GB/T 10844-1989 General technical requirements for marine electro-hydraulic servo valves
Some standard content:
UDC 629,12.051
National Standard of the People's Republic of China
GB10844-89
General Specification of Electro-Hydraulic Servo Valves for Marine Use
shlp
1889-03-31 issued
National Technical Supervision Week issued
1890-01-01 implemented
Subject content and applicable examples
Cited standards.
Terms, symbols and units
Technical requirements
General requirements for tests
Electrical test
Static test
Dynamic test
Duration test
Marine environmental condition test
Degradation pressure test
Expression of test results
Inspection regulations
Marking, packaging, transportation and storage
..-{25)
National Standard of the People's Republic of China
General technical conditions for marine electro-hydraulic servovalves
German standard This standard adopts 1S06404-1985 (pressure transmission - example service - test method). 1 Subject content and scope of application
GE1084489
This standard adds technical specifications, application requirements, test methods and inspection rules for flow control valves for ships. This standard is applicable to all types of electric and offshore installations with oil as the medium. Other types of services, such as pressure control valves and valves with inter-stage electrical feedback, can also refer to this standard. 2 Reference standards
GB786 Hydraulic and pneumatic graphic symbols
GB2423.16 Basic environmental test procedures for electrical and electronic products Test method: GJR4.7 Environmental test for electronic equipment, GJB4.8 Environmental test for electronic equipment, GIB 4.8 Shock test for equipment environment test S Terms, symbols and single
8.1 Terms
3.1.1 Electro-hydraulic servo valve Eletro-hydraulic servo valve A servo valve that is mainly used to control the output flow. 3.t.2 Flow control electro-hydraulic servo valve Eletro-hydraulic servo valve A servo valve that is mainly used to control the output flow. 1.3 Stage
The pressure amplifier in the servo valve can be single-stage, double-stage or single-stage. 3.1.4 Pressure gain pressur = galn
The rate of change of the load positive drop to the test current when the control flow gain is zero (see Figure 1). China's Industrial Corporation 19#-0-2 batch
1990-01-01 implementation
a.1.5 null
power curve
GB1084489
·Figure 1 pressure characteristics
negative pressure drop is the geometric position of the output stage where the control current is zero. 3.t.6 null.region
the area near the null position where the gain is affected by parameters such as speed and internal temperature. 3.1.7 ratio
superhuman current
the minimum increase in the output current required to change the output current of the load, expressed as a percentage of the rated current. s.laForward resolutiontesolution
The minimum increase in input current required to change the output in the direction of the input current change, expressed as a percentage of the rated current.
a.1.9Reverse resolutionthreshold
The minimum increase in input current required to change the output in the direction of the input current change, expressed as a percentage of the rated current.
Resolution is usually measured by reverse resolution. 3.1.10mol1bias
The change in zero bias caused by changes in working conditions such as pressure and filtration, expressed as a percentage of the rated current. a.1.11 Internal leak age When the control flow is vertical, the flow rate from the inlet back to the outlet will change with the change of the air inlet pressure and the input current (Figure 2)
3.1.12 Control flow The curve in Figure 2 of GB 10144-89 is the flow rate outflowing from the control oil 11 (A or B) of the valve (see Figure 3). The control flow when the negative pressure drop is zero is called the no-load flow; the control flow when the negative pressure drop is not required is called the load flow. Figure 3 Control flow curve. 1.3 NoJoadflowcrve—Control flow rate The line of a complete cycle of the air control flow rate with the input current. 3.1.14 Nominal flow rate normaltilowcurv The midpoint of the flow rate curve. 8.1.15 Flow gain flowgain The flow rate of the typical practice (see Figure 4).
GH10844-88
Meanwhile, the nominal current gain line is drawn from the zero point of the nominal current curve to the two poles, and the slope is the nominal current gain line. 3.1.17 Linearity
The linearity of the nominal current curve. The nominal current gain line is measured by the deviation of the nominal current curve from the nominal current gain line, and is expressed as a percentage of the rated current (see Figure 4).
