阀门facetofacedimension什么意思

Ⅰ 阀门法兰尺寸表中的结构长度是什么意思

国家袭标准 GB/T 21465-2008《阀门 术语》：

2.3.1.1

结构长度 face-to-face dimension，face-to-centre dimension

阀门迸、出口端面之间的距离；进口端面至出口轴线的距离；进口轴线至出口端面的距离。

下图中的L

Ⅱ 阀门翻译

1) Y-Strainer 过滤器 ( Screw End螺旋顶端 ) - Body 主体- Brass / Bronze黄铜
- Bonnet外罩 - Brass黄铜
- Filter滤器 - Stainless Steel不锈钢
- Sealing Washer封口清洗器 - Teflon特氟隆(商标名)
- Internal Dimension内部容积 - 15mm,20mm, 25mm, 32mm,
40mm and 50mm.

Y-Strainer nominal pressure可承受压力 - 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 门阀- Body - Brass
- Ball - Brass
- Seat - Teflon
- Handle 把手- Chrome 黄铅Plated Steel 镀金钢
- Internal Dimension - 15mm, 20mm, 25mm, 32mm, 40mm, 50mm.

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

生词都翻译了 剩下的都是重复的了
翻译的好辛苦阿