Corrosion resistant pressure pneumatic valve material analysis

a, pneumatic valve, pneumatic valve plate

pneumatic valve, pneumatic valve plate ( Pneumatic disc) Is one of the main parts, pneumatic valve directly under medium pressure, the material must comply with the 'pneumatic valve's pressure and temperature rating'. Commonly used materials have the following:

and gray cast iron, gray cast iron is suitable for the nominal pressure PN or less. MPa, the temperature was minus ℃ ~ ℃ water, steam, air, gas, oil medium, etc. Gray cast iron used brands are: HT, HT, HT, HT.

and malleable iron: applicable to the nominal pressure PN or less. MPa, the temperature was minus ~ ℃ water, steam, air and oil medium, commonly used brands are: KTH - k - k - 。 'Z. x& Equity raisings U

and nodular cast iron: suitable for PN or less. MPa, the temperature was minus ~ ℃ water, steam, air, oil medium, etc. Commonly used brands are: QT - QT - QT - 。

in view of the current domestic technology level, GeChang is uneven, the user is often difficult to test again. According to the experience, it is suggested that the PN or less. MPa, pneumatic valve or adopt steel pneumatic valve for safety.

, acid of high silicon ductile iron: applicable to the nominal pressure PN or less. MPa, corrosion medium temperature is lower than ℃.

and carbon steel: applicable to the nominal pressure PN or less. MPa, the temperature was minus ~ ℃ water, steam, air, hydrogen, ammonia, nitrogen and oil products such as medium. Commonly used brand with WC, WCB, mid-december and high-quality steel, Mn, and the low alloy structural steel.

, copper alloy, is suitable for the PN or less. MPa water, sea water, oxygen, air, oil products, such as medium, and temperature ~ ℃ steam medium, commonly used brand for ZGnSnZn ( Tin bronze) H, Hpb - （ Brass) 、QAZ- 、QA- ( Aluminum bronze.

and high temperature copper: applicable to the nominal pressure PN or less. MPA, temperature ℃ or less of the steam and oil products. Commonly used brand ZGCrMo, CrMo ZGCrMoV, ZGGrMoV, CrMoV, WC, WC, etc. Specific use must, in accordance with pneumatic valve pressure and temperature of the norms.

, low temperature steel, applicable to the nominal pressure PN or less. Mpa, temperature - or more ℃ ethylene, propylene, liquefied natural gas, liquid nitrogen medium, such as common brand ZGCrNi, CrNi, CrNiTi, ZGCrNi.

, acid-proof stainless steel, is suitable for the nominal pressure PN or less. Mpa, temperature ℃ or less nitric acid, acetic acid medium, such as commonly used brand ZGCrNiTi, ZGCrNi ( Nitric acid resistant) ，ZGCrNiMoTi、ZGCrNiMoTi（ Acid and urea)

2, pneumatic valve stem

pneumatic valve rod in the process of pneumatic valve opening and closing, pull, pressure and under torsional force, and direct contact with the media, and packing friction and relative movement between at the same time, so the pneumatic valve stem material must ensure that the specified temperatures have sufficient strength and impact toughness, has certain corrosion resistance and abrasion resistance, and good manufacturability. There are several commonly used pneumatic valve rod materials.

, carbon steel,

for low and medium temperature not to exceed ℃ water, steam medium, generally choose A ordinary carbon steel.

used for medium and medium temperature not to exceed ℃ water, steam, generally choose quality carbon steel.

, alloy steel,

used for medium and high pressure, medium temperature not to exceed ℃ medium such as water, steam, oil, generally choose Cr ( Chrome steel) 。 _ / designed. the GN used in high pressure, medium temperature does not exceed ℃ the medium such as water, steam, can choose CrMoALA nitriding steel.

used in high pressure, medium temperature not to exceed ℃ steam medium, generally choose molybdenum CrMoVA chrome vanadium steel.

, acid-proof stainless steel

used in medium and high pressure, medium temperature does not exceed ℃ of corrosive medium and weak corrosive medium, Cr, Cr, Cr optional chrome.

and stainless steel

when used in corrosive medium, can choose CrNi, CrNiTi, CrNiMoTi, CrNiMoTi stainless acid-resistant steel and PH - Mo precipitation hardened steel.

, heat-resistant steel

used in medium temperature not to exceed ℃ high temperature pneumatic valves, can choose CrSiMo markov body heat resistant steel and CrNiWMo austenite heat resistant steel.