3.1.18 Symmetrysym 3.1.19 hysteresis
The maximum value of the input current for the same output at a constant frequency current, expressed as a percentage of the rated current, is the hysteresis when the nominal throttle gain of the two polarities is consistent. It is expressed as the percentage of the difference between the two to the larger one (see Figure 4). 1.1.20 overlap
The relative relationship between the axial position of the fixed throttle shuttle edge and the movable throttle electrode edge when the slider is in the raised position. 3.1.20.1 zero overlap
The distance between the zero flow point of the extension line of the nominal current curve of the diode (see Figure 5). 1.1.20.2 overlap
overlap
GB 10E4—89
Plasticity
Please note
Huan must charge curve
In the zero region, the net causes the nominal flow curve slope to decrease the cover (no Figure 5b) Control quality
Huan people's electricity beauty
uncovered lap
8.1.20.9 Negative cover
Nominal quantity
In the zero region, the net causes the nominal flow curve slope to increase the cover (see Figure 5c), *
Marriage hall
Blood test insurance
GB10844-.19
frequency response
*.1.21 transient response
The ratio of the control flow rate to the input current when the constant amplitude sinusoidal input signal changes within the specified frequency range. a.1.22 value ratio amphitudesaHa
The ratio of the control flow rate to the amplitude of the sinusoidal input current within a certain frequency range, s.1.z3 phase phase[ag
The instantaneous time difference between the sinusoidal output and the sinusoidal input current within the specified frequency range.
transient response
transientresponse
The output voltage when the input voltage is constant. 8.2 Special symbols and units
The symbols and units used in this standard are listed in Table 1. Table 1 Special code and unit
Line impedance
Practical diagram
Line diagram Power grid
Impedance
Dynamic report
Input electrical appliance
Rated current
Controlled flow
Flow gain
Negative maximum pressure drop
Oil supply pressure
Nominal pressure
PL= P,- Ps
Pa= P,+ P- P.- \.
L/ (le-mA)
Network description
Light pressure ratio
Combination pressure drop
Pressure is the gain
Distribution rate
Transmission institute
Technical requirements
GB 1pa44ag
P, . P,- P,- PL
MPn/mA
4.T Mechanical Part
4.1.1 The installation hole and the size of the oil port of the valve shall be determined according to Figure 6 and Table 2. The code of the oil port shall be clearly marked on the outside of the valve. Inlet
Oil return port
Control port
Community, the most important position.
2 is the actual installation scale.
GB10844-89
The size of the installation hole and the injection port shall be in accordance with the size of the installation hole and the injection port
1.1.2 All the connecting parts shall be firmly locked and the product shall be sealed with lead. 1.1. The materials, finished parts, components and parts of the daily dry products shall be strictly inspected and have a certificate of conformity. Internal parts of this part are not used for any notice:
4.1.1 Appearance, the product surface should not have any bruises, burrs, patterns, rust or other defects. 4.2 Electrical parts
4. 2.1, the connection force or the socket pin number, the color of the external lead and the polarity of the input current shall be in accordance with Table 3, Table 3
, the quality of the pin number
, the external lead wire
, the positive pole of the control current
, the bulb, the connection, the separation, the blue
, the short, the medical
, the gland. Or, milk, blue
, green, surface, cool
When:
1 to 21 to. 3
When! inch,
2 to 1:3 to:
4.2.zThe resistance at 20℃ is the nominal value of the wire. The wire resistance tolerance is ±10% of the nominal resistance value. The resistance of the wires matched in the same valve is not more than 5% of the nominal resistance limit. 4.2.3 The resistance between the coil and the wire should not be less than 50M0 under standard test conditions. At temperature, GB10444-88, the safety test store needs to be heated. During the high temperature test, it should not be less than 6MS. 4.2.4 The dielectric strength of the servo motor refers to the wire between the wire and the wire. At a frequency of 5Hz, the AC voltage specified in Table 4 should not be broken down for 1min. The service life will be tested up to 4 times. Table 4
Electric motor,
.2.5 Push-on overload current is two times of rated current. Connecting test
(under power supply condition)
After life test
1.3 Calibration pressure
4.3.1 Generally, a filter with a nominal pressure of no less than 10m should be installed before the oil inlet of the servo motor. The pollution level of the working oil should not exceed the limit of Table 5.
