CN105352711A - Constant pressure valve and detection device and detection method thereof - Google Patents
Constant pressure valve and detection device and detection method thereof Download PDFInfo
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- CN105352711A CN105352711A CN201510731143.4A CN201510731143A CN105352711A CN 105352711 A CN105352711 A CN 105352711A CN 201510731143 A CN201510731143 A CN 201510731143A CN 105352711 A CN105352711 A CN 105352711A
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Abstract
The invention discloses a constant pressure valve and a detection device and a detection method thereof. The constant pressure valve comprises a valve body, a valve cover is installed on the valve body, and a valve head is installed inside the valve body. A slider is installed on the valve head. The upper end of the slider is sleeved with the valve cover. A first spring is installed between the top surface of the slider and the valve cover. A first sealing ring is installed between the side wall of the slider and the valve cover, and the first sealing ring is sleeved with a polytetrafluoroethylene ferrule. According to the constant pressure valve and the detection device and the detection method thereof of the invention, the constant-pressure valve has a simple structure, good sealing performance and high opening sensitivity; and by using the detection device and the detection method, the opening capacity, closing internal leakage and service life of the pressure valve can be detected simultaneously, the detection process is simple, and the detection accuracy is high.
Description
Technical field
The present invention relates to a kind of constant pressure valve and pick-up unit thereof and detection method.
Background technology
Because of need of production, air-cooled heat pump unit, the freezing unit (cryogenic system) that all will run throughout the year, handpiece Water Chilling Units (air-conditioning system), often can run into cold start-up situation because of reasons such as weather conditions.During cold start-up, because the condensing temperature of system is too low, after compressor start, the high-pressure side pressure of system does not increase, and compressor high and low pressure side can not set up enough height pressure reduction, and compressor can be caused to load; Compressor oil-supplying is not enough, compressor may because lubrication, cooling is not enough and badly damaged compressor.As system uses constant pressure valve, after compressor start, compressor can be made at short notice to set up rapidly enough height pressure reduction, and then it being smooth and easy to ensure that compressor displacement regulating loads, ensureing that compressor does not cause harmful effect because losing oil.Constant pressure valve, with non-return valve effect, when the compressor is shut down, can cut off rapidly compressor and be connected with gas exhaust piping, prevent gases at high pressure from passing back into compressor, effectively avoid compressor to reverse for a long time.
But current used constant pressure valve due to the sealing between valve head and valve body, slide block poor, along with pressure valve service time increase its easily there is the problems such as leakage.Constant pressure valve needs the valve opening ability of pressure valve and closes valve internal leakage and check respectively before dispatching from the factory, but current used checkout equipment its all can only singlely detect, and testing process is complicated, and Detection accuracy is low.
Summary of the invention
The object of the present invention is to provide a kind of constant pressure valve and pick-up unit thereof and detection method, constant pressure valve arrangement is simple, good airproof performance, and valve opening is sensitive; Its pick-up unit and detection method can simultaneously detected pressures valve valve opening ability and close valve internal leakage and durability test, and testing process is simple, and Detection accuracy is high.
In order to achieve the above object, technical scheme of the present invention is:
A kind of constant pressure valve, comprise valve body, described valve body is provided with valve gap, in described valve body, valve head is installed, described valve head is provided with slide block, outside described upper end of slide block, is socketed with valve gap, described slide block is provided with the first spring between end face and valve gap, first O-ring seal is installed between described slider side wall and valve gap, and is socketed with Teflon ferrules outside described first O-ring seal.
Described valve body is separately installed with the first valve body connector, the second valve body connector, described valve gap is provided with valve head connection; Described first valve body connector is provided with the first nut, between described first valve body connector and the first nut, the first sealing cap is installed; Described second valve body connector is provided with the second nut, between described second nut and the second valve body connector, the second bonnet is installed; Described valve head connection is provided with valve gap nut, between described valve gap nut and valve head connection, valve gap sealing cap is installed.
Described valve head bottom surface offers sealed groove, is provided with the second O-ring seal in described sealed groove, and described valve body is provided with projection, and described projection and the second O-ring seal linear contact lay.
Described projection comprises base, wedge angle jacking block, and described base is connected with wedge angle jacking block, the top of described wedge angle jacking block and the second O-ring seal linear contact lay; Described sealed groove is inverted trapezoidal sealed groove, and described inverted trapezoidal sealed groove is connected with the second O-ring seal screens.
