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Valve is a control component in fluid delivery system with the diversion, closure, adjustment, throttle, prevent backflow, diversion or overflow relief functions. As an important pipeline control components, valves are widely used in petroleum, chemical, metallurgy, power stations, natural gas transportation, urban water supply and various departmentsof national economy.

Nominal dimension (DN)

The following DN value is according to GB/T 1047－2004 standard

DN: Size designation of letters and numbers combination for piping system components. It consists of the letters DN followed by dimensionless integer numbers. This number is directly related to the diameter (unit: mm) of end connector.

Preferred DN values are as follows

DN 6	DN 100	DN 700	DN 2200
DN 8	DN 125	DN 800	DN 2400
DN 10	DN 150	DN 900	DN 2600
DN 15	DN 200	DN 1000	DN 2800
DN 20	DN 250	DN 1100	DN 3000
DN 25	DN 300	DN 1200	DN 3200
DN 32	DN 350	DN 1400	DN 3400
DN 40	DN 400	DN 1500	DN 3600
DN 50	DN 450	DN 1600	DN 3800
DN 65	DN 500	DN 1800	DN 4000
DN 80	DN 600	DN 2000

Nominal pressure (PN)

The following PN value is according to GB/T 1048－2004 standard

PN: Relate to mechanical property and dimensional characteristic of piping system components, identification of letters and numbers combination for reference. It consists of the letters PN followed by dimensionless numbers.

PN values should choose from following series

DIN series	ANSI series
PN2.5	PN20
PN6	PN50
PN10	PN110
PN16	PN150
PN25	PN260
PN40	PN420
PN63
PN100

Remark: Allow to use the other PN values when necessary

The organizing method of valve model

1	2	3	4	5	－	6	7

1、Type code
2、Drive method code
3、Connection type code
4、Design feature code
5、Sealing surface material or lining material code
6、Pressure code or working pressure under operating temperature
7、Valve body material code

Valve type code

Valve type	code	Valve type	code
Safety valve	A	Ball valve	Q
Butterfly valve	D	Steam trap valve	S
Diaphragm valve	G	Regulating valve	T
Check valve	H	Plunger valve	U
Globe valve	J	Plug valve	X
Throttle valve	L	Relief valve	Y
Blowoff valve	P	Gate valve	Z

Code of valve with other function

Second function name	code	Second function name	code
Low temperature type	D	Slowly-closed type	H
Heat preservation type	B	Slagging type	P
Bellows type	W	Sweeping type	C
telescopic flange type	S	Fireproof type	F
V-shape ball type	V	Fast type	Q

With the specific structure of valve angle code

Specific structure name	code	Specific structure name	code
Knife type flat-plate gate valve	D	Water seal type	S
with diversion hole type gate valve	K	without diversion hole type gate valve	W

Drive method code

Drive method	code	Drive method	code
Electro magnetic	0	Bevel gear	5
Electro magnetic - hydraulic	1	Pneumatic	6
motor - hydraulic	2	hydraulic	7
turbine	3	Pneumatic-hydraulic	8
Spur gear	4	Motor driven	9

Remark: 1. Code 1, code 2, code 8 is used in the valve opening and closing time, need to have two kinds of power to operate the valve at the same time.

2. Safety valve, hydraulic valve, water conveyance valve, valve of manual hand wheel directly connected to the valve stem operating structure type, this code omitted said.

3. For the pneumatic or hydraulic: 6K, 7K represent normally open type; 6B, 6B represent normally close type; 6S represent pneumatic hydraulic, 9B represent anti-explosion motor driven

Connection type code

Connection type	code	Connection type	code
internal thread	1	weld	6b
external thread	2	wafer	7
flange	4	clamped	8
Socket weld	6s	sleeve	9

Sealing surface or lining material code

Sealing surface or lining material	code	Sealing surface or lining material code	code
Tin-based bearing alloy （babbitt mental）	B	Nylon plastic	N
enamel	C	Boriding steel	P
Nitrided Steel	D	Lead lining	Q
fluoroplastic	F	austenitic stainless steel	R
ceramic	G	plastic	S
Cr13 series stainless steel	H	Copper alloy	T
Rubber lining	J	rubber	X
Monel metal	M	Hard alloy	Y

Remark: 1. when the seal surface material of seal pair is different, use hard density represent, except the Diaphragm Valves

2. When the valve sealing material is the body material, sealing surface material of valve seat use W represent

Valve body material code

Valve body material	code	Valve body material	code
Carbon steel	C	ductile cast iron	Q
Cr13 series stainless steel	H	0Cr17Ni12Mo2 series stainless steel	R
1Cr5Mo chrome molybdenum steel	I	00Cr17Ni14Mo2 series stainless steel	RL
15CrMo chrome molybdenum steel	H	plastic	S
malleable cast iron	K	Copper and copper alloy	T
aluminum alloy	L	Titanium and titanium alloy	Ti
0Cr18Ni9 series stainless steel	P	chrome molybdenum vanadium steel	V
00Cr19Ni10 series stainless steel	PL	gray iron	Z

The examples of valve type and name organizing method

electric, flange connecting, rising stem wedge double disc, valve seat seal surface material processed directly by valve body, PN1, valve body material is gray iron	Z942W-1 electric wedge double disc gate valve
manual, external thread connecting, floating straight-through, valve seat seal surface material is fluoroplastic, PN40, valve body material is 1Cr18Ni9Ti ball valve	Q21F－40 P external ball valve
pneumatic normally open type, flange connecting, weir structure and lining with rubber, PN6, valve body material is gray iron diaphragm valve	G6K41J－6 pneumatic normally open type rubber lining diaphragm valve
flange connecting, Vertical disc type, valve seat seal surface material is cast copper, valve clack seal surface material is rubber, PN2.5, valve body material is gray iron	D741X-2.5 hydraulic butterfly valve
electic welded connecting, straight-through, valve seat seal surface material is bead weld hard alloy, operating temperature 540℃ operating pressure 17.0MPa, valve body material chrome molybdenum vanadium steel globe valve	J961Y－P54170V electric weld globe valve

Valve material characteristic（according to JB/T 5300－1991standard）

Valve body material	Applicable PN/MPa	Applicable temperature/℃	Applicable medium
Gray iron	≤10	－10～200	water, steam, air, gas, and oil etc.
malleable cast iron	≤25	－30～300	water, steam, air, and oil etc.
ductile cast iron	≤40	－30～350	water, steam, air, and oil etc.
Copper alloy	≤25	－40～250	water, seawater, oxygen, air, and oil etc.
Carbon steel	≤320	－30～450	water, steam, air, hydrogen, ammonia, nitrogen, and oil etc.
High temperature steel	≤16	≤550	steam and petroleum
low temperature steel	≤64	≥－196	ethylene, propylene, liquified natural gas, and liquid nitrogen
stainless acid resistant steel	≤64	≤200	nitric acid, acetic acid