Some standard content:
ICS 23.100.30
Machinery Industry Standard of the People's Republic of China
JB/T10366-2002
Hydraulic speed control valve
Hydraulic fluid power---Compensated flow-control valve2002-12-27 Issued
2003-, ~1 Implementation
The State Economic and Trade Commission of the People's Republic of China Issued Foreword
Normative reference documents
3 Terms and definitions,
Quantity, symbol and unit
Marking and basic parameters
5.1 Marking..
5.2 Basic parameters.
6 Technical requirements..
General requirements,
6.2 Performance requirements..
Assembly requirements.
6.4 Appearance requirements
Performance test methods
Test equipment
7.2 Test conditions..
7.3 Test items and test methods.
Inspection of assembly and appearance
Inspection rules
9.1 Inspection classification,
9.2 Sampling.
Judgment rules.
10 Marking, packaging, transportation and storage.…
Appendix A (Normative Appendix) Test circuit and characteristic curve..A..Test circuit.
A.2 Characteristic curve,
Schematic diagram of factory test circuit…
Schematic diagram of type test circuit
Opening-flow characteristic curve
Inlet pressure-internal leakage curve
Outlet pressure-external leakage curve
Inlet pressure change-regulation flow influence curveOutlet pressure change-regulation flow influence curveFigure A.8
Flow-reverse pressure loss curve,
Oil temperature change-regulation flow influence curve
Flow-regulation torque characteristic curve
Test system block diagram,
Transient characteristic curve
ttttee++t
JB/T 10366—2002
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JB/T 10366—2002
Table 1 Quantity, symbol and unit
Table 2 Permissible variation range of average display value of controlled parameterTable 3 Permissible system error of measuring system
Table 4 Factory test items and test methods
Table 5 Type test items and test methods
Table 6 Assembly and appearance inspection methods
Electric and Electric Power
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Appendix A of this standard is a normative appendix.
This standard is proposed by China Machinery Industry Federation. Foreword
This standard is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee. JB/T10366—2002
The drafting units of this standard are: Beijing Huade Hydraulic Industry Group Co., Ltd., Dalian Combined Machine Tool Research Institute Hydraulic Technology Engineering Company, Beijing Machinery Industry Automation Research Institute.
The main drafters of this standard are: Ma Jun, Lin Guang, Liu Xinde. This standard is published for the first time.
1 Scope
Hydraulic speed control valve
JB/T 10366—2002
This standard specifies the basic parameters, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage requirements of hydraulic speed control valves, one-way speed control valves and overflow throttle valves (hereinafter collectively referred to as speed control valves). This standard applies to speed control valves with threaded connections, plate connections and superimposed connections that use hydraulic oil or other liquids with equivalent performance as the working medium.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version is applicable to this standard. GB/T786.1 Hydraulic and pneumatic graphic symbols (GB/T786.1-1993, eqvISO1219-1:1991. Fluid power systems and components--Graphic symbols and circuit diagrams-Part I: Graphic symbols) GB/T2346 Nominal pressure series of hydraulic and pneumatic systems and components GB/T2828 Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T2878 Types and dimensions of threaded oil ports for hydraulic components GB/T7935 General technical conditions for hydraulic components GB/T8098 Installation surface of plate-type hydraulic flow control valves GB/T8099 Installation surface of hydraulic superimposed valves
GB/T14039-2002 Code for solid particle pollution level of hydraulic transmission oil (GB/T14039-2002, ISO4406:1999, MOD)
GB/T 17446
GB/T 17489
1992)
Terms of fluid transmission system and components (GB/T174461998, idtISO5598:1985) Hydraulic particle contamination analysis Extract liquid sample from working system pipeline (GB/T17489-1998, idtISO4021JB/T7858 Hydraulic component cleanliness assessment method and hydraulic component cleanliness index 3 Terms and definitions
The terms and definitions established in GB/T17446 and the following terms and definitions apply to this standard. 3.1
Nominal flow
The nominal flow rate of the speed control valve.
ftest flow
Test flow
The flow specified when testing the performance of the test valve. 4 Quantities, symbols and units
Quantities, symbols and units are shown in Table 1.