On described slide block, end face offers spring groove, installs the first spring, be provided with pad in the spring groove below described first spring in described spring groove; Second spring is installed between described valve head and slide block.
Described valve head bottom surface offers arcuation groove.
Described valve body is connected with lower female connector by the first bolt, and is socketed with first method orchid outside described lower female connector; Described valve body is connected with female connector by the second bolt, is socketed with the second flange outside described female connector.
A kind of pick-up unit of constant pressure valve, comprise monitor station, described monitor station is separately installed with testing product fixing tool platform, guidance panel, described guidance panel is separately installed with master switch, low-pressure relief valve, high-pressure pressure-reducing valve, display screen, low pressure gauge, low pressure pilot lamp, blowout-back pressure gauge, HT pilot, spinner-type flowmeter.
Low-pressure gas source inlet port, high-pressure air source inlet port is separately installed with in described monitor station, wherein said low-pressure gas source inlet port is connected with the first tensimeter, described first tensimeter is connected with the first solenoid valve, described first solenoid valve is connected with first sensor, and described first sensor is connected with solenoid valve; Described high-pressure air source inlet port is connected with the second tensimeter, and described second tensimeter is connected with high-pressure solenoid valve, and described high-pressure solenoid valve is connected with high pressure sensor, and described high pressure sensor is connected with solenoid valve; Described solenoid valve is connected with the second sensor by after testing product fixing tool platform, and described second sensor is connected with the second solenoid valve, the 3rd solenoid valve respectively, and described second solenoid valve is connected with exhaust box, and described 3rd solenoid valve is connected with flowmeter.
A detection method for the pick-up unit of constant pressure valve, comprises the steps:
(1) constant pressure valve valve opening ability is tested
First low-pressure relief valve is opened and is adjusted to set pressure, then low pressure represents set pressure, then the first solenoid valve is opened, then gas enters air drum, and then air drum first sensor work display constant pressure pressure valve opening pressure scope, then tests constant pressure valve valve opening, then constant pressure valve outlet side second working sensor display pressure raises, then high-pressure solenoid valve is opened, and is finally vented, then workpiece valve opening ability is qualified; If low-pressure relief valve is opened be adjusted to set pressure, then low pressure gauge display setting pressure, then the first solenoid valve is opened, then gas enters air drum, and then air drum first sensor work display constant pressure pressure valve opening pressure scope, then tests constant pressure valve valve opening, then test constant pressure valve outlet side pressure second working sensor display pressure not raise, then warning horn sounds, then workpiece is defective, and cracking pressure is too high; If low-pressure relief valve is opened be adjusted to set pressure, then low pressure gauge display setting pressure, then the first solenoid valve is opened, then gas enters air drum, and then air drum first sensor work display pressure is lower than the minimum cracking pressure of constant pressure valve, then tests constant pressure valve valve opening, then constant pressure valve outlet side second working sensor display pressure raises, then warning horn sounds, then workpiece is defective, and cracking pressure is too low;
(2) test constant pressure valve and close valve internal leakage
First low-pressure relief valve is opened and is adjusted to set pressure, low pressure gauge display setting pressure, first solenoid valve is opened, gas enters air drum, air drum first sensor work display pressure setting pressure, test constant pressure valve valve opening, constant pressure valve outlet side second working sensor display pressure raises, high-pressure solenoid valve is opened, exhaust, second solenoid valve is opened and is let out gas storage cylinder pressure, air drum first sensor work display pressure is the minimum cracking pressure 90% of constant pressure valve, high-pressure solenoid valve is closed, second closed electromagnetic valve, test constant pressure valve closes valve, 3rd solenoid valve is opened, flowmeter is by spinner-type flowmeter work display flow value, internal leakage value is in range of set value, workpiece is qualified, if low-pressure relief valve is opened be adjusted to set pressure, low pressure gauge display setting pressure, first solenoid valve is opened, gas enters air drum, air drum first sensor work display pressure setting pressure, test constant pressure valve valve opening, constant pressure valve outlet side second working sensor display pressure raises, high-pressure solenoid valve is opened, exhaust, second solenoid valve is opened and is let out gas storage cylinder pressure, air drum first sensor work display pressure is the minimum cracking pressure 90% of constant pressure valve, high-pressure solenoid valve is closed, second closed electromagnetic valve, test constant pressure valve closes valve, 3rd solenoid valve is opened, flowmeter is by spinner-type flowmeter work display flow value, internal leakage value exceeds in range of set value, warning horn sounds, workpiece internal leakage exceeds standard defective,
(3) constant pressure valve durability test is tested
First the make-and-break time of the pressure test gas setting constant pressure valve maximum opening pressure 1.1 times in constant pressure valve and break-make number of times, then detect according to the make-and-break time of setting and break-make number of times in constant pressure valve, defective then alarm, qualified, continue test until the break-make number of times of setting has all been surveyed.
