Hydraulic seals are rings that are designed to seal areas between the components inside a hydraulic cylinder. A hydraulic cylinder contains many different components, some of which are exposed to high pressure, high temperature and fluids. Hydraulic seals are designed to fit the specific components in a hydraulic cylinder while creating a leak-proof seal around them, to prevent fluid from leaking around these components.

2. Types of Hydraulic Seals
Hydraulic seals are either static or dynamic, depending on their application. Both seal types are used in hydraulic cylinders. The difference is that static seals remain stationary, whereas dynamic seals are exposed to motion.
Static hydraulic seals
They are used in applications where the element with which it's used doesn't move. The static hydraulic seals are not exposed to movement, but they are still exposed to high pressure.
Dynamic hydraulic seals
On the other hand, Dynamic seals are exposed to movement.
Ex. Rod seals are a type of dynamic hydraulic seal. A piston rod is a moving part, and the Rod seals are designed to seal these piston rods.




3. Applications of Hydraulic Seals
Piston seals prevent fluid or other media to by-pass the piston as the system pressure pushes the piston down the cylinder during a pressure cycle. They are generally single-acting seals, which means the stress acts only on one side; and double-acting seals, which means the stress acts on both sides.
Material | NBR /FPM /HNBR /ACM /AEM /PTFE /Silicone and more |
Type | SC /TC /TB /SB /VC /TA /TB /VB /VA /KC /DC and more |
Size Range | inner diameter from 5mm to 3.4m |
Color | black, brown, blue, green and more |
Feature | oil resistant, water resistant, wear resistant |
Temperature | -40°C - 220°C |
Pressure | up to 0.05 MPa |
Spring | carbon steel or stainless steel |
Hardness | 30-90 shore A |
Packing | PE bag or paper roll inside, carton outside |
4. Company Profile


Q:Where is your factory located ?
A:Our factorty is located in Xianju, Taizhou which is close to Shanghai and Ningbo Port.
Q:How long is your delivery?
A:For stock items ,we can ship them immediately after receiving payment .
For other items,we will need 14-25 days for mass production depends on the quantity and types of the order.
Q:Do you provide free samples ?
A:Usually we do not provide free samples .There is a sample cost which can be refund after you place order .
Q:What do you usually shipped through?
A:Air freight, Sea freight,express is the widely used shipment due to small weight and size for Mechanical seal
Q:What's your payment terms ?
A:We accept T/T, Paypal, Western Union when qualified goods are ready for ship.
For amount less than 1000USD ,100% in advance.
For amount more than 1000USD,30% in advance ,balance payment before shipment
Q:I can not find our products in your catalog ,can you make customized products for us ?
A:Yes ,Customized products is available .OEM is welcomed.
Q:I don't have drawing or picture available for custom products, could you design it?
A: Yes,we can make the best suitable design in accordance with your application.