JB/T10366—-2002
Nominal diameter of valve
Volume flow
Inner diameter of pipe
Pressure, differential pressure
Mass density of oil
Kinematic viscosity
Etc. Bulk elastic modulus
Note: M—
-Mass: L
5 Marking and basic parameters
5.1 Marking
-Length: T-
Table 1 Quantity, symbol and unit
p, 4pwwW.bzxz.Net
-Time; @-
-Temperature.
Pa (MPa)
s (min)
Clear and permanent markings and nameplates should be made at appropriate and obvious locations on the product. The content of the marking and nameplate should comply with the provisions of GB/T7935, and the graphic symbols used should comply with the provisions of GB/T786.1. 5.2 Basic parameters
The basic parameters of the speed control valve should include: nominal diameter, nominal pressure, nominal flow, rated flow, etc. 6 Technical requirements
6.1 General requirements
6.1.1 The nominal pressure series should comply with the provisions of GB/T2346. 6.1.2 The type and size of the threaded oil port shall comply with the provisions of GB/T2878. 6.1.3 The plate-type connection installation surface shall comply with the provisions of GB/T8098, and the superimposed connection installation surface shall comply with the provisions of GB/T8099. 6.1.4 Other technical requirements shall comply with the provisions of GB/T7935. 6.1.5 The manufacturer shall state the applicable conditions and environmental requirements of the product in the product samples and related materials. 6.2 Performance requirements
The performance requirements of the speed control valve should include:
Working pressure range:
Flow adjustment range:
Minimum stable flow
Internal leakage:
Flow rate of change:
External leakage:
Sealing: Under rated working conditions, the static seal of the speed control valve shall not leak oil, and the dynamic seal shall not drip oil; Pressure resistance: Each pressure-bearing oil port of the speed control valve shall be able to withstand 1.5 times the maximum working pressure of the oil port, and there shall be no external leakage and parts damage.
6.3 Assembly requirements
6.3.1 Assembly requirements shall comply with the provisions of GB/T7935. 6.3.2 Internal cleanliness requirements shall comply with the provisions of JB/T7858. 6.4 Appearance requirements
The appearance of the product shall comply with the provisions of GB/T7935. 7 Performance test method
7.1 Test equipment
7.1.1 The factory test shall have a test bench that complies with the test circuit shown in Figure A.1. 7.1.2 The type test shall have a test bench that complies with the test circuit shown in Figure A.2. 7.1.3 Flow and pressure of oil source
The flow of oil source should be adjustable and should be greater than the test flow of the valve under test. The pressure of the oil source should be able to exceed the nominal pressure of the valve under test by 20% to 30% for a short time. JB/T10366—2002
7.1.4 It is allowed to add components to the given basic test circuit to adjust the pressure, flow or ensure the safe operation of the test system, but it should not affect the performance of the valve under test.
7.1.5 The inner diameter of the pipe and pipe joint connected to the valve under test should be consistent with the actual diameter of the valve under test. 7.1.6 Position of pressure measuring point:
7.1.6.1 The inlet pressure measuring point should be set between the downstream of the disturbance source (such as valve, elbow) and the upstream of the valve under test, and the distance from the disturbance source should be not less than 10d (d is the inner diameter of the pipe), and the distance from the valve under test should be not less than 5d. 7.1.6.2 The location of the outlet pressure measuring point should be set at least 10d downstream of the test valve. When testing according to Class C accuracy, the location of the pressure measuring point is allowed to be inconsistent with the above requirements, but the corresponding correction value should be given. 7.1.6.3
7.1.7 Pressure measuring hole;
The diameter of the pressure measuring hole should be no less than 1mm and no more than 6mm. 7.1.7.1
The length of the pressure measuring hole should be no less than 2 times the diameter of the pressure measuring hole. 7.1.7.2
The axis of the pressure measuring hole is perpendicular to the axis of the pipeline, and the intersection angle between the inner surface of the pipeline and the pressure measuring hole should maintain a sharp edge, but no burrs should be allowed. The inner diameter of the connecting pipe between the pressure measuring point and the measuring instrument shall not be less than 3mm. 7.1.7.4
When the pressure measuring point is connected to the measuring instrument, the air in the connecting pipe should be removed. 7.1.7.5
7.1.8 The temperature measurement point should be set at no more than 15d upstream of the inlet pressure measurement point of the tested valve. 7.1.9 The oil sampling point should be set in the test circuit and the liquid sample should be extracted in accordance with the provisions of GB/T17489. 7.2 Test conditions
7.2.1 Test medium
7.2.1.1 The test medium is general hydraulic oil. 7.2.1.2
Temperature of test medium: Unless otherwise specified, type tests should be carried out at 50℃±2℃, and factory tests should be carried out at 50℃±4℃.
