Shield pumps are generally categorized based on factors such as temperature, pressure, the presence or absence of particles, and the viscosity of the liquid being transported. Common types include the standard (basic) type, reverse circulation type, high-temperature type, suction type, mud separation type, and specialized designs for ships, nuclear power plants, and absorption refrigeration systems. Today's latest order updates are available for free! Get the most recent buyer information at no cost! Grab this opportunity now!
①The standard magnetic pump is primarily used for non-particle media with low vapor pressure and moderate temperatures. Typically, the operating temperature does not exceed 150°C, and a single-stage impeller can achieve a head of up to 220 meters.
â‘¡ The reverse circulation type, also known as the reverse flow shield pump, features an internal circulation system that uses high pressure within the impeller. It is ideal for transporting easily vaporizable liquids, often referred to as "easy vaporization" type. The medium enters the pump chamber through the inlet, most of it is discharged via the impeller, while a portion is directed into the motor. This fluid first lubricates the front bearing, then flows through the stator and rotor shields to cool the motor. Unlike standard shield pumps, this fluid does not return to the inlet but instead flows back to the vapor zone in the inlet tank through a rear orifice.
③ High-temperature shield pumps can handle media with temperatures up to 450°C. These pumps typically require an external cooling system and use insulation plates to isolate the motor section from the pump head. Even when the liquid reaches 450°C, the internal motor temperature remains below 100°C, allowing the use of standard insulation class motors. In cases where external cooling is unavailable and the motor power is low, heat-resistant coils may be used, though they are generally suitable for temperatures below 400°C.
â‘£ The high-melting point type is equipped with jackets on both the hydraulic end and the motor side of the shield pump. These jackets can be filled with steam or heated liquid to prevent high-melting-point materials from crystallizing. If an external circulation tube is used, it should also be insulated with steam or electric heating.
⑤ The self-priming shield pump is designed for applications where the liquid level is below the pump’s inlet centerline. It can operate effectively even after being restarted following a shutdown. The maximum suction lift is usually around 6 to 7 meters, depending on the setup.
â‘¥ The mud separation type is suitable for transporting media containing suspended particles. A flushing port is installed on the motor side of the mud-type shield pump. Clean flushing fluid is injected through this port to cool the motor, lubricate the bearings, and prevent particles from entering the motor compartment. A spacer ring or mechanical seal is typically placed between the motor and the pump body.
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