閥門基本參數(shù)和公稱直徑參照表

 活塞式減壓閥，體積小、便于調(diào)節(jié)、使用較廣，但靈敏度較薄膜式低，制造工藝要求
高。適用于空氣、水、蒸汽等介質(zhì)。特別是當(dāng)介質(zhì)溫度較高時，大量選用活塞式減壓閥。
薄膜式減壓閥，敏感度較高，但薄膜易損壞，且使用溫度受到限制，常用在水、空氣等
溫度與壓力不高的場合.
波紋管式減壓閥，敏感度較高與薄膜式相比不容易損壞，但制造工藝復(fù)雜、成本高.
氣泡式減壓閥，結(jié)構(gòu)簡單，靈敏度較高，但長時間使用影響閥后壓力穩(wěn)定。
1.4閥門基本參數(shù)
為了設(shè)計、制造及安裝、使用、檢（維）修方便，對閥門人為規(guī)定一些參數(shù)，比如公稱
直徑、公稱壓力、溫度等，便于互換使用。本公司專業(yè)生產(chǎn)衛(wèi)生級人孔，不銹鋼人孔， 凡是具有相同的公稱直徑與公稱壓力的管子與管件，就可以相互匹配或互換使用。
1.4.1公稱直徑
公稱直徑（也稱公稱通徑）是為設(shè)計、制造、安裝和檢修方便，而人為規(guī)定的一種標(biāo)準(zhǔn)
直徑。對于鋼管，其公稱直徑的數(shù)值，既不是管子外徑，也不是內(nèi)徑，而是與之相近的整
數(shù)。公稱通徑的標(biāo)記由字母“DN”后跟一個毫米表示的數(shù)值組成，例如:公稱通徑為
50mm的管道元件，標(biāo)記為DN50。在通常情況下，閥門的公稱直徑與閥門的實際通徑是一
致的，但在石油、化工高壓工況下的鍛造閥門存在著公稱通徑與實際通徑不太一致的現(xiàn)象.
公稱通徑的系列按GB/T 1047《管道元件的公稱通徑》規(guī)定如表1-2所示。衛(wèi)生級人孔，衛(wèi)生級隔膜閥，
衰1-2公稱通徑系列DN
/mm
 

英文產(chǎn)品介紹

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。

咨詢：不銹鋼隔膜閥，不銹鋼安全卡箍，不銹鋼離心泵等衛(wèi)生級流體設(shè)備，：；；