Viscosity of test medium: The kinematic viscosity of oil at 40℃ is 42mm2/s~74mm2/s (special requirements shall be specified separately). 7.2.1.3
7.2.1.4 Cleanliness of test medium: The solid particle contamination level of the test system oil shall not be higher than the level specified in GB/T14039-2002/19/16.
7.2.2 Steady-state condition
7.2.2.1 When the variation range of the average displayed value of the controlled parameter does not exceed the specified value in Table 2, it is regarded as a steady-state condition. The measured value of the test parameter shall be recorded under the steady-state condition.
7.2.2.2 During the type test, the selection of the number of test parameter measurement readings and the distribution of the readings taken shall reflect the performance of the test valve in the entire range.
7.2.2.3 In order to ensure the repeatability of the test results, the test parameters shall be measured at the specified time intervals. 3
JB/T10366-2002
Controlled parameters
See 7.2.5 for the measurement accuracy level.
7.2.3 Transient working condition
2 Allowable variation range of average displayed value of controlled parameter Allowable variation range of average displayed value of controlled parameter corresponding to each measurement accuracy level*
7.2.3.1 The relative position between the loading valve and the test valve can be determined by controlling the pressure gradient between them and limiting the influence of the oil compressibility. The pressure gradient between them can be estimated by the formula
dpqvsK,
, where 9vs is the steady-state flow rate through the test valve 4 set before the test begins, K, is the constant volume elastic modulus of the oil, and V is the oil path connection volume between the test valve 4 and the throttle valves 6-1 and 6-2 in Figure A.2. The pressure gradient estimated by the above formula should be at least 10 times the rate of change of the measured outlet pressure of the test valve 4.
7.2.3.2 The operation time of the hydraulically controlled non-return valve 8 in Figure A.2 shall not exceed 10% of the response time of the test valve 4, and shall not exceed 10ms at most. 7.2.4 Test flow
7.2.4.1 When the specified rated flow of the test valve is less than or equal to 200L/min, the test flow shall be the rated flow. 7.2.4.2 When the specified rated flow of the test valve is greater than 200L/min, the test flow is allowed to be 200L/min, but it must be evaluated under working conditions, and the performance indicators of the test valve are based on meeting the working conditions. 7.2.4.3 The factory test is allowed to be carried out at a reduced flow rate, but the corresponding correction value shall be given to the performance indicator. 7.2.5 Measurement accuracy level
The measurement accuracy level is divided into three levels: A, B, and C. The type inspection shall not be lower than level B, and the factory inspection shall not be lower than level C. The allowable error of the measurement system corresponding to each level shall comply with the provisions of Table 3. Table 3 Allowable systematic error of measurement system
Parameters of measuring instruments and meters of measurement system corresponding to each measurement accuracy level
Pressure (gauge pressure p<0.2MPa)
Pressure (gauge pressure p≥0.2MPa)
7.3 Test items and test methods
7.3.1 Factory test
Factory test items and test methods shall be as specified in Table 4. 4
Allowable error
Test items
Pressure resistance
Flow regulation
Range and minimum
Stable flow
Internal leakage
External leakage
Effect of change in inlet pressure
on regulated
flow
Table 4 Factory test items and test methods
Open the throttle valve 6-1, completely close the test valve 4, adjust the relief valve 2-1, and adjust the pressure from the lowest working pressure, and increase it by 2% per second until it reaches 1/2 of the highest working pressure of the test valve.5 times. After reaching the pressure, maintain the pressure for 5 minutes. Make the inlet and outlet pressure difference of the test valve 4 the minimum working pressure value (for the overflow throttle valve, the throttle valve 6 must be fully opened, and the inlet and outlet pressure difference is not specified), and make the overflow valve 2 in the overflow condition (only for the speed regulating valve and the one-way speed regulating valve). Adjust the adjustment hand wheel of the test valve 4 from full tight to the scale indication value corresponding to the test flow. As the opening size changes, observe the flow change through the flow meter 4 and measure the flow adjustment range. Repeat the test for no less than three times. Close the throttle valve 6 completely, open the stop valve 13, and adjust the test valve 4 when the inlet and outlet pressure difference of the test valve 4 is the minimum working pressure value, so that the flow through the test valve 4 is the minimum stable flow. Then adjust the overflow valve 2, so that the inlet pressure of the test valve 4 changes from the minimum working pressure value to the nominal pressure, and observe the change of the minimum stable flow of the test valve 4 through the stop valve 13. Repeat the test for no less than three times.
