Industrial development, the use of flow meters is increasing, and the types of demand are also increasing, which has prompted the development of flow meters faster and faster. However, rotameters have always had a large market. For example, glass rotor flowmeters and metal tube rotor flowmeters , these two types of rotor flowmeters are very accepted and preferred by users, but there are certain differences between the two flowmeters.

Metal rotameter

The main measuring components of the glass rotameter are a vertically mounted small upper and large tapered glass tube and a float that can be moved up and down. When the fluid passes through the conical glass tube from bottom to top, a pressure difference is generated between the upper and lower sides of the float, and the float rises under the differential pressure. When the rising force, the buoyancy and the viscous lift of the float are equal to the gravity of the float, the float is in equilibrium. Therefore, there is a certain proportional relationship between the fluid flow rate flowing through the glass rotor flowmeter and the rise height of the float, that is, the flow area of ​​the glass rotor flowmeter, and the position height of the float can be used as the flow measurement. It is also important that the glass rotor flowmeter is relatively inexpensive in flow meters.
Metal tube rotameter , in the name of the rotor flow meter, the metal tube rotor flowmeter is suitable for small-caliber and low-flow medium flow measurement within DN200; reliable operation, small maintenance and long service life; High; wide flow ratio 10:1; double line large liquid crystal display, optional on-site instantaneous/accumulated flow display, with single-axis sensitive indication with backlight; non-contact magnetic coupling drive; full metal structure.
So where are the differences? First of all, the pressure is high. The glass tube rotor flowmeter is a glass scale tube. It is fragile during shipment. The working pressure should not be too high during use. The glass rotor flowmeter has different withstand voltage according to different calibers. Between 0.2Mpa and 1.0Mpa.
Scale display: glass tube rotameter, glass tube is transparent, so the scale line is directly calibrated on the glass tube, the position of the float is of course the flow size. Metal tube rotor flowmeter because the measuring tube is made of stainless steel.
Application: Glass rotor flowmeter is mainly used in chemical, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dye, environmental protection and scientific research to measure single-phase non-pulsating (liquid or gas) fluid. flow. Anti-corrosion type glass rotor flowmeter is mainly used for the detection of corrosive liquids and gas medium flow, such as strong acid, strong alkali, oxidant, strong oxidizing acid, organic solvent and other flow detection with corrosive gas or liquid medium.
Metal tube rotor flowmeter is suitable for high temperature, high pressure and strong corrosive medium; it can be used in flammable and explosive dangerous places; optional two-wire system, battery, AC power supply mode; multi-parameter calibration function; with data recovery, data backup and Power-down protection.
Another point is that the glass rotor flowmeter does not have a signal output, but the metal tube rotor flowmeter is different, can be with a remote signal output, 4-20mA, can be connected to the PCL system to set the alarm function.
The specific flowmeter selection should be selected from the performance and function of the flowmeter. Choosing the right flow meter for different needs is the right choice for Zui.

"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."

Gravity Die Casting

Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.

The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.

GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.

There are three key stages in the process.

  1. The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
  2. Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
  3. Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.

Advantages

  • Good dimensional accuracy
  • Smoother cast surface finish than sand casting
  • Improved mechanical properties compared to sand casting
  • Thinner walls can be cast compared to sand casting
  • Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
  • Steel pins and inserts can be cast in to the part
  • Faster production times compared to other processes.
  • Once the tolling is proven, the product quality is very repeatable.
  • Outsourced Tooling setup costs can be lower than sand casting.

Gravity Casting Parts

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