QUADRING - 4440 - 170.82X6.99

Product description:

• X-rings are double-acting four-lip seals with an almost quadratic cross-sectional profile.
• The X-ring obtains its sealing function by installation and compression in an axial or radial installation chamber
• In operation, the medium pressure reinforces the sealing function

Operating parameters:

• Temperature NBR: -30 °C to +100 °CTemperature
• FKM: -15 °C to +200 °COther
• materials, e.g. VMQ, EPDM and H-NBR are possible on request


• Pressure (MPa):
  • Dynamic, reciprocating up to 5 MPa, up to 20 MPa with support rings
  • Static up to 5 MPa, up to 40 MPa with support rings
  
  
• Speed (m/s):
  • Back and forth = 0.5Rotating
  • = 2

Areas of application:

• X-rings are similar in use to an O-ring
• They serve, for example, as radial and axial seals for flanges, bushings and covers (static use) or as seals for piston and piston rod, rotating shafts and covered screw movements (dynamic X-rings are mainly used for dynamic applications, as they require less pretensioning than O-rings and therefore produce less friction
• Also very often used for quasi-static applications and for reciprocating movements

Advantages of the X-ring (compared to the O-ring application):

• Great stability in dynamic application, as the X-ring does not tend to roll in the groove on account of its almost quadratic cross-sectional area
• X-rings require a low radial preload. This results in lower friction due to lower pressing forces
• A lubricating film can form between the sealing lips
• Optimal sealing function due to better pressure distribution over the almost square cross-section
• No adverse influence by membrane, as it is positioned between the sealing lips rather than centrally on the outer diameter, compared to O-rings

Installation spaces:

• The installation spaces (grooves) for X-rings should be inserted rectangularly as far as possible and should be carefully machined. Burrs, scratches and nicks should be avoided. To facilitate assembly, the surface can be coated with several layers

Media suitability

• NBR
  • Good chemical resistance to mineral oils and greases, hydraulic oils H, HL, HLP, flammable liquids HFA, HFB, HFC up to approx. +50°C and water up to max. +80°C
• FKMGood
  • chemical resistance to mineral oils and greases, synthetic oils and greases, engine, transmission and ATF oils up to approx. +150°C, motor fuels, flammable liquids HFD, aliphatic, aromatic and chlorinated hydrocarbons and water up to max. +80°C. FKM is highly weather, ozone and ageing resistant, allows little gas to pass through (making it extremely suitable for vacuum applications) and is highly resistant to chemicals

Assembly:

• When mounting, any damage to the X-ring must be avoided, otherwise leaks may occur
• In addition, please observe the following instructions:
  • The X-ring must not be stretched to its elongation limit
  • The steel parts must be burr-free, radius and bevels must be seamless
  • Dust, dirt, metals and other particles must be removed
  • Thread and installation spaces for other sealing and guide elements should be covered with a mounting sleeve
  • Mounting surfaces and the X-rings themselves should be coated with suitable grease
  • Heating in oil or hot water to approx. 80 °C makes elastomers more elastic. This makes the X-ring easier to stretch for assembly