Trunnion Ball Valve can be 2 pcs and 3 pcs structure with metal seat or PTFE seat in forging or casting body which used to shut off or connect medium of pipeline, such as water, steaming, petroleum products, nitric acid, acetic acid or urea etc. Trunnion ball vavle usually suitable for big size and high pressure system with advantages of anti-static device design, blow-out proof stem, stable double sealing performance, long service life etc. The valve size can be from 8" to 42" with matching valve pressure from class 150 to class 1500 which operated by worm gear, handwheel, pneumatic actuator or electric actuator. Flange connection with pipeline is common type for trunnion ball valve.
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Worm Gear Screw Lift Foundation: Worm Drive
The worm gear drive is a widely used mechanical system known for its high reduction ratio and smooth operation. It is commonly found in various industrial applications, including machine tools, precision instruments, lifting systems, and construction equipment. This type of transmission is especially useful when a large speed reduction is required in a compact space.
A worm gear system consists of two main components: the worm and the worm wheel. These parts work together to transmit motion and power between two non-parallel, non-intersecting shafts, typically at a right angle. In most cases, the worm acts as the driving element, while the worm wheel serves as the driven component. In practical applications, an Archimedes worm is often used due to its unique trapezoidal thread profile, which resembles a linear rack in axial cross-section. Worms can be either left-handed or right-handed, with right-handed being more common in standard designs.
One of the key advantages of using a worm gear in a screw lift system is its stable and quiet operation. Additionally, if the helix angle of the worm is small, it can provide a self-locking effect, preventing the system from back-driving under load. However, this type of drive also has some disadvantages, such as relatively low efficiency, higher cost, and heat generation during operation. For these reasons, worm gear drives are often paired with specialized reducers in construction lifts to enhance performance and durability.
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