SEAL SELECTION GUIDE

Load and Spring back

The selection of probably the most suitable seal for severe carrier conditions is commonly a smooth trade off between load and spring back of the seal. The compression load or seating load has a right away relation with the obtainable tightness where because the spring back of the seal determines how good this tightness is maintained with various temperatures and pressures. For a given seal pass part and seal form it's as a rule genuine that with highest load the spring back is lowest. And of direction that seal with minimum load will generate the perfect spring back. Looking at a steel O Ring made out of stainless-steel, one with a thin wall and the other with a thick wall, the one with the skinny wall would require scale back load to be compressed to groove depth than the one with the thick wall, the place the spring back of the latter will likely be scale back than the one with the skinny wall. Again looking at the same cross section steel O Ring, a seal comprised of Inconel X750 ® or Inconel 718 ® will have a greater load and greater spring again than a equivalent wall thickness metal O Ring constituted of chrome steel. Going over to metal C Rings, there is a distinct similarity with spring again and seating load. The huge change is that metal C Rings when compared with the equal go part metal O Rings, on the whole generate a lower load, and therefore a better spring again than metal O Rings. To overcome the low load of metal C Rings, the spring energised metallic C Ring was once developed. This seal, generates a relative excessive and uniform seating load with a relative high spring again. The Oysterseal ® or steel V Ring, via its form and material choice generates a high spring back, but offers best a reasonable seating load.

Compression or Seating Load

The compression or seating load is expressed in N/mm seal circumference. The greater the burden, the simpler the sealing efficiency shall be. Delicate plating requires lessen load then harder plating. Difficult floor finish of the sealing faces require a higher load to receive similar seal performance. Non plated seals more often than not require severe high masses to obtain technical tightness. It'll be complex, regardless the applied load to obtain a high tightness with unplated seals.

Tightness, Plating

Relying on the desired tightness, medium to be sealed and temperature, one more plating or coating could also be chosen. For tightness higher than 10–9 mbar.L/s a soft plating is invariably required. Indium and Tin are delicate platings. PTFE is a gentle coating too, but the available tightness is constrained to 10–6 mbar.L/s., seeing that of the possess porosity of PTFE. Silver, Gold and Copper are medium tender and require a higher load seal to obtain tightness degrees of 10–9 mbar.L/s. Silver is probably the most original used plating. Nickel plating, being the toughest plating requires a excessive load seal choice.

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ABOUT OUR SEAL

Fixing Concept :

The fixing execution of flexible Metal Seals depends on a the relative high particular contact load at the fixing line and a specific versatility or spring back of the versatile metal seal. 

The seating load and the comparing fixing line width, are a component of the chose seal sort, cross area, material, material thickness and the composite properties itself. 

Contingent upon the required snugness and the media to be fixed, a particular seating burden will be required. Plating or covering with delicate, bendable material will give better fixing by topping off score blemishes. The seating burden will make the pliable layer to stream and top off the section surface anomalies. 

Versatile Metal Seals require a controlled pressure. Regularly these seals are introduced in a machined groove, or the pressure is restricted by a supposed retainer plate.

Exceptions And Particular Cases :

Resilient Metal seals often have to perform under extreme service conditions. Standard solutions as found in this catalog may not always suffice this requirements.

HTMS Futom can alter the standard design and materials to optimize seal performance for a given application.

With high accuracy and backed by FEA in cooperation with the University, HTMS Futom can adjust the seals cross section, wall thickness, selected alloys, to name a few, in order to adapt seal performance to the variables in service.

Type Of Seals :

1)  o ring seal.

2)  v ring seal.

3)  c ring seal.

4)  commaseals.

5)  high pressure seals.

FUNCTION OF A SEAL :

The fixing execution of flexible Metal Seals depends on a the relative high particular contact load at the fixing line created by the pressure of the seal to a specific furrow profundity and a specific strength or spring back of the versatile metal seal. 

Commonly strong metal seals are compacted 20%. For instance a 3,18 mm FH (free stature) seal is compacted to around 2,5 mm. 

• Point B delineates the most extreme depression profundity. Now the seating load as of    now passed 90% of its maximum.

• Point C outlines the base section profundity, or the point where the seating load achieves its most extreme. 

  Diminishing the depression profundity considerably more and along these lines expanding the pressure proportion can prompt seal failure.

• Point D At this point the seals' strength conquers the rest of the (decompression) stack, this versatility is called springback.

