1. FLANGE FACING 法兰面 

RF：Raised face

RTJ-RJ：Ring type joint

FF：Flat face

2 FITTINGS 管件

TLE：Threaded large end (swage nipple)

TSE：Threaded small end (swage nipple)

TBE：Threaded both end (nipples)

ISS：Integral steel seat (unions)

SET：Threaded small end (swage nipple)

TOE：Threaded one end (nipples)

LEB：Bevel large end (swage nipple)

LET：Threaded large end (swage nipple)

SEP：Plain small end (swage nipple)

NF：Nipoflange

3 CONNECTIONS 接头形式

BW：Butt-weld

SW：Socket weld

FLGD：Flanged

WN：Welding neck

THDD/TH：Threaded

SCRD：Screwed

SWTH：Socket weld X THDD Female

PE：Socket weld (NIPPLED)

PETH：Socket Weld (NIPPLED) x THDD Female

4 WALL THICKNESS 壁厚

SCH：Schedule in acc. with ASME/ANSI B36.10 or B36.19

STD：Standard Weight (equals Sch. 40 up to 10)

XS：Extra heavy weight (equals Sch. 80 up to 8")

XXS：Double extra heavy weight

5 VALVE DESCRIPTIONS 阀门描述

OS & Y：Outside screw & Yoke

IS：Inside screw

RS：Rising stem

NRS：Non-rising stem

UB：Union bonnet

BB：Bolted bonnet

UC：Union cap

SC：Screwed cap

BC：Bolted cap

ES：Extension stem

RB：Reduced Bore

FB：Full Bore

WB：Welded bonnet

GO：Gear operated