The 900 - series German - standard safety valves are over - pressure protection devices widely used in fields such as oil, natural gas, chemical industry, electric power, and urban gas. Their main function is to automatically open and relieve pressure when the pressure in equipment or pipelines exceeds the set value, ensuring that the system pressure remains within a safe range. This protects the normal operation of equipment and pipelines, prevents accidents, and reduces losses.
High Precision and Reliability: The 900 - series German - standard safety valves feature high - precision operation, good repeatability, accurate reseating, and are easy to operate and maintain.
Diversified Design: According to user requirements, functional structures such as soft - sealing, bellows - equipped, and radiator - equipped can be selected to adapt to different working conditions.
Modular Design: The parts are designed modularly, facilitating installation and maintenance.
Multiple Connection Methods: It supports various connection methods such as clamp, ferrule, socket - weld, butt - weld, and flange.
The 900 - series German - standard safety valves include various models such as 901, 902, 911, 912, etc. The main differences lie in the design of the bonnet and top cover (closed or open) and whether they are equipped with a handle. The performance parameters of some models are as follows:
Nominal Pressure: PN16 - PN40.
Valve Body Material: Including cast steel, stainless steel, titanium alloy steel, chrome - molybdenum steel, and other materials to adapt to different working environments.
Operating Temperature: From - 196°C to 650°C, and some products can withstand high temperatures of up to 1200°C.
Nominal Diameter: DN20/32 to DN150/250, suitable for pipeline systems of different scales.
The 900 - series German - standard safety valves are mainly used in the following fields:
Oil and Natural Gas: For over - pressure protection of pipelines and equipment.
Chemical Industry and Electric Power: To ensure the safe operation of chemical equipment and power systems.
Urban Gas: To guarantee the safety during gas transportation and use.
The dimensions of the shape and connection of the 900 - series German - standard safety valves vary according to the model and nominal diameter. For example, for the 901 - type safety valve, when the nominal diameter is DN20/32, the size is D1 = 105mm (PN16), L = 85mm, and H = 270mm.
The 900 - series German - standard safety valves are designed and inspected in accordance with the DIN standard, and the flange standard complies with EN1092, ensuring high - quality products and international versatility.
A spring - loaded full - lift safety valve locks the valve disc or plunger and other seals relying on the elastic pressure of the spring. Once the pressure in the pressure vessel becomes abnormal and the resulting high pressure overcomes the spring pressure of the safety valve, the locking device is pushed open, forming a pressure - relief passage to release the high pressure. According to the different opening heights of the valve disc, it can be divided into full - lift type and micro - lift type. The full - lift type has a large discharge capacity and good resilience, and is suitable for liquid and gas media. The micro - lift type is only suitable for liquid media.
Its function is as follows: When the pressure in the container exceeds a certain value, the valve automatically opens relying on the pressure of the medium itself, quickly discharging a certain amount of the medium. When the pressure in the container drops to the allowable value, the valve automatically closes, keeping the pressure in the container always below the upper limit of the allowable pressure. This automatically prevents possible accidents caused by over - pressure, so the safety valve is also known as the ultimate protection device for pressure vessels.
