel structure form on the valve clack is matched with the spring stiffness or not reasonably.
Description
Technical Field
The invention relates to the technical field of safety valves, in particular to a safety valve testing device and a safety valve testing method.
Background
According to the requirements of 'spring direct load type safety valve' GB/T12243, the technical indexes for evaluating the safety valve are 8 indexes: shell strength, sealing performance, setting pressure, discharge pressure, recoil pressure, opening height, mechanical characteristics and displacement coefficient.
We found in the development of safety valve tests: the technical indexes such as discharge pressure, recoil pressure, opening height, mechanical characteristics, displacement coefficient and the like are all related to the rigidity of the safety valve spring. Therefore, the selection of the spring stiffness has a great influence on the design, manufacture and safe use of the safety valve.
The selection of the spring stiffness of the safety valve generally has no fixed formula, and generally, each company and each designer preset a stiffness according to own experience and then calculate to see whether the stiffness meets the requirements of other technical indexes according to a design program. And after the requirements are met, performing a type test to verify whether the design and the reality meet the requirements.
This kind of mode is because to carry out the type test, and the type test needs the relief valve to install and finishes, and different relief valves need to change different springs.
Disclosure of Invention
The invention aims to provide a safety valve testing device and a safety valve testing method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a safety valve testing device is constructed, comprising
The test container is provided with a test interface for mounting the tested safety valve; the pair of sliding rods is arranged on the periphery of the test interface; the limiting device is sleeved on the sliding rod at two ends and can slide up and down along the sliding rod; and a pressure sensor used for abutting against the safety valve to be tested so as to collect the pressure borne by the safety valve to be tested during the test is arranged on one side of the limiting stopper opposite to the test interface.
Preferably, the hydraulic actuator is connected with the limiter and used for driving the limiter to move.
Preferably, the hydraulic actuator comprises a hydraulic telescopic part connected with the limiter; and
and the hydraulic device is connected with the hydraulic telescopic part and is used for controlling the hydraulic telescopic part to stretch and further controlling the stopper to move.
Preferably, the test container is further provided with a pressure gauge for testing and displaying the real-time pressure of the test container.
Preferably, the pressure sensor further comprises a terminal connected with the pressure sensor and used for processing the pressure value collected by the pressure sensor.
Preferably, the sliding rod is provided with scales.
Preferably, the test device further comprises an air storage tank connected with the test container through a pipeline and used for supplying test media to the test container.
Preferably, the pipeline is provided with a regulating valve for controlling the conveying amount of the test medium, an
A check valve for preventing the test medium from flowing backwards is arranged;
and the test container is also provided with a protective safety valve for preventing the test container from being overpressurized.
A test method for the safety valve test device comprises the following steps:
s1: mounting the tested safety valve with the spring taken out on the test interface;
s2: adjusting the limiting stopper to a preset position;
s3: raising the pressure of the test container to enable the tested safety valve to be in a discharge state, enabling a valve rod of the tested safety valve to move upwards and abut against the pressure sensor, and acquiring a discharge pressure value F by the pressure sensorRow board；
S4: reducing the pressure of the test container until 85% of the set pressure of the tested safety valve, driving the limiting stopper to slowly press down until the tested safety valve is closed, and acquiring a maximum pressure value F of the tested safety valve in the descending process by the pressure sensorSeal for a motor vehicle。
Preferably, the preset height is 1/4d above the valve rod of the tested safety valve in a closed state0，d0The area of the flow passage of the safety valve to be detected.
Preferably, the pressure F borne by the tested safety valve when the safety valve is openedOpening deviceComprises the following steps:
Fopening device＝A*P
Wherein, A: the valve clack area under the valve seat sealing ring of the tested safety valve is corresponding to the valve clack area;
p: the pressure measured by the pressure gauge when the tested safety valve is opened;
maximum value K of spring stiffness of the measured safety valveSettingIs composed of
KSetting＝(FRow board-FOpening device)/1/4d0；
Minimum value K of the spring rate of the safety valve to be testedSeal for a motor vehicleIs composed of
KSeal for a motor vehicle＝(FRow board-FSeal for a motor vehicle)/1/4d0
When the spring stiffness K of the design of the safety valve to be tested is as follows: kSeal for a motor vehicle≤K≤KSettingThe spring stiffness is reasonably designed; otherwise, it is not reasonable.
