PRODUCTS

Piston Seals

Piston Seals are used to seal pressurized fluid or air between the piston and the bore in a hydraulic or pneumatic cylinder (Dynamic Pressure Sealing).

Piston seals are used in both Reciprocating and Linear applications. Piston seals are typically classified into single-acting (pressure acting on one side only) and double-acting (pressure acting on both sides) seals.

Rod Seals

The Rod Seal often decides the overall performance of an entire hydraulic or pneumatic cylinder.

The Rod Seal has to meet the most demanding requirements and in addition to normal wear and aging, a Rod Seal is directly affected by changes on the rod surface such as temperature extremes.

In addition to the sealing function, rod seals also provide a thin lubrication film on the piston rod that lubricates themselves and the wiper seals. The lubricant also inhibits corrosion of the piston rod surface. However, the lubrication film must be thin enough so that it returns to the cylinder during the return stroke.

Leakage through the Rod Seal is one of the most common failures and therefore it is vitally important to choose the correct Rod Seal type and design to suit a particular application.

Rod Seals for both Hydraulic and Pneumatic cylinders, as well as Buffer Seals, Back-Ups and Custom Rod Seals.

Wipers

Wipers (also commonly known as Scrapers, Excluders and Dirt Seals) are designed to keep the rod and cylinder clean and free from foreign matter, such as dust, dirt and moisture. Wipers are used in both Linear and Dynamic sealing applications.

Wipers come in a wide variety of Press-in and Snap-in styles, and, as well, we offer the option of Wipers that are custom made to suit your specific needs.

A Wiper is not a pressure sealing element. Instead, it avoids the abrasive effects which result if contaminants reach the sealing and rod bearing elements of a fluid power system.

Contaminants can cause significant damage to the rod, cylinder wall, seals, valves and other components and may lead to premature seal and component failure.

Particular attention should be given to the selection of the Wiper, to protect against such failure. The following should be taken into consideration:

- Groove Geometry - Snap-in vs Metal-case styles.

- Lip Geometry - Single lip, Straight, Bevelled or Rounder Wiper lip designs.

- Environment - High-Contaminated Environment Wipers, Dust-exclusion Wipers, Low-friction Wipers, Dry-rod Operation Wipers, High Temperature Wipers

Guide Rings

The function of Wear Ring (or Guide ring) is to guide the piston and piston rod of an hydraulic cylinder, absorbing transverse forces.

At the same time, the Wear Ring prevents metal-to-metal contact, optimizing the performance of the sealing system.

We supply hydraulic Wear Rings in different materials and specifications to suit a variety of industry applications. Wear Rings come pre-formed, or in strip form.

Wear Ring Materials

- Bronze / PTFE - This material is used in low to medium duty applications where there are limited radial forces. This material is available in strips (of filled PTFE) or pre-formed to size. The strip material can be cut to any length to fit any rod or bore size without losing its concentricity.

- Glass / Nylon - This material is used in medium to heavy duty applications and the Wear Rings are made of glass reinforced nylon. With physical properties equivalent to bronze, Wear Rings made of glass-reinforced Nylon are highly recommended because of their wear rate and non-scoring properties and their ability to ingest metal chips.The temperature range is -40 degrees to 110 degrees and glass-reinforced Wear Rings have high compressive and tensile strength.

- Fabric-reinforced Polyester Resin - This strip material is for heavy-duty applications where there are high radial forces. The use of woven fabric-reinforced polyester resin produces a dimensionally accurate rectangular strip which can be cut to any length. Low coefficient of friction and high compressive strength makes it an ideal bearing material and it is used in temperatures ranging from -40 degrees to 130 degrees.

Back up Rings

A Back Up Ring is a ring of hard, extrusion resistant material such as Nylon, or PTFE, which is designed to fit between an O-ring and an extrusion gap, to prevent the extrusion of the O-ring leading to O-ring failure.

Extrusion failure is one of the most common types of O-ring failure. When the internal pressure of an application becomes too great, the O-ring will actually extrude into the clearance gap.

This extruded product will quickly be nibbled away causing a loss of material, and once sufficient material is lost, seal failure will quickly follow.

There are three options to prevent this:

1) Reduce the clearances to lower the extrusion gap - This is the most expensive option.

2) A cheaper solution is to raise the durometer of the O-ring. Although, a higher-durometer O-ring offers superior extrusion resistance, it is often not a feasible solution due to either material availability, or to the fact that harder durometer materials have limited low pressure sealability.

3) The last and best option is the addition of a Back Up Ring. While Back Up Rings are used in conjunction with O-rings in both static and dynamic sealing applications, the gland they fit in must be specially designed to fit both the O-ring and the Back Up.

One Back Up ring should be used on each side of the "O" Ring in double acting assemblies and if possible two Back Ups should be used even in single acting assemblies.

If only one Back Up Ring is used, the "O" Ring should be placed between the pressure source & the Back Up Ring.

Back Up Rings also allow an O-ring to withstand much higher pressures and are recommended for use with O-rings (or other seals) in pressures exceeding 1,500 psi or in designs featuring large clearance gaps.

Rotary Seals

Rotary Seals (also commonly known as Oil Seals, Lip Seals or Radial Shaft Seals) are used to retain lubricants in a case housing, e.g. in rotating or oscillating shafts, rods or bores.

Rotary Seals increase the life of a bearing by minimizing contaminants (e.g. dirt and water) from getting inside, which could cause damage or premature failure of parts.

Rotary Seals are available in low pressure or high pressure styles and typically in either Silicon or Nitrile, but if heat or chemical attack is a concern, we offer specialist materials such as FKM and Polyurethane.

Static Seals -O-Rings, Cords, Quad-Rings and O-ring Kits

An O-ring is the world’s most commonly used sealing device and the worlds simplest sealing device. An O-ring is exceptionally versatile, with a wide range of applications ranging from garden hose couplings to critical aerospace duties.

We can provide moulded O-rings, in both imperial and metric sizes, including Encapsulated O-rings and Quad Rings and we can supply O-ring Kits whose contents are tailored to suit specific client needs.

We also stock a comprehensive range of O-ring Cord, cut to any length as required;

O-rings can be supplied in variety of materials: NBR, EPDM, Viton- FKM / FPM, Silicon, PU, HPU, HNBR and many more.