Typical safety valve applications

1). A48y-16c spring full open safety valve is mainly used for steam boiler. The valve cover is made of open type, which is convenient for spring heat dissipation. It is equipped with manual open spanner. When the steam pressure reaches 75% of the open pressure, the spanner can be pulled to check the flexibility and meet the requirements of boiler operation regulations.

这类产品的阀体材料为铸钢，弹簧一般选用 500RVA 耐热弹簧钢丝。阀门的密封面均堆焊不同材质的硬质合金，耐高温，具有抗流体冲蚀的耐磨性。在其阀座外圈有下调节圈．有的还在阀瓣上带有上调节圈，可以调整排放压力和回座压力性能，在公称压力值以下，其开启压力值可按弹簧不同压力级的选用而不同。额定排量系数可达 0.72-0.75。

The valve body of this kind of product is made of cast steel, and the spring is generally made of 500rva heat-resistant spring steel wire. The sealing surfaces of valves are hardfacing of different materials, which are resistant to high temperature and fluid erosion. The outer ring of the valve seat is provided with a down regulating ring, and some are also provided with an up regulating ring on the valve disc, which can adjust the performance of discharge pressure and reseating pressure. Under the nominal pressure, the opening pressure value can be different according to the selection of different pressure levels of the spring. The rated discharge coefficient can reach 0.72-0.75.

2).A47H－16C 型微启式安全阀，主要用于液体介质的压力系统上，如热水锅炉、水容器及管道。阀盖带有扳手。其弹簧压力级划分类似 A48 类型。额定排量系数约为 0 . 14 左右。

2). A47h-16c type micro lift safety valve is mainly used for pressure system of liquid medium, such as hot water boiler, water container and pipeline. The bonnet has a wrench. Its spring pressure level is similar to a48 type. The rated discharge coefficient is about 0.14.

3).A412F－2.5 型内置全启式弹簧安全阀，主要用于液化气体铁路罐车、罐式汽车。阀门安装在罐车顶部，外露高度不大 150 mm 。结构上与传统安全阀不同的是。弹簧位于阀瓣和阀座下方．排气出口垂直朝上。阀瓣带有固定或可调整的反冲盘结构，密封面采用软密封形式。阀座一般带有下调节圈。开启压力为罐体设计压力的 1 .05-1.10 倍，一般0.8-2.31MPa。阀门启闭灵活，排放量大，额定排放压力不大于罐体设计压力的 1 . 2 倍。额定排量系数在 0.6-0.9 之间。

3). A412f-2.5 built in full open spring safety valve is mainly used for liquefied gas railway tank car and tank car. The valve is installed on the top of the tank car, and the exposed height is not more than 150 mm. The structure is different from the traditional safety valve. The spring is located under the disc and seat. The exhaust outlet is vertical upward. The disc has a fixed or adjustable disc structure with a soft sealing surface. The valve seat is generally provided with a down regulating ring. The opening pressure is 1.05-1.10 times of the tank design pressure, generally 0.8-2.31mpa. The valve is flexible in opening and closing, with large discharge capacity, and the rated discharge pressure is not more than 1.2 times of the tank design pressure. The rated discharge coefficient is between 0.6-0.9.

4).A42F-2.5 型外置全启式弹簧安全阀主要用于液化石油气、液氨、液氯等介质固定贮罐、罐车及要求排放量较大的压力容器上，阀门密封采用软密封或硬密封结构，喉管及阀瓣等零部件可采用特殊表面处理，耐介质腐蚀。开启压力为221.7-2.31MPa,额定排量系数0.6-0.9 之间。

4). A42f-2.5 type external full open spring safety valve is mainly used for the fixed storage tank of liquefied petroleum gas, liquid ammonia, liquid chlorine and other media, tank cars and pressure vessels with large discharge requirements. The valve seal adopts soft seal or hard seal structure, and the parts such as the throat and valve disc can adopt special surface treatment, which is resistant to medium corrosion. The opening pressure is 221.7-2.31mpa, and the rated discharge coefficient is 0.6-0.9.

5)A421H-16 型安全阀是一种较小口径弹簧封闭式安全阀，常用在介质为液体的小容器、水管路、酸碱介质管路中。阀体材质有碳钢和不锈钢两种，额定排量系数在 0.07-0.08 之间。

5) a421h-16 safety valve is a small caliber spring closed safety valve, which is commonly used in small containers, water pipelines and acid-base medium pipelines with liquid medium. The valve body is made of carbon steel and stainless steel, and the rated discharge coefficient is between 0.07-0.08.

6)A27W-10T 型安全阀是一种小口径微启式外螺纹安全阀，产品大多采用铜阀瓣，结构简单，无调节圈结构．不能调整回座与排放压力。一般用于水及气体排量少的系统上，排量系数低，主要是阀瓣中导向筋在阀座内孔中滑动，增加阻力，减少了排放面积。

6) a27w-10t safety valve is a small caliber micro opening external thread safety valve. Most of the products are copper valve disc, simple structure, no adjusting ring structure, and can not adjust the reseating and discharge pressure. Generally, it is used in the system with small water and gas displacement and low displacement coefficient. The main reason is that the guide rib in the valve disc slides in the inner hole of the valve seat, increasing the resistance and reducing the discharge area.

7）. A4llF－0.3 型及 A4llX-0.3 型呼吸式安全阀，主要用于重、轻油、乙二醇、 二甲苯．冰醋酸等介质的地面贮罐及罐车。安全阀具有呼出与吸入二个阀瓣，当容器介质超压时· 正常开启、排放，当容器内压低与大气压，出现一定负压时，吸入阀瓣打开．吸入大气。吸人压力为 0.001-0.002MPa ，呼出压力为0.007-0.15Mpa

7). A4llf-0.3 and a4llx-0.3 breathing safety valves are mainly used for ground storage tanks and tank cars of heavy, light oil, glycol, xylene, glacial acetic acid and other media. The safety valve has two valve flaps of exhalation and inhalation. When the container medium is overpressured, it can be opened and discharged normally. When the pressure in the container is low and atmospheric pressure, there is a certain negative pressure, the suction valve flap can be opened and inhaled into the atmosphere. Suction pressure is 0.001-0.002mpa, exhalation pressure is 0.007-0.15mpa

8）. DA21F-2.5T 型超低温安全阀，主要用于液氧、液氮等超低温介质的压力容器，工作温度为一 196－50℃ ，阀门材料为铜或不锈钢。

8). Da21f-2.5t ultra-low temperature safety valve is mainly used for pressure vessels with ultra-low temperature medium such as liquid oxygen and liquid nitrogen. The working temperature is 196-50 ℃, and the valve material is copper or stainless steel.

技术参数范围

Technical parameter range

据有关文献介绍，目前国内外制造安全阀的规格为：公称通径 8－450mm；公称压力 0.15-70MPa ；工作温度一 253-600 ℃ 。

According to relevant documents, the specifications of safety valves manufactured at home and abroad are: nominal diameter 8-450mm; nominal pressure 0.15-70mpa; working temperature 1 253-600 ℃.