The implementation of the invention has the following beneficial effects: the safety valve testing device can complete the test of whether the acting force generated by the flow channel structure form of the safety valve is matched with the spring stiffness or not, and judge whether the acting force generated by the flow channel structure form on the valve clack is matched with the spring stiffness or not reasonably.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1, 2 and 3 are schematic views of the working principle of the safety valve;
fig. 4 is a schematic structural view of the safety valve testing device of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
As shown in fig. 1 to 3, the working principle of the safety valve in the present embodiment is as follows:
under normal operating conditions, the safety valve is in a closed state. And when the working pressure of the equipment reaches the setting pressure of the safety valve, the safety valve is opened. When the safety valve is just opened, because the safety valve adopts the helping hand effect device (recoil dish 102) in design, the air current flows out the valve seat, under the effect of recoil dish 102 and regulation circle 103, the blowout air current flow direction changes (the air current flows downwards), simultaneously, because recoil dish 102 and valve clack are as an organic whole, recoil dish 102 is under the effect of the reaction force of air current, upward movement.
When the safety valve is not opened, the spring generates a certain amount of compression, and the compression generates a downward acting force to keep acting on the valve clack so that the safety valve is in a sealing state.
After the safety valve is opened, under the action of air flow on the valve clack, the valve clack moves upwards, and meanwhile, a spring of the safety valve is further compressed, so that larger downward reaction force is generated. When the downward reaction force generated by the spring is balanced with the reaction force of the recoil disc 102 in the air flow, the valve clack and the valve rod of the safety valve reach certain opening height, and the corresponding discharge state is maintained and kept. At this time, the relief valve reaches a predetermined opening height, and the equipment pressure reaches the discharge pressure.
Technically, the rigidity of the spring is selected to be proper to ensure that the working pressure of the protected equipment exceeds a certain working pressure but does not exceed a certain specified pressure (for example, the safety valve for air cannot exceed 1.1 times of the set working pressure), the safety valve is opened, and in the process of discharging gas, the valve clack generates an upward acting force under the action of gas flow and compresses the spring; at the moment, the opening height of the valve rod is required by safety technical specifications, and the opening height of the valve rod must reach 1/4d0(d0The area of the relief valve flow path). I.e. the spring compression after the safety valve is opened is 1/4d0It generates a downward force equal to or less than the reaction force of the airflow against the recoil plate 102.
The spring rate index determined by this process is typically the "upper desired rate" (maximum rate). If the spring rate is greater than this maximum rate, at the same amount of spring compression (1/4 d)0) The spring generates a larger force, which causes the opening height of the spring to be less than 1/4d0Thus, the requirements of safety specifications are not met.
When the safety valve is opened to a predetermined opening height, the safety valve is returned (the safety valve is closed). According to the related theory, the force required when the safety valve is closed is related to the working pressure of equipment, the inner diameter of the sealing surface and the width of the sealing surface, and is a relatively constant value, and the value is not directly related to the spring stiffness. The related theory proposes the concept of "minimum specific seal pressure" accordingly. This determination of the "minimum specific seal pressure" is not within the context of the present invention, and we only confirm that: the required force when the safety valve is closed is related to the working pressure of equipment, the inner diameter of the sealing surface and the width of the sealing surface and is a relatively constant value.
In addition, the regulatory standard requires that the seat return meets the safety requirement under the setting pressure of not less than 85%. Therefore, when the valve rod of the safety valve reaches the maximum opening height and the spring compression amount reaches the maximum, the stress is maximum; after the safety valve removes a large amount of gas media, the pressure of the equipment is reduced, the force of spring compression is greater than the lifting force of a valve clack generated by airflow, the spring compression is changed into rebound, finally, the safety valve is closed, the valve rod is reset, the safety valve returns to a seat, and at the moment, the working pressure of the equipment is not less than 85% of the setting pressure.
The spring rate index determined by this process is typically the "lower required rate" (minimum rate). Here, it can be understood that: after the valve rod of the safety valve reaches the highest opening height; the safety valve returns to the seat, and the rebound quantity of the spring of the safety valve is 1/4d0It produces a spring back force greater than the minimum seal force (as determined by the minimum specific seal pressure above). Here, the greater the stiffness, the greater the resilience, and the easier the recoiling is.
The above analysis shows that: the lower the spring stiffness is, the more beneficial the opening of the safety valve is; the higher the spring rate, the more advantageous the closure of the safety valve. It follows that the importance of the spring rate selection.
