Flow Diversion Valve for Pasteurization Systems | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Flow Diversion Valve

Definition

The Flow Diversion Valve is a component used in Continuous Flow Pasteurization Systems within the food manufacturing industry. Its primary function is to control the routing of liquid products between heating, holding, and cooling sections, ensuring that proper pasteurization temperature is maintained. The valve automatically diverts under-processed product away from the forward flow path, typically returning it for reprocessing. This is achieved through a three-way configuration that switches between the pasteurization loop and the return loop based on signals from temperature sensors and the control system. The valve is available in nominal diameters from 25 to 100 mm (ISO 6708), with larger sizes available on request. Operating pressure ranges from 1.0 to 1.6 MPa;for reliable sealing. Operating temperature is -10 to 150°C, with PTFE seals degrading above 150°C. Flow coefficient (Kv) ranges from 10 to 160 m³/h at full open, varying with size (IEC 60534-2-3). Leakage rate is ≤0.01% of rated flow, meeting Class VI seat leakage. Actuation is pneumatic, either double-acting or spring return, with supply pressure of 0.4–0.8 MPa (ISO 5211). Electrical supply for solenoid pilot or positioner is 24 V DC ±10%, and control signal is 4–20 mA (IEC 60947-5-6). Body material is CF8M (equivalent to 316 stainless steel) per ASTM A351, and seal material is food-grade PTFE (ASTM D4894). Ingress protection is IP65 (IEC 60529). Weight ranges from 5 to 40 kg depending on size and actuator. All values are reference ranges; verify model-specific specifications with the manufacturer.

Working Principle

The valve operates via pneumatic actuation, either double-acting or spring return. Temperature sensors in the pasteurization system send signals to a control system, which commands the actuator to change the valve position. In a typical three-way configuration, the valve directs flow either forward through the holding tube or diverts it back to the raw product tank. When the product temperature is below the required pasteurization temperature, the valve diverts the flow to the return loop. Once the correct temperature is achieved, the valve shifts to allow forward flow. The actuator is powered by compressed air at 0.4–0.8 MPa, and the position is controlled via a 4–20 mA signal to a positioner or solenoid pilot. The valve's internal seals, made of food-grade PTFE, ensure a tight shut-off to prevent leakage. The valve is designed to operate within specified pressure and temperature ranges; exceeding these limits can cause seal degradation or insufficient sealing force.

Common Materials

Stainless Steel 316L, Food-grade elastomers

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	25–100 mm	Matches pipeline size; larger sizes on request.ISO 6708
Operating Temperature	-10–150 °C	Above 150°C PTFE seals degrade.
Flow Coefficient (Kv)	10–160 m³/h	Full open; varies with size.IEC 60534-2-3
Leakage Rate	≤0.01 % of rated flow	Class VI seat leakage.ISO 5208
Actuator Type	Pneumatic	Double-acting or spring return.
Supply Pressure	0.4–0.8 MPa	For pneumatic actuator.ISO 5211
Electrical Supply	24 ±10% V DC	For solenoid pilot or positioner.
Control Signal	4–20 mA	For positioner feedback.IEC 60947-5-6
Body Material	CF8M	Equivalent to 316 stainless steel.ASTM A351
Seal Material	PTFE	Food-grade, FDA compliant.ASTM D4894
Ingress Protection	IP65	For electrical enclosure.IEC 60529
Weight	5–40 kg	Depends on size and actuator.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body
Main housing containing flow channels and ports

Material: Stainless Steel 316L
Actuator
Mechanism that moves the valve element between positions

Material: Stainless Steel/Aluminum
Seals/Gaskets Part
Prevent leakage between flow paths and to atmosphere

Material: Food-grade EPDM or PTFE
Valve Diverter Element
The moving part that actually switches flow between forward and return.
Positioner Optional
Takes the 4-20 mA command and drives the actuator to that position.

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Frequently Asked Questions

What is the purpose of a flow diversion valve in a pasteurization system?

It ensures that only properly pasteurized product moves forward by diverting under-processed product back for reprocessing, based on temperature signals.

What are the operating limits for this valve?

The valve is rated for 1.0–1.6 MPa operating pressure and -10 to 150°C. Above 150°C, PTFE seals degrade.

How is the valve actuated?

It uses pneumatic actuation, either double-acting or spring return, with supply pressure of 0.4–0.8 MPa. Control is via 4–20 mA signal to a positioner or solenoid pilot.

What materials are used in construction?

Body is CF8M (equivalent to 316 stainless steel) per ASTM A351, and seals are food-grade PTFE per ASTM D4894. Ingress protection is IP65.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 10 bar
flow rate:	0.5 to 50 m³/h
temperature:	-10°C to 150°C
slurry concentration:	Up to 40% solids by weight

Flow Diversion Valve

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