FERRIC CHLORIDE ANHYDROUS,IRON(III) CHLORIDE ANHYDROUS,FERRIC TRI CHLORIDE ANHYDROUS TIANJIN LIHE TRADING CO.,LTD , https://www.lihecorp.com
General technical requirements for automatic spray control valves for hydraulic supports
"MT/T 765-1997: Chinese Ministry of Coal Industry Standard for Automatic Spray Control Valves in Hydraulic Supports
1. Scope
This standard outlines the technical requirements, testing procedures, inspection rules, and marking, packaging, transportation, and storage specifications for automatic spray control valves used in coal mine hydraulic supports. It applies to various types of automatic spray control valves installed on such equipment.
2. Normative References
The following standards are referenced and form part of this standard:
- GB 191-90: Pictorial Markings for Packaging and Storage
- GB/T 6388-86: Marks for Receiving and Dispatching Packages
- GB/T 13264-91: Sampling Procedures for Non-Conforming Rates
- GB/T 14437-93: Sampling Procedures for Quality Supervision (Large Volume)
- GB/T 15482-1995: Sampling Procedures for Quality Supervision (Small Volume)
- MT 76-83: Hydraulic Support Emulsion
3. Definitions
3.1 Automatic Spray Control Valve: A device installed on a coal mine hydraulic support that automatically opens or closes the water supply during operation, connected to the hydraulic system.
3.2 Working Fluid: The emulsified oil used under pressure to operate the valve.
3.3 Opening Pressure: The minimum pressure required to activate the valve, measured in MPa.
4. Requirements
Control valves must meet all specifications outlined in this standard and be manufactured according to approved drawings and technical documents.
4.1 Ambient Temperature: Operates within 4°C to 40°C.
4.2 Appearance: Surface should be smooth, free from corrosion, scratches, or deformation. All markings must be clear and secure.
4.3 Interface: Inlet, outlet, and working fluid connections must use quick-connect fittings with specified dimensions and surface finish.
4.4 Strength Test: Withstand 1.5 times rated pressure (32MPa) without leakage or damage.
4.5 Flow Resistance: At 20L/min, pressure drop across the valve must not exceed 0.1MPa.
4.6 Opening Pressure: Should not exceed 2MPa when operating between 1.0MPa and 7.0MPa.
4.7 Operational Reliability: Must function properly under 1.0–7.0MPa water pressure.
4.8 Service Life: After 4000 cycles, the seal must remain intact.
4.9 Sealing Test: No pressure drop observed after 2 hours at rated pressure.
5. Testing Methods
5.1 Test Setup: As shown in Figure 1.
5.2 Equipment: Includes pressure gauges, flow meters, stopwatches, spray pumps, and more.
5.3 Test Conditions: Water and fluid temperatures, filtration, and nozzle setup must follow specific guidelines.
5.4 Test Procedures: Includes resistance, opening pressure, and sealing tests.
6. Inspection Rules
6.1 Two types of inspections: Factory and type tests.
6.2 Factory Inspection: Each batch must pass quality checks before leaving the factory.
6.3 Type Inspection: Conducted under specific conditions, such as new product development or significant design changes.
Sampling methods follow GB/T 13264 and GB/T 14437/15482 based on batch size.
7. Marking, Packaging, Transport, and Storage
7.1 Marking: Each valve must have a clear nameplate with model, performance data, and date.
7.2 Packaging: Include spare parts, tools, and necessary documentation.
7.3 Transport: Ensure protection from rain and comply with transport regulations.
7.4 Storage: Store in dry, non-corrosive environments."
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Ferric chloride anhydrous, also called IRON(III) CHLORIDE ANHYDROUS is an inorganic compound. It is a dark brown solid that is soluble in water and presents a yellow brown solution.