As shown in FIG. 4, the safety valve testing device of the present embodiment comprises
The test container 1 is equipped with the test interface 11 that supplies to be surveyed the installation of relief valve 100 on the test container 1 to and locate a pair of slide bar 2 of test interface 11 outlying, still include both ends cover locate on slide bar 2, can follow slide bar 2 gliding stopper 3 from top to bottom, stopper 3 is equipped with the pressure sensor 4 that is used for the butt to be surveyed relief valve 100 in order to gather the pressure that receives when being surveyed relief valve 100 is experimental with test interface 11 one side.
In this embodiment, the safety valve 100 to be tested is a spring direct load type safety valve, and the size of the test interface 11 can be adjusted according to the specification of the safety valve 100 to be tested.
A pair of sliding rods 2 are symmetrically arranged on the periphery of the test interface 11, the sliding rods 2 provide limiting and tracks for the stopper 3 to slide up and down, and can be metal rods, and furthermore, the sliding rods 2 are provided with scales so that an operator can know displacement parameters of the stopper 3 conveniently. In some embodiments, a distance measuring sensor, such as an infrared distance measuring sensor, or a laser distance measuring sensor, may be further provided, the emitting end of the laser distance measuring sensor may be disposed on the stopper 3, and a reflection plate may be disposed around the testing interface 11, so that the distance measuring sensor tests the displacement parameter of the stopper 3. In some embodiments, the number of the sliding rods 2 may be three, which are distributed symmetrically in a triangular manner.
The limiter 3 can be a flat plate structure or a circular plate structure, through holes are formed at two ends of the limiter to be sleeved on the slide bar 2, and further, an installation groove is formed in the limiter 3 to install and fix the pressure sensor 4. Of course, the installation groove may not be provided, and the pressure sensor 4 may be provided on the flat surface of the stopper 3.
Further, the pressure sensor 4 may include a pressure sensing unit and a data processing unit, the pressure sensing unit directly collects the relevant pressure, and the data processing unit processes the pressure into a relevant pressure value, in some embodiments, the pressure sensor further includes a terminal connected to the pressure sensor 4 and configured to process the pressure value collected by the pressure sensor 4, the terminal is connected to the pressure sensor 4 through a data line, and further reads the relevant pressure collected by the pressure sensor 4 and processes the pressure value into a relevant specific pressure value, of course, the terminal may also directly send the collected data information to the terminal through a communication module, the communication module may be a WIFI module, a bluetooth module, a 3G/4G/5G module, a Zigbee module, and the like, which may be selected according to actual needs, and the terminal may be a mobile phone, a tablet computer, a notebook computer, a mobile phone, one or more of a palm computer, a PAD, a smart watch and a smart bracelet, which has relevant processing capacity. Of course, the pressure processor 4 may also be connected to a display unit, such as an LCD screen, for visually displaying the relevant values, or directly displayed by a terminal equipped with the display unit.
Further, the testing device further comprises a hydraulic actuating mechanism 5 connected with the stopper 3 and used for driving the stopper 3 to move, wherein the hydraulic actuating mechanism 5 comprises a hydraulic telescopic part 51 connected with the stopper 3 and a hydraulic device 52 connected with the hydraulic telescopic part 51 and used for controlling the hydraulic telescopic part 51 to stretch and further controlling the stopper 3 to move. The hydraulic actuator may be a hydraulic cylinder comprising a cylinder barrel and a piston rod that is retractable into and out of the cylinder barrel, and the hydraulic telescoping section 51 may be the piston rod. Further, the hydraulic actuator 5 may be connected to the aforementioned terminal, and the terminal sends a control signal to the hydraulic actuator 5 to control the operating state of the hydraulic actuator 5, and further control the expansion amount of the hydraulic expansion part 51 to adjust the position of the stopper 3.
It can be understood that the hydraulic actuator 5 ensures that the stopper 3 is fixed after reaching a certain opening height, and can drive the stopper 3 to move from top to bottom, and the movement from bottom to top is driven by the valve rod 101 to move upwards under the driving of the valve flap.
Further, the test container 1 is further provided with a pressure gauge 6 for testing and displaying the real-time pressure of the test container 1, and the pressure gauge may be one or multiple, for example, one pressure gauge is arranged right above the test container 1 or close to the test interface 11, and the other pressure gauge is arranged at the bottom of the test container 1, so as to detect whether the pressures of the upper side and the lower side of the test container 1 are within a required range.
Further, the device also comprises an air storage tank 7 which is connected with the test container 1 through a pipeline and is used for supplying test media to the test container 1.