Close the throttle valve 6 completely, open the stop valve 13, adjust the regulating hand wheel of the test valve 4 to the fully tight position, and then adjust the relief valve 2 so that the inlet pressure of the test valve 4 is the nominal pressure. Then, adjust the regulating hand wheel of the test valve 4 so that the test valve 4 is opened and then completely closed. After 30 seconds, measure the internal leakage of the test valve 4 through the measuring cup 14.
Open the test valve 4 and adjust the throttle valve 6 so that the outlet pressure of the test valve 4 is 90% of the nominal pressure. After 30 seconds, measure the external leakage at the external leakage port of the test valve 4. Fully open the throttle valve 6 and adjust the test valve 4 so that the flow through the test valve 4 is the minimum control flow. Adjust the relief valve 2 so that the inlet pressure of the test valve 4 changes from the lowest working pressure to the highest working pressure (the measuring points should be no less than 3 points). The flow rate change rate of the test valve 4 when the inlet pressure changes is calculated as follows:
=mx100%/p
Wherein:
At a given set flow, the relative flow rate change rate when the inlet pressure changes, the unit is %/MPa:
When the inlet pressure changes, the maximum change value of the given set flow, the unit is Umin:
Given set flow, here is the minimum control flow, the unit is Lmin;
Inlet pressure change, the unit is MPa.
JB/T10366—2002
Test type
Only test the test valve with an external
leakage port.
Only for speed regulating valves and one-way speed regulating valves.
JB/T 10366---2002
Test items
Effect of outlet pressure change on regulated flow
Reverse pressure loss
Through throttling
Table 4 (continued)
Adjust relief valve 2 to the nominal pressure of test valve 4, and adjust test valve 4 so that the flow through test valve 4 is the minimum control flow. Then adjust the throttle valve 6 to make the outlet pressure of the test valve 4 vary from 5% to 90% of the nominal pressure (there should be no less than 3 measuring points). Test the flow rate change rate of the test valve 4 when the outlet pressure changes. The calculation formula is as follows:
ve=4vmx100%/4P2
Wherein:
v2—the relative flow rate change rate when the outlet pressure changes at a given set flow, in %/MPa
When the outlet pressure changes, the maximum change value of the given set flow, in L/min:
given set flow, here is the minimum control flow, in Umin
change in outlet pressure, in MPa.
Adjust the adjusting hand wheel of the test valve to the fully tight position, and change the manual reversing valve to the right position, so that the flow rate through the test valve 4 in the reverse direction is the test flow rate, and use pressure gauges 3-2 and 3-1 to measure the pressure, and the pressure difference is the reverse pressure loss of the test valve 4.
Adjust the throttling adjusting hand wheel of the test valve 4 to the fully loose position, and make the pressure loss through the valve
Sealing
7.3.2 Type test
The flow rate is the test flow rate, and use pressure gauges 3-1 and 3-2 to measure the pressure, and the pressure difference is the throttling valve pressure loss of the test valve 4.
