Tag Archive for: valve material


Valve material and valve standards-(1)

What material is WCB/LCB/LCC/WC6/WC in the valve?
W, wrought casting; C, Carbon steel; A, B, C indicate the strength value of steel grades from low to high.

lug type butterfly valve-ductile iron

lug type butterfly valve-ductile iron

WCA, WCA, WCC represent carbon steel, ABC represents the strength level, and WCB is commonly used. The corresponding pipe material of WCB should be A106B, and the corresponding forging material should be A105.
WC6 is an alloy steel casting, the corresponding pipe material is about A355 P11, and the forging is A182 F11; there is also WC9, high temperature resistant alloy steel, the corresponding pipe material is about A355 P22, and the corresponding forging is A182 F22.
WC: weldable casting
LCB/LCC (ASTM A352) low temperature carbon steel
ITCS is carbon steel with impact toughness; impact test C=carbon S=steel (A350)
Split body split type, side entry side mounted (referring to the actuator), corresponding to TOP entry top mounted type

Commonly used valve casting and forging carbon steel material table

material country standard material grade name
Casting China GB/T 12229 WCA WCB WCC
ZG205-415 ZG250-485 ZG275-485
UNS J02502 UNS J03002 UNS J02503
Forged China GB/T 12228 GB/T 699 25 25Mn 35 40 A105
USA ASTM A105/A105M A105

Low temperature casting parts material name and temperature range

C C C-Mn C-Mo 2.5Ni Ni-Cr-Mo 3.5Ni 4.5Ni 9Ni Cr-Ni-Mo
J02504 J03303 J02505 J12522 J22500 j42215 j31550 j41500 j31300 j91540
-32 -46 -46 -59 -73 -73 -101 -115 -115 -73

Commonly used valve ASTM Casting and Forged material sheet (ASME B16.5)

ASTM Casting ASTM Forged China name Temp °C suitable medium
Carbon steel
A216 WCB A105 20 -29/427 water,steam,air,petroleum products
Low temp Carbon steel
A352 LCB A350 LF2 16Mn -46/343
A352 LCC A350 LF2 16Mn -46/343
High temp alloy
A217 WC1 A182 F1 20MnMo -29/454 High temp, High pressure medium
A217 WC6 A182 F11 15CrMo -29/552 High temp, High pressure medium
A217 WC9 A182 F22 10Cr2Mo1 -29/593 High temp, High pressure medium
A217 C5 A182 F5 1Cr5Mo -29/650 Corrosive high temperature medium
A217 C12 A182 F9 Cr9Mo1 -29/593 High sulfur oxidizing medium
Martensitic stainless steel
A217 CA15 A182 F6a Cr9Mo1 -29/593 High sulfur oxidizing medium
Austenitic stainless steel(C≤0.08)
A351 CF8 A182 F304 0Cr18Ni9 -196/537 corrosive medium
A351 CF3 A182 F304L -196/425 corrosive medium
A351 CF8M A182 F316 0Cr18Ni12Mo2Ti -196/537 corrosive medium
A351 CF3M A182 F316L -196/425 corrosive medium
low carbon Austenitic stainless steel(C≤0.03)
A351 CF3 A182 F304L 00Cr18Ni10 -0.459016393 corrosive medium
A351 CF3M A182 F316L 00Cr18Ni14Mo2 -196/454 corrosive medium
Special alloy
A351 CN7M B462Gr.NO8020 (ALLOY20) -29/149 Oxidizing medium and various concentrations of sulfuric acid
A494 M-30C (Monel alloy) B4564 Gr.NO4400 -29/482 Hydrofluoric acid, Sea water
Hastelloy H.B H.C Strong corrosive medium such as dilute sulfuric acid

1. Forged valve body material is dense, not easy to have defects, the structure size is not limited by the mold, and the pressure bearing performance is reliable. It is mostly used for high pressure, oxygen working conditions, small diameter or other small batch valve manufacturing, generally at high temperature, Choose forgings under high pressure or low temperature or special medium; castings are generally only suitable for medium and low pressure, and are mostly used for mass production of standardized molded valves.