The invention has the beneficial effects as follows: a kind of constant pressure valve and pick-up unit thereof and detection method, constant pressure valve arrangement is simple, good airproof performance, and valve opening is sensitive; Its pick-up unit and detection method can simultaneously detected pressures valve valve opening ability and close valve internal leakage and durability test, and testing process is simple, and Detection accuracy is high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the partial enlarged drawing of B in Fig. 1;
Fig. 3 is the partial enlarged drawing of A in Fig. 1;
Fig. 4 is the external structure schematic diagram of pick-up unit;
Fig. 5 is the inside schematic diagram of pick-up unit.
Embodiment
Embodiment 1
A kind of constant pressure valve as shown in Figure 1, Figure 2, Figure 3 shows, comprise valve body 1, described valve body 1 is provided with valve gap 2, in described valve body 1, valve head 3 is installed, described valve head 3 is provided with slide block 4, is socketed with valve gap 2 outside described slide block 4 upper end, described slide block 4 is provided with the first spring 5 between end face and valve gap 2, first O-ring seal 6 is installed between described slide block 4 sidewall and valve gap 2, and is socketed with Teflon ferrules 7 outside described first O-ring seal 6.First O-ring seal 6 outer socket Teflon ferrules 7, can not only improve the sealing of slide block 4 sidewall and valve gap 2, and can reduce the wearing and tearing of the first O-ring seal 6, thus effectively improve the serviceable life of pressure valve.
Described valve body 1 is separately installed with the first valve body connector 8, second valve body connector 9, described valve gap 2 is provided with valve head connection 10; Described first valve body connector 8 is provided with the first nut 16, between described first valve body connector 8 and the first nut 16, first sealing cap 17 is installed; Described second valve body connector 9 is provided with the second nut 18, between described second nut 18 and the second valve body connector 9, second bonnet 19 is installed; Described valve head connection 10 is provided with valve gap nut 20, between described valve gap nut 20 and valve head connection 10, valve gap sealing cap 21 is installed.
Described valve head 3 bottom surface offers sealed groove 11, is provided with the second O-ring seal 12 in described sealed groove 11, and described valve body 1 is provided with projection 13, and described projection 13 and the second O-ring seal 12 linear contact lay.The valve head 3 used at present contacts with all adopting face between valve body 1, and it is low that face contact exists sealing, along with the increase of service time is easily revealed.Projection 13 and the second O-ring seal 12 linear contact lay effectively can improve the sealing between valve head 3 and valve body 1, thus improve serviceable life.
Described projection 13 comprises base 14, wedge angle jacking block 15, and described base 14 is connected with wedge angle jacking block 15, the top of described wedge angle jacking block 15 and the second O-ring seal 12 linear contact lay; Described sealed groove 11 is inverted trapezoidal sealed groove, and described inverted trapezoidal sealed groove is connected with the second O-ring seal 12 screens.Inverted trapezoidal sealed groove is connected with the second O-ring seal 12 screens, not only easy for installation, good sealing effect, and inverted trapezoidal sealed groove is set to the second O-ring seal 12 and expands with heat and contract with cold and leave space.
On described slide block 4, end face offers spring groove 22, installs the first spring 5, be provided with pad 23 in the spring groove 22 below described first spring 5 in described spring groove 22; Second spring 25 is installed between described valve head 3 and slide block 4.
Described valve head 3 bottom surface offers arcuation groove 24.The setting of arcuation groove 24 makes valve head 3 lifting surface area increase, thus effectively improves the valve opening sensitivity of pressure valve.
Described valve body 1 is connected with lower female connector 27 by the first bolt 26, and is socketed with first method orchid 28 outside described lower female connector 27; Described valve body 1 is connected with female connector 30 by the second bolt 29, is socketed with the second flange 31 outside described female connector 30.
