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Unique Sampling Valve

Unique Sampling ValveConcept

The Unique Sampling Valve is a single seat valve designed for sterilisation before and after each sample. The valve body and connecting pieces are made from one piece of material to avoid cracks and welding pores.

Working principle

Sterilising: when the valve is closed, the channel between the valve ports is open for sterilisation. If using steam, a small pressure relief valve (optional) on the outlet is recommended. Sampling: when the valve is opened, the stem and the membrane seal are retracted, allowing liquid to pass.

Standard design

The valve consists of three parts, a valve body, an actuator and a membrane seal. The rubber membrane seal is placed on the stem of the actuator and works as a stretchable plug. The valve bodies and actuators are interchangeable. The single seat valve can be upgraded to a double seat valve by replacing the handle or actuator with an upgrade kit – see ordering leaflet for accessories.

Documentation

Construction

Unique sampling valves consist of a valve body, an actuator and membrane seal. The rubber membrane seal is placed on the stem of
the actuator and functions as a stretchable plug. The valve bodies and
actuators are interchangeable.

Product range

Unique sampling valves are available as single- and double-seat
sampling valves with working pressures up to 6 bar and maximum
temperatures of 130 °C.

Valve type Size Product type Max. Particle size
Single-seat

Double-seat

Type 4 Low viscosity Up to 2,5 mm
Single-seat

Double-seat

Type 10 Medium viscosity Up to 7 mm
Single-seat

Double-seat

Type 25 High viscosity  Up to 20 mm

Membrane seals are made of FDA-approved EPDM or silicone. Choice of manual or pneumatic actuators is available. Other options include types of valve bodies, connections, actuators and accessories.

Sampling accessories

Alfa Laval’s has a broad range of high quality sampling accessories to provide the food and beverage, personal care and biopharm industries with comprehensive sampling solutions. Alfa Laval provides accessories for sampling such as non-return valves, quick couplings, pressure relief valve for steam sterilization and the Alfa Laval Steam generator making it possible to steam sterilize in locations without permanent steam supply.

For further information on the accessories please see the PD sheets for non return valve, quick connection, pressure relief valve and steam generator.

Operating principles

Unique single-seat sampling valves

Designed for standard hygienic sampling, the single-seat sampling
valve has two positions: open and closed. It can easily be upgraded to a
double-seat valve by replacing the handle or actuator with an upgrade
kit.

Open position for sampling

To begin the sampling process, rotate the handle in a counter-clockwise direction to open the valve, if using an manual valve. If using a actuator, open the valve by activating the actuator. This retracts the valve stem and the membrane and enables the product to flow freely through the open valve.

Closed position for sterilization: To stop the sampling process, rotate
the handle in a clockwise direction to close the valve, if using a manual
valve or shut the air connection, if using a pneumatic actuator.
This shuts off the flow and makes the channel in between the connecting hoses available for sterilization. If steam is used for Sterilization-in-Place, Alfa Laval recommends the use of an optional pressure relief valve on the outlet.

A new level of accuracy with patented new technology

The design of single-seat technology poses challenges for complete
sterilization. In closed position, the membrane seal comes into contact
with the valve seat. These points of contact are virtually impossible to
clean due to tight surface compression and may therefore accumulate
product residue and microorganisms. For that extra level of security to
ensure a more representative sample, Alfa Laval recommends double seat technology.

Unique double-seat sampling valves

Designed for truly sterile sampling, the double-seat sampling valve has three positions: open, closed and sterilization.

Open position

To begin the sampling process,

Manual valve: rotate the handle in a counter-clockwise direction to open the valve.

Pneumatic valve: supply air to the open connection.

This retracts the valve stem and membrane seal and enables the product to flow freely through the open valve.

Closed position

To stop the sampling process:
Manual valve: Rotate the handle in a clockwise direction.
Pneumatic valve: Shut off the supplied air to the open connection.

Sterilization position

To set the valve in sterilization position,

Manual valve: rotate the handle clockwise to the steam position.

Pneumatic valve: apply air to the steam connection.

This extends the valve heads inner spindle into the inner seat and stop product flow in the valve port. At the same time the valve heads outer spindle retracts and lifts the membrane seal away from its normal seat. Now it is possible to access the hard-to-reach areas on the seat surface, ensuring thorough sterilization and making the Unique double-seat sampling valve a solid and reliable choice to achieve 100% representative sampling.

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