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GB/T 17491-2011 (GB/T 17491-2023 Newer Version) PDF English


Search result: GB/T 17491-2011 (GB/T 17491-2023 Newer Version)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB/T 17491-2023English444 Add to Cart 4 days Hydraulic fluid power -- Pumps, motors -- Methods of testing steady-state performance Valid
GB/T 17491-2011English150 Add to Cart 0-9 seconds. Auto-delivery. Hydraulic fluid power -- Positive displacement pumps, motors and integral transmissions -- Methods of testing and presenting basic steady state performance Obsolete
GB/T 17491-1998English839 Add to Cart 4 days Hydraulic fluid power--Positive displacement pumps, motors and integral transmissions--Determination of steady-state performance Obsolete
BUY with any currencies (Euro, JPY, GBP, KRW etc.): GB/T 17491-2011     Newer/related standards: GB/T 17491-2023

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GB/T 17491-2011: PDF in English (GBT 17491-2011)

GB/T 17491-2011 GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 23.100.10 J 20 Replacing GB/T 17491-1998 Hydraulic fluid power - Positive capacity pumps, motors and integral transmissions - Methods of testing and presenting basic steady state performance (ISO 4409.2007, MOD) ISSUED ON. JUNE 16, 2011 IMPLEMENTED ON. MARCH 01, 2012 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of Contents Foreword ... 3  Introduction ... 5  1 Scope ... 6  2 Normative references ... 6  3 Terms and definitions ... 7  4 Symbols and units ... 11  5 Test ... 12  6 Result expression ... 22  7 Indication explanation ... 25  Appendix A (Informative) Practical unit application ... 26  Appendix B (Normative) Error and measurement accuracy classes ... 28  Appendix C (Informative) Checklist before test ... 30  Foreword This Standard was drafted in accordance with the rules specified in GB/T 1.1- 2009. This Standard replaces GB/T 17491-1998 "Hydraulic pumps, motors and integral transmissions - Measurement of steady-state performance". As compared with GB/T 17491-1998, the main technical changes are as follows. - ADD the integral transmission test circuit; - DELATE the test curves of hydraulic pumps, motors and integral transmission. Using re-drafting method, this Standard modifies and adopts ISO 4409.2007 “Hydraulic fluid power - Positive capacity pumps, motors and integral transmissions - Methods of testing and presenting basic steady state performance” (English version). The technical differences between this Standard and ISO 4409.2007 AND their causes are as follows. - In normative references, this Standard has made adjustments with technical differences to adapt to China’s technical conditions. The adjustments are mainly reflected in Chapter 2 "Normative references". The specific adjustments are as follows. ● USE GB 3102 (all parts) which equivalently adopts international standard to replace ISO 31 (all parts) (see 4). ● USE GB/T 786.1 which equivalently adopts international standard to replace ISO 1219-1 (see 4). ● USE GB/T 17446 which equivalently adopts international standard to replace ISO 5598 (see 3). ● USE GB/T 17485 which equivalently adopts international standard to replace ISO 4391 (see 4). ● USE JB/T 7033 which adopts international standard through modification to replace ISO 9110-1 (see 5.1.1). - CORRECT the unit error of “Rotational frequency” in Table 1 of international standard. Hydraulic fluid power - Positive capacity pumps, motors and integral transmissions - Methods of testing and presenting basic steady state performance 1 Scope This Standard specifies the measurement method for the steady state performance and efficiency of positive capacity pumps, motors and integral transmissions for the purposes of hydraulic transmission, as well as, under steady state conditions, the expression of the test apparatus, the test program requirements and test results. This Standard applies to the positive capacity hydraulic pumps, motors and integral transmissions. 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this Standard. GB/T 786.1 Fluid power systems and components - Graphic symbols and circuit diagrams - Part 1. Graphic symbols for conventional use and data- processing applications (GB/T 786.1-2009, ISO 1219-1.2006, IDT) GB 3102 (all parts), Quantities and units [GB 3102-1993, eqv ISO 31.1992 (all parts)] GB/T 17446 Fluid power systems and components - Vocabulary (GB/T 17446-1998, idt ISO 5598.1985) GB/T 17485 Hydraulic fluid power - Pumps, motors and integral transmissions - Parameter definitions and letter symbols (GB/T 17485-1998, idt ISO 4391.1983) JB/T 7033 Hydraulic fluid power - General measurement principles (JB/T 7033-2007, ISO 9110-1.1990, MOD) ISO 9110-2 Hydraulic fluid power - Measurement techniques - Part 2. Measurement of average steady state pressure in a closed conduit 3 Terms and definitions The terms and definitions as defined in GB/T 17446 as well as the followings apply to this document. NOTE. When it is no risk of ambiguity, the subscripts P, M and T used to distinguish pumps, motors or integral transmissions can be omitted. 