The technical requirements for needle valves under special circumstances are as follows: 2. malleable iron needle valve for nominal pressure PN ≤ 2.5MPa, malleable iron valves temperature water, steam, air and oil, etc. -30 ~ 300 ℃ medium, the main component material selected according to Table 2. 3. spheroidal graphite cast iron for the needle valve nominal pressure pN≤4.0MPa, spheroidal graphite cast iron valve temperature water, steam, air and oil, etc. -30 ~ 350 ℃ medium, the main component material selected according to Table 3. 4. The copper alloy used for the valve needle nominal pN≤2.5MPa water, sea water, oxygen, air, oil and other media, and a temperature of -40 ~ 250 ℃ valve copper alloy vapor medium, the main parts The materials are selected according to Table 4. The carbon steel for the needle valve nominal pressure pN≤32.0MPa, carbon steel valves temperature water, steam, air, hydrogen, ammonia, nitrogen and petroleum products medium of -30 ~ 450 ℃, The main parts and materials are selected according to Table 5. 6. The high-temperature steel for the needle valve nominal pressure pN≤16.0MPa, and the vapor temperature is less than or equal to the high temperature petroleum products medium 550 ℃ steel valves, the main component material selected according to Table 6. 7. The low-temperature steel for the needle valve nominal pressure pN≤6.4MPa, a temperature higher than or equal to a low temperature steel valves ethylene, propylene, natural gas and liquid media such as liquid nitrogen, -196 ℃, the main component material in Table 7 Use. 8. acid resistant stainless steel needle valves for nominal pN≤6.4MPa, temperature of less than or equal to stainless steel valves medium nitric acid, acetic acid, etc. 200 ℃, the main component material selected according to Table 8.
5XZ series Gravity Separator (Air blowing type)
Introduction:
1. This Blow Type Specific Gravity Cleaning Machine is to produce
proportion segregation phenomenon under stress of aerodynamic and vibration
friction of graininess material.
2. By adjusting wind pressure, amplitude and other parameters, larger
proportion material will sink down and move bottom to up under stress of
vibration friction; smaller proportion material moves up to bottom.
3. This machine is to remove blighted seed, budding seed, damaged seed
(by insect), rotten seed, deteriorated seed, moldy seed, non-viable seed, seed
with black powder sick and light impurities from wheat, corn, paddy, sunflower
seed, melon seed, legume, etc.
4. At the same time, there is an angle on the right of vibration
surface; the stone can be separated.
This machine is according to segregation phenomenon of granule and
density under fluidization process, for achieve materials delaminating and
mutual exchange, at the same time the wind pressure and amplitude need be
adjusted. Specific Gravity Separator is used to classify materials according to
density or specific gravity. This is important when seed and/or impurities are
similar in size but different in density. The separator uses a vibrating
perforated deck that can be tilted in two directions at various pitches. Air
moving through the perforated deck separates the seed and any impurities by
weight as the deck oscillates.
Air Blowing Type Gravity Separator Air Blowing Type Gravity Separator,Gravity Separator Machine,Grain Sorting Machine,Small Destoner Machine SHIJIAZHUANG SYNMEC INTERNATIONAL TRADING LIMITED , https://www.seedgraincleaner.com
1. Gray cast iron nominal pressure for the valve needle pN≤1.0MPa, gray cast iron valve temperature water, steam, air, gas and oil, etc. -10 ~ 200 ℃ medium, the main component material in Table 1 Use. 
Needle type valve material selection
In general, a needle valve according to the standard material should be selected according to its performance parameters and materials and products should meet the relevant standards. Other materials with performance not lower than those specified in this standard or agreed upon by the parties to the purchase may also be used.