Economic mixproof valves
Alfa Laval offers two double-seal mixproof valves: The Alfa Laval SMP-BC and the aseptic version, SPC-BCA. The SMP valves enable the flow of two different media through the same valve simultaneously without any risk of cross-contamination. This increases operating efficiencies and significantly reduces operating costs.
High application flexibility
Based on a modular structure, SMP mixproof valves have several valve bodies and components that can be combined in various ways. These self-draining mixproof valves can, for instance, be configured as stop valves and changeover valves.
Plus SMP mixproof valves are constructed from a series of base components, which enables valves to easily be configured to meet different requirements in sanitary and aseptic applications.
Simplified valve maintenance
Few moving parts, a top-loaded plug, a maintenance-friendly actuator make SMP mixproof valves easy to disassemble for quick, straightforward maintenance.
SMP mixproof valve range
The Alfa Laval SMP mixproof valve range offers two standard cost-effective alternatives to the premium Alfa Laval Unique mixproof valve range.
- SMP-BC mixproof valve for applications that require additional safety, leak detection and CIP
- SMP-BCA mixproof valve for aseptic applications
For more information, please refer to Documentation.
Aseptic version
The aseptic version of Alfa Laval's SMP mixproof valve is called SMP-BCA, which is designed for use under mixproof aseptic conditions and sterilization involving high temperatures.
The straight forward design keeps liquids separate by using two seals on the same plug, with a leakage chamber in between.
The PTFE / rubber diaphragm following the movement of the plug in the upper section of the valve body ensures that there is no increase in the concentration of microorganisms in the product during processing.
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Compliance with most hygienic standards
Alfa Laval SMP valves meet most standards requested in the dairy, food and beverage, and personal care industries.
How it works
Construction
The construction of the Alfa Laval SMP mixproof valve range varies, depending on the valve model (SMP-BC and SMP-BCA).
The SMP-BC mixproof valve consists of an actuator, bonnet, plug and valve bodies. Three versions are available: a shut-off valve with one valve body, a shut-off valve with two valve bodies, and a changeover valve with three valve bodies. Clamp rings and a plug clip system secure the valve bodies to the actuator. The clamp ring enables you to turn the valve in any direction.
The SMP-BCA mixproof valve consists of the same valve components as the SMP-BC, but is fitted with a PTFE/EPDM diaphragm designed to prevent contamination from external sources and to withstand high temperature. This makes the SMP-BCA ideal for use under aseptic conditions.
Operating principles
The Alfa Laval SMP mixproof valves are controlled from remote location by means of compressed air. The SMP-BC and SMP-BCA mixproof valves have different operating principles, which are described below.
SMP-BC mixproof valve
The SMP-BC mixproof valve is fitted with two small pneumatic normally open (NO) valves, a detecting valve and a CIP-valve.
The valve plug has two seals, which form an atmospheric leakage chamber. Any product leakage is discharged through the detecting valve. The leakage chamber may be cleaned by supplying CIP into the detecting valve. The SMP-BC is insensitive to water hammer in the product line above the plug.
For changeover valves, a single seal plug separates the lower product lines.
SMP-BCA aseptic mixproof valve
The SMP-BCA aseptic mixproof valve is a normally closed (NC) valve with a proven PTFE/EPDM diaphragm. The special designed aseptic diaphragm hermetically seals against intrusion from the atmosphere and ensures full protection against the effects of microorganisms. It also prevents product build-up on the product contact surface.
The valve plug has two seals, which form an atmospheric leakage chamber. Any product leakage is discharged through the detecting valve. The leakage chamber may be cleaned by supplying CIP into the detecting valve.
Two small pneumatic normally open (NO) valves enable a sterile barrier to be established in the leakage chamber through the continuous application of steam. The chamber must be clean and sterile when the main valve is closed.
For changeover valves, a single seal plug separates the lower product lines but does not require the use of a sterile barrier in the leakage chamber.
SMP-BC shut-off valve SMP-BCA Aseptic shut-off valve
Options
SMP-BC mixproof valve
- Fittings in accordance with required standard
- Valve sensing and control devices, including ThinkTop, ThinkTop Basic and IndiTop
- Actuator with strong spring
- Larger actuator for valve sizes 38-51 mm/DN 40-50
- CIP installation kits
- Various valve body combinations
- Surface roughness, product wetted parts: Ra ≤ 0.8 µm
- Product wetted seals of NBR or FPM
- Service tool for actuator
- Tool for plug seals (Necessary for changing the seals)
SMP-BCA mixproof valve
- Fittings in accordance with required standard
- Valve sensing and control devices, including ThinkTop, ThinkTop Basic and IndiTop
- Larger actuator for valve sizes 38-51 mm/DN 40-50
- CIP installation kits
- Various valve body combinations
- Surface roughness, product wetted parts: Ra ≤ 0.8 µm
- Product wetted seals of NBR and PTFE or FPM and PTFE
- Service tool for actuator
- Tool for plug seals (Necessary for changing the seals)
