Welded pipe joints: reliable work, working pressure, up to 32MPa or higher, but the assembly workload is large and requires high welding quality, not suitable for thin-walled steel pipes

Tube joints: no need for welding, no additional seals, small size, easy to assemble and disassemble, widely used in high-pressure systems

Flared pipe joint: simple structure, good reusability, suitable for medium and low pressure systems where thin-walled pipe connections generally do not exceed 8MPa

Hose joints: Hose joints are available in detachable and crimped types. Depending on the pipe diameter, they can be used in hydraulic systems with working pressures of 4-40MPa.

Quick connector: The full name is quick assembly and disassembly pipe joint. No assembly and disassembly tools are required. It is suitable for frequent assembly and disassembly.

Overall type: The inner cavity of the main engine is used as the oil tank. Its structure is compact and various leaked oils are easy to recover. However, the heat dissipation is poor and it is easy to cause thermal deformation of adjacent components, affecting the accuracy of mechanical equipment and making maintenance inconvenient.

Separate type: an independent device separated from the main engine. It has flexible layout and easy maintenance. It can reduce the impact of fuel tank heating and hydraulic vibration on working accuracy, and facilitates the design of generalized and serialized products.

Design considerations

Surface filter: The surface of the filter element of the surface filter is in contact with the hydraulic medium. This filter material acts like a screen to retain impurity particles on its surface.

Depth filter: In a depth filter, the oil must flow through complex gaps to achieve the purpose of filtration.

Intermediate filter: The filtration method of the intermediate filter is between the above two

basic requirements

Select

Installation location

Within the working pressure and a certain temperature range, it should have good sealing performance, and can automatically improve the sealing performance as the pressure increases.

The friction between the sealing device and the moving parts should be small, and the friction coefficient should be stable

It has strong corrosion resistance, is not easy to age, has a long working life and good wear resistance, and can automatically compensate to a certain extent after wear.

It has simple structure, convenient use and maintenance, and low price.

gap seal

O-ring

Lip seal

Combined sealing device

Rotary shaft sealing device

type

Function

Installation location: When absorbing hydraulic shock or pressure pulsation, it should be installed near the impact source or pulsation source; when replenishing oil and maintaining pressure, it should be installed as close to the corresponding actuator as possible

Installation Precautions