If the double gasket 1mm per piece, and the single layer gasket 2mm, which sealing effect is good? Is there any basis? I remember that the pressure wells in the family used double layer gaskets to solve the problem
Should be in the same preload, the gasket between the compensation of each other, more conducive to liquid sealing.From another angle, the pressure is higher, or the temperature is higher. In this case, with two gaskets, the two pads increase the chance of leakage due to the poor wear of the gasket in harsh conditions.You mentioned home pressure manhole covers use two pieces, because he is mainly used for sealing air and water, the environment and medium simple, while some of the industrial standards of the time limit. I am impressed, the home of the pressure covers also used waste tires, cut the gasket.However, in terms of sealing effect, it is generally not recommended to use both sides of the gasket. The effect of the monolithic shim is superior to that of the double wafer.
Double layer gasket and equal thickness single layer gasket sealing effect which is good and thickness independent, but with gasket material and seal cavity medium, pressure and temperature have a great relationship.The gasket is made of paper, rubber or copper sheet, placed between the two surfaces to strengthen the sealing material and to prevent the leakage of the fluid from the sealing element between the static and closed covers.Gaskets (gasket) are mechanical seals between two bodies, usually used to prevent pressure, corrosion, and natural heat expansion, cold contraction and leakage between two bodies. Because machined surfaces are not perfect, gaskets can be used to fill the irregularity. Gaskets are usually made of sheet materials such as cushion paper, rubber, silicone rubber, metal, cork, felt, neoprene, nitrile rubber, fiberglass or plastic polymers (such as Teflon). Gaskets for specific applications may contain asbestos.A gasket (washer) is a hole (usually in the middle) of a thin plate (usually round), usually used to distribute threads of load fasteners. Other uses are used as spacers, springs (Baer, gasket, wave washer), wear-resistant pads, pre display devices, and locking devices. Rubber gaskets are also used on taps (valves) to cut off flowing liquids or gases. Rubber or silicone gaskets are also available to reduce vibration of the fan. Usually the outer diameter of the gasket is about two times the inside diameter.
Double layer and single layer gasket sealing problem can not generally say who is good, who is not good. This is closely related to the material of the gasket and the medium, pressure and temperature in the sealing chamber.For example, the pressure is atmospheric pressure, the medium is a liquid fluid, the problem is within 200 degrees celsius. Most of the material can accept this temperature, so at this time, generally two pieces of gasket sealing performance better.
