Picture 2 and 3 show the packing of elbow valves of same specification similar to the one shown in Picture 1.
My queries are:
1. What do 3/8 IPS, 3/8 OD, 3/8 F and 3/8 M represent, and which part of the valve they are referring to?
2. What do the expressions 3/8 IPS x 3/8 OD and 3/8F x 3/8M mean?
Sorry, I failed to upload picture by entering URL, please click link to see picture.
http://i1308.photobucket.com/albums/s604/bigb64/valve_zpsodp5cniw.jpg
http://i1308.photobucket.com/albums/s604/bigb64/IMG_0762_zpsuxxbwyqn.jpg
ips= iron pipe size
OD= outside diameter
ID= inside diameter
mip= male iron pipe size
fip= female iron pipe size
Plumbing Terms and Definitions
Ball Valve - A valve that uses a ball to seal against the seat.
Brass Fittings - A plumbing fitting made of brass. View List
CO - Cleanout
Cock - A faucet or valve for regulating the flow of water.
Copper Fitting - A plumbing fitting made of copper. View List
Coupling - Vent pipe hood, which protects it from the elements.
DWV - Drainage, waste, and vent systems, which remove wastewater. Not for drinking water.
FIP - Female Iron Pipe connection. Standard internal threads on pipe fittings.
Galvanized Fittings - A plumbing fitting made of galvanized metal. View List
IPS (Iron Pipe Size) (OD) - Same as NPS. Standard pipe threads. Also Internal Pipe Swivel connection (female)
OD - Outside diameter View Nominal to OD Equivalence
MIP - Male Iron Pipe Connection. Standard external threads on pipe and fittings.
Nipple (Pipe Nipple) - A short length of pipe installed between couplings or other fittings
Nominal - Usually refers to the Inside diameter of trade sizes of copper pipe and some CPVC pipes. Not for Iron Pipe connections. For example, a " NOM Comp. Fitting is actually 5/8" because " pipe has an OD of 5/8".
View Nominal to OD Equivalence
NPS - National Pipe Straight threads standard, Same as IPS
PEX - Cross-linked polyethylene. PEX tubing is commonly used for hydronic radiant floor heat, but increasingly also used for water supply lines. Stronger than PE.
Plumbing Fitting - The component in a plumbing system that connects two or more pieces of pipe together.
PVC - Polyvinyl Chloride. A plastic plumbing material used primarily for yard service pipe, outdoor irrigation systems or interior drain, waste and vent systems. This material is typically white or black.
Reducing - A fitting that connects pipes of different sizes together.
Sillcock - Hose bib
Union - Three piece fitting that joins two sections of pipe, but allows them to be disconnected without cutting the pipe. Used primarily with steel pipe; never in a DWV system.
Valve - A device used for turning the water supply on and off. Often referred to as "stops."
http://www.plumbingfittingsdirect.com/definitions.html