• Point E Springback of the seal at 20% of the most extreme burden (Lmax) is the valuable springback.

• Point F Springback of the seal at zero burden is all out springback = flexible recuperation of the seal

Common Reasons for Metal-O-Ring Failure

While O-Rings are an incredibly useful sealing application, they are not infallible. When they fail, it’s usually because of the combined adverse effects of several environmental factors.



The most common causes of O-Ring failures include:

• Improper gland design, allowing for too much or too little compression, not enough for seal expansion and tolerance stack-up.
• Incorrect O-Ring size.
• Incompatibility of O-Ring elastomer and environmental elements.
• Improper O-Ring installation.
• Inadequate O-Ring lubrication.

The blend of weights on the Metal-O-Ring can be intricate and hard to assess. In this way, it is urgent that both the O-Ring compound and size be tried in the genuine environment of its administration. Underneath you'll discover three case of the sorts of O-Ring disappointment that can happen, what causes the disappointment and how to distinguish and redress it.

metal o ring

Designing an Metal-O-Ring involves rigorous testing and attention to detail. In order to meet high-quality standards — like in the aerospace and medical industry – we cannot leave room for error.

The lesson:

The combination of stresses that act on Metal-O-rings can be complex and difficult to evaluate. Because of this, it’s important to be aware of common O-Ring design flaws to help prevent failures within your system. And remember, with flaws or without flaws, it’s equally important that both the O-Ring compound and size be thoroughly tested throughout the process.

OUR PRODUCTS

3. Metal V Ring

The Oyster seal  is designed for maximum spring back, and as a consequence is a low load seal. Because of the low load it will only obtain a good tightness with very soft plating or coatings.

V-ring  seals use radial slinger activity to give successful insurance against dry and wet sullying. In mix with a  metal-cased spiral seal, the V-ring diminishes wear and broadens the administration life of the oil seal and orientation. The V-ring moreover  

Application :

1) The V-Ring is regularly protracted and mounted straightforwardly on the pole .

2) It turns with the pole and seals pivotally against a stationary counter face, at right edges to the pole .

3) The counter face can be the end face of a course or a washer, packing, bearing lodging, or even the metal instance of oil seal .

4) The fixing lip is adaptable and applies just a moderately light contact weight against the counter-face but is still adequate to keep up the fixing capacity .

5) The low contact weight (that differs with the fitted width) permits the seal to run dry in numerous applications .

6) V-Rings are made altogether of elastic without fabric or sheet metal fortification. They are, in this manner, especially simple to introduce .

7) V-Rings can be extended and, contingent upon size, introduced over spines, pulleys and bearing lodgings without excessive disassembling .

8) V-Rings are accessible in different standard cross-segments to meet different space and application prerequisites.

2. Metal C Ring

Metal C-Ring for Internal Pressure (CI) and External Pressure (CE) are designed for high pressure (system pressure energised). They require low bolting load and have good spring back.

C-Ring is utilize the great quality aroused material followed with swine melt glue to shield the staples from shedding and make it advantageous to be used,used the import hot melt cement to joined.

Metal CS-Ring for Internal Pressure (CSI) and External Pressure (CSE) are intended for high weight and astounding snugness execution (framework weight empowered).

There are two types of Metal C Ring :

1) Metal C-ring for internal pressure.

The outside breadth of the metal C-ring for interior weight is acknowledged as reference measurement. The depression outside distance across is to some degree greater than the ring outside measurement. In this manner the ring must be fairly littler than the depression outside distance across.

2) Metal C-ring for external pressure.

Within distance across of the metal C-ring for outside weight is acknowledged as reference measurement. The furrow inside measurement is to some degree littler than the ring inside breadth. In this way the ring inside distance across must be to some degree greater than the section inside breadth.

Manufacturer Products

1. Metal O Ring

Gas filled metal O Ring for high temperature and moderate pressure applications. OGI for internal pressure and OGE for external pressure.

Spring-energised metal O Ring for Internal pressure (OSI) and (OSE) for external pressure are designed for extreme low leakage at moderate pressures.

Internally (OVI) or externally (OVE) vented O Rings are designed for higher pressure. Besides the own seating load the seal is also energised by the system pressure.

Non-vented rings (OI & OE) are designed for lower pressure ranges. The perfectly closed O Ring design avoids ingress of the media into the seal. Moderate load, moderate pressure capability.