閥門facetofacedimension什麼意思

Ⅰ 閥門法蘭尺寸表中的結構長度是什麼意思

國家襲標准 GB/T 21465-2008《閥門 術語》：

2.3.1.1

結構長度 face-to-face dimension，face-to-centre dimension

閥門迸、出口端面之間的距離；進口端面至出口軸線的距離；進口軸線至出口端面的距離。

下圖中的L

Ⅱ 閥門翻譯

1) Y-Strainer 過濾器 ( Screw End螺旋頂端 ) - Body 主體- Brass / Bronze黃銅
- Bonnet外罩 - Brass黃銅
- Filter濾器 - Stainless Steel不銹鋼
- Sealing Washer封口清洗器 - Teflon特氟隆(商標名)
- Internal Dimension內部容積 - 15mm,20mm, 25mm, 32mm,
40mm and 50mm.

Y-Strainer nominal pressure可承受壓力 - 200 psi 磅/平方英寸from 20'c to 150'c

2) Gate Valve - Body, Disc, Bonnet, Thrust Sleeve - Brass
- Gland, Pack Nut, Stem, wheel Nut - Brass
- Packing - Teflon
- Hand wheel - Gray Cast Iron
- Name Plate - Aluminium Plate
- Internal Dimension - 15mm, 20mm, 25mm, 32mm, 40mm, 50mm

Gate Valve nominal pressure - 200 psi from 20'c to 170'c

3) Ball Valve 門閥- Body - Brass
- Ball - Brass
- Seat - Teflon
- Handle 把手- Chrome 黃鉛Plated Steel 鍍金鋼
- Internal Dimension - 15mm, 20mm, 25mm, 32mm, 40mm, 50mm.

Ball Valve nominal pressure - 150 psi steam pressure 400 psi cold wofk pressure.

生詞都翻譯了 剩下的都是重復的了
翻譯的好辛苦阿