check valve and gate valve safety valve Butterfly valve
The valve is used to open and close the pipeline, control the flow direction, adjust and control the parameters (temperature, pressure and flow) of the transmission medium. According to its function, it can be divided into shut-off valve, check valve, reg
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Description
What are Valves?
Valves are mechanical devices that controls the flow and pressure within a system or process. They are essential components of a piping system that conveys liquids, gases, vapors, slurries etc..
Different types of valves are available: gate, globe, plug, ball, butterfly, check, diaphragm, pinch, pressure relief, control valves etc. Each of these types has a number of models, each with different features and functional capabilities. Some valves are self-operated while others manually or with an actuator or pneumatic or hydraulic is operated.
Class Ratings
Pressure-temperature ratings of valves are designated by class numbers. ASME B16.34, Valves-Flanged, Threaded, and Welding End is one of the most widely used valve standards. It defines three types of classes: standard, special, and limited. ASME B16.34 covers Class 150, 300, 400, 600, 900, 1500, 2500, and 4500 valves.
ASTM Casting Materials
| Material | ASTM Casting SPEC |
Service |
| Carbon Steel | ASTM A216 Grade WCB |
Non-corrosive applications including water, oil and gases at temperatures between -20°F (-30°C) and +800°F (+425°C) |
| Low Temp Carbon Steel |
ASTM A352 Grade LCB |
Low temperature applications to -50°F (-46°C). Not for use above +650°F (+340°C). |
| Low Temp Carbon Steel |
ASTM A352 Grade LC1 |
Low temperature applications to -75°F (-59°C). Not for use above +650°F (+340°C). |
| Low Temp Carbon Steel |
ASTM A352 Grade LC2 |
Low temperature applications to -100°F (-73°C). Not for use above +650°F (+340°C). |
| 3½% Nickel Steel |
ASTM A352 Grade LC3 |
Low temperature applications to -150°F (-101°C). Not for use above +650°F (+340°C). |
| 1¼% Chrome 1/2% Moly Steel |
ASTM A217 Grade WC6 |
Non-corrosive applications including water, oil and gases at temperatures between -20°F (-30°C) and +1100°F (+593°C). |
| 2¼% Chrome | ASTM A217 Grade C9 |
Non-corrosive applications including water, oil and gases at temperatures between -20°F (-30°C) and +1100°F (+593°C). |
| 5% Chrome 1/2% Moly |
ASTM A217 Grade C5 |
Mild corrosive or erosive applications as well as non-corrosive applications at temperatures between -20°F (-30°C) and +1200°F (+649°C). |
| 9% Chrome 1% Moly |
ASTM A217 Grade C12 |
Mild corrosive or erosive applications as well as non-corrosive applications at temperatures between -20°F (-30°C) and +1200°F (+649°C). |
| 12% Chrome Steel |
ASTM A487 Grade CA6NM |
Corrosive application at temperatures between -20°F (-30°C) and +900°F (+482°C). |
| 12% Chrome | ASTM A217 Grade CA15 |
Corrosive application at temperatures up to +1300°F (+704°C) |
| 316SS | ASTM A351 Grade CF8M |
Corrosive or either extremely low or high temperature non-corrosive services between -450°F (-268°C) and +1200°F (+649°C). Above +800°F (+425°C) specify carbon content of 0.04% or greater. |
| 347SS | ASTM 351 Grade CF8C |
Primarily for high temperature, corrosive applications between -450°F (-268°C) and +1200°F (+649°C). Above +1000°F (+540°C) specify carbon content of 0.04% or greater. |
| 304SS | ASTM A351 Grade CF8 |
Corrosive or extremely high temperatures non-corrosive services between -450°F (-268°C) and +1200°F (+649°C). Above +800°F (+425°C) specify carbon content of 0.04% or greater. |
| 304L SS | ASTM A351 Grade CF3 |
Corrosive or non-corrosive services to +800F (+425°C). |
| 316L SS | ASTM A351 Grade CF3M |
Corrosive or non-corrosive services to +800F (+425°C). |
| Alloy-20 | ASTM A351 Grade CN7M |
Good resistance to hot sulfuric acid to +800F (+425°C). |
| Monel | ASTM 743 Grade M3-35-1 |
Weldable grade. Good resistance to corrosion by all common organic acids and salt water. Also highly resistant to most alkaline solutions to +750°F (+400°C). |
| Hastelloy B | ASTM A743 Grade N-12M |
Is well suited for handling hydrofluoric acid at all concentrations and temperatures. Good resistance to sulphuric and phosphoric acids to +1200°F (+649°C). |
| Hastelloy C | ASTM A743 Grade CW-12M |
Good resistance to span oxidation conditions. Good properties at high temperatures. Good resistance to sulphuric and phosphoric acids to +1200°F (+649°C). |
| Inconel | ASTM A743 Grade CY-40 |
Very good for high temperature service. Good resistance to spanly corrosive media and atmosphere to +800°F (+425°C). |
| Bronze | ASTM B62 | Water, oil or gas: up to 400°F. Excellent for brine and seawater service. |
| Material | ASTM Casting SPEC |
Service |
