How to properly use and install pressure reducing valve

Gas liquefied petroleum gas from high pressure into low pressure work is completed by the pressure reducing valve, in addition to decompression, but also has the function of stabilizing the outlet gas pressure, should pay attention to the use: 1, reducing valve and hose interface to Close connection, preferably tied with wire or clamp with tube clamp. 2, on the pressure reducing valve, you must first check the pressure reducing valve inlet seal is deformed off. 3, pressure reducer and angle valve is connected with the anti-buckle. When using the pressure reducer, hold the valve body with one hand and align the handwheel with the outlet thread of the angle valve. Use the other hand to rotate the handwheel counterclockwise until the pressure reducing valve does not shake left and right. 4, when changing the bottle to remove the pressure reducer, cylinder angle valve must be closed before unloading. 5, after the relief valve is removed, should be gently on the hob or other dry items, do not readily fling the floor, so easy to make pressure reducer damage, but also easy to make the inlet seal off 6 When the pressure reducer fails, you should ask the professional and technical personnel to repair. Do not disassemble yourself.

Gravity Casting Parts

"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.


  • 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.

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