Furthermore, a regulating valve 8 for controlling the conveying amount of the test medium and a check valve 9 for preventing the test medium from flowing backwards are arranged on the pipeline, and a protective safety valve 10 for preventing the test container 1 from being overpressured is also arranged on the test container 1. The protection safety valve 10 is an overpressure protection device of a test system, and prevents accidents caused by overpressure of the test container 1.
A test method for the safety valve test device comprises the following steps:
s1: mounting the tested safety valve 100 with the spring taken out on the test interface 11;
in this step, the safety valve to be tested is mounted on the test interface of the tester, and the spring of the safety valve is removed so that the valve stem 101 is not subjected to the spring force.
S2: adjusting the position limiter 3 to a preset position;
in the step, the preset height is 1/4d0 above the valve rod 101 of the tested safety valve 100 in a closed state, d0 is the flow area of the tested safety valve 100, namely the tested safety valve 100 is provided with the stopper 3 at the height of 1/4d0 above the valve rod, and in order to ensure that the stopper 3 is fixed, the stopper 3 is fixed at 1/4d in the test process through the pre-jacking force of the hydraulic actuating mechanism 50At the height. The effect of the pressure sensor 4 is that during testing, the valve stem 101 is lifted 1/4d0Height, which exerts a force on the pressure sensor 4, and the upward force of this valve stem 101 is collected by the pressure sensor 4.
S3: the pressure of the test container 1 is increased, so that the tested safety valve 100 is in a discharge state, the valve rod of the tested safety valve 100 moves upwards and abuts against the pressure sensor 4, and the pressure sensor 4 acquires a discharge pressure value FRow board；
In this step, the pressure of the gas in the test container 1 is raised through the gas storage tank 7 and the regulating valve 8, and reaches the safety valve design condition, that is, the pressure in the test container 1 reaches the safety valve design condition, so that the safety valve is in the discharge state, that is, we define the discharge pressure of the tested safety valve 100. The air in the test container 1 flows through the valve seat (nozzle), the recoil plate 102 and finally out of the tested safety valve 100. During the flow, an upward lifting force is generated on the flap, causing the valve stem 101 to move upwards until it reaches the stop 3, acting on the pressure sensor 4, generating a pressure which is read by the pressure sensor 4 or the terminal connected thereto. This force is the upward force generated by the valve stem 101 when the measured relief valve 100 reaches discharge pressure.
It will be appreciated that the pressure read is the measured pressureWhen the spring is installed during normal operation of the full valve 100, the spring is compressed 1/4d0The downward force generated by the discharge pressure condition is reached. This force is balanced by the upward force of the fluid on the valve flap. Therefore, the read pressure value is the working force of the spring under the actual working condition of the safety valve 100. The magnitude of the working force of the spring is greatly related to the shape of the flow path of the safety valve 100 to be tested. The flow channel has excellent shape design, the upward force formed by the airflow is large, the force is large, the valve is beneficial to opening, and the specified opening degree is reached.
S4: reducing the pressure of the test container 1 until 85% of the set pressure of the tested safety valve 100, driving the limiting stopper 3 to slowly press down until the tested safety valve 100 is closed, and acquiring the maximum pressure value F of the tested safety valve 100 in the descending process by the pressure sensor 4Seal for a motor vehicle。
In the step, the working pressure of the test container 1 is reduced by reducing the opening of the regulating valve 8 until 85% of the set pressure of the tested safety valve 100 is reached, and then the valve rod 101 is slowly pressed down by the hydraulic actuator 5 until the valve rod is closed; during the process from the set height (1/4d0) to the closing, the pressure of the valve rod 101 to the pressure sensor 4 is recorded at the same time, and the maximum pressure value is found out, wherein the value is defined as FSeal for a motor vehicle(force applied when seal is closed).
It will be appreciated that the safety valve will return to its seat in addition to opening, since there is an upward thrust on the flap due to the flow of fluid after the valve stem has reached a certain opening height. Therefore, the downward force of the spring required for reseating must be greater than the force necessary to close the safety valve, i.e.: the force determined by the minimum specific seal pressure. Therefore, the regulatory standard requires that the seat return meets the safety requirement under 85% of the setting pressure.
