China wholesaler M74D-30mm/G9 Mechanical Pump Seal M74D Mechanical Double Face Seals Shaft Size 30mm for Chemical Pump taylormade shaft adapter screw

Product Description

Product details

  • For plain shafts
  • Dual seal
  • Unbalanced
  • Rotating multiple springs
  • Independent of direction of rotation
  • Seal concept based on the M7 range
  • Variant with pumping screw available (M74F-D)


  • Efficient stock keeping due to easily interchangeable faces
  • Extended selection of materials
  • Flexibility in torque transmissions
  • EN 12756 (For connection dimensions d1 up to 100 mm (3.94″)

Recommended applications

  • Chemical industry
  • Process industry
  • Pulp and paper industry
  • Low solids content and low CZPT media
  • Toxic and hazardous media
  • Media with poor lubrication properties
  • Adhesives
  • Chemical standard pumps

Operating range
Shaft diameter:
d1 = 18 … 200 mm (0.71″ … 7.87″)
p1 = 25 bar (363 PSI)
t = -50 °C … 220 °C
(-58 °F … 428 °F)
Sliding velocity:
vg = 20 m/s (66 ft/s)
Axial movement:
d1 up to 100 mm: ±0.5 mm
d1 from 100 mm: ±2.0 mm

Seal face: Silicon carbide (Q1)
Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1)
Seat G4, G6 (Q1, Q2), Seat G13 (A, B)

Secondary seals: CHINAMFG (E), FKM (V), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G), Duplex (G1)

AK-M74-D Dimensions(mm)
Size d D6 D7 D3 d1 L1 L2 L3
18 18 27 33 33 3 38.0 11.5 19.5
20 20 29 35 35 3 38.0 11.5 19.5
22 22 31 37 37 3 38.0 11.5 19.5
24 24 33 39 39 3 38.0 11.5 19.5
25 25 34 40 40 3 38.0 11.5 19.5
28 28 37 43 43 3 39.0 11.5 19.5
30 30 39 45 45 3 39.0 11.5 19.5
32 32 42 48 47 3 39.0 11.5 19.5
33 33 42 48 48 3 39.0 11.5 19.5
35 35 44 50 50 3 39.0 11.5 19.5
38 38 49 56 55 4 41.0 14.0 22.0
40 40 51 58 57 4 42.0 14.0 22.0
43 43 54 61 60 4 42.0 14.0 22.0
45 45 56 63 62 4 42.0 14.0 22.0
48 48 59 66 65 4 42.0 14.0 22.0
50 50 62 70 67 4 43.0 15.0 23.0
53 53 65 73 70 4 43.0 15.0 23.0
55 55 67 75 72 4 43.0 15.0 23.0
58 58 70 78 79 4 56.0 15.0 23.0
60 60 72 80 81 4 56.0 15.0 23.0
63 63 75 83 84 4 55.0 15.0 23.0
65 65 77 85 86 4 55.0 15.0 23.0
68 68 81 90 89 4 55.0 18.0 26.0
70 70 83 92 91 4 56.0 18.0 26.0
75 75 88 97 99 4 56.0 18.0 26.0
80 80 95 105 104 4 56.0 18.2 26.2
85 85 100 110 109 4 56.0 18.2 26.2
90 90 105 115 114 4 56.0 18.2 26.2
95 95 110 120 119 4 56.0 17.2 26.2
100 100 115 125 124 4 56.0 17.2 26.2

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Riscky Li
Website: http://akman2006
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Structure: Single End
Pressure: High Pressure Mechanical Seals
Speed: High-Speed Mechanical Seal
Temperature: High Temperature Mechanical Seal
Standard: Standard
Balance: Unbalanced


Customized Request

screw jack

How do screw jacks ensure controlled and synchronized movement in multi-jack systems?

