MT / T765-1997 People's Republic of China Ministry of Coal Industry 1997-12-30 Approval 1998-06-01 implementation 1 Scope This standard specifies the requirements for automatic support spray control valve, test methods, inspection rules, signs, packaging, transportation And storage. This standard applies to coal mine hydraulic support with a variety of automatic spray control valve. 2 Normative references The following standards contain provisions which, through reference in this text, constitute the provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised, the parties using this standard should explore the possibility of using the latest version of the standard. GBl91-90 packaging, storage and transportation pictorial signs GB / T6388-86 shipping package receiving and dispatching signs GB / T13264-91 non-conforming sample rate sampling procedures and sampling tables GB / T14437-93 product quality monitoring a supervised sampling Test procedures (for a larger total case) GB / T15482-1995 Product Quality Supervision, a small total sample count sampling procedures and sampling table MT76-83 emulsified oil hydraulic support 3 Definitions This standard uses the following definition. 3.1 Hydraulic support with automatic spray control valve controlvalveofautomaticsprayonhydraulicsupports Installed in the coal mine hydraulic support and its corresponding hydraulic piping connected to the corresponding handle when the operation of the stent to support the use of the working fluid to automatically open or close the spray water circuit (hereinafter referred to as Control valve). 3.2 Working fluid operatingemulsion Control valve to open or close and have a certain pressure emulsion. 3.3 open pressure openingpressure control valve to open the minimum pressure required, in units of MPa. 4 Requirements Control valves shall comply with the provisions of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1 Ambient Temperature Ambient temperature 4 ~ 40 â„ƒ under normal conditions. 4.2 Appearance The appearance of the surface smooth, and should be corrosion protection layer, the protective layer should be uniform, no flaking, no scratches; shell deformation, cracking, corrosion and mechanical damage; clearly marked water inlet, outlet and working fluid into Liquid hole; nameplate installed securely, writing clearly. 4.3 Interface Inlet, outlet and working fluid into the liquid hole interface should be quick connector form, interface size and surface roughness should be in accordance with this standard Appendix A (standard appendix) requirements, the interface after the test without water seepage phenomenon. 4.4 Strength Control Valve fluid rated pressure of 32MPa, 1.5 times the rated working pressure from the control valve into the liquid inlet pressure test, no liquid discharge, the shell and parts do not produce any deformation or damage. 4.5 Loss of resistance When water flows through the control valve at a flow rate of 20 L / min, the pressure difference across the inlet and outlet should not exceed 0.1 MPa. 4.6 open pressure water pressure in the range of 1.0 ~ 7.0MPa, the opening pressure should not exceed 2MPa. 4.7 The use of water pressure in the range of 1.0 ~ 7.oMPa water pressure test control valve should be able to open and close normally, the control valve can not be opened or closed during the test phenomenon. 4.8 Service life After 4000 cycles test, the seal shall comply with the provisions of 4.9. 4.9 Sealing Table 1 sealing test method for testing, the test pressure should be no pressure drop. Working fluid rated pressure and the use of water pressure range, after 2h regulator test, the working fluid should not have pressure drop. 5 Test Methods 5.1 Test System Test system shown in Figure 1. 5.2 Test Equipment and Equipment 5.2.1 Pressure Gauge: Range of 0 ~ 1.6MPa and 0 ~ 40MPa two, accuracy of 1.5. 5.2.2 meter: rated pressure â‰¥ 7.0MPa, rated flow â‰¥ 30L / min. 5.2.3 stopwatch: ordinary mechanical stopwatch or electronic stopwatch. 5.2.4 spray pump: rated pressure â‰¥ 7.0MPa, rated flow â‰¥ 30L / min. 5.2.5 working fluid pump: rated pressure â‰¥ 32MPa. 5.2.6 valve: hydraulic support with a valve. 5.2.7 Counter: Blood cell counter. 5.2.8 Pressure device: rated pressure â‰¥ 48MPa. 5.3 Test conditions 5.3.1 Test spray water temperature 4 â„ƒ ~ 40 â„ƒ. 5.3.2 Test Working Fluid The emulsified oil or rust-proof low-condensable 5 # hydraulic oil formulated by MT76-83 emulsified oil and neutral soft water according to 5:95 weight ratio is used. 5.3.3 working fluid temperature control at 10 â„ƒ ~ 50 â„ƒ. 5.3.4 spray water and working fluid should be filtered with a filter accuracy of 0.125mm filter. 5.3.5 The outlet of the control valve should be connected with a certain number of nozzles so as to meet the requirements of the flow rate when the resistance is measured. 5.4 Test Items and Methods 6 Inspection Rules 6.1 Product Inspection sub-factory inspection and type inspection of two. 6.2 factory inspection: 6.2.1 control valve should be the manufacturer quality inspection department inspection, inspection and issued to qualified before leaving the factory. 6.2.2 Batch Criteria: Control valves should be approved in batches. An inspection lot may consist of a production lot. When a production lot number N <100, it may consist of several lots that meet the following conditions: - Production lots are manufactured under substantially the same materials, processes and equipment, etc. ; - A number of production batches constitute a test batch of time does not exceed 30d. 6.2.3 Sampling methods and determination rules: should be consistent with the provisions of GB / T13264. - Producer risk quality of 5%, the use of risk-based quality, 35%; - The use of a sampling plan; - - Classification of nonconforming products: Not classified; 6.3 Type test: 6.3.1 In the event of For a time, type testing should be carried out. - trial production of new control valves or switch to factory production; - 4 years of product production regular inspection; - stop production for more than 3 years to resume production; - After the formal production, in the structure, technology and materials have major changes, May affect the performance of the control valve; - When the factory inspection and the last type test results are quite different; - When the national quality supervision agency proposed type inspection requirements. 6.3.2 Type inspection by the state authorized unit responsible for. 6.3.3 Sampling methods and judgment rules: When the supervision of the overall amount of N> 250, should be consistent with the provisions of GB / T14437; when the overall supervision of N â‰¤ 250, should be consistent with the provisions of GB / T15482. The implementation of several elements are as follows: - Classification of nonconforming products: not classified; - product quality supervision level of 5%; - When using GB / T14437, test level selection â…¡; using GB / T15482, supervision and inspection Level selection of the first level. 7 Marking, packaging, transport and storage 7.1 Marking 7.1.1 Each control valve shall have a nameplate in a prominent place. Nameplate should be clearly marked on the product name, model, the main performance parameters, manufacturing date and factory name; control valve working fluid inlet and outlet should be marked accordingly, and instructions in the product instructions. 7.1.2 Transport packaging Storage and delivery and receipt of goods should be consistent with the provisions of GB191 and GB / T6388. 7.2 Packaging 7.2.1 After the control valve inspection, should drain the working fluid within the valve. The working fluid inlet and outlet should be applied plastic plug tight, plastic plug specifications in line with this standard Appendix B (tips appendix) requirements. 7.2.2 The box should be equipped with a number of wearing parts and special tools. 7.2.3 The following documents should be attached to the packing box: - packing list; - product certification; - product instruction manual. 7.3 Transport 7.3.1 Product packaging should meet the relevant requirements of the transport sector. 7.3.2 products in the transport process to prevent rain. 7.4 Storage Products should be stored in well-ventilated, non-corrosive gases in the warehouse.
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