Combination ball valves can be customized
Valves with bellows material basic requirements
by：AIRWOLF
2021-01-15
Must be suitable for the production of corrugated pipe material has good plasticity and high elastic limit, tensile strength and fatigue strength, good welding performance, stability of elastic properties.
Austenitic stainless steel for with these performance characteristics, widely used in the manufacture of bellows.
high voltage
pressure is the basic requirement of the valve and the bellows, but with the increase of valve pressure rating, corrugated pipe wall thickness and stiffness increased, to open valve and corrugated pipe manufacturing is more difficult. Corrugated pipe production factory is generally not simply increase the wall thickness, but by adding layer method to improve the product resistance to pressure, at the same time reduces the axial stiffness of the bellows, reducing valve opens. Nominal pressure 15 mpa ( 900 lb) The following range of austenitic stainless steel corrugated pipe wall thickness is commonly 0. 1 to 0. 3 mm, number 1 ~ 6 layers. The stress level of corrugated pipe has a certain generality, has formed a series of products. When the stress reaches 25 mpa ( 1500lb) According to above valve diameter and working temperature, choosing the appropriate material manufactured by the specialized manufacturer of corrugated pipe design.
anti-corrosive
nonmetallic material excellent corrosion resistance, fluorine plastic anticorrosive valve widely used, ptfe bellows valves have some application field. But for nonmetallic material strength and heat resistance are low, generally use the temperature does not exceed 150 ℃, application scope is limited. By 304, 316 l austenitic stainless steel can handle corrosive weaker condition, but in the fight against chlor-alkail industry such as wet chlorine corrosion and other harsh corrosive conditions, must adopt excellent corrosion resistance of the corrosion resistance of alloy material. Corrosion resistant alloy's resistance to pitting and crevice corrosion ability common point corrosion equivalent ( 前) Value representation, PRE value according to the type ( 1) Calculation.
= % Cr + 3。 3×%莫+ 16×% N ( 1)
the higher the value of PRE, critical crevice corrosion temperature of the alloy, 有条件现金转移支付) And the critical pitting temperature ( CPT) The higher. From table 1 can see, several corrosion resistant alloy PRE value from 304 and 316 l PRE value is much higher.
high voltage
pressure is the basic requirement of the valve and the bellows, but with the increase of valve pressure rating, corrugated pipe wall thickness and stiffness increased, to open valve and corrugated pipe manufacturing is more difficult. Corrugated pipe production factory is generally not simply increase the wall thickness, but by adding layer method to improve the product resistance to pressure, at the same time reduces the axial stiffness of the bellows, reducing valve opens. Nominal pressure 15 mpa ( 900 lb) The following range of austenitic stainless steel corrugated pipe wall thickness is commonly 0. 1 to 0. 3 mm, number 1 ~ 6 layers. The stress level of corrugated pipe has a certain generality, has formed a series of products. When the stress reaches 25 mpa ( 1500lb) According to above valve diameter and working temperature, choosing the appropriate material manufactured by the specialized manufacturer of corrugated pipe design.
anti-corrosive
nonmetallic material excellent corrosion resistance, fluorine plastic anticorrosive valve widely used, ptfe bellows valves have some application field. But for nonmetallic material strength and heat resistance are low, generally use the temperature does not exceed 150 ℃, application scope is limited. By 304, 316 l austenitic stainless steel can handle corrosive weaker condition, but in the fight against chlor-alkail industry such as wet chlorine corrosion and other harsh corrosive conditions, must adopt excellent corrosion resistance of the corrosion resistance of alloy material. Corrosion resistant alloy's resistance to pitting and crevice corrosion ability common point corrosion equivalent ( 前) Value representation, PRE value according to the type ( 1) Calculation.
= % Cr + 3。 3×%莫+ 16×% N ( 1)
the higher the value of PRE, critical crevice corrosion temperature of the alloy, 有条件现金转移支付) And the critical pitting temperature ( CPT) The higher. From table 1 can see, several corrosion resistant alloy PRE value from 304 and 316 l PRE value is much higher.
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