The pick-up unit of a kind of constant pressure valve as shown in Figure 4, comprise monitor station 40, described monitor station 40 is separately installed with testing product fixing tool platform 41, guidance panel 41, described guidance panel 41 is separately installed with master switch 42, low-pressure relief valve 48, high-pressure pressure-reducing valve 49, display screen 39, low pressure gauge 43, low pressure pilot lamp 44, blowout-back pressure gauge 45, HT pilot 46, spinner-type flowmeter 47.
As shown in Figure 5, low-pressure gas source inlet port 50, high-pressure air source inlet port 51 is separately installed with in described monitor station 40, wherein said low-pressure gas source inlet port 50 is connected with the first tensimeter 52, described first tensimeter 52 is connected with the first solenoid valve 53, described first solenoid valve 53 is connected with first sensor 54, and described first sensor 54 is connected with solenoid valve 55; Described high-pressure air source inlet port 51 is connected with the second tensimeter 56, and described second tensimeter 56 is connected with high-pressure solenoid valve 57, and described high-pressure solenoid valve 57 is connected with high pressure sensor 58, and described high pressure sensor 58 is connected with solenoid valve 55; Described solenoid valve 55 is connected with the second sensor 59 by after testing product fixing tool platform 41, described second sensor 59 is connected with the second solenoid valve 60, the 3rd solenoid valve 61 respectively, described second solenoid valve 60 is connected with exhaust box 62, and described 3rd solenoid valve 61 is connected with flowmeter 63.
A detection method for the pick-up unit of constant pressure valve, comprises the steps:
(1) constant pressure valve valve opening ability is tested
First low-pressure relief valve 48 is opened and is adjusted to 0.36MPa, then low pressure gauge 43 shows 0.36MPa, then the first solenoid valve 53 is opened, then gas enters air drum, and then air drum first sensor 54 works and shows pressure 0.36MPa, then tests constant pressure valve valve opening, then constant pressure valve outlet side second sensor 59 work display pressure raises, then high-pressure solenoid valve 57 is opened, and is finally vented, then workpiece valve opening ability is qualified; If low-pressure relief valve 48 is opened be adjusted to 0.36MPa, then low pressure gauge 43 shows 0.36MPa, then the first solenoid valve 53 is opened, then gas enters air drum, and then air drum first sensor 54 works and shows pressure 0.36MPa, then tests constant pressure valve valve opening, then test constant pressure valve outlet side pressure second sensor 59 work display pressure not raise, then warning horn sounds, then workpiece is defective, and cracking pressure is too high; If low-pressure relief valve 48 is opened be adjusted to 0.36MPa, then low pressure gauge 43 shows 0.36MPa, then the first solenoid valve 53 is opened, then gas enters air drum, and then air drum first sensor 54 works and shows pressure 0.2MPa, then tests constant pressure valve valve opening, then constant pressure valve outlet side second sensor 59 work display pressure raises, then warning horn sounds, then workpiece is defective, and cracking pressure is too low;
(2) test constant pressure valve and close valve internal leakage
First low-pressure relief valve opens modulation 0.36MPa, low pressure gauge display 0.36MPa, first solenoid valve is opened, gas enters air drum, air drum first sensor work display pressure 0.36MPa, test constant pressure valve valve opening, constant pressure valve outlet side second working sensor display pressure raises, high-pressure solenoid valve is opened, exhaust, second solenoid valve is opened and is let out gas storage cylinder pressure, air drum first sensor work display pressure 0.30MPa, high-pressure solenoid valve is closed, second closed electromagnetic valve, test constant pressure valve closes valve, 3rd solenoid valve is opened, flowmeter is by spinner-type flowmeter work display flow value, internal leakage value is in range of set value, workpiece is qualified, if low-pressure relief valve opens modulation 0.36MPa, low pressure gauge display 0.36MPa, first solenoid valve is opened, gas enters air drum, air drum first sensor work display pressure 0.36MPa, test constant pressure valve valve opening, constant pressure valve outlet side second working sensor display pressure raises, high-pressure solenoid valve is opened, exhaust, second solenoid valve is opened and is let out gas storage cylinder pressure, air drum first sensor work display pressure 0.30MPa, high-pressure solenoid valve is closed, second closed electromagnetic valve, test constant pressure valve closes valve, 3rd solenoid valve is opened, flowmeter is by spinner-type flowmeter work display flow value, internal leakage value exceeds in range of set value, warning horn sounds, workpiece internal leakage exceeds standard defective.
(3) constant pressure valve durability test is tested
First make-and-break time in constant pressure valve of 0.43MPa test gas and break-make number of times is set, then detect according to the make-and-break time of setting and break-make number of times in constant pressure valve, defective then alarm, qualified, continue test until the break-make number of times of setting has all been surveyed.
