Summary of the settings of pressure relief valve, emergency shut-off valve and emergency opening valve: Pressure relief valve, emergency shut-off valve and emergency opening valve are valves developed and applied in recent years, which are concerned by the construction and fire water supply industry. The question talked about his own views.
Keywords: pressure relief valve, emergency shut-off valve, emergency opening valve, hydraulic control valve, fire protection
1 pressure relief valve
The pressure relief valve is arranged on the outlet pipe of the fire pump, and is normally closed. When the pressure of the fire water supply network exceeds the set value, it is automatically opened to prevent the water supply system from being damaged due to overpressure.
The overpressure of the fire water supply network is mainly due to the following reasons: 1 The flow rate of the pump selected according to the fire design flow rate—the head curve is steep, and the overpressure occurs during the small flow operation (self-test or early fire); Therefore, (such as power outage) stop, the outlet pipe has not taken the corresponding technical measures, stop pumping water hammer caused overpressure.
The relief valve settings should pay attention to the position, caliber selection, pressure setting and corresponding accessory configuration.
1 Pressure relief valve can be located near the fire pump or near the fire water tank. Design Code for Automatic Sprinkler System GBH84-1985 Revised Article 10.3.3 of the draft for review: “Each group of pumps...The outlet pipe shall be provided with a control valve......, if necessary, a pressure relief valve shall be provided.†The approval draft was changed to read: "...if necessary, measures should be taken to control the outlet pressure of the water supply pump." These measures include the pressure relief valve.
When the pressure relief valve is installed on the fire pump outlet pipe, it can be placed before and after the check valve. It is set before the check valve to eliminate the overpressure caused by the small flow operation of the pump, and after the check valve (in the direction of the water flow), it can not only eliminate the overpressure caused by the small flow of the pump, but also eliminate the pump stop. The overpressure caused by the water hammer does not cause any harm or loss even if the fire pump water outlet pipe does not take other measures to eliminate the water hammer of the pump (speed closed check valve, slow closing check valve, buffer tank, etc.).
2 The pressure relief valve has two methods, one is the same diameter as the fire water supply main pipe or the first one, and the other is the pressure relief valve with DN100 or DN150.
More valve consultation in one vertical valve: http://?239.html
It can cut all kinds of metal plates, pipes, and is mainly used for rapid cutting of stainless steel, carbon steel, manganese steel, galvanized sheet, various alloy plates, rare metals, etc.
Widely used in: kitchen appliances, sheet metal chassis cabinets, mechanical equipment, electrical equipment, lighting hardware, advertising signs, auto parts, display equipment, various metal products, sheet metal cutting processing and other industries.
Principle of Fiber Laser Cutting Machine
The fiber Laser Cutting Machine adopts the international advanced fiber laser to output a high-energy density laser beam, and focuses on the surface of the workpiece, so that the area irradiated by the ultra-fine focus spot on the workpiece is instantly melted and vaporized, and the spot illumination is moved by the numerical control mechanical system. Automatic cutting is achieved. It is a high-tech equipment integrating advanced fiber laser technology, numerical control technology and precision mechanical technology.
Fiber laser Cutting Machine features
1. Can blow air to cut various metal sheets;
2. High performance, imported original packaged fiber laser, stable performance and long service life;
3. High speed, from efficiency, the speed of cutting thin plates can reach tens of meters per minute;
4. The laser is maintenance free;
5. The cutting edge has good quality, small deformation, flat appearance and beautiful appearance;
6. Adopting imported guiding transmission mechanism and servo motor, the cutting precision is high;
7. It is free to design all kinds of graphics or text for instant cutting, which is simple, flexible and convenient.
Fiber Laser Cutting Machine
Fiber Laser Cutting Machine,Fiber Laser Cnc Cutting Machine,Commercial Laser Cutting Machine,Ccd Camera Laser Cutting Machine
Buluoer Intelligent Technology Co., Ltd. , http://www.buluoercuttingmachine.com