Screw jacks are capable of ensuring controlled and synchronized movement in multi-jack systems through various mechanisms and techniques. These systems are commonly used in applications where multiple screw jacks need to work together to lift or position a load. Here’s how screw jacks achieve controlled and synchronized movement in multi-jack systems:

  • Mechanical Synchronization: Screw jacks can be mechanically linked in a multi-jack system to ensure synchronized movement. This can be achieved through the use of rigid couplings, connecting rods, or gear mechanisms that interconnect the input shafts of individual screw jacks. As a result, when one screw jack is operated to lift or lower the load, the mechanical linkage transfers the motion to the other screw jacks, causing them to move in sync. This ensures that all jacks contribute proportionally to the load and maintain a consistent lifting height.
  • Electrical Synchronization: In addition to mechanical synchronization, screw jacks can also be electrically synchronized in multi-jack systems. This is typically achieved through the use of motorized screw jacks controlled by a centralized control system. Each motorized screw jack is equipped with position sensors or encoders that provide feedback on their current position. The control system receives this feedback and adjusts the motor speed and direction for each screw jack to ensure synchronized movement. Electrical synchronization enables precise control and allows for adjustments to be made dynamically, compensating for any variations in load distribution or environmental conditions.
  • Load Sharing Mechanisms: In multi-jack systems, load sharing mechanisms can be employed to distribute the weight evenly among the screw jacks. Load sharing mechanisms can include load sensors or load cells that measure the individual loads on each jack. The control system then adjusts the lifting force applied by each screw jack to ensure equal distribution of the load. This prevents overloading of any individual jack and promotes balanced movement in the system.
  • Position Feedback and Control: Screw jacks in multi-jack systems can be equipped with position feedback devices, such as linear encoders or limit switches, that provide information on the position of the load. This feedback is used by the control system to precisely control the movement of the screw jacks, ensuring that they reach and maintain the desired positions. By continuously monitoring the position feedback, the control system can make adjustments to keep the jacks synchronized and maintain the desired level of control.
  • Control System Integration: A centralized control system can be used to integrate and coordinate the operation of multiple screw jacks in a multi-jack system. This control system can utilize programmable logic controllers (PLCs) or computer numerical control (CNC) systems to manage the movement, synchronization, and safety aspects of the screw jacks. The control system enables precise control, real-time monitoring, and the implementation of safety features, enhancing the overall performance and reliability of the multi-jack system.

By employing these mechanisms and techniques, screw jacks ensure controlled and synchronized movement in multi-jack systems. These systems find applications in various industries, such as heavy lifting, material handling, and industrial automation, where precise positioning and synchronized operation are critical requirements.

screw jack

What are the common signs of wear or issues that might require screw jack maintenance?

Regular maintenance is important for ensuring the proper functioning and longevity of screw jacks. It helps identify and address potential issues before they escalate into more significant problems. Here are some common signs of wear or issues that might indicate the need for screw jack maintenance:

  • Unusual Noise: If a screw jack starts producing unusual noises during operation, such as grinding, squeaking, or knocking sounds, it could indicate a problem. These noises may be a result of worn or damaged components, inadequate lubrication, misalignment, or other mechanical issues. Prompt maintenance is necessary to diagnose and resolve the source of the noise.
  • Increased Friction: If the movement of the screw jack becomes more difficult or requires excessive force, it could indicate increased friction within the mechanism. This may be caused by insufficient lubrication, contaminated lubricant, or worn components. Addressing the friction issue through maintenance, including lubrication and inspection of components, is important to prevent further damage and ensure smooth operation.
  • Excessive Play or Backlash: Excessive play or backlash refers to unwanted movement or looseness in the screw jack assembly. It can occur due to worn or damaged components, improper assembly, or misalignment. Excessive play can negatively impact the precision, stability, and load-bearing capacity of the screw jack. Maintenance should be conducted to identify the cause of the play and rectify it to restore proper functionality.
  • Irregular Movement: If the screw jack exhibits irregular or jerky movement instead of smooth and consistent operation, it may indicate issues with the drive mechanism, misalignment, or worn parts. Irregular movement can affect the performance and accuracy of the screw jack, potentially leading to safety hazards or reduced efficiency. Maintenance is necessary to diagnose and address the underlying causes of irregular movement.
  • Leakage or Seal Damage: Screw jacks equipped with hydraulic or lubricant-filled systems may experience leakage or seal damage over time. Leakage can result in a loss of lubrication or hydraulic fluid, leading to inadequate lubrication, reduced performance, or system failure. Regular inspection and maintenance of seals, gaskets, and fluid levels are necessary to identify and rectify any leaks or seal damage.
  • Visible Wear or Damage: Physical inspection of the screw jack is essential to identify visible signs of wear or damage. This may include worn threads, cracked or damaged housing, bent or misaligned components, or signs of corrosion. Any visible wear or damage should be addressed through maintenance to prevent further deterioration and ensure safe and reliable operation.