3.1 Volume flow rate qV It refers to the volume of fluid flowing through the channel’s cross section in unit time. 3.2 Drainage flow rate qVd It refers to the volume flow rate from the component casing. 3.3 Pump effective outlet flow rate It refers to, at the temperature of θ2,e and pressure of p2,e, the actual flow rate measured at the pump outlet. NOTE. If the flow rate is measured at other locations than the pump outlet, then at the temperature of θ and pressure of p, the measured flow rate shall be corrected by the equation (1), so as to obtain the effective outlet flow values. 3.4 Motor effective inlet flow rate It refers to, at the temperature of θ1,e and pressure of p1,e, the actual flow rate measured at the motor inlet. 3.14 Pump overall efficiency It refers to the ratio between the power obtained and the input mechanical power when the liquid passes through pump. 3.15 Pump volumetric efficiency It refers to, under specified conditions, the ratio between the pump actual output flow rate and the product of derived capacity Vi and shaft speed. 3.16 Motor overall efficiency It refers to the ratio between the motor output mechanical power and the input hydraulic power. 3.17 Motor volumetric efficiency It refers to, under specified conditions, the ratio between the product of motor derived capacity Vi and shaft speed n and the actual input flow rate. 3.18 Motor hydro-mechanical efficiency It refers to the ratio between motor shaft torque and motor theoretical torque. b 1Pa = 1N/m2. 5 Test 5.1 Requirements 5.1.1 Overview Test equipment shall be designed to prevent air entrainment, AND be able to exclude all free air from the system before testing. The installation, connection and operation of the test unit in the test circuit shall comply with the manufacturer's requirements, see Appendix C. It shall record the ambient temperature in the test area. In the test circuit, it shall equip with filter which complies with the filter criteria as required by the test unit manufacturer, AND it shall indicate the location and quantity of the filters used in the test circuit as well as the model of each filter. When conducting pressure measurement in the pipelines, it shall meet the requirements of JB/T 7033 and ISO 9110-2. When conducting temperature measurement in the pipelines, the temperature measurement point shall be kept away from the components AND meanwhile away from the pressure measurement point for 2 times ~ 4 times of the pipeline diameter. Figure 1 to Figure 4 show the basic circuit, in which the safety device is not equipped to avoid system damage when the system fails. During the test, it shall take safety measures to prevent personnel and equipment from being harmed. 5.1.2 Test unit installation INSTALL the test unit into the test circuit as shown in Figure 1 to Figure 4. 5.1.3 Test conditions Before conducting test, the test unit shall be subject to running-in in accordance with the manufacturer's recommendations. 5.1.4 Test fluid Since the component performance may vary significantly with fluid viscosity, so when it is tested, it shall use the oil which is recommended by the manufacturer. a As for the pipe length, see 5.1.1. Figure 2 Pump test circuit (closed circuit) 5.2.2 Inlet pressure In each test, it shall, in accordance with the manufacturer's requirements, maintain the inlet pressure at a constant value within the allowable range (see Table 3). If required, CONDUCT test at different inlet pressures. 5.2.3 Test measurement RECORD the following measurement data. a) Input torque; b) Outlet flow rate; c) Drainage flow rate (if applicable); d) Fluid temperature. At constant rotational frequency (see Table 3) and certain output pressure, MEASURE a set of data, in order to, within the entire range of the outlet pressure, provide the representative indication of pump performance. At other rotational frequency, REPEAT the measurement from 5.2.3 a) ~ d), in order to, within the entire range of rotational frequency, provide the representative indication of pump performance. 5.2.4 Variable capacity At the minimum rotational frequency and minimum outlet pressure which are specified by the test, if the pump is a variable ca... ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.