Therefore, the stopper 3 is slowly depressed by the hydraulic actuator 5 under the condition that the set pressure (relief valve opening pressure) of the test container is maintained at 85%, and the valve stem 101 is 1/4d0Until it drops to zero, the downward force collected by the pressure sensor 4 is recorded and the maximum pressure value is defined as FSeal for a motor vehicle。
Further, in the above-mentioned case,to obtain spring force (F)Row boardForce applied at discharge), spring displacement (1/4 d)0)、FOpening device(stress when opening), because the stiffness of the spring is in a linear unique value in the working range of the spring, the stiffness of the spring based on the set pressure can be calculated according to Hooke's law, and the pressure F borne by the tested safety valve 100 when openingOpening deviceComprises the following steps:
Fopening device＝A*P
Wherein, A: the area of the valve flap corresponding to the valve seat seal ring of the tested safety valve 100, as shown in fig. 1-3, can be converted by removing the tested safety valve 100 and measuring the inner diameter thereof;
p: the pressure measured by the pressure gauge 6 when the measured safety valve 100 is opened or the pressure measured by the pressure sensor 4;
maximum value K of spring rate of measured safety valve 100SettingIs KSetting＝(FRow board-FOpening device)/1/4d0(ii) a The above is the spring rate determined based on the set pressure. It is emphasized here that the stiffness calculated here is due to 1/4d0The limiting value of the safety valve can be higher after the spring is actually installed, and the smaller the actual spring stiffness is, the more the safety valve is opened. This is therefore the maximum value of the spring rate we tested.
Minimum value K of spring rate of measured safety valve 100Seal for a motor vehicleIs composed of
KSeal for a motor vehicle＝FRow board-FSeal for a motor vehicle/1/4d0
When the spring rate K of the tested safety valve 100 is designed as follows: kSeal for a motor vehicle≤K≤KSettingThe spring stiffness is reasonably designed; otherwise, it is not reasonable.
The safety valve testing device can test whether the acting force generated by the flow passage structure form of the safety valve is matched with the rigidity of the spring. In the design, manufacture and detection links of the safety valve, the instrument judges whether the acting force generated by the flow channel structure form on the valve clack is reasonably matched with the spring stiffness through testing the acting force generated by the flow channel structure form formed by the valve seat and the valve clack under the corresponding working conditions (pressure, temperature, fluid speed and the like of a certain medium). The testing device is simple in structure and high in accuracy of testing related parameters.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (11)
1. A safety valve testing device is characterized by comprising
The device comprises a test container (1), wherein a test interface (11) for mounting a safety valve (100) to be tested is arranged on the test container (1); and a pair of sliding rods (2) arranged on the periphery of the test interface (11); the device also comprises a limiter (3) of which two ends are sleeved on the sliding rod (2) and can slide up and down along the sliding rod (2); and a pressure sensor (4) used for abutting against the tested safety valve (100) to collect pressure borne by the tested safety valve (100) during testing is arranged on one side of the limiter (3) opposite to the testing interface (11).
2. The safety valve testing device according to claim 1, further comprising a hydraulic actuator (5) connected to the stopper (3) for driving the stopper (3) to move.
3. The safety valve testing device according to claim 2, characterized in that the hydraulic actuator (5) comprises a hydraulic telescopic part (51) connected with the stopper (3); and
and the hydraulic device (52) is connected with the hydraulic telescopic part (51) and is used for controlling the hydraulic telescopic part (51) to stretch and further controlling the stopper (3) to move.
4. The safety valve testing device according to claim 3, characterized in that a pressure gauge (6) for testing and displaying the pressure of the test container (1) is further provided on the test container (1).
5. The safety valve testing device according to claim 4, characterized in that it further comprises a terminal connected to the pressure sensor (4) for processing the pressure values acquired by the pressure sensor (4).
6. The safety valve testing device according to claim 5, characterized in that the slide rod (2) is provided with a scale.
7. The safety valve testing device according to claim 6, further comprising a gas tank (7) connected to the test container (1) by a pipeline for supplying a test medium to the test container (1).
8. The safety valve testing device according to claim 7, characterized in that the pipeline is provided with a regulating valve (8) for controlling the test medium delivery, and
a check valve (9) for preventing the test medium from flowing backwards is arranged;
the test container (1) is also provided with a protective safety valve (10) for preventing overpressure of the test container (1).
9. A test method for the safety valve test device according to any one of claims 4 to 8, characterized by comprising the steps of:
s1: mounting the tested safety valve (100) with the spring taken out on the test interface (11);
s2: adjusting the limiting stopper (3) to a preset position;
s3: increasing the pressure of the test container (1) to enable the tested safety valve (100) to be in a discharge state, enabling a valve rod of the tested safety valve (100) to move upwards and abut against the pressure sensor (4), and enabling the pressure sensor (4) to acquire discharge pressureValue FRow board；
S4: reducing the pressure of the test container (1) until 85% of the set pressure of the tested safety valve (100), driving the limiting stopper (3) to slowly press down until the tested safety valve (100) is closed, and acquiring a maximum pressure value F in the descending process of the tested safety valve (100) by the pressure sensor (4)Seal for a motor vehicle。
10. Test method according to claim 9, characterized in that said predetermined height is 1/4d above the valve stem (101) of said safety valve under test (100) in the closed condition0，d0The flow area of the safety valve (100) to be tested.
