GB 25974.3-2010 English PDF (GB25974.3-2010)

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GB 25974.3-2010: [GB/T 25974.3-2010] Powered support for coal mine -- Part 3: The hydraulic control system and valves
GB 25974.3-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.100
D 97
Powered support for coal mine - Part 3: The hydraulic
control system and valves
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: JUNE 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions... 7 
4 Categories ... 10 
4.1 Product categories ... 10 
4.2 Product model ... 10 
5 Requirements ... 13 
5.1 General requirements ... 13 
5.2 Requirements for hydraulic control system ... 13 
5.3 Valve requirements ... 15 
6 Test methods ... 21 
6.1 Test conditions ... 21 
6.2 Test method for hydraulic control system ... 22 
6.3 Part manufacturing quality ... 23 
6.4 Test method for yield valve ... 23 
6.5 Test method for pilot check valve ... 27 
6.6 Test method for directional valve ... 31 
6.7 Test method for shut-off valve ... 36 
6.8 Test methods for other valves ... 38 
7 Inspection rules ... 38 
7.1 Inspection classification ... 38 
7.2 Inspection items ... 39 
7.3 Group-batching rules and sampling scheme ... 40 
7.4 Sampling method ... 44 
7.5 Judgment rules ... 45 
8 Marking, packaging, storage ... 45 
Appendix A (Normative) Technical requirements for coating of valve parts ... 46 
Powered support for coal mine - Part 3: The hydraulic
control system and valves
1 Scope
This Part of GB 25974 specifies the terms and definitions, classification, requirements,
test methods, inspection rules, marking, packaging and storage of hydraulic control
systems and valves for powered supports for coal mines (hereinafter referred to as
supports).
This Part is applicable to the hydraulic control systems and valves of various coal mine
supports and other equipment with supporting functions, including various hydraulic
control systems, yield valves, pilot check valves, directional valves, shut-off valves, etc.
This Part does not apply to the valves inside the superchargers, columns, jacks (such as
column bottom valves).
2 Normative references
The provisions in following documents become the provisions of this Part through
reference in this Part of GB 25974. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Part; however,
parties who reach an agreement based on this Part are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition of
the referenced document applies.
GB/T 197-2003 General purpose metric screw threads - Tolerances (ISO 965-1:1998,
MOD)
GB/T 321-2005 Preferred numbers - Series of preferred numbers (ISO 3:1973, IDT)
GB/T 699 Quality carbon structural steels
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for features
without individual tolerance indications (eqv ISO 2768-2:1989)
GB/T 1220 Stainless steel bars
GB/T 1239.1 Cold coiled helical springs technical specifications - Part 1: Extension
spring
GB/T 1239.2 Cold coiled helical springs technical specifications - Part 2:
Compressions spring
GB/T 1239.3 Cold coiled helical springs technical specifications - Part 3: Torsion
spring
GB/T 1239.4 Cold coiled helical springs technical specifications - Part 3: Torsion
spring
GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits - Part
1: Bases of tolerances deviations and fits (ISO 286-1:1988, MOD)
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions
without individual tolerance indications (eqv ISO 2768-1:1989)
GB/T 2828.1-2003 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection (ISO 2859-1:1999, IDT)
GB/T 2829-2002 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-
sections, tolerances and size identification code (GB/T 3452.1-2005, ISO 3601-
1:2002, MOD)
GB/T 3452.2 Fluid power systems - O-rings - Part 2: Quality acceptance criteria
(GB/T 3452.2-2007, ISO 3601-3: 2005, IDT)
GB/T 3452.3 Housing dimensions for O-ring elastomer seals in hydraulic and
pneumatic applications
GB/T 9439 Grey iron castings
GB/T 9799 Metallic coatings - Electroplated coatings of zinc on iron or steel (GB/T
9799-1997, eqv ISO 2081:1986)
GB/T 11352 Carbon steel castings for general engineering purpose (GB/T 11352-
2009, ISO 3755:1991; ISO 4990:2003, MOD)
GB/T 13306 Plate
GB/T 13319 Geometrical Product Specifications (GPS) - Geometrical tolerancing -
Positional tolerancing (GB/T 13319-2003, ISO5458:1998, IDT)
JB/T 3338.1 Cylindrical helical compression springs for hydraulic parts - Technical
conditions
MT 76 Emulsifying oil concentrate and high-water content hydraulic fluid used for
powered support and prop
MT/T 98 Inspection specifications of hose and hose kit for powered support
MT/T 986 Quick adapter with U pin and accessories for mine
3 Terms and definitions
The following terms and definitions apply to this Part of GB 25974.
3.1
Nominal pressure
The nominal pressure of the valve, which is determined by the basic parameters.
3.2
Nominal flow-rate
The nominal flow-rate of the valve, which is is determined by the basic parameters.
3.3
Open pressure of yield valve
The opening pressure, which is determined when the yield valve is in use.
3.4
Close pressure of yield valve
The stable pressure, which is maintained after the yield valve stops overflowing.
3.5
Close pressure of check valve
The stable pressure, which can be maintained after the system is decompressed AND
the check valve is closed, when the system supplies liquid to other components
through the check valve.
3.6
Open pressure
The pressure, at which the liquid starts passing through the valve, after the system
5 Requirements
5.1 General requirements
5.1.1 The nominal flowrate parameters shall meet the requirements of 4.2.7 and 4.2.8.
The nominal pressure parameters shall meet the requirements of 4.2.9 and 4.2.10.
5.1.2 The working fluid shall meet the requirements of MT 76.
5.1.3 The temperature of the working fluid shall be in the range of (10 ~ 50) °C.
5.2 Requirements for hydraulic control system
5.2.1 Integrity
The hydraulic control system shall be installed, according to the requirements of the
design drawings. There shall be neither missing parts nor wrong-installed parts.
5.2.2 Tightness performance
The hydraulic control system shall not have abnormal seepage, during normal operation.
5.2.3 Action control
The control of the support action by the master control system or neighbor control
system, as well as the lowering speed, moving speed, lifting speed of the controlled
system shall meet the design requirements; it shall not have any error actions.
5.2.4 Setting pressure and assurance system for setting force
The setting pressure of the support shall be greater than 90% of the pressure of the pump
station. When the pressure of the column piston cavity is greater than 8 MPa, the
assurance system for setting force starts to perform the setting force assurance function;
this function shall be terminated at any ti...