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Product Description

Product Description

YJ-D series part-turn electric type worm gearbox suitable for Ball Valves, Butterfly Valves, Plug Valves,etc. 

YJ-D series part-turn electric type worm gearbox has good mechanical quality and steady operating performance. It has high mechanical efficiency, material you can choose according to the open times and electric actuator output speed. The flange connecting to valve is according to ISO5211.

Product Parameters


Model YJ-0-D YJ-1-D YJ-2-D YJ-2J-D YJ-30-D YJ-3-D YJ-60-D YJ-3J-D YJ-4-D YJ-100-D YJ-4J-D YJ-5-D YJ-230-D YJ-5J-D YJ-6-D YJ-6J-D YJ-7-D YJ-7X-D YJ-7J-D YJ-8-D YJ-8J-D YJ-9-D
Ratio 34:1 44:1 44:1 50:1 70:1 50:1 70:1 50:1 55:1 70:1 57:1 62:1 70:1 67:1 65:1 75:1 82:1 70:1 75:1 75:1 60:1 82:1
Max output torque
500 1200 1600 3500 3000 4500 6000 7500 12000 10000 16500 22000 23000 28000 38000 48000 63000 80000 100000 140000 190000 250000
Max stem diameter 30 42 50 60 75 60 90 75 90 110 105 110 120 120 120 145 160 180 180 200 220 220
Flange F10 F12 F14 F16 F16 F16 F25 F20 F25 F30 F30 F30 F35 F35 F35 F40 F40 F48 F48 F48 F60 F60
φD 125 150 175 210 210 210 300 250 300 350 350 350 415 415 415 475 475 560 560 560 686 686
PCD D0 102 125 140 165 165 165 254 205 254 298 298 298 356 356 356 406 406 483 483 483 603 603
N-H-DP 4-M10-15 4-M12-18 4-M16-20 4-M20-30 4-M20-30 4-M20-30 8-M16-24 8-M16-24 8-M16-


Company Profile




Q: What’s your main products?
A: Our main products are worm gearbox, bevel gearbox and spur gearbox for gate valve, globe valve, ball valve, butterfly valve and etc.

Q: How long is your delivery time?
A: Delivery time was depends on the quantity of the order and our inventory, normally is 10~15 days.

Q: Term of payment?
A: T/T 30% in advance, T/T balance before shipment.

Q: Can you provide free sample?
A: Yes, we can provide the sample for free, but the shipping costs need paid by yourself.

Q: Could you specially design and produce according to client’s requirements?
A: Yes, we can

If any other questions about our products, welcome to contact us.


Application: Industry
Function: Change Drive Torque
Step: Single-Step
Type: Worm Gear Box
Material: Ductile Iron, carbon Steel (Customizable)
Output Torque: 500nm to 250000nm


Customized Request

worm gearbox

Self-Locking Properties in a Worm Gearbox

Yes, worm gearboxes exhibit self-locking properties, which can be advantageous in certain applications. Self-locking refers to the ability of a mechanism to prevent the transmission of motion from the output shaft back to the input shaft when the system is at rest. Worm gearboxes inherently possess self-locking properties due to the unique design of the worm gear and worm wheel.

The self-locking behavior arises from the angle of the helix on the worm shaft. In a properly designed worm gearbox, the helix angle of the worm is such that it creates a mechanical advantage that resists reverse motion. When the gearbox is not actively driven, the friction between the worm threads and the worm wheel teeth creates a locking effect.

This self-locking feature makes worm gearboxes particularly useful in applications where holding a load in position without external power is necessary. For instance, they are commonly used in situations where there’s a need to prevent a mechanism from backdriving, such as in conveyor systems, hoists, and jacks.

However, it’s important to note that while self-locking properties can be beneficial, they also introduce some challenges. The high friction between the worm gear and worm wheel during self-locking can lead to higher wear and heat generation. Additionally, the self-locking effect can reduce the efficiency of the gearbox when it’s actively transmitting motion.

When considering the use of a worm gearbox for a specific application, it’s crucial to carefully analyze the balance between self-locking capabilities and other performance factors to ensure optimal operation.

worm gearbox

How to Calculate the Input and Output Speeds of a Worm Gearbox?

Calculating the input and output speeds of a worm gearbox involves understanding the gear ratio and the principles of gear reduction. Here’s how you can calculate these speeds:

  • Input Speed: The input speed (N1) is the speed of the driving gear, which is the worm gear in this case. It is usually provided by the manufacturer or can be measured directly.
  • Output Speed: The output speed (N2) is the speed of the driven gear, which is the worm wheel. To calculate the output speed, use the formula:

    N2 = N1 / (Z1 * i)

N2 = Output speed (rpm)
N1 = Input speed (rpm)
Z1 = Number of teeth on the worm gear
i = Gear ratio (ratio of the number of teeth on the worm gear to the number of threads on the worm)

It’s important to note that worm gearboxes are designed for gear reduction, which means that the output speed is lower than the input speed. Additionally, the efficiency of the gearbox, friction, and other factors can affect the actual output speed. Calculating the input and output speeds is crucial for understanding the performance and capabilities of the worm gearbox in a specific application.

worm gearbox

Types of Worm Gear Configurations and Their Uses

Worm gear configurations vary based on the arrangement of the worm and the gear it engages with. Here are common types and their applications:

  • Single Enveloping Worm Gear: This configuration offers high torque transmission and efficiency. It’s used in heavy-duty applications like mining equipment and industrial machinery.
  • Double Enveloping Worm Gear: With increased contact area, this type provides higher load capacity and improved efficiency. It’s used in aerospace applications, robotics, and precision machinery.
  • Non-Throated Worm Gear: This type has a cylindrical worm without a throat. It’s suitable for applications requiring precise motion control, such as CNC machines and robotics.
  • Throated Worm Gear: Featuring a throat in the worm, this configuration offers smooth engagement and higher load capacity. It’s used in conveyors, elevators, and automotive applications.
  • Non-Modular Worm Gear: In this design, the worm and gear are a matched set, resulting in better meshing and efficiency. It’s utilized in various industries where customization is essential.
  • Modular Worm Gear: This type allows interchangeability of worm and gear components, providing flexibility in design and maintenance. It’s commonly used in conveyors, mixers, and material handling systems.

Selecting the appropriate worm gear configuration depends on factors such as load capacity, efficiency, precision, and application requirements. Consulting gearbox experts can help determine the best configuration for your specific needs.

China high quality Yj-D Series Part-Turn Electric Type Valve Worm Gearbox   wholesaler China high quality Yj-D Series Part-Turn Electric Type Valve Worm Gearbox   wholesaler
editor by CX 2023-09-15

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