Regular inspection and maintenance are crucial to detect and address these signs of wear or issues promptly. It is recommended to follow the manufacturer’s guidelines for maintenance intervals and procedures to ensure the optimal performance and longevity of screw jacks.

screw jack

How do manufacturers ensure the quality and reliability of screw jack mechanisms?

Manufacturers employ various quality control and testing measures to ensure the quality and reliability of screw jack mechanisms. These measures are implemented throughout the manufacturing process to verify that the screw jack meets the required standards and performance specifications. Here are some common practices manufacturers use to ensure quality and reliability:

  • Design and Engineering: Manufacturers invest in robust design and engineering processes to develop screw jack mechanisms that meet the intended specifications. This includes selecting appropriate materials, determining the optimal thread design, and performing structural analysis to ensure the screw jack can handle the expected loads and movements. Thorough design and engineering processes contribute to the overall quality and reliability of the mechanism.
  • Material Selection: Manufacturers carefully select materials with the necessary strength, durability, and corrosion resistance for the construction of screw jack mechanisms. High-quality materials, such as alloy steels or stainless steels, are often chosen to ensure the longevity and reliability of the screw jack. Material selection is based on factors such as load requirements, environmental conditions, and industry standards.
  • Quality Assurance: Manufacturers implement comprehensive quality assurance processes to monitor and control the manufacturing steps. These processes include inspections, audits, and documentation to ensure that each screw jack meets the specified quality standards. Quality assurance measures may involve checks for dimensional accuracy, thread quality, surface finish, and proper assembly. Through quality assurance, manufacturers can identify and address any potential defects or deviations from the desired specifications.
  • Testing and Performance Evaluation: Manufacturers conduct rigorous testing and performance evaluations to verify the functionality, load capacity, and reliability of screw jack mechanisms. This may involve load testing, endurance testing, and cycling tests to simulate real-world operating conditions. Testing helps validate the performance of the screw jack and ensures that it can handle the intended loads and movements without failure or significant degradation over time.
  • Compliance with Standards: Manufacturers ensure that screw jack mechanisms comply with relevant industry standards and regulations. Compliance with standards such as ISO (International Organization for Standardization) or specific industry standards provides assurance of the quality and reliability of the product. Manufacturers may obtain certifications or undergo third-party audits to validate compliance with these standards.
  • Customer Feedback and Continuous Improvement: Manufacturers value customer feedback and use it to drive continuous improvement in the design, manufacturing, and performance of screw jack mechanisms. By actively seeking input from customers and end-users, manufacturers can identify areas for enhancement and implement changes to improve the quality and reliability of their products.

By implementing stringent design processes, careful material selection, thorough quality assurance, testing and performance evaluation, compliance with standards, and continuous improvement practices, manufacturers ensure the quality and reliability of screw jack mechanisms. These measures help deliver screw jacks that meet the industry’s expectations for performance, safety, and durability.

China wholesaler M74D-30mm/G9 Mechanical Pump Seal M74D Mechanical Double Face Seals Shaft Size 30mm for Chemical Pump   taylormade shaft adapter screwChina wholesaler M74D-30mm/G9 Mechanical Pump Seal M74D Mechanical Double Face Seals Shaft Size 30mm for Chemical Pump   taylormade shaft adapter screw
editor by CX 2023-12-16