First, clean the valve under test. If some parts cannot be cleaned at once and "false" leakage occurs after operation, it is allowed to be cleaned again. The inspection contents are divided into two categories: static seal and dynamic seal:
(1) Static seal: stick clean absorbent paper on the static seal and remove it at the end of the test. If there is oil stain on the absorbent paper, it is oil leakage. (2) Dynamic seal: place white paper under the dynamic seal and at the end of the test, if there is oil drop on the white paper, it is oil dripping.
Type test items and test methods shall be in accordance with the provisions of Table 5. 6
Test type
For overflow throttling valves, this item is necessary
Only for one-way speed regulating valves.
Only for overflow throttling valves.
, Test items
Steady-state characteristics
Table 5 Type test items and test methods
Test method
Test all items in accordance with the provisions of 7.3.1, and test and draw the characteristic curve diagram in accordance with the following method: a)
JB/T10366—2002
In the flow regulation range test, the flow regulation characteristics under different openings (number of diagrams) should be tested, during which several opening positions are set (the number of set opening positions should be sufficient to draw the opening-flow characteristic curve), measure the flow passing through the test valve 4 at different opening positions, and draw the opening-flow characteristic curve (see Figure A.3).
In the internal leakage test, the inlet pressure of the test valve 4 is gradually increased from zero to the nominal pressure. During this period, several measuring points are set (the number of measuring points set should be sufficient to draw the inlet pressure-internal leakage curve). The internal leakage of the test valve 4 is measured point by point, and the inlet pressure-internal leakage curve is drawn (see Figure A.4).
In the external leakage test, the outlet pressure of the test valve 4 is gradually increased from 5% of the nominal pressure to 90% of the nominal pressure. During this period, several measuring points are set (the number of measuring points set should be sufficient to draw the outlet pressure-external leakage curve). The external leakage of the test valve 4 is measured point by point, and the outlet pressure external leakage curve is drawn (see Figure A.5).
When testing the influence of inlet pressure change on regulating flow, adjust the test valve 4 to the minimum stable flow and test flow, and increase the inlet pressure of the test valve 4 gradually from the lowest working pressure to the highest outlet pressure.
External leakage amount
curve (see Figure
When there is an external leakage port
, draw this curve
Inlet pressure
Change-regulating
Flow influence curve (see Figure A.6)
Only regulating
working pressure, set several measuring points in between (the set measuring points should be sufficient to depict the influence curve of inlet pressure change! Valve, one-way speed regulation
Change on regulating flow), measure the flow through the test valve 4 point by point, And draw the inlet pressure change-regulating flow rate influence curve (see Figure A.6). e)
When testing the influence of outlet pressure change on regulating flow, adjust the test valve 4 to the minimum stable flow rate and test flow rate, and gradually increase the outlet pressure of the test valve 4 from 5% of the nominal pressure to 90% of the nominal pressure, set several measuring points (the number of measuring points set should be sufficient to draw the outlet pressure change-regulating flow rate influence curve (as shown in Figure A.6), measure the flow through the test valve 4 point by point, and draw the inlet pressure change-regulating flow rate influence curve (see Figure A.7). During the reverse pressure loss test, the reverse flow rate through the test valve 4 is gradually increased from zero to the test flow rate, and several measuring points are set during this period (the number of measuring points set should be sufficient to draw the flow rate-reverse pressure loss curve), and the reverse pressure loss of the test valve 4 is measured point by point, and the flow rate-reverse pressure loss curve is drawn (see Figure A.8).
(2) Test on the influence of oil temperature change on the flow rate regulation: Fully open the throttle valve 6, adjust the relief valve 2 at 20℃, and make the inlet pressure of the test valve 4 be 6.3MPa, and make the flow through the test valve 4 2 times the minimum flow and the test flow, and gradually increase the inlet oil temperature of the test valve 4 from 20℃ to 70℃. Measure the flow rate every time the oil temperature rises by 10℃, and test the flow rate change rate when the oil temperature changes. The calculation formula is as follows:
AAv=4x00%/A
Where:
Under a given set flow, the flow rate change rate when the oil temperature changes, the unit is %/℃: When the oil temperature changes, the maximum change value of the given set flow, the unit is L/min; a given set flow, here is 2 times the minimum control flow and the test flow unit is Vmin
Oil temperature change, the unit is ℃.