2. The difference between material A351 CF3M and A182 F316L: the materials corresponding to the two standards are 316 stainless steel. CF3M stands for castings and is often used as valve material. The corresponding forging steel code is A182 F316L. ASTM A216 WCB is a casting, and its forging is A105; the casting of SS304 is A351-CF8, and the forging is A182-F304.

Stainless steel valve material parameters and specific applications

The following are several stainless steel valve material parameters and specific applications:

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

(1) Angle stroke includes ball valve, butterfly valve, plug valve, etc.

(2) Straight stroke includes gate valve, globe valve, angle seat valve, etc.

This classification method is divided according to the principle, function and structure. It is the most commonly used international and domestic classification method. General gate valve, cut-off

Valves, throttle valves, instrument valves, plunger valves, diaphragm valves, plug valves, ball valves, butterfly valves, check valves, pressure relief valves, safety valves, traps, regulators Valves, bottom valves, filters, drain valves, etc.

Because the valve has a wide range of uses, it also plays a great role. For example, in power plants, valves can control the operation of boilers and steam turbines; in petroleum and chemical production, valves also control the normal operation of all production equipment and technological processes. The same is true in other departments. Nevertheless, the comparison of valves with other products is often overlooked. For example: When installing machinery and equipment, people tend to focus on the main machinery and equipment, but ignore the valve. This will reduce the overall production efficiency or stop production, or cause various other accidents. Therefore, serious and responsible work must be carried out on the selection, installation and use of valves.



Electric drive valve is a commonly used drive valve. The drive device of this drive device form is usually called the valve electric device. The characteristics of the valve electric device are as follows: 1) Rapid opening and closing can greatly shorten the time required to open and close the valve; 2) It can greatly reduce the labor intensity of the operator, especially suitable for high-pressure, large-diameter valves; 3) Suitable for installation in locations that cannot be manually operated or difficult to access, easy to achieve remote control, and the installation height is not limited; 4 ) Conducive to the automation of the entire system; 5) Power is easier to obtain than air and liquid sources, and the laying and maintenance of its wires are much simpler than compressed air and hydraulic pipelines.

The disadvantage of the valve electric device is its complex structure, and it is more difficult to use it in wet places. When used in explosive media, explosion-proof measures are required. Valve electric devices can be divided into two categories: Z-type and Q-type according to the type of valve they drive. The output shaft of the Z-type valve electric

ball valve (8)

stainless steel ball valve (8)

device can rotate many times, which is suitable for driving gate valves, stop valves, diaphragm valves, etc.; the output shaft of the Q-type valve electric device can only rotate 90. , Suitable for driving plug valves, ball valves and butterfly valves. According to its protection type, there are ordinary type, explosion-proof type (represented by B), heat-resistant type (represented by R) and three-in-one type (ie outdoor, anti-corrosion, explosion-proof, represented by S).

The valve electric device is generally composed of a transmission mechanism (reducer), a motor, a stroke control mechanism, a torque limit mechanism, a manual-electric switching mechanism, and an opening indicator.

Pneumatic and hydraulic valves:

Pneumatic valves and hydraulics use a certain pressure of air, water or oil as the power source, and use the movement of cylinders (or hydraulic cylinders) and pistons to drive the valves. Generally, the pneumatic air pressure is less than 0.8MPa, and the hydraulic water pressure or The oil pressure is 2.5MPa~25MPa. For example, it is used to drive a diaphragm valve; the rotary gas and liquid drive device is used to drive a ball valve, a butterfly valve or a plug valve. The hydraulic device has a large driving force and is suitable for driving large-diameter valves. If it is used to drive plug valves, ball valves and butterfly valves, the reciprocating motion of the piston must be converted into a rotary motion. In addition to using the piston of a cylinder or a hydraulic cylinder to drive, there is also a pneumatic film drive. Because of its small stroke and driving force, it is mainly used for regulating valves.

Manual valve:

Manual valve is the most basic drive valve. It includes direct drive by handwheel, handle or wrench and drive by transmission mechanism. When the opening torque of the valve is large, it can be driven by gear or worm gear to save effort. Gear transmission is divided into spur gear transmission and bevel gear transmission. Gear transmission reduction ratio is small, suitable for gate valves and globe valves, worm gear transmission reduction ratio is relatively large, suitable for plug valves, ball valves and butterfly valves.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Related news/knowledge:
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