Blood pump, mL
Effective scale, μm
5 ~ [5
:5- 2h
25 ~ 50
4.3.2 Servo motor shall not have obvious external leakage under various use conditions and within the working period (it is allowed that there is no dripping wetness before). .3.3 Overpressure durability is to apply 1.5 times the nominal pressure to the oil inlet "P" of the service and the two control ports "A" and "B" respectively, and keep it for 2.5 minutes. After the test, the integrity of the disk, hysteresis ring and deviation shall be checked, etc., and the requirements of 4.4.2, 4.4.5 and 4.4.9 shall be met. 4.3.4 Overpressure durability is to apply 2.5 times the nominal pressure to the oil inlet P and control port A, and 1.5 times the nominal pressure to the lower oil port *, and keep it for 30 seconds respectively. The service should not be damaged, but the working performance is not required to be restored. The light damage pressure will be shown in the figure below, and the product can be used for other purposes.
4.3.5 Force pulse is the life test of the service under severe working conditions. The requirements and performance tolerances shall be specified in the special technical parts 4. Products that have undergone pressure pulse testing are generally not used. When the positive current is input into the Anet, the liquid flows from the control port "A" and flows into the oil "1" from the control port "B", which is determined as the positive flow rate. 4.4.1 The tolerance of the rated flow is =10%, and the linearity is not greater than 5%. The resistance is not greater than 1D megawatt. 4.4.5 The ring is not greater than 5%. 4.4.6 The decomposition rate is not greater than 1%. 4.7 The pressure gain should be within 40% of the maximum negative The load voltage drop is expressed as the half slope of the load voltage drop to the input current. --When the input current changes by 1%, the negative voltage drop should exceed 30% of the load voltage drop. 4.4.8 The power deviation is +2.5%~.2.5%. 4.4.9 The zero deviation is measured under standard conditions and is not greater than 25% during the acceptance test, and is not greater than 6% during the service life. ±.4.1D The supply pressure is within the range of 80%~110% of the nominal pressure, and the zero source is not less than 2%. 9
GB10844—8 9
4.4.11 The stopping force is within the range of 0.7MP~0.7MP, and the zero drift is not greater than 2. 4.4.12 The temperature zero leakage is when the working fluid temperature changes to 56, and the zero drift is greater than 14%.
4.5 Dynamic characteristics
4.5. The frequency characteristics should be measured under the standard test conditions. The actual input current is measured at the fixed current. Usually the logarithmic characteristic length system ( See Figure 7), the amplitude ratio is measured by the notch bandwidth and the relative bandwidth. The amplitude ratio is
,
24222224442444
Figure 7 shows the half-frequency continuous
20u300
frequency market, H
4.5.1.1 Amplitude bandwidth
When the sinusoidal input current is kept constant, the control method measures the amplitude of the control wind at a low frequency, and the rate corresponding to the decrease of 3dB with the increase of frequency is the amplitude ratio. 4. 5. 1,2 Phase frequency setting
The frequency corresponding to the sinusoidal input current when it is 90 (or 15\) behind the current is the phase frequency bandwidth. 4.6 Ring spot conditions
4.6.1 Temperature density
4.6.1,1 The servo motor should be able to operate within the range of -30-60℃ ambient temperature and 1-30~-90℃ net liquid temperature change pressure. Special requirements are specified in the special control technical conditions
4.6.1.3 Heart When the ambient temperature and working fluid humidity are 3D, the valve should be able to operate at ±50% of the rated voltage. During the test, check the external sealing performance, which should meet the requirements of 4.3.2. 6.1.3 In the working fluid range of 30℃ to 90℃, the performance of the valve should be guaranteed. During the high temperature and cut-off temperature tests, only the rated flow disc (tolerance +23%), zinc content (2%) or belt ring (6℃) are tested. The insulation resistance at high temperature is the bottom strength and the local tightness.The materials, finished parts, components and parts of daily-use dry products have all been strictly inspected and have certificates of conformity. Internal parts of this product are not used for any forging layer:
4.1.1 Appearance, the product surface should not have any bruises, burrs, decoration lines, rust or other defects. 4.2 Electrical parts
4. 2.1, the connection force or the socket pin number, the color of the external lead wire and the polarity of the input current shall be in accordance with Table 3 and Table 3.
