Extruded Rubber Products
We at VIGHNESH Rubbers are capable of manufacturing almost any kind of extruded rubber products. Custom profile extrusions are common among the manufactured extruded rubber products. An extruded rubber product differs from a molded rubber product in that the uncured rubber is forced through a die of the desired cross-section under pressure from an extruder. The extruded product is then vulcanized, or cured, in a heated pressure vessel known as an autoclave. Our extrusion equipment can produce extruded rubber products in all shapes: o-ring cord, beading, tubing, squares and rectangles, and profiles in a wide variety of sizes. Our extrusions meet standards and specifications.
There are various types of Hydraulic Seals. Among them few are :
Lib Seals are very versatile and can be used as rod seals or piston seals. They are considered to be multi-purpose hydraulic seals and are designed for significantly improved performance.
Standard Lib Seal
The Standard Lib Seal is the most widely used design of Lib Seal. By energizing the sealing libs with an endless O-ring, you are assured of uniform, positive lib contact and excellent low-pressure sealing. The seal depth is equal to the radial width, which results in a square design. Standard Loaded Lib Seals can be widely used to interchange with existing hydraulic packing and/or O-rings without changing dimensions.
Lib Seal Type “B”
The Lib Seal Type “B” features a back-bevelled sealing lib. This provides greater film breaking and increased unit loading at the sealing surface. The seal depth is generally 1 ½ times the radial width to ensure hydraulic seal stability in the most rugged applications. It is most commonly used as a rod seal.
Lib Seal-Deep Style
The Lib Seal-Deep Style incorporates the same unique design as the Standard Lib Seal, plus its depth is 1 ½ times greater than the radial width. This increases seal stability to withstand rugged, high shock, heavy-duty applications. This seal will replace many kinds of ‘V’-Packing.
U-Cups seals derive their name from their shape and are self-sealing on both the inside diameter and outside diameter. They are most often used for sealing rams or rods and are very popular due to the small gland space required. They are especially adapted to low speed, low pressure environments for both pneumatic and hydraulic cylinders. They provide an extremely smooth, steady movement because of their inherent low friction.
The seal is obtained by means of the flared, flexible libs coming in contact with the rod or cylinder wall. Clearance is provided at the heel for minimum friction. Through this design, the packing is preloaded when installed. Sealing effectiveness is increased by internal pressure of the air or fluid (hydraulic seal) against the inner surface of the libs. For continued sealing effectiveness and long seal life, the surface finish of the working surface of either rods or bores should be a maximum of 16 micro-inches. It is not recommended that U-cups or any other single lib seal be used in any application where there is excessive side loading.
The main function of the Rod Wiper is to keep the rod and cylinder clean and free from foreign matter; thus preventing premature failure. The Rod Wiper is not a pressure sealing element, yet it avoids possible abrasive effects which may result if contaminates were to reach the sealing and rod bearing elements.
Piston T- Seals
The T-Seal is compact and provides an excellent option to bulkier types of seals in a double or single acting application. It requires significantly less packing space than V- Packing’s, V-Cups, or Piston Cups. The result is a compact, efficient and less costly overall component.
The T-Seal is used in reciprocating hydraulic and pneumatic equipment and in high-pressure applications. It is an excellent direct replacement for other packing’s) such as those in standard grooves). It fits into the same simple groove as O-rings and eliminates rolling or spiralling, even under long stroke or dry rod conditions. It does not wedge into clearances or pinch off under motion or pressure and has good low-pressure sealing capabilities.
Because the T-Seal is supplied with a back-up on both sides of the sealing area, it functions very well in double acting applications. The back-ups are split for ease of installation.
Like other similar packing’s, the T-Seal is compressed to eliminate low-pressure leakage. However, the back-up rings float between the T-Seal’s flanges and the rod or bore, minimizing friction and wear. When pressure is applied, a bridge is formed before extrusion can occur.
The T-Seal’s back up utilizes hydraulic pressure to keep it in contact with the rod or cylinder wall. This prevents extrusion from occurring. The T-Seal resists spiral failure. When piston or rod movement does occur, even under very low pressures, the design allows the back-up rings to lock the sealing element in place.
V-Packing’s are multiple-lib (chevron) seals comprised of a group of endless rings and are popular for sealing rods and pistons. They can be used for low or high pressure applications and with sing or double acting cylinders.
We presently stocks in fabric reinforced nitrile and V-Rings (centre rings) in fabric reinforced nitrile. In general, fabric ‘V’ seals are for high pressure, and homogeneous ‘V’ seals are for low pressure. The selection of fabric or homogeneous compounds should be made on the basis of operating pressure, temperature, and the type of gaseous or fluid medium with which the packing must function.
While similar to ‘V’ packing’s, the ‘WV’ style provides sealing properties that are largely independent of stack packing pressure. The ‘WV’ is designed so that it will provide a multiple lib hydraulic seal in a fixed gland depth packing. Because of the design of the WV packing, the libs of each ring are free to flex when in a nested stack so each lib automatically reacts to fluid or air pressure, providing a better seal in a given packing space. There is no compression adjustment required during the seal life.
Since the ‘WV’ Packing is a multiple lib hydraulic seal, it is recommended over a single lib seal for applications where side loading is a factor. The multiple libs also provide extra stability. If one seal fails, there will be another seal to serve as back-up.
There is an interference built into both the I.D. libs and the O.D. libs so that there will be sealing capabilities at low pressure. We stocks Centre Ring and Flat Back WV packing’s in homogenous Buna rubber and fabric reinforced Buna.
Piston Cups Seal
Piston Cups Seals primarily used on piston heads, plungers or rams in hydraulic or pneumatic service. Its mechanical sealing surface is at its periphery. Pistons Cups are commonly used because of economical cost, excellent service life, efficient assemble universal acceptance, and simple accessories.
Homogeneous Piston Cups are recommended to handle low pressures (under 150 psi) in air, water, hydraulic fluids, and lubricating oils. Homogeneous Piston Cups stocked by Vighnesh Rubbers are in Nitrile Rubber. They are also available in other homogeneous materials such as EPR, fluorelastomer, and silicone. Fabric reinforced Piston Cups prevent extrusion in medium pressure installations (up to 1000 psi) or where diametrical clearances are greater.
Window Rubber Seals
This window rubber seals are suitable for fitting either Perspex, glass or acrylic into boats, cars, vans etc. It allows for easy replacement of damaged windows. To find your required size measure your glass and panel thickness. The rubber will seal approx -1mm (e.g. 4mm glass will seal in a 5mm gap). It is recommended to bed the rubber in with a silicone sealant.
Rubber U Channel Section
For protecting edges on panels, doors, glass, etc. It is also suitable for making a seal around glass in Aluminium window channels. The width of the section can be increased by bonding neoprene strip along side it or the panel thickness can be reduced by bonding a strip into it.
Flocked Lined Window Rubber
The flocked lined window rubber comes in two different forms and is suitable for sliding windows that need to retain a waterproof seal. It is preformed U shape and fits directly into a channel. The flat flocked strip is ideal for fitting into different size channels. It is easily bent to form a U shape. Greater widths can be obtained by joining two pieces together. It makes an ideal replacement for Polyester ribbon.
The D Profile is an extruded and self adhesive EPDM cellular rubber sealing strip. Basic application is in Window & doors: draught excluder for medium gaps in older frames, Metal doors: draught excluder on new doors, Metal cupboards: door seal.