Valves Shell material

Besides it's standard material ASTM A216 (WCB), DAV cast steel valves are optionally available with the materials listed below :

Working Temperature ℉(℃)	Standard of Materials
	Material Designation	ASTM Spec.	JIS
Over 23 (-5) up to 800 (427)	Corbon Steel	A216 WCB	SCPH 2
850 (454)	C - ½ Mo	A217 WC1	SCPH 11
*1100 (593)	1 ¼ Cr - ½ Mo	A217 WC6	SCPH 21
	2 ¼ Cr - 1 Mo	A217 WC9	SCPH 32
*1200 (650)	5 Cr - ½ Mo	A217 C5	SCPH 61
	9 Cr - 1 Mo	A217 C12
Down to -50 (-46)	Carbon Steel	A352 LCB	SCPL1
	Carbon Steel	A352 LCC
- 75 (- 59)	C - ½ Mo	A352 LC1	SCPL 11
- 100 (- 73)	2 ½ Ni	A352 LC2	SCPL 21
- 150 (- 101)	3 ½ Ni	A352 LC3	SCPL 31
*Over -320 (-196) up to 1500 (815)	18 Cr - 8 Ni (Co 0.03)	A351 LC3	SCS 19
	18 Cr - 8 Ni (Co 0.08)	A351 CF8	SCS13
	18 Cr - 8 Ni - 2 Mo(Co 0.03)	A351 CF3M	SCS16
	18 Cr - 8 Ni - 2 Mo(Co 0.08)	A351 CF8M	SCS 14
	18 Cr - 10 Ni - Cb	A351 CF8C
300 (149)	19 Cr - 29 Ni	A351 CN7M

- For welding ended valves only end ratings terminate at 1000℉

- Refer to ASME/ANSI B16.34 for details of A216,A217, A351 and A352.

  Pressure-Temperatureratings.

  The minimum working temperatres of ASTM A352 are based on ASME B31.3.

Valves trim material

Valve trim

The trim is comprised of the following :

DESCRIPTION	Gate. Valve	Globe Valve	Check Valve
Body seat surface	○	○	○
Disc seat surface	○	○	◎
Stem(Hinge Pin)	○	○	-
Bonnet bush(Baclseat)	○	○	-
Others	Small internal parts	Small internal parts	Small internal parts
Specified by	API 600/BS 1414	BS 1873	BS 1868

Trim material

Following trims specified in API 600, Table 3, are available from DAV either as our standard or at your option.

Trim No. Symbol	Nominal trim	Body Seat surface	Disc Seat surface	Stem(hinge pin) and bonnet bush
01	F6	13Cr	13Cr	13Cr
02	304	18Cr - 8Ni	18Cr - 8Ni	18Cr - 8Ni	Available optionally
05	Hardfaced(HF)	Stellite#6	Stellite#6	13Cr
08	F6 & HF	Stellite#6	13Cr	13Cr
09	Monel	Ni- Cu Alloy	Ni- Cu Alloy	Ni- Cu Alloy	Available optionally
10	316	18Cr - 10Ni - 2Mo	18Cr - 10Ni - 2Mo	18Cr - 10Ni - 2Mo
11	Monel & HF	Stellite#6	Ni- Cu Alloy	Ni- Cu Alloy
12	316 & HF	Stellite#6	18Cr - 10Ni - 2Mo	18Cr - 10Ni - 2Mo
13	Alloy20	19Cr - 29Ni	19Cr - 29Ni	19Cr - 29Ni
14	Alloy20 & HF	Stellite#6	19Cr - 29Ni	19Cr - 29Ni

General specificaion and standards

VALVE TYPE		GATE	GLOBE	CHECK
Shell wall thickness		API 600	API 600	API 600
General valve design specifications		BS 1414	BS 1873	BS 1868
Pressure-Temperature ratings		ASME/ANSI B16.34
Face to face or end to end dimensions		ASME B16.10
End flange dimensions Gasket contact facing	Size 2~20", 24"	ASME/ANSI B16.5
	22"	MSS SP - 44
	22" and larger	ASME B16.47 Ser A (MSS SP-44) or B (API 605)
Finishes for contact face of RF		ASME/ANSI B16.5
Buttwelding end dimensions		ASME B16.25
Inside diameter of flanged end minimum		ASME/ANSI B16.34
Bolt and nut, thread		ASME/ANSI B1.1, B18.2.1, B18.2.2
Material of shell, trim, bolt, nut, and others		API 600, ASTM Respective specification
Marking system		MSS SP - 25
Test and Inspecton	Chemical composition analysis	Relevant ASTM
	Mechanical property test	Relevant ASTM/ASTM A370
	Pressure test	API 598, BS 5146 and ASME/ANSI B16.34
	Radiographic inspection	ASME/ANSI B16.34, ASTM E142/E94
	Wet magnetic particle inspection	ASME/ANSI B16.34, ASTM E709/A275
	Liquid penetrant inspection	ASME/ANSI B16.34, ASTM E165
	Low temperature impact test	ASTM A352/E23
	Dimensional inspection	Relevant valve standards
	Visual inspection	MSS SP - 55

Nace valves

For servicing sour gases or other Hydrogen Sulfide bearing hydrocarbon fluids, DAV offers NACE valves made of
component material specially heat-treatment and hardness controlled in conformity with NACE MR-01-75 standard.

Typical NACE material configuration is shown below for DAV cast carbon steel gate valves.
A note should be taken on the fact that NACE hardness requirment conflicts with the one of valve seating surface specified by API600,
Table 3. DAV NACE valves are available only at your option.

VALVE PARTS	ASTM SPECIFICATION	NACE HARDNESS	API 600 HARDNESS
Body / bonnet	A216 WCB	Max. HRC 22 HB 237	ㅡ
Disc	A216 WCB or AISI Type 410		ㅡ
Disc seat surface	13Cr deposit or AISI Type 410		Min. 300 HB
Body seat ring	A105 or AISI Type 410		ㅡ
Body seat ring surface	Hardface	ㅡ	ㅡ
Stem	AISI Type 410	Max. HRC 22 HB 237	200~275 HB
Bonnet bush			Min. 250 HB
Packing gland			ㅡ
Lantern ring			ㅡ
Bonnent bolts	A193 B7	ㅡ	ㅡ
	A193 B7M	Max. HRC 22 (HB 237)	ㅡ
Bonnet nuts	A194 2H	ㅡ	ㅡ
	A194 2M	Max. HRC 22 (HB 237)	ㅡ