The quality of the pin number
The external lead wire
The positive pole of the control current
The ball, the collector, the blue
The short circuit, the medical
The gland. Or, milk, blue
green,, surface, cool
When:,
1 to 21 to. 3bzxZ.net
When! Inch,
2 to 1:3 to:
4.2.z20℃ resistance is the nominal value of the wire. The wire resistance tolerance is 10% of the nominal resistance value. The wire resistance value of the paired wires in the same valve is not more than 5% of the nominal resistance limit. 4.2.3 The resistance between the coil and the wire body shall not be less than 50M0 under standard test conditions. At temperature, the safety test store shall be heated, and the high temperature test shall not be less than 6MS. 4.2.4 Servo dielectric strength refers to the line between the wires and the brush body. At a frequency of 5Hz, the AC voltage specified in Table 4 should not be broken down for 1min. The service life shall be tested at most 4 times. Table 4
motor,
.2.5 Push-on overload current is twice the rated current. Joint potential test (power supply under normal conditions)
After the life test
1.3 Calibration voltage
4.3.1 Generally, a filter with a length of no less than 10m is required before the oil inlet of the servo. The pollution level of the working oil shall not exceed the limit specified in Table 5.
Blood pump, mL
Effective gauge, μm
5 ~ [5
:5- 2h
25 ~ 50
4.3.2 Servo oil shall not have obvious external leakage under various conditions of use and during the working period (wetness that does not form drops is allowed to exist). .3.3 Overpressure tightness is to be subjected to 1.5 times the nominal pressure at the oil inlet "P" of the servo and the two control ports "A" and "B", and each is subjected to a positive force of 1.5 times the nominal pressure, and each is maintained for 2.5 minutes. After the test, the completeness of the dish, hysteresis ring and deviation must be checked, etc., as required by 4.4.2, 4.4.5 and 4.4.9. 4.3.4 The pressure is 2.5 times the nominal pressure applied to the oil inlet P and control port A, and 1.5 times the nominal pressure applied to the lower oil port *, each for 30 seconds, and the product should not be damaged, but the working performance is not required. After the light damage pressure is measured, the product can be used for other purposes.
4.3.5 The pressure pulse is a life test under severe working conditions. The requirements and performance tolerances should be specified in the special technical specifications. Products that have undergone pressure pulse testing are generally not used as products. When the positive current is input, the liquid flows from the control port "A" and flows into the oil "1" from the control port "B", which is determined as the positive flow rate. 4.4.1 The tolerance of the rated flow rate is =10%, and the linearity is not greater than 5%. The resistance is not greater than 1D megawatt.
4.4.5 The ring is not greater than 5%.
4.4.6 The decomposition rate is not greater than 1%.
t.4.7 The pressure gain should be within 40% of the maximum negative The load voltage drop is expressed as the half slope of the load voltage drop to the input current. --When the input current changes by 1%, the negative voltage drop should exceed 30% of the load voltage drop. 4.4.8 The power deviation is +2.5%~.2.5%. 4.4.9 The zero deviation is measured under standard conditions and is not greater than 25% during the acceptance test, and is not greater than 6% during the service life. ±.4.1D The supply pressure is within the range of 80%~110% of the nominal pressure, and the zero source is not less than 2%. 9
GB10844—8 9
4.4.11 The stopping force is within the range of 0.7MP~0.7MP, and the zero drift is not greater than 2. 4.4.12 The temperature zero leakage is when the working fluid temperature changes to 56, and the zero drift is greater than 14%.
