Non reverse ratchet vertical pumps. All cast iron construction, WPI enclosures with heavy stainless steel rodent screens make for a rugged durable design. It is commonly used in vertical motor applications, especially in pumps, where reverse flow or backspin due to gravity or pressure can cause serious mechanical stress or system damage. The Non-Reverse Ratchet provides immediate protection against reversing due to phase reversals or from backspin at shutdown. We are the only manufacturer to offer this feature and not put a depth limitation on the ratchet. e. GE Motors Value Line vertical hollow shaft (VHS) WPI product line is a high thrust design intended for deep-well pump applications. Many oil . The Value Line product offering ranges from 5 - 300 horsepower and is compatible with a variable speed drive. Our vertical hollow shaft motors represent the ultimate in a premium quality motor at ultra competitive price levels. All motors are stocked as extra heavy duty pin style, non-reverse ratchet coupling that can be removed and converted to self release coupling. A non-reverse ratchet, herein also referred to as NRR, provides immediate protection against reversing due to phase reversals or from backspin at shutdown. MOTORS®’ Non-Reverse Ratchet (NRR) is typically used in deep well applications where water lubricated pump bearings are installed. S. Feb 21, 2024 · Non-Reversing Ratchet (NRR) Assemblies Many times, vertical motors are equipped with a non-reverse ratchet (NRR), also known as an anti-rotation assembly. Dec 17, 2011 · Non-reverse ratchets (See Figure 8) prevent pump backspin when the power is off and the column of water falls through the pump impeller. As the water flows back into the well and the water level drops below the upper shaft bearings , the pump will operate dry. In general, the pump is located in the well casing and is driven with a long shaft that is coupled to the motor shaft by one of the various available couplings, i. MOTORS ® brand vertical pump motors with non-reverse ratchet to operate at any depth setting. May 15, 2013 · Good Answer: When the pump stops the water will begin running back toward and through the pump if there is no check valve installed in the line. Ultra Series vertical pump motors are completely NEMA premium efficient, meeting IEEE 841 levels with a full cast iron frame, inline, high thrust, space heaters, and a non-reverse ratchet. Depending on the motor manufacturer, these configurations can be designed with either ball or pin assemblies. Durable construction meets the requirements in a wide range of vertical hollow and solid shaft motor applications. May 23, 2025 · A Non-Reverse Ratchet (NRR) is a mechanical locking device mounted on the motor shaft to prevent reverse rotation. If allowed to run dry for any period of time, failure would occur. Nov 7, 2024 · Vertical motors are normally used for pump applications. Features & Benefits: Introduction NMTG Non-Reverse Ratchet (Ratchet-Pin type): Non-Reverse Ratchets (Holdbacks) are typically used in Deep well Vertical Turbine Pump applications where Electric motors drive Pumps. This will cause the impellers in the turbine pump to spin in the Non-Reverse Ratchet and Self Release Couplings Non-Reverse Ratchet U. The application can comprise for example water lubricated pump bearings. The NRR Non-Reverse Ratchet This feature is used in deep well applications where water lubricated pump bearings are installed. This feature allows U. All standard and Non-reverse ratchets are typically used in deep well applications where vertical electric motors that drive pumps, for example water pumps, are installed. Depending on the well depth, backspin can reach dangerous speeds if unchecked. , bolted, self-release, or non-reverse Non-Reverse Ratchet and Self Release Couplings Non-Reverse Ratchet U. The reason is to stop the shaft while the pump water column is receding. vdgdap zkyq qnkzat jxdm scdvo hjhgmxik okvb emput zfhz ocaymk