Automatic spray control valve general technical conditions

"Hydraulic support with automatic spray control valve – General technical conditions Ministry of Coal Industry of the People’s Republic of China, issued on December 30, 1997, and implemented on June 1, 1998. **Scope** This standard outlines the requirements for hydraulic support with automatic spray control valves, including testing methods, inspection rules, labeling, packaging, transportation, and storage. It applies to coal mine hydraulic supports equipped with various types of automatic spray control valves. **Normative References** The following standards are referenced in this document: - GB 191-90: Pictorial marks for packaging and storage - GB/T 6388-86: Marks for receiving and dispatching packaging - GB/T 13264-91: Sampling procedures for non-conforming rates - GB/T 14437-93: Sampling procedures for quality supervision - GB/T 15482-1995: Sampling procedures for small total counts - MT 76-83: Hydraulic support oil emulsion **Definitions** - **Hydraulic support with automatic spray control valve**: A device installed on a hydraulic support, connected to its pipeline, which automatically opens or closes the water spray system during operation. - **Working fluid**: The emulsified oil used under pressure to operate the control valve. - **Opening pressure**: The minimum pressure required to activate the valve, measured in MPa. **Requirements** Control valves must meet all the specifications outlined in this standard and be manufactured according to approved drawings and technical documents. - **Ambient Temperature**: Normal operating conditions range from 4°C to 40°C. - **Appearance**: Surfaces should be smooth, corrosion-resistant, and free from scratches, flaking, or damage. - **Interface**: Inlet and outlet ports must use quick connectors with consistent dimensions and surface finish. - **Strength**: Tested at 1.5 times the rated pressure (32 MPa) without leakage or deformation. - **Resistance Loss**: At 20 L/min flow, pressure drop across the valve should not exceed 0.1 MPa. - **Opening Pressure**: Should not exceed 2 MPa within the range of 1.0–7.0 MPa. - **Water Pressure Test**: Valves must function properly within the 1.0–7.0 MPa range. - **Service Life**: After 4,000 cycles, the seal must remain intact. - **Sealing**: No pressure drop after 2 hours under working fluid pressure. **Test Methods** - **Test System**: As shown in Figure 1. - **Equipment**: Includes pressure gauges, flow meters, stopwatches, spray pumps, working fluid pumps, and other necessary tools. - **Test Conditions**: Water and fluid temperatures, filter accuracy, and nozzle setup must meet specified standards. **Inspection Rules** - **Factory Inspection**: Conducted by the manufacturer, based on batch criteria and sampling plans as per GB/T 13264. - **Type Testing**: Required for new products, after long production pauses, or when significant design changes occur. **Marking, Packaging, Transport, and Storage** - **Labeling**: Each valve must have a clear nameplate with model, performance data, and manufacturing details. - **Packaging**: Must include protective plugs, spare parts, and documentation such as a packing list and user manual. - **Transport**: Packages must be waterproof and comply with transport regulations. - **Storage**: Products should be stored in dry, well-ventilated areas free from corrosive gases." (Word count: 504)

Calcium Nitrate

Packaging &Shipping

1. Used in fertilizer.
2. Used in waste water pre-conditioning.
3. Used in set accelerating concrete admixtures.
4. Used for regenerateable cold packs.

It is mainly used as flocculants in rubber latex and refrigerant, as cement anti-freezer, phosphorizing agent in steel industry. And it is also employed in oil exploratory well and sewage treatment, etc. In agriculture it is used as soiless culture and fast-effective fertilizer for acid soil. It also can be used to make fireworks and incandescent lamp chimney in light industry, to produce explosives in national defense industry and to paint negative pole in electron instrument industry. It is also a raw material in making other nitrates.

Calcium Nitrate,Nitrate Salt Raw Material,Fertilizer Calcium Nitrate Purity,Calcium Salt Calcium Dinitrate

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