4.5 Dynamic characteristics
4.5. The frequency characteristics should be measured under the standard test conditions. The actual input current is measured at the fixed current. Usually the logarithmic characteristic length system ( See Figure 7), the amplitude ratio is measured by the notch bandwidth and the relative bandwidth. The amplitude ratio is
,
24222224442444
Figure 7 shows the half-frequency continuous
20u300
frequency market, H
4.5.1.1 Amplitude bandwidth
When the sinusoidal input current is kept constant, the control method measures the amplitude of the control wind at a low frequency, and the rate corresponding to the decrease of 3dB with the increase of frequency is the amplitude ratio. 4. 5. 1,2 Phase frequency setting
The frequency corresponding to the sinusoidal input current when it is 90 (or 15\) behind the current is the phase frequency bandwidth. 4.6 Ring spot conditions
4.6.1 Temperature density
4.6.1,1 The servo motor should be able to operate within the range of -30-60℃ ambient temperature and 1-30~-90℃ net liquid temperature change pressure. Special requirements are specified in the special control technical conditions
4.6.1.3 Heart When the ambient temperature and working fluid humidity are 3D, the valve should be able to operate at ±50% of the rated voltage. During the test, check the external sealing performance, which should meet the requirements of 4.3.2. 6.1.3 In the working fluid range of 30℃ to 90℃, the performance of the valve should be guaranteed. During the high temperature and cut-off temperature tests, only the rated flow disc (tolerance +23%), zinc content (2%) or belt ring (6℃) are tested. The insulation resistance at high temperature is the bottom strength and the local tightness.The materials, finished parts, components and parts of daily-use dry products have all been strictly inspected and have certificates of conformity. Internal parts of this product are not used for any forging layer:
4.1.1 Appearance, the product surface should not have any bruises, burrs, decoration lines, rust or other defects. 4.2 Electrical parts
4. 2.1, the connection force or the socket pin number, the color of the external lead wire and the polarity of the input current shall be in accordance with Table 3 and Table 3.
The quality of the pin number
The external lead wire
The positive pole of the control current
The ball, the collector, the blue
The short circuit, the medical
The gland. Or, milk, blue
green,, surface, cool
When:,
1 to 21 to. 3
When! Inch,
2 to 1:3 to:
4.2.z20℃ resistance is the nominal value of the wire. The wire resistance tolerance is 10% of the nominal resistance value. The wire resistance value of the paired wires in the same valve is not more than 5% of the nominal resistance limit. 4.2.3 The resistance between the coil and the wire body shall not be less than 50M0 under standard test conditions. At temperature, the safety test store shall be heated, and the high temperature test shall not be less than 6MS. 4.2.4 Servo dielectric strength refers to the line between the wires and the brush body. At a frequency of 5Hz, the AC voltage specified in Table 4 should not be broken down for 1min. The service life shall be tested at most 4 times. Table 4
motor,
.2.5 Push-on overload current is twice the rated current. Joint potential test (power supply under normal conditions)
After the life test
1.3 Calibration voltage
4.3.1 Generally, a filter with a length of no less than 10m is required before the oil inlet of the servo. The pollution level of the working oil shall not exceed the limit specified in Table 5.
Blood pump, mL
Effective gauge, μm
5 ~ [5
:5- 2h
25 ~ 50
4.3.2 Servo oil shall not have obvious external leakage under various conditions of use and during the working period (wetness that does not form drops is allowed to exist). .3.3 Overpressure tightness is to be subjected to 1.5 times the nominal pressure at the oil inlet "P" of the servo and the two control ports "A" and "B", and each is subjected to a positive force of 1.5 times the nominal pressure, and each is maintained for 2.5 minutes. After the test, the completeness of the dish, hysteresis ring and deviation must be checked, etc., as required by 4.4.2, 4.4.5 and 4.4.9. 4.3.4 The pressure is 2.5 times the nominal pressure applied to the oil inlet P and control port A, and 1.5 times the nominal pressure applied to the lower oil port *, each for 30 seconds, and the product should not be damaged, but the working performance is not required. After the light damage pressure is measured, the product can be used for other purposes.
4.3.5 The pressure pulse is a life test under severe working conditions. The requirements and performance tolerances should be specified in the special technical specifications. Products that have undergone pressure pulse testing are generally not used as products. When the positive current is input, the liquid flows from the control port "A" and flows into the oil "1" from the control port "B", which is determined as the positive flow rate. 4.4.1 The tolerance of the rated flow rate is =10%, and the linearity is not greater than 5%. The resistance is not greater than 1D megawatt.
