| ： Product name : || High temperature and high pressure main safety valve || ： Product model : || A49H |
| ： Driving method : || Manual, pneumatic, electric || ： Connection form : || Flange |
| ： Structure form : || Pulsed || ： Sealing material : || Cobalt-based chromium-nickel stainless steel overlay welding |
| ： Pressure range : || 4.0MPa || ： Nominal diameter : || DN150-DN250 |
| ： Common materials : || Carbon steel, stainless steel || ： Technical consultation : || 021-31007323 |
是国内著名〖 A49H高温高压主安全阀 〗制造商，也是国内大型【 安全阀 】生产商之一，公司自成立以来始终围绕客户的需求并持续创新，为广大的代理商和企业客户提供〖 A49H高温高压主安全阀 〗解决方案，质量可靠，价格实惠，故畅销全国各地，欢迎新老客户来电，来函，我们将为您提供最优质的服务。 Hushan Valve Manufacturing (Shanghai) Co., Ltd. is a well-known domestic manufacturer of [ A49H high temperature and high pressure main safety valve ] and one of the large domestic [ safety valve ] manufacturers. Agents and corporate customers provide the A49H high-temperature and high-pressure main safety valve solution, which is reliable in quality and affordable, so it sells all over the country. Welcome new and old customers to call us or write us, we will provide you with the best service.
A49H safety valve, boiler safety valve, high temperature and high pressure safety valve
I. Overview of the main safety valve
主安全阀 主要用于电站锅炉、压力容器、减温减压装置上使用，防止压力超过允许最高压力值，保证设备安全运行。 A49H main safety valve is mainly used in power station boilers, pressure vessels, temperature reducing and pressure reducing devices to prevent the pressure from exceeding the maximum allowable pressure value and ensure the safe operation of the equipment.
Second, the principle and characteristics of the main safety valve
When the medium pressure rises to the set pressure, the impulse safety valve opens, the medium enters the piston chamber of the main safety valve from the pulse tube, pushes the piston down, and the valve opens automatically. When the impulse valve is closed, the valve flap closes automatically. The sealing surface is made of cobalt-based chromium-nickel stainless steel, and the valve disc is heat-treated to improve wear resistance and erosion resistance.
Third, the main safety valve installation instructions
、阀门必须垂直安装在设备的最高位置。 1. The valve must be installed vertically in the highest position of the equipment.
、排汽管的最低点应考虑疏水，以免排汽时产生水击。 2. The lowest point of the exhaust pipe should be considered hydrophobic to avoid water hammer during exhaust.
、主安全阀 紧固在支座上，支座承受主安全阀排汽时产生的反座力。 3. The main safety valve is fastened on the support, and the support bears the counter-seat force generated when the main safety valve exhausts steam.
、排汽管应有专门吊架，排汽管重量不得加在主安全阀上，主安全阀与排汽管之间的连接法兰应消除任何的附加预应力。 4. The exhaust pipe shall have a special hanger. The weight of the exhaust pipe shall not be added to the main safety valve, and the connecting flange between the main safety valve and the exhaust pipe shall eliminate any additional prestress.
Fourth, the main safety valve shape connection size