And draw the oil temperature change-adjustment flow influence curve (see Figure A.9). Draw this curve.
Only the temperature
compensated speed regulating valve
and temperature compensated
check speed regulating valve
and temperature compensated
relief and throttling
valve are tested.
JB/T10366--2002
No.Test Item
(3) Adjustment torque test:
Table 5 (continued)
Adjust the relief valve 2 and the throttling valve 6 so that the outlet pressure through the test valve 4 is 90% of the nominal pressure and the flow through the test valve 4 is the test flow. Then, adjust the test valve 4 so that the flow through the test valve 4 gradually decreases from the test steady-state characteristic
transient characteristic
flow to the minimum stable flow, and then gradually increases from the minimum stable flow to the test flow (during the adjustment process of the test valve 4, the outlet pressure is allowed to change). During this period, set several measuring points (the number of measuring points set should be sufficient to describe the flow-regulating torque characteristic curve), use the torque meter to measure the regulating torque during the adjustment process of the test valve 4, and draw the flow-regulating torque characteristic curve (see Figure A.10) Test system block See Figure A.11. The test method is as follows: Switch the manual reversing valve 7-1 to the right position, adjust the relief valve 2-1, make the inlet pressure of the test valve 4 the nominal pressure, and make the flow through the test valve 4 the test flow 4vs: a) Switch the electromagnetic reversing valve 7-2 to the right position, make the hydraulic control check valve 8 reverse closed, adjust the throttle valve 6-1, make the pressure difference 4p when qvs passes through the throttle valve 6-1, be 90% of the nominal pressure of the test valve 4, and use the formula K=ys/VAp,
to calculate the calculation coefficient K of the throttle valve 6-1. Ap, is the reading difference between the pressure gauges 3-2 and 3-3. (1)
b) Switch the electromagnetic reversing valve 7-2 to the left position, so that the hydraulic control check valve 8 opens in the reverse direction: adjust the throttle valve 6-2, so that the pressure difference 4p when qvs passes through the parallel oil circuit of the throttle valves 6-1 and 6-2 is 10% of the nominal pressure of the test valve 4, and Ap is still the reading difference between the pressure gauges 3-2 and 3-3. The calculated flow gv,=qvs/4p
（2）
can be used as the starting flow of the test valve 4 in the transient process, that is, as the starting time of the transient response time of the test valve 4.
Switch the electromagnetic reversing valve 7-2 to the right position, so that the hydraulic control check valve 8 is opened and closed, causing a pressure step.
Use one of the following two methods to carry out transient test: The first method is an indirect method:
This method uses pressure sensors 3-2 and 3-3 to measure the instantaneous pressure difference Ap of the throttle valve 6-1, and uses the formula qv=KyAp
to calculate the instantaneous flow qv through the test valve 4. According to the above formula, using the recorded Ap-1 curve, the instantaneous flow q can be calculated point by point, thereby drawing the 9-t curve shown in Figure A.12, and the response time, transient recovery time and flow overshoot rate of the test valve 4 can be calculated from the figure. Second method -
- direct method:
This method uses pressure sensors 3-2 and 3-3 to measure the instantaneous pressure difference 47 of the throttle valve 6-1, and uses flow sensor 5 to measure the instantaneous flow through the test valve 4. Since the instantaneous pressure difference △p of the throttle valve 6-1 and the instantaneous flow of the test valve 4 can be approximately considered to be in phase, the pressure sensor can be used to calibrate the accuracy of the flow sensor phase. From the recorded Ap-t curve and gt curve (as shown in Figure A.12), the response time, transient recovery time and flow overshoot rate of the test valve 4 can be calculated. Preparation
Recommended to use
Second method
Direct method.
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