4.4.5 The ring is not greater than 5%.
4.4.6 The decomposition rate is not greater than 1%.
t.4.7 The pressure gain should be within 40% of the maximum negative The load voltage drop is expressed as the half slope of the load voltage drop to the input current. --When the input current changes by 1%, the negative voltage drop should exceed 30% of the load voltage drop. 4.4.8 The power deviation is +2.5%~.2.5%. 4.4.9 The zero deviation is measured under standard conditions and is not greater than 25% during the acceptance test, and is not greater than 6% during the service life. ±.4.1D The supply pressure is within the range of 80%~110% of the nominal pressure, and the zero source is not less than 2%. 9
GB10844—8 9
4.4.11 The stopping force is within the range of 0.7MP~0.7MP, and the zero drift is not greater than 2. 4.4.12 The temperature zero leakage is when the working fluid temperature changes to 56, and the zero drift is greater than 14%.
4.5 Dynamic characteristics
4.5. The frequency characteristics should be measured under the standard test conditions. The actual input current is measured at the fixed current. Usually the logarithmic characteristic length system ( See Figure 7), the amplitude ratio is measured by the notch bandwidth and the relative bandwidth. The amplitude ratio is
,
24222224442444
Figure 7 shows the half-frequency continuous
20u300
frequency market, H
4.5.1.1 Amplitude bandwidth
When the sinusoidal input current is kept constant, the control method measures the amplitude of the control wind at a low frequency, and the rate corresponding to the decrease of 3dB with the increase of frequency is the amplitude ratio. 4. 5. 1,2 Phase frequency setting
The frequency corresponding to the sinusoidal input current when it is 90 (or 15\) behind the current is the phase frequency bandwidth. 4.6 Ring spot conditions
4.6.1 Temperature density
4.6.1,1 The servo motor should be able to operate within the range of -30-60℃ ambient temperature and 1-30~-90℃ net liquid temperature change pressure. Special requirements are specified in the special control technical conditions
4.6.1.3 Heart When the ambient temperature and working fluid humidity are 3D, the valve should be able to operate at ±50% of the rated voltage. During the test, check the external sealing performance, which should meet the requirements of 4.3.2. 6.1.3 In the working fluid range of 30℃ to 90℃, the performance of the valve should be guaranteed. During the high temperature and cut-off temperature tests, only the rated flow disc (tolerance +23%), zinc content (2%) or belt ring (6℃) are tested. The insulation resistance at high temperature is the bottom strength and the local tightness.5 times the normal force is applied to the oil port*, each for 30 seconds, the product should not be damaged, but the working performance is not required to be restored. After the light damage pressure is reached, the product can be used for other purposes.
4.3.5 The pressure pulse is a life test under severe working conditions. The requirements and performance tolerances should be specified in the special technical specifications. Products that have undergone pressure pulse tests are generally not used. When the positive current is input, the liquid flows from the control port "A" and flows into the oil "1" from the control port "B", which is determined as the positive flow rate. 4.4.1 The tolerance of the rated flow rate is =10%, and the linearity is not greater than 5%. The resistance is not greater than 1D megawatt.
4.4.5 The ring is not greater than 5%.
4.4.6 The decomposition rate is not greater than 1%.
t.4.7 The pressure gain should be within 40% of the maximum negative The load voltage drop is expressed as the half slope of the load voltage drop to the input current. --When the input current changes by 1%, the negative voltage drop should exceed 30% of the load voltage drop. 4.4.8 The power deviation is +2.5%~.2.5%. 4.4.9 The zero deviation is measured under standard conditions and is not greater than 25% during the acceptance test, and is not greater than 6% during the service life. ±.4.1D The supply pressure is within the range of 80%~110% of the nominal pressure, and the zero source is not less than 2%. 9
GB10844—8 9
4.4.11 The stopping force is within the range of 0.7MP~0.7MP, and the zero drift is not greater than 2. 4.4.12 The temperature zero leakage is when the working fluid temperature changes to 56, and the zero drift is greater than 14%.