A kind of constant pressure valve of the present embodiment and pick-up unit thereof and detection method, constant pressure valve arrangement is simple, good airproof performance, and valve opening is sensitive; Its pick-up unit and detection method can simultaneously detected pressures valve valve opening ability and close valve internal leakage and durability test, and testing process is simple, and Detection accuracy is high.
Claims (10)
1. a constant pressure valve, it is characterized in that: comprise valve body (1), described valve body (1) is provided with valve gap (2), valve head (3) is installed in described valve body (1), described valve head (3) is provided with slide block (4), valve gap (2) is socketed with outside described slide block (4) upper end, described slide block (4) is upper is provided with the first spring (5) between end face and valve gap (2), first O-ring seal (6) is installed between described slide block (4) sidewall and valve gap (2), and is socketed with Teflon ferrules (7) outside described first O-ring seal (6).
2. a kind of constant pressure valve according to claim 1, is characterized in that: described valve body (1) is separately installed with the first valve body connector (8), the second valve body connector (9), described valve gap (2) is provided with valve head connection (10); Described first valve body connector (8) is provided with the first nut (16), between described first valve body connector (8) and the first nut (16), the first sealing cap (17) is installed; Described second valve body connector (9) is provided with the second nut (18), between described second nut (18) and the second valve body connector (9), the second bonnet (19) is installed; Described valve head connection (10) is provided with valve gap nut (20), between described valve gap nut (20) and valve head connection (10), valve gap sealing cap (21) is installed.
3. a kind of constant pressure valve according to claim 1, it is characterized in that: described valve head (3) bottom surface offers sealed groove (11), second O-ring seal (12) is installed in described sealed groove (11), described valve body (1) is provided with projection (13), and described projection (13) and the second O-ring seal (12) linear contact lay.
4. a kind of constant pressure valve according to claim 3, it is characterized in that: described projection (13) comprises base (14), wedge angle jacking block (15), described base (14) is connected with wedge angle jacking block (15), the top of described wedge angle jacking block (15) and the second O-ring seal (12) linear contact lay; Described sealed groove (11) is inverted trapezoidal sealed groove, and described inverted trapezoidal sealed groove is connected with the second O-ring seal (12) screens.
5. a kind of constant pressure valve according to claim 1, it is characterized in that: the upper end face of described slide block (4) offers spring groove (22), in described spring groove (22), the first spring (5) is installed, in the spring groove (22) of described first spring (5) below, pad (23) is installed; Second spring (25) is installed between described valve head (3) and slide block (4).
6. a kind of constant pressure valve according to claim 1, is characterized in that: described valve head (3) bottom surface offers arcuation groove (24).
7. a kind of constant pressure valve according to claim 1, is characterized in that: described valve body (1) is connected with lower female connector (27) by the first bolt (26), and is socketed with first method orchid (28) outside described lower female connector (27); Described valve body (1) is connected with female connector (30) by the second bolt (29), is socketed with the second flange (31) outside described female connector (30).
8. the pick-up unit of a kind of constant pressure valve according to claim 1, it is characterized in that: comprise monitor station (40), described monitor station (40) is separately installed with testing product fixing tool platform (41), guidance panel (41), described guidance panel (41) is separately installed with master switch (42), low-pressure relief valve (48), high-pressure pressure-reducing valve (49), display screen (39), low pressure gauge (43), low pressure pilot lamp (44), blowout-back pressure gauge (45), HT pilot (46), spinner-type flowmeter (47).
9. the pick-up unit of a kind of constant pressure valve according to claim 8, it is characterized in that: in described monitor station (40), be separately installed with low-pressure gas source inlet port (50), high-pressure air source inlet port (51), wherein said low-pressure gas source inlet port (50) is connected with the first tensimeter (52), described first tensimeter (52) is connected with the first solenoid valve (53), described first solenoid valve (53) is connected with first sensor (54), and described first sensor (54) is connected with solenoid valve (55); Described high-pressure air source inlet port (51) is connected with the second tensimeter (56), described second tensimeter (56) is connected with high-pressure solenoid valve (57), described high-pressure solenoid valve (57) is connected with high pressure sensor (58), and described high pressure sensor (58) is connected with solenoid valve (55); Described solenoid valve (55) is connected with the second sensor (59) afterwards by testing product fixing tool platform (41), described second sensor (59) is connected with the second solenoid valve (60), the 3rd solenoid valve (61) respectively, described second solenoid valve (60) is connected with exhaust box (62), and described 3rd solenoid valve (61) is connected with flowmeter (63).
