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LKH UltraPure

Centrifugal Pumps > LKH UltraPureApplications

The LKH UltraPure pump is a highly efficient and economical centrifugal pump, which meets the requirements of the pharmaceutical industries. It provides gentle product treatment and is chemically resistant. LKH UltraPure is available in five sizes, LKH UltraPure-10, -20, -25, -35, and -40.
The LKHU UltraPure pump is a highly efficient and economical centrifugal pump, which meets the requirements of the pharmaceutical industries. It provides gentle product treatment. LKHU UltraPure is available in five sizes, LKH-10, -20, -25, -35, and -40.

Standard design

As standard the LKH UltraPure is delivered with a 45° outlet (counterclockwise). TD 234-054 45° outlet The pump is designed for CIP and SIP with emphasis on large internal roundings and cleanable seals. The LKHU UltraPure pump consists of a standard motor, stub shaft, mechanical compression coupling, adaptor, back plate, impeller, shaft seal, 45° product discharge, and a vertical casing drain. As standard the LKHU UltraPure is delivered with a 45° outlet (counterclockwise). Material traceability EN 10204.3.1.B. (Mill test reports).

Shaft seals

The LKH UltraPure pump is equipped with either an external single or a double mechanical shaft seal. Both have stationary seal rings in acid-resistant steel AISI 329 with sealing surface and rotating seal rings in silicon carbide. Shaft seals The LKHU UltraPure pump is equipped with either an external single or a double mechanical shaft seal. Both have stationary seal rings in stainless steel AISI.

Documentation

How It Works

LKH UltraPure construction

The pump consists of a motor, impeller, pump casing, back plate, mechanical seal, legs, pump shaft/connections and adaptor.

Operating principle

Inside the pump casing, the semi-open impeller rotates along with the pump shaft. The rotation of the impeller blades convey energy to the fluid causing it to move in a circular direction. The movement of the fluid increases in velocity; the velocity of the fluid is partly converted into pressure before it leaves the pump through the outlet.

Unique impeller design

LKH UltraPure centrifugal pumps feature a unique semi-open impeller with a special vane design that ensures particularly low NPSHr (Net Positive Suction Head required). This helps prevent the effects of cavitation and minimizes the risk of mechanical damage.

The semi-open impeller also features balance holes, which provide excellent circulation of process fluid in the shaft seal area and help reduce axial force on the impeller. This reduces wear on the shaft seal and the motor bearings.

The semi-open impeller design provides high flow all around the pump, especially behind the impeller near the shaft seal. This contributes to easy cleanability and enhanced lubrication and cooling of the shaft seal.

External shaft seal

With few wear parts, the front-loaded external shaft seal is designed for high performance and low maintenance. There is no need to disconnect or remove the pump casing for inspection or maintenance, which saves time and money and minimizes downtime. Only five minutes are required to replace the shaft seal.

Perfect sealing and lubrication largely depends on the flatness of the seal faces. All LKH UltraPure pumps have shaft seals that are machined according to stringent requirements and meet the flatness requirement of 3 light bands* or less. The stationary seal ring is solidly affixed to the back plate, providing perfectly aligned seal surfaces even after long periods of operation and potential pressure shocks or vibration in the system.

The balanced design and use of spring force contribute to pressure equalization within the shaft seal area. This minimizes the risk of opening during unforeseen events, such as pressure shock.

Alfa Laval uses the same shaft seal for all UltraPure centrifugal pumps, regardless of size or model. This standardization reduces inventory and makes wear parts replacement quick and easy.

Read more about the standard SolidC UltraPure centrifugal pump.

*Measured at 20°C, one light band corresponds to 0.3 µm flatness over the entire sealing surface.

1: Defined O-ring groove providing firm positioning of the O-ring on pump casing and metal to metal contact provides a predefined compression of the O-rings with no crevices for contaminants.

2: External shaft seal with few wear parts and spring mounted on the atmospheric side, meaning no wear of the spring or other internal parts going into your product.

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