??Hydraulic seals basic requirements

??Hydraulic seals and sealing means for liquid sealing capability that it can be sealed liquid fluid tight chamber without allowing fluid to flow out or liquid leaking out where the cavity. Hydraulic seal static seal which can be done while still moving seal is not easy to do. This concept has been much fluid outflow or leakage, which means that the sealing of the concept to reflect the merits of certain hydraulic seal ability. The so-called leak tightness is the amount of volume or mass of the liquid per unit of time. At present it is a good dynamic seal tightness or leakage of small amounts up to 0.1mL / h. Referring to this tightness can compare the sealing capability of the various types of seals and sealing device, or the Top of its sealing performance of the pros and cons.

??Hydraulic seal friction is small: In order to avoid or reduce the low-pressure hydraulic equipment generates negative phenomena such as crawling, requiring hydraulic seal has a low static friction and dynamic friction, and the friction coefficient should be very stable.

??Hydraulic seal leakage is minimal: Requires hydraulic seal leakage is small, has a good seal, and the progress of its sealing function automatically with the pressure of the hydraulic fluid is high, even at high pressure and high temperature and other harsh working conditions, hydraulic leakage seals and no significant increase.

??Good hydraulic seal compatibility: due to long-term immersion hydraulic seal in the hydraulic oil, highly swollen, dissolved or hardened embrittlement, so that the loss of sealing effect, thus requiring hydraulic seals for hydraulic oil phase with good capacitive.

??Hydraulic seal performance and characteristics

??Small amount leaked hydraulic seal and long service life: the amount of leaked hydraulic seal is extremely small, have a good seal, and with the increased pressure of the hydraulic oil and active role in the progress of its sealing, even at low pressure and low temperature environment unruly task the amount of leaked under hydraulic seal and no significant increase. Hydraulic seal should have good elasticity, heat resistance, cold resistance, pressure resistance, wear resistance and mechanical strength for sure, and the use of long life.

??Hydraulic seal friction is small: To prevent the occurrence of low-voltage equipment or add hydraulic creeping other bad scene, request hydraulic seals have low static friction and dynamic friction, and the friction coefficient should be very strong.

??Good hydraulic seal compatibility: due to hydraulic seals temporary immersed in the oil, or highly swollen, dissolved or hardened embrittlement, so that the loss of the sealing effect, and thus requests hydraulic seals for hydraulic oil phase have good capacitive.

??Hydraulic seals seals emphasis - such as the decision point in the activity of the inner diameter of the rod seal or piston seal Spots in outer diameter and the like.

??The direction of movement of the hydraulic seals - to determine the direction of movement of the location where the hydraulic seals, such as reciprocating, rotary, or screw fixing.

??Hydraulic seal temperature rating - from the original description of the use of mechanical inspection or assessment by the actual working environment temperature, determine the required use of materials. Related to temperature class can be reference to the following production and user precautions.