4.5 Dynamic characteristics
4.5. The frequency characteristics should be measured under the standard test conditions. The actual input current is measured at the fixed current. Usually the logarithmic characteristic length system ( See Figure 7), the amplitude ratio is measured by the notch bandwidth and the relative bandwidth. The amplitude ratio is
,
24222224442444
Figure 7 shows the half-frequency continuous
20u300
frequency market, H
4.5.1.1 Amplitude bandwidth
When the sinusoidal input current is kept constant, the control method measures the amplitude of the control wind at a low frequency, and the rate corresponding to the decrease of 3dB with the increase of frequency is the amplitude ratio. 4. 5. 1,2 Phase frequency setting
The frequency corresponding to the sinusoidal input current when it is 90 (or 15\) behind the current is the phase frequency bandwidth. 4.6 Ring spot conditions
4.6.1 Temperature density
4.6.1,1 The servo motor should be able to operate within the range of -30-60℃ ambient temperature and 1-30~-90℃ net liquid temperature change pressure. Special requirements are specified in the special control technical conditions
4.6.1.3 Heart When the ambient temperature and working fluid humidity are 3D, the valve should be able to operate at ±50% of the rated voltage. During the test, check the external sealing performance, which should meet the requirements of 4.3.2. 6.1.3 In the working fluid range of 30℃ to 90℃, the performance of the valve should be guaranteed. During the high temperature and cut-off temperature tests, only the rated flow disc (tolerance +23%), zinc content (2%) or belt ring (6℃) are tested. The insulation resistance at high temperature is the bottom strength and the local tightness.5 times the normal force is applied to the oil port*, each for 30 seconds, the product should not be damaged, but the working performance is not required to be restored. After the light damage pressure is reached, the product can be used for other purposes.
4.3.5 The pressure pulse is a life test under severe working conditions. The requirements and performance tolerances should be specified in the special technical specifications. Products that have undergone pressure pulse tests are generally not used. When the positive current is input, the liquid flows from the control port "A" and flows into the oil "1" from the control port "B", which is determined as the positive flow rate. 4.4.1 The tolerance of the rated flow rate is =10%, and the linearity is not greater than 5%. The resistance is not greater than 1D megawatt.
4.4.5 The ring is not greater than 5%.
4.4.6 The decomposition rate is not greater than 1%.
t.4.7 The pressure gain should be within 40% of the maximum negative The load voltage drop is expressed as the half slope of the load voltage drop to the input current. --When the input current changes by 1%, the negative voltage drop should exceed 30% of the load voltage drop. 4.4.8 The power deviation is +2.5%~.2.5%. 4.4.9 The zero bias is measured under standard conditions and is not greater than 25% during the acceptance test, and is not greater than 6% during the service life. ±.4.1D The supply pressure is within the range of 80%~110% of the nominal pressure, and the zero source is not less than 2%. 9
GB10844—8 9
4.4.11 The stopping force is within the range of 0.7MP~0.7MP, and the zero drift is not greater than 2. 4.4.12 The temperature zero leakage is when the working fluid temperature changes to 56, and the zero drift is greater than 14%.
4.5 Dynamic characteristics
4.5. The frequency characteristics should be measured under the standard test conditions. The actual input current is measured at the fixed current. Usually the logarithmic characteristic length system ( See Figure 7), the amplitude ratio is measured by the notch bandwidth and the relative bandwidth. The amplitude ratio is
,
24222224442444
Figure 7 shows the half-frequency continuous
20u300
frequency market, H
4.5.1.1 Amplitude bandwidth
When the sinusoidal input current is kept constant, the control method measures the amplitude of the control wind at a low frequency, and the rate corresponding to the decrease of 3dB with the increase of frequency is the amplitude ratio. 4. 5. 1,2 Phase frequency setting
The frequency corresponding to the sinusoidal input current when it is 90 (or 15\) behind the current is the phase frequency bandwidth. 4.6 Ring spot conditions
4.6.1 Temperature density
4.6.1,1 The servo motor should be able to operate within the range of -30-60℃ ambient temperature and 1-30~-90℃ net liquid temperature change pressure. Special requirements are specified in the special control technical conditions
4.6.1.3 Heart When the ambient temperature and working fluid humidity are 3D, the valve should be able to operate at ±50% of the rated voltage. During the test, check the external sealing performance, which should meet the requirements of 4.3.2. 6.1.3 In the working fluid range of 30℃ to 90℃, the performance of the valve should be guaranteed. During the high temperature and cut-off temperature tests, only the rated flow disc (tolerance +23%), zinc content (2%) or belt ring (6℃) are tested. The insulation resistance at high temperature is the bottom strength and the local tightness.
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