List of the most common abbreviations and acronyms in the valve and piping industry.

ACS, Attestation de Conformité Sanitaire
AFS, American Foundrymen's Society
AGA, American Gas Association
AISI, American Iron and Steel Institut
ANSI, American National Standards Institute
API, American Petroleum Institute
ASA, American Standard Association
ASME, American Society of Mechanical Engineers
ASTM, American Society for Testing and Materials
AWWA, American Water Works Association

BB, Bolted Bonnet
BC, Bolted Cap
BCD, Bolt Circle Diameter
BCF, Bead and crevice free
BFV, Butterfly valve
BHN, Brinell Hardness Number
BS, British Standard
BSI, British Standards Institution
BSP, British Standard Pipe
BSPP, British Standard Pipe Parallel
BSPT, British Standard Taper Pipe Thread
BV, Ball Valve
BW, Butt Weld
BWE, Butt Weld End

CDA, Copper Development Association
CI, Cast Iron
CSA, Canadian Standards Association
CV, Check Valve
CW, Counter Weight
CWP, Cold Working Pressure
CxC, Cooper to Cooper

DAC, Double Acting Cilynders
DD, Double Disc
DEF, Double Emboitement Mâle
DG, Double Disc Gate
DI, Ductile Iron
DIN, Deutsches Institute fuer Normung
DMV, Distribution main valve
DN, Nominal Diameter
DWV, Drainage, Waste, Vent Fitting

ECV, Emergency Control Valve
ESD, Emergency Shut Down

FE, Flanged End
FF, Flat Face
FIV, Formation Isolation Valves
FLG, Flange
FM, Factory Mutual Laboratories
FOB, Free On Board
FTTG, Fitting
FW, Flexible Wedge

GLP, Liquid Gas of Petroleum
GOST, Gosstandart of Russia
GV, Gate Valve

HB, Brinell Hardness
HBC, Rockwell C Hardness
HF, Hard Faced
HW, Handwheel

IBBM, Iron Body Bronze Mounted
ID, Inside Diameter
IPS, Iron Pipe Size
ISA, Instrument Society of America
ISNRS, Inside Screw Non-Rising Stem
ISO, International Organization for Standardization
ISRS, Inside Screw Rising Stem

JIS, Japanese Industrial Standard

MIV, Main Inlet Valve
MJ, Mechanical Joint
MSS, Manufacturers Standardization Society
MTR, Material Test Report

NC, Normally closed
NEMA, National Electrical Manufacturers Association
NPS, Nominal Pipe Size
NPT, National Pipe Taper (Pipe Thread)
NRS, Non-Rising Stem

OD, Outside Diameter
OS&Y, Outside Screw and Yoke
OWG, Working Pressure: Oil, Water, Gas

QO, Quick opening

PCD, Pitch Circle Diameter
PIV, Post inidicator valve
PN, Nominal Pressure (metric)
P-T, Pressure - Temperature
PRV, Pressure Reducing Valve
PVF, Pipes, Valves and Fittings

Rc, Rockwell "C"
RF, Raised Face
RJ, Ring Type Joint
RS, Rising Stem
RWD, Resilient Wedge Disc

SAC, Simple Acting Cilynder
SB, Screw-In-Bonnet
SB, Silver Brazed
SE, Screwed Ends
SE, Solder End
SG, Solid Gate
SIV, Service isolation valve
SJ, Solder Joint
SOV, Shut Off Valve
SPW, Spiral Wound gasket
SS, Stainless Steel
STD, Standard
SW, Solid Wedge Disc
SWE, Socket Weld End
SWP, Steam Working Pressure

TB, Threaded Bonnet
TE, Threaded End
TC, Threaded Cap
TOR, Tout Ou Rien

UB, Union Bonnet
UC, Union Cap
UL, Underwriter's Laboratories

WV, Water valve
WOG, Working Pressure: Water, Oil, Gas
WSP, Steam Working Pressure
WWP, Water Working Pressure