Hydraulic Seals

Hydraulic Seals (or reciprocating seals) cover a wide range of applications including brake cylinders, mobile, earthmoving and agricultural equipments, industrial production machines such as presses, injection moulding and rolling mills, and very large cylinders in areas such as the marine industry. A typical arrangement of a hydraulic seal is shown in the following figure.

The selection of a particular hydraulic seal type is very important as it not only depend on the duty but also on the operating environment. We can make self-energizing elastomer or plastic seals for your high and low pressure hydraulic applications. The sealing pressure of a typical hydraulic seal is about 5000psi. With our design, we can extend this pressure to 10 000 psi (ASD 10k series), 12 000psi (ASD 12k series) and even up to 100 000 psi (ASD 100k series) for highly specialised application.

Our hydraulic seals have the capability to provide low dynamic leakage and positive static sealing. Hydraulic seals rely on the compression in the groove to provide an initial sealing force. We can optimize the static and dynamic geometry to ensure you can obtain an optimum seal installation. Some examples of the hydraulic seals we made for our customers are shown below

Another aspect that we take into consideration when designing a hydraulic seal for you is the seal stability. As it is very unlikely for a dynamic component to be accurately concentric, the combination of stress and friction will vary around the perimeter of the seal. This unfortunate event may lead to a distortion force which can cause your seal to twist in the groove during operation. Contact us and we will make a hydraulic seal that will not undergo such distortion. When we make a hydraulic seal for you, we will consider force, friction, pressure gradient, geometry, fluid characteristic, the sealing mechanism and follow a rigorous material selection procedure developed in-house.

From our experience, the contact stress distribution of a hydraulic seal on rod or piston is a critical factor in determining the type and profile of seal to be used in your system. The correct use of profile will prevent your seal failure, prevent oil leakage and it will also lower the stress applied on your system. These advantages will result in lower energy being expensed and hence, saving you cost.

We can make the hydraulic seals with nitrile, hydrolysis resistant polyurethane, PTFE, perfluoroelastomer, ethylene propylene, with fabric and/or plastic anti-extrusion heel, U-ring, V-ring, or designs energized by a resilient elastomer. We can also compound a material according to your requirement. The hydraulic seals that we make will be complied to the ISO hydraulic seal system standard.

We can make hydraulic seals for rod or piston application; please click on the following to explore further:

U-cup (U-profiled seals)	Vee-Packings	Double-Acting seals
T-seals	PTFE seals	PTFE U-seals with V-spring or coil spring
C-cups