Manufactured from themoplastic EPDM and Brass, these clever toggle fasteners have numerous applications. Most often used to secure hardware and other objects to thin steel, aluminium, plywood or fibreglass surfaces where there is no access to the cavity.
Rubber Nut,Rubber Nutsert,Expanding Rubber Nut,Rubber Anchor Nut Taizhou Hongchuang Hardware Co., Ltd. , https://www.taizhouhongchuang.com
With a captive Brass Nut, the toggle expands within the cavity as it is tightened. The rubber-like compound provides a seal against water and salt penetration while insulating against vibration.
Available in a range of sizes to suit many applications onboard your vessel.
Sold individually, with automatic discounts for purchases over 1000 units.
Note that the nuts have metric threads and the bolt is not supplied.
M3,M4,M5,M6,M8,M10 & M12 also available
Submersible pump structure principle and use points
Submersible pumps are highly versatile tools in water treatment and fluid management. Designed to operate fully submerged, they can be lowered into water sources for various applications. These pumps are widely used for extracting groundwater to the surface, providing domestic water supply, aiding in mining rescue operations, supporting industrial cooling systems, enabling farm irrigation, lifting seawater, transferring liquids on ships, and even creating fountains or landscape water features. Additionally, hot water submersible pumps are ideal for geothermal bathing, while deep well submersible pumps are essential for accessing underground water sources. They are also commonly used in reservoirs, drainage systems, and other water infrastructure projects.
Mainly utilized for farmland irrigation and water supply in mountainous regions for both humans and livestock, these pumps are also critical in central air conditioning systems, heat pump units, cold pump systems, and urban or industrial settings such as factories, railways, mines, and drainage sites. The flow rate of a typical submersible pump ranges from 5 to 650 cubic meters per hour, with head capacities reaching up to 550 meters.
How a Submersible Pump Works
Before starting the pump, the suction pipe and pump casing must be completely filled with liquid. Once activated, the impeller spins at high speed, causing the surrounding liquid to rotate along with it. Due to centrifugal force, the liquid is thrown outward from the impeller blades. As the liquid moves through the pump housing’s diffuser chamber, its velocity decreases, and pressure increases. This pressurized liquid is then discharged through the outlet pipe.
At the center of the impeller, a low-pressure area forms due to the removal of liquid, creating a vacuum that draws more water from the source through the suction pipe. This continuous process ensures that the pump continuously draws water from the source and discharges it through the outlet.
Structure of a Submersible Pump
A standard submersible pump consists of several key components: the pump body, pumping pipe, base, submersible motor, and a starter protection device. Over time, advancements in technology have led to the development of a wide variety of submersible pump models tailored to different needs.
Types of Submersible Pumps
Based on application, submersible pumps can be categorized into several types: well submersible pumps, surface-located submersible pumps, sewage submersible pumps, sand-handling submersible pumps, vertical pumps, and others used in mining. Depending on the medium being pumped, they can also be classified as water submersible pumps, sewage submersible pumps, or submersible seawater pumps (which are resistant to corrosion).
Installation Options
Submersible pumps can be installed in different orientations depending on the environment:
1. Vertically, such as in standard wells.
2. Inclined, like in mine tunnels.
3. Horizontally, for use in pools or tanks.
Important Operating Notes
1. Ensure the power supply is properly grounded and equipped with a leakage protection device.
2. Keep the discharge pipe as straight as possible, and promptly repair any leaks to minimize energy loss.
3. If the water contains debris, install a filter to prevent clogging.
4. Check the power supply polarity before starting to avoid reverse rotation, which could lead to no water flow.
5. If any abnormal conditions occur during operation, immediately shut off the power, investigate the issue, and only resume operation after the problem is resolved.