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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard is under the jurisdiction of CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd.
Cut-out Cock for EMU/DMU
1 Scope
This standard specifies the type dimension and designation, technical requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of cut-out cock for EMU/DMU (hereinafter referred to as cut-out cock).
This standard is applicable to cut-out cock with nominal pressure less than or equal to 1,000kPa for EMU/DMU.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 1184-1996 Geometrical Tolerances for Features without Individual Tolerance Indications (eqv ISO 2768-2:1989)
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (eqv ISO 2768-1:1989)
GB/T 4208-2008 Degrees of Protection Provided by Enclosure (IP Code) (IEC 60529:2001, IDT)
CB/T 6414 Castings - System of Dimensional Tolerances and Machining Allowances (GB/T 6414-1999, eqv ISO 8062:1994)
GB/T 7306.2-2000 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints are Made on the Threads - Part 2: Taper Internal and External Threads (eqv ISO 7-1:1994)
GB/T 7307 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints are Not Made on the Threads (GB/T 7307-2001, eqv ISO 228-1:1994)
GB/T 10125-1997 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests (eqv ISO 9227:1990)
CB/T 21413.1-2008 Railway Applications - Electric Equipment for Rolling Stock - Part 1: General Service Conditions and General Rules (IEC 60077-1:1999, IDT)
GB/T 21563-2008 Railway Applications - Rolling Stock Equipment - Shock and Vibration Tests(IEC 61373:1999, IDT)
HG/T 2903-1997 Finely Granular Polytetrafluoroethylene Resin Used for Molding
TB/T 3217-2009 Semi-spherical Angle Cock for Locomotive
TB/T 3218-2009 Air Brake Fitting Guard for Railway Rolling Stock
3 Type Dimension and Designation
3.1 Type Dimension
Cut-out cock may be classified into two types, i.e. cut-out cock with/without electric signal output; tube-type installation or plate-type installation may be adopted for each type.
Type dimension is detailed in Annex A. For the type not listed in Annex A, its dimension is determined through negotiation between the supplier and the purchaser.
3.2 Designation
Model designation of cut-out cock is defined as follows:
Designation example:
For the cut-out cock with air vent, whose nominal diameter is DN15, joint thread is G thread, handle is long, red and at air inlet side, and which is closed via counterclockwise rotation, it is designated as: DN15G/1A3LE TB/T 3456-2016 Cut-out Cock for EMU/DMU.
Key
1, 2, 3, 4—Handle position when the cut-out cock is open; butterfly handles are at positions 1 and 2;
P1——Air Inlet;
P2——Air outlet;
V——Airflow direction;
L——Counterclockwise rotation:
R——Clockwise rotation.
Figure 1 Initial Position Code of Handle
4 Technical Requirements
4.1 General Requirements
4.1.1 Cut-out cock shall meet the requirements of this standard or those specified in the technical agreement for the supplier and the purchaser.
4.1.2 Cut-out cock shall be able to operate normally at ambient temperature of -25℃~+70℃, and special service environment may be determined by the supplier and the purchaser through negotiation.
4.1.3 Vibration and shock of cut-out cock shall meet the requirements of Class 1 in CB/T 21563-2008.
4.1.4 Stop shall be set at open position and closed position of cut-out cock.
4.1.5 Electric signal system and output logic shall meet the design requirements.
4.2 Material Requirements
4.2.1 Such materials as stainless steel, copper alloy and anti-rust treated aluminum alloy should be adopted for the metal components of cut-out cock. If carbon steel material is adopted, the rusted area shall not be greater than 5% of total area after 56h salt spray test.
4.2.2 Low-temperature resistant nitrile rubber or polytetrafluoroethylene should be used for sealing gasket, and polytetrafluoroethylene shall meet the requirements of HG/T 2903-1997.
4.2.3 Rubber part shall meet the requirements of TB/T 3217-2009 or determined through negotiation between the supplier and the purchaser.
4.2.4 Fire protection design shall be adopted for exposed non-metallic material such as electrical components of cut-out cock.
4.3 Requirements of Manufacture and Assembling
4.3.1 Limit deviation of undeclared dimensional tolerance of the machining parts shall be in accordance with Grade m in GB/T 1804; the undeclared geometrical tolerance shall be in accordance with Grade K in GB/T 1184. Undeclared dimensional tolerance of stainless steel castings shall be in accordance with Grade CT8 in CB/T 6414; undeclared dimensional tolerance of other castings shall be in accordance with Grade CT9 in GB/T 6414 and higher grade of undeclared dimensional tolerance is allowed.
4.3.2 Unsealed tube thread shall meet the requirements of GB/T 7307 and sealed tube thread shall meet those specified in GB/T 7306.2-2000.
4.3.3 Surface of parts shall be free from such defects as crack, pore, sand hole, burr, flash, scratch, dents and rustiness.
4.3.4 Thread surface of parts shall be free from such defects as bump damage, burr and scratch.
4.3.5 When the cut-out cock is assembled, the burrs, dirt and adhesive foreign materials on all components shall be cleaned up; proper amount of GP-9 or 7057 silicone grease should be applied on the surface of sealing ring, valve core and seal seat on the valve rod.
4.4 Performance Requirements
4.4.1 Strength for water-pressure resistance
Under 1,500kPa water pressure, all surfaces and joint surfaces of cut-out cock shall be free from leakage phenomenon, and all parts shall be free from deformation and damage phenomena.
4.4.2 Torque
When cut-out cock is open/closed, the torque applied on the handle of cut-out cock shall not be greater than those specified in Table 1.
Foreword i
1 Scope
2 Normative References
3 Type Dimension and Designation
3.1 Type Dimension
3.2 Designation
4 Technical Requirements
4.1 General Requirements
4.2 Material Requirements
4.3 Requirements of Manufacture and Assembling
4.4 Performance Requirements
5 Inspection Methods
5.1 Appearance and Dimension Inspection
5.2 Hydraulic Pressure Strength Test
5.3 Torque Test
5.4 Air-tightness Test
5.5 Vibration and Shock Test
5.6 Salt Spray Test
5.7 Electrical Performance Test
5.8 Insulation and Voltage Resistance Test
5.9 Protection Degree Test
6 Inspection Rules
6.1 Type Inspection
6.2 End-of-manufacturing Inspection
7 Marking, Packaging, Transportation and Storage
Annex A (Normative) Type Dimension and Designation of Cut-out Cock for EMU/DMU
