The sliding movements, that is, a piston in a tube, risks metal to metal contact which will damage the surface and the seals. Therefore piston and rod need to be supported by precision guiding elements like wear rings, wear bands or guide rings.
Many pumps, including many dry pit non clog and industrial end suction pumps that are fitted with semi-open impellers are fitted with a means to adjust the shaft (and therefore the impeller) axially, thereby moving the impeller closer to the suction side of the casing. This mitigates the recirculation, but does move the impeller forward in the case, thereby opening the gap in the back, possibly allowing contaminants free access to the shaft and seal, and moving the impeller discharge position within the case (increasing the turbulence in the pump). Utilization of low cost wear rings to protect other more expensive components is a much more acceptable solution to many users, and has become an industry standard.
Wear rings are, simply, rings of material that are affixed to either the case (volute) or impeller to protect that portion of the pump. Generally, these rings are, simply, rings of material that are affixed to either the case (volute) or impeller to protect that portion of the pump. These rings can be defined as a device used to seal the pressure leakage of the liquid between the inlet of the impeller and the pump casing. They are typically found on sewage pumps with closed impellers. A similar device that serves the same function called a wear plate can be found on some pumps with a semi open impeller.
The typical reason for using a wear ring is to decrease the amount of leakage loss around the impeller. Due to more work available to push the pumped liquid out the discharge there is a slight improvement in pump efficiency. This becomes important as the pump size and pressure is increased but not as important on small pumps up to 15 brake horsepower. The function of the wear ring is to help keep the piston centered, which allows for even wear and pressure distribution on the seals. Popular wear ring materials include glass filled Nylon, bronze filled PTFE, glass filled PTFE, Phenolic and PEEK. These rings are used in both piston and rod applications. Wear rings are available in butt cut, angle cut and step cut styles.
Apart from wear rings, Darcoid Nor Cal Seal specializes in many other accessories that are widely used in a lot of industries, such as machine tool, boat, automobile, metallurgical machinery, chemical machinery, engineering machinery, building machinery, plastics, agriculture and different instruments. Darcoid Nor Cal Seal is a globally recognized endeavor in the industry of mechanical parts. Darcoid aggregates the trade leads in this hydraulic seals and other dynamic seals, along with O-rings, semi conductor seals, composite seals, gaskets and the likes. The company aims to deliver and aid to benefit their clientèle. They have been serving various sealing and machinery aid needs since 1947. The endeavor has been serving as a global leader delivering excellent sealing and machinery aiding solutions.
Rod Seals
Seals have been used since ancient times and have evolved into a wide variety of shapes and materials.
Rotary Shaft Seals
The rotary shaft seal is used for excluding dirt, dust, water or other particles, while retaining lubricant in rotary shaft equipment. It was developed as a means of protecting bearings of rotating shafts.
Integral Seals from Darcoid Norcal Seal
An integral seal is named so because it effectively integrates a stamped or machined metal or molded plastic retainer with a molded in place rubber sealing element to create an extremely versatile sealing device.
