活塞式减压阀，体积小、便于调节、使用较广，但灵敏度较薄膜式低，制造工艺要求
高。适用于空气、水、蒸汽等介质。特别是当介质温度较高时，大量选用活塞式减压阀。
薄膜式减压阀，敏感度较高，但薄膜易损坏，且使用温度受到限制，常用在水、空气等
温度与压力不高的场合.
波纹管式减压阀，敏感度较高与薄膜式相比不容易损坏，但制造工艺复杂、成本高.
气泡式减压阀，结构简单，灵敏度较高，但长时间使用影响阀后压力稳定。
1.4阀门基本参数
为了设计、制造及安装、使用、检（维）修方便，对阀门人为规定一些参数，比如公称
直径、公称压力、温度等，便于互换使用。本公司专业生产卫生级人孔，不锈钢人孔， 凡是具有相同的公称直径与公称压力的管子与管件，就可以相互匹配或互换使用。
1.4.1公称直径
公称直径（也称公称通径）是为设计、制造、安装和检修方便，而人为规定的一种标准
直径。对于钢管，其公称直径的数值，既不是管子外径，也不是内径，而是与之相近的整
数。公称通径的标记由字母“DN”后跟一个毫米表示的数值组成，例如:公称通径为
50mm的管道元件，标记为DN50。在通常情况下，阀门的公称直径与阀门的实际通径是一
致的，但在石油、化工高压工况下的锻造阀门存在着公称通径与实际通径不太一致的现象.
公称通径的系列按GB/T 1047《管道元件的公称通径》规定如表1-2所示。卫生级人孔，卫生级隔膜阀，
衰1-2公称通径系列DN
/mm
 

英文产品介绍

Piston valve, small size, easy to adjust, use a wider, but the sensitivity compared to the thin film manufacturing process requirementsHigh. Apply to air, water, steam and other media. When the medium temperature is high, a large selection of the piston valve.    Membrane valve, higher sensitivity, but the films are easily damaged and the temperature is restricted, commonly used in water, air, etc.High temperature and pressure applications.    Bellows valve, compared to more sensitive and thin film is not easy to damage, but the manufacturing process complexity and high cost.    Bubble pressure reducing valve, a simple structure, high sensitivity, but long-term impact valve, the pressure is stable.1.4 valve basic parameters    In order to design, manufacture and installation, use, inspection （Victoria） to facilitate repair artificial valve, a number of parameters, such as nominalDiameter, nominal pressure, temperature, easy to be used interchangeably. The company specializes in the production of sanitary grade manhole, stainless steel manhole, those who have the same nominal diameter and nominal pressure of tube and pipe fittings, you can match each other or used interchangeably.1.4.1 The public said diameter    Nominal diameter （also known as the nominal diameter） for the design, manufacture, installation and maintenance convenience, arbitrarily defined as a standardDiameter. For steel pipe, its nominal diameter value, neither is the tube outside diameter, nor is the inside diameter, but with similar wholeNumber. Nominal diameter, marked by the values ??represented by the letters "DN" followed by a mm, such as: nominal diameter50mm piping components, marked as DN50. Under normal circumstances, the valve nominal diameter valve path is aConsistent, but the existence of high-pressure conditions in the petroleum, chemical forging valve nominal diameter and the actual path is not consistent phenomenon.    Nominal diameter of the series according to the provisions of GB / T 1047 "piping components nominal diameter," as shown in Table 1-2.Decline 1-2 nominal diameter range DN。

咨询：不锈钢隔膜阀，不锈钢安全卡箍，不锈钢离心泵等卫生级流体设备，：；；