How Does a Pinch Valve Work?

The pinch valve consists of a body with an elastomeric sleeve inside. During closure, the sleeve is pinched shut from the outside — depending on the actuation type, by air pressure directly on the sleeve, by a pneumatic cylinder, by a handwheel or by an electric actuator. When fully open, the valve offers an almost unrestricted flow path with no dead zones or flow restrictions.

The sleeve is straightforward to replace. Depending on the model, this can be done without removing the full body from the pipeline. This minimises downtime and maintenance costs.

For Which Media Is a Pinch Valve Suitable?

The pinch valve is particularly suitable for media that would damage or block a ball valve or butterfly valve:

• Abrasive media: cement, slurry, ore, sand
• Fibrous media: pulp, fibre suspensions, wastewater with solid particles
• Viscous media: pastes, thick liquids, high-viscosity products
• Powders and granules: plastic pellets, food ingredients, chemical powders

The sleeve closes completely around any particles present, ensuring a reliable seal — even with contaminated media.

Which Actuation Type Suits Your Application?

Pinch valves are available in four actuation types. The choice depends on your process conditions, available energy source and required response time.

Unsure which actuation type is right for you? Provide your process data — medium, pressure, diameter and cycle time — and we will advise the correct version.

Normally Open or Normally Closed?

Most pinch valves are normally open (N/O): when the actuation energy is lost, the valve remains open. For applications where a safe closure is required upon energy failure, Festo also supplies a normally closed (N/C) version. This closes automatically as soon as the compressed air supply is lost. Select the N/C version when your process requires the flow path to be blocked in the event of a fault.

In Which Industries Are Pinch Valves Used?

Pinch valves are used in industries where the medium is demanding for conventional valves:

• Mining: transport of ore, slurry and wash water with high abrasivity
• Food industry: powders, granules and fibre suspensions with hygienic sleeve selection
• Water treatment: wastewater, sewage sludge and media with suspended solids
• Chemical industry: aggressive liquids where the medium must not contact the body
• Construction and prefab: concrete transport and cement applications under high wear loads

The combination of full bore flow, low maintenance requirements and a replaceable sleeve makes the pinch valve suitable for continuous operation in demanding conditions.

What Is the Difference Between a Pinch Valve and a Diaphragm Valve?

Both valves keep the medium separated from the actuator, but they work differently. In a diaphragm valve, a diaphragm is pressed against a weir — suitable for clean to lightly contaminated media in hygienic or pharmaceutical applications. The pinch valve has no weir: the sleeve closes completely across the full bore, so even coarse particles and fibres present no obstruction. Choose a diaphragm valve for hygienic processes; choose a pinch valve for abrasive or fibrous media.

Wear Parts and Sleeve Replacement

The sleeve is the only component in contact with the medium and therefore determines the service life of the valve. AKO-Armaturen supplies sleeves in various elastomers, selected for temperature, chemical resistance and wear load. The sleeve is straightforward to replace. Depending on the model, this can be done without removing the full body from the pipeline. Ebora supplies the wear parts and replacement sleeves for the standard AKO-Armaturen range.

Frequently Asked Questions

Can a pinch valve be used as a throttling valve?

Yes, pinch valves can be used for throttling to a limited extent. The sleeve can be partially pinched to regulate flow. This is particularly suitable for applications with powders or granules. For precise flow control in liquid applications, a control valve is more appropriate.

Which sleeve material should I select for my medium?

AKO-Armaturen supplies sleeves in NR (natural rubber) for abrasive media, EPDM for aqueous and chemical media, and NBR for oil-bearing media. When requesting a quote, provide the medium, temperature and any chemical composition — we will select the correct elastomer.

Up to what pressure and diameter are pinch valves available?

AKO-Armaturen pinch valves are available from DN25 to DN600. The maximum operating pressure depends on diameter and sleeve type, and is typically up to 6 bar. For specific pressure and size combinations, request a technical datasheet via our contact page.

Select the right pinch valve based on medium, diameter and actuation type, or request a quote directly via our contact page.