10. the detection method of the pick-up unit of a kind of constant pressure valve according to claim 8, is characterized in that comprising the steps:
(1) constant pressure valve valve opening ability is tested
First low-pressure relief valve (48) is opened and is adjusted to set pressure, then low pressure gauge (43) shows set pressure, then the first solenoid valve (53) is opened, then gas enters air drum, then air drum first sensor (54) work display constant pressure pressure valve opening pressure scope, then constant pressure valve valve opening is tested, then constant pressure valve outlet side second sensor (59) work display pressure raises, then high-pressure solenoid valve (57) is opened, finally be vented, then workpiece valve opening ability is qualified; If low-pressure relief valve (48) is opened be adjusted to set pressure, then low pressure gauge (43) display setting pressure, then the first solenoid valve (53) is opened, then gas enters air drum, then air drum first sensor (54) work display constant pressure pressure valve opening pressure scope, then constant pressure valve valve opening is tested, then test constant pressure valve outlet side pressure second sensor (59) work display pressure not raise, then warning horn sounds, then workpiece is defective, and cracking pressure is too high; If low-pressure relief valve (48) is opened be adjusted to set pressure, then low pressure gauge (43) display setting pressure, then the first solenoid valve (53) is opened, then gas enters air drum, and then air drum first sensor (54) work display pressure is lower than the minimum cracking pressure of constant pressure valve, then tests constant pressure valve valve opening, then constant pressure valve outlet side second sensor (59) work display pressure raises, then warning horn sounds, then workpiece is defective, and cracking pressure is too low;
(2) test constant pressure valve and close valve internal leakage
First low-pressure relief valve (48) is opened and is adjusted to set pressure, low pressure gauge (43) display setting pressure, first solenoid valve (53) is opened, gas enters air drum, air drum first sensor (54) work display pressure setting pressure, test constant pressure valve valve opening, constant pressure valve outlet side second sensor (59) work display pressure raises, high-pressure solenoid valve (57) is opened, exhaust, second solenoid valve (60) is opened and is let out gas storage cylinder pressure, air drum first sensor (54) work display pressure is the minimum cracking pressure 90% of constant pressure valve, high-pressure solenoid valve (57) is closed, second solenoid valve (60) cuts out, test constant pressure valve closes valve, 3rd solenoid valve (61) is opened, flowmeter (63) is by spinner-type flowmeter (47) work display flow value, internal leakage value is in range of set value, workpiece is qualified, if low-pressure relief valve (48) is opened be adjusted to set pressure, low pressure gauge (43) display setting pressure, first solenoid valve (53) is opened, gas enters air drum, air drum first sensor (54) work display pressure setting pressure, test constant pressure valve valve opening, constant pressure valve outlet side second sensor (59) work display pressure raises, high-pressure solenoid valve (57) is opened, exhaust, second solenoid valve (60) is opened and is let out gas storage cylinder pressure, air drum first sensor (54) work display pressure is the minimum cracking pressure 90% of constant pressure valve, high-pressure solenoid valve (57) is closed, second solenoid valve (60) cuts out, test constant pressure valve closes valve, 3rd solenoid valve (61) is opened, flowmeter (63) is by spinner-type flowmeter (47) work display flow value, internal leakage value exceeds in range of set value, warning horn sounds, workpiece internal leakage exceeds standard defective,
(3) constant pressure valve durability test is tested
First the make-and-break time of the pressure test gas setting constant pressure valve maximum opening pressure 1.1 times in constant pressure valve and break-make number of times, then detect according to the make-and-break time of setting and break-make number of times in constant pressure valve, defective then alarm, qualified, continue test until the break-make number of times of setting has all been surveyed.
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| CN108413044A (en) * | 2018-02-05 | 2018-08-17 | 北汽福田汽车股份有限公司 | Pressure valve and pumping pressure detecting system |
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Address after: 312500 habayashi Zhejiang city of Shaoxing province Xinchang County Road No. 18 Applicant after: Zhejiang Yongda Refrigeration Machinery Co Ltd Address before: 312500 Zhejiang city of Shaoxing province Xinchang County habayashi Street East New District Yu Linfan Applicant before: Xinchang Liyongda Refrigeration Machinery Co., Ltd. |
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