11. Test method according to claim 10, characterised in that said safety valve (100) under test is subjected to a pressure F when openedOpening deviceComprises the following steps:
Fopening device＝A*P
Wherein, A: the valve clack area under the valve seat sealing ring of the tested safety valve (100) corresponds to;
p: the pressure measured by the pressure gauge (6) when the measured safety valve (100) is opened;
a maximum value K of the spring rate of the measured safety valve (100)SettingIs composed of
KSetting＝(FRow board-FOpening device)/1/4d0；
Minimum value K of the spring rate of the measured safety valve (100)Seal for a motor vehicleIs composed of
KSeal for a motor vehicle＝(FRow board-FSeal for a motor vehicle)/1/4d0
When the spring stiffness K of the design of the safety valve (100) to be tested is as follows: kSeal for a motor vehicle≤K≤KSettingThe spring stiffness is reasonably designed; otherwise, it is not reasonable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610016A (en) * | 2020-06-23 | 2020-09-01 | 吴江市东吴机械有限责任公司 | Safety valve performance testing tool and method |
| CN113340587A (en) * | 2021-06-22 | 2021-09-03 | 浙江科科检测科技有限公司 | Safety valve on-line detector |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1333896A1 (en) * | 1985-07-08 | 1987-08-30 | Предприятие П/Я В-8670 | Bed for testing hydraulic equipment |
| JP2001165812A (en) * | 1999-12-13 | 2001-06-22 | Hitachi Ltd | Safety valve test method and safety valve test apparatus |
| KR20090017215A (en) * | 2007-08-14 | 2009-02-18 | 주식회사 대흥이엔텍 | Safety valve testing apparatus |
| CN103512744A (en) * | 2013-10-11 | 2014-01-15 | 江南大学 | Safety protecting and hoisting device of safety valve calibration console |
| KR101358087B1 (en) * | 2013-03-26 | 2014-02-04 | 한국기계연구원 | Automatic precision test method and device for safety valve |
| CN105841940A (en) * | 2016-03-29 | 2016-08-10 | 中国计量学院 | Thermal expansion valve time constant testing device and testing method |
| KR101783563B1 (en) * | 2016-12-21 | 2017-10-10 | 이우영 | Safety Valve Test apparatus |
| CN211291987U (en) * | 2019-12-31 | 2020-08-18 | 深圳市特种设备安全检验研究院 | Safety valve testing device |
-
2019
- 2019-12-31 CN CN201911419032.4A patent/CN111076924B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1333896A1 (en) * | 1985-07-08 | 1987-08-30 | Предприятие П/Я В-8670 | Bed for testing hydraulic equipment |
| JP2001165812A (en) * | 1999-12-13 | 2001-06-22 | Hitachi Ltd | Safety valve test method and safety valve test apparatus |
| KR20090017215A (en) * | 2007-08-14 | 2009-02-18 | 주식회사 대흥이엔텍 | Safety valve testing apparatus |
| KR101358087B1 (en) * | 2013-03-26 | 2014-02-04 | 한국기계연구원 | Automatic precision test method and device for safety valve |
| CN103512744A (en) * | 2013-10-11 | 2014-01-15 | 江南大学 | Safety protecting and hoisting device of safety valve calibration console |
| CN105841940A (en) * | 2016-03-29 | 2016-08-10 | 中国计量学院 | Thermal expansion valve time constant testing device and testing method |
| KR101783563B1 (en) * | 2016-12-21 | 2017-10-10 | 이우영 | Safety Valve Test apparatus |
| CN211291987U (en) * | 2019-12-31 | 2020-08-18 | 深圳市特种设备安全检验研究院 | Safety valve testing device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610016A (en) * | 2020-06-23 | 2020-09-01 | 吴江市东吴机械有限责任公司 | Safety valve performance testing tool and method |
| CN113340587A (en) * | 2021-06-22 | 2021-09-03 | 浙江科科检测科技有限公司 | Safety valve on-line detector |
| CN113340587B (en) * | 2021-06-22 | 2023-12-05 | 浙江科科检测科技有限公司 | Safety valve on-line detector |
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