SMP

SMPConcept

SMP-BC is a sanitary pneumatic seat valve, designed for safety and leak detection when two different products flow through only one valve. The valve is often used as a part in CIP return lines or other systems not experiencing pressure spikes offering leakage detection for greater safety.

Working principle

SMP-BC is remote-controlled by means of compressed air. The valve is a normally closed (NC) valve. The valve is fitted with two small pneumatic normally open (NO) valves, a detecting valve and a CIP-valve. The valve plug (the upper plug in a change-over valve) has two seals, forming a leakage chamber under atmospheric pressure between them. Leaking product flows into the leakage chamber and is discharged through the detecting valve. SMP-BC can be cleaned by CIP by supplying compressed air to the actuator (see fig. 1). During cleaning of the valve, flow pattern against the closing direction of the valve plug makes SMP-BC insensitive to water hammer.

Documentation

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

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)

Make an Online Enquiry