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Hydraulic Seal

  1. ซีลรูปถ้วย Cup Seals
    25
    Sep

    ซีลรูปถ้วย Cup Seals

    ซีลรูปถ้วย Cup Seals

    รูปที่ A.21 แสดงรูปแบบซีลถ้วยพื้นฐาน ซีลดังกล่าวทำหน้าที่ซีลในทิศทางเดียวที่ความดันเพิ่มแรงซีล ซีลถ้วยนี้ต้องใช้แผ่นรองเพื่อรักษาตำแหน่งและใช้สำหรับแรงดันสูงถึง 70 บาร์ (1,000 psi)

    Fig. A.21 - Cup Seals (ภาพจาก MFP Seals)

     

    ซีลถ้วยรูปตัวยู (U- Cup Seals) 

    รูปที่ A.22 แสดงให้เห็นถึงการซีลของ  ซีลถ้วยรูปตัวยูแบบไม่สมมาตร ซีลถ้วยรูปตัวยูเป็นที่นิยมมากในกระบอกสูบอุตสาหกรรมและสามารถใช้เป็นซีลลูกสูบหรือก้าน เมื่อใช้กับวงแหวนรอง ความดันของระบบไม่ควรเกิน 173 บาร์ (2,500 psi)

    รูป. A.22 – ซีลถ้วยรูปตัวยู (ขอบคุณภาพ MFP Seals)

    รูปที่ 26 แสดงการติดตั้งของซีลยูคัพ ดังที่แสดง

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  2. การจำแนก-แบ่งลักษณะการทำงาน ของกระบอกไฮดรอลิก
    21
    Sep

    การจำแนก-แบ่งลักษณะการทำงาน ของกระบอกไฮดรอลิก

    [Sealing Knowledge ความรู้คู่ซีล]

    วันนี้จะมา แนะนำความ คำว่า Heavy duty - หรือ Light Duty เค้าใช้เกณฑ์อะไรในการวัด การทำงานของกระบอกระบบไฮดรอลิค

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  3. Hallite 16 Rod Seal
    27
    May

    Hallite 16 Rod Seal

    Design
    Used in tandem, the Hallite 16 rod seal provides the designer with a compact low friction seal for light to medium duty hydraulic cylinders.

    It has a special filled PTFE ring with a pre-loaded lip energised by an O ring. The lip is designed to have a contact area with the rod adequate to retain the media at low pressure. As high pressure acts on the O ring it compresses the lip against the rod increasing the contact area and the effectiveness of the seal. The special PTFE ring has the low frictional properties normally associated with this material but is strengthened by additives to reduce creep. It has a low breakout friction so stick-slip is eliminated. Standard seals are supplied with a nitrile O ring but other materials can be provided. For the best results it is recommended two seals are fitted. The PTFE ring should always be mounted with the sealing lip on the pressure side. Sizes above 30mm are easily installed by deforming the PTFE ring into a kidney shape, sizes under 30mm are best installed using a tool, details of which can be provided. A number of material options can be provided to extend operating conditions. Please ensure that the correct part number is specified for the material option as indicated. 

    NB: Part numbers suffixed by “‡” indicate housing sizes to meet ISO7425-2. 

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  4. Hallite 18 heavy duty Single Acting Seal
    26
    May

    Hallite 18 heavy duty Single Acting Seal

    A medium to heavy duty single acting seal, the Hallite 18 has shown itself over the years to be an effective and robust seal in a wide variety of applications.

    The seal comprises a rubberised fabric U form base to which is bonded a rubber energiser.

    The seal section is pre-loaded by the housing when installed to ensure effective sealing at low pressure. When the pressure increases the rubber energises the U form to increase the sealing area and hence the efficiency of the seal. The strength and durability of the rubberised fabric combines with its ability to retain lubricant keeping friction and wear to a minimum.

    In a piston application the Hallite 18 should not be used back to back to make a double acting assembly.

    NB:  Size lists give “on line” tolerances for rod applications.

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  5. Hallite 621 ROD SEAL
    26
    May

    Hallite 621 ROD SEAL

    The Hallite 621 is a top-of-the-range twin lip rod seal designed to provide a dry sealing solution in heavy-duty applications.

    The secondary sealing lip located behind the primary sealing lip improves stability of the seal in the gland. The unique profile of the NBR energiser ensures the precision trimmed primary sealing lips maintain contact under low or no pressure situations while ensuring proper sealing at higher pressures. This unique profile is also used in the Hallite 622 twin lip rod seal. The Hallite 621 also incorporates an acetal anti-extrusion ring to withstand side loads and extreme pressure peaks even with the extrusion gaps, which are the result of using remote plastic bearing strips like the Hallite 506 or 708.

    The Hallite 621’s seal shell is molded in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance.

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  6. Hallite 610 ROD SEAL Twin Lip Polyurethane
    26
    May

    Hallite 610 ROD SEAL Twin Lip Polyurethane

    Hallite 610 ROD SEAL Twin Lip Polyurethane

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  7. Hallite 730 PISTON SEAL Double-Acting
    26
    May

    Hallite 730 PISTON SEAL Double-Acting

    The Hallite 730 double-acting piston seal in a four part assembly is designed for use in heavy-duty applications where position holding ability is important, such as longwall mining roof support applications using water-based fluids and large diameter crane cylinders using standard hydraulic oils.

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  8. Hallite 51 Piston Seal
    26
    May

    Hallite 51 Piston Seal

    The Hallite 51 is a heavy duty piston seal which, when installed in pairs, provides an excellent double acting piston design. It is particularly suitable for difficult operating conditions such as pressure surging, vibration or some misalignment.

    The seal is an assembly of three parts, a male adaptor, a V ring and a female adaptor. Both the V ring and female adaptor are made from rubberised fabric which has a durability and strength, it also retains lubricant at the sliding surfaces so friction and wear are kept to a minimum. The V ring being the primar seal is more flexible than the adaptor whic supports it and prevents extrusion damage. At higher pressures the adaptor deforms and becomes a secondary seal.

    The polyacetal male adaptor has grooves across the face to ensure pressure is evenly applied to the V ring.

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  9. Hallite 155 for Bore Sealing Applications
    26
    May

    Hallite 155 for Bore Sealing Applications

    The Hallite 155 U-ring static seal designed to seal the joint between the gland and the cylinder bore. The Hallite 155 replaces the conventional O-ring and back-up ring combination.

    Through its special design and polyester material compound, the seal will work with a maximum extrusion gap of 0.40 mm at 500 bar pressure.

    Every nominal diameter of the Hallite 155 is suitable for a range of bore diameters, ØD₁. See part number range for details.

    This seal was developed for water-based, HFA, applications, but can also be used with standard mineral oil fluids.

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  10. Hallite 653 ROD BUFFER SEAL
    26
    May

    Hallite 653 ROD BUFFER SEAL

    The Hallite 653 single-acting rod buffer seal is designed to be used in conjunction with a high-performance rod seal, such as the Hallite 605 and 621, to protect the primary seal from shock pressure loading and high frequency pressure spikes in the hydraulic system. The design allows oil to pass through to the rod seal while holding back pressure spikes. The Hallite 653 is a patented product (European patent no. 0427554BI; U.S.A. patent no. 5088747) that also allows pressure to pass back into the system preventing a pressure trap between the rod seal and the buffer seal. The Hallite 653 is an excellent pressure buffer option in heavy-duty applications and offers extended sealing system life and performance.

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