Pinch valves – find manufacturers and suppliers

Pinch valves are fittings that regulate or shut off the flow of liquids, gases or powders by mechanically pinching an elastic hose or sleeve.

The medium only comes into contact with the elastic hose, the so-called elastomer, and not with the metal valve parts. This makes pinch valves particularly suitable for abrasive, corrosive or sensitive media, as no moving parts enter the product.

Below is an overview of the function, types and use of pinch valves, as well as an overview of their advantages:

How pinch valves work:

A pinch valve consists of a housing, an elastic sleeve (collar) and an actuating mechanism.
When closing, the elastic sleeve is mechanically or pneumatically compressed ("squeezed"). This interrupts or reduces the flow.
When opening, the sleeve relaxes again and allows full flow.

Important advantage: The medium only flows through the sleeve, making the valve extremely wear-resistant and media-resistant.

Types of pinch valves:

There are several types, which differ according to actuator type, installation form and design:

1. Manually actuated pinch valves:
   Closing takes place via handwheels or levers that compress the sleeve.
   Suitable for small pipe diameters and manual applications.
2. Pneumatic pinch valves:
   A pneumatic actuator (compressed air) squeezes the sleeve together.
   Ideal for automated processes, fast switching and frequent actuation.
3. Hydraulic pinch valves:
   Hydraulic fluid is used instead of air.
   Used when higher closing forces are required.
4. Electric pinch valves:
   Actuated by electric motors or linear actuators.
   Advantage: Integration in automated control systems without compressed air system.
5. Open design / Open body pinch valves:
   The sleeve is accessible from the outside and is pinched directly.
   Cost-effective and easy to replace.
6. Inline pinch valves / closed design:
   The sleeve is installed in a closed housing.
   Provides greater tightness, protection and stability.

Areas of application for pinch valves:

Pinch valves are extremely versatile and are used in many industries:

1. Waste water and sludge technology:
Pinch valves are ideal for abrasive media such as slurries, suspensions or waste water.
They prevent blockages and wear because only the elastomer hose comes into contact with the medium.

2. Chemical industry:
In the chemical and process industries, pinch valves are used for acids, alkalis and other aggressive chemicals.
Thanks to the interchangeable sleeves made of PTFE, EPDM or NBR, valves can be precisely matched to the medium.

3. Bulk and powder conveying:
Pinch valves are also widely used in pneumatic or mechanical conveying systems for powders and granulates.
They are ideal for shutting off, throttling and dosing dry bulk materials.

4. Air and gas applications:
Pinch valves also work for air, gases and dust in pipelines.
As they have no moving metal parts in the medium, they are particularly durable.

5. Food and pharmaceutical industry:
Pinch valves are used in the food and pharmaceutical industries when hygienic conditions are important.
Only the elastomer hose touches the product, which simplifies cleaning and replacement.

6. Automation and process control:
Pneumatically or electrically actuated pinch valves are used in systems that switch frequently and quickly.
They can be integrated into PLC and process control systems and are therefore ideal for fully automated processes.

Advantages of pinch valves:

• No metallic parts in the medium: only the elastic hose comes into contact with the medium - ideal for corrosive or abrasive substances.
• Low wear and long service life: As there are no moving parts in the product flow.
• Full passage: Almost no flow resistance when open.
• Self-cleaning: Deposits are removed when opening and closing.
• Low maintenance: Usually only the sleeve needs to be replaced instead of the entire valve.
• Wide range of materials: Elastomers available for almost every medium (natural rubber, EPDM, NBR, Viton, etc.).
• Easy to automate: Pneumatic, hydraulic or electric actuation possible.
• Cost-efficient: Long service life and easy replacement of the sleeve reduce operating costs.

Pinch valves are robust, flexible and media-friendly fittings that are particularly suitable for difficult media - from abrasive powders and aggressive chemicals to hygienically sensitive liquids.
The choice between manual, pneumatic, hydraulic or electric versions allows perfect adaptation to the degree of automation and operating conditions. Their main advantages lie in their reliability, ease of maintenance, media-compatible design and long service life.

Here is an overview of the most important criteria to look out for when purchasing pinch valves:

When purchasing pinch valves, it is crucial to not only look at the price, but to consider the entire system of medium, pressure, temperature, elastomer, design and automation. A well-founded selection extends the service life, minimizes maintenance costs and reliably protects systems.

• The first step in the selection process is to take a close look at the medium to be controlled.
• Are they liquids, gases, powders or suspensions?
• Does the medium contain solids that have an abrasive effect?
• Is the medium chemically aggressive, corrosive or hygienically sensitive (e.g. food, pharmaceuticals)?
• The elastomer sleeve must be selected to suit the medium. Natural rubber, EPDM, NBR, Viton, PTFE-coated, etc. are available.
• Pinch valves must safely withstand the maximum operating pressure and the maximum temperature:
• Check the nominal pressure (PN) and possible pressure peaks, e.g. for pumps or pneumatic conveyors.
• Select sleeve materials that retain their elasticity even at high or very low temperatures.
• A reinforced sleeve may be necessary for high pressures.
• Pinch valves are available in various designs that are suitable for different applications:
• Open design (exposed sleeve): Simple replacement, cost-effective.
• Closed design (sleeve in housing): Higher tightness, protection against external influences.
• Inline designs for continuous processes.
• Consider whether the valve is to be actuated manually, pneumatically, hydraulically or electrically.
• The actuator type influences speed, precision and integration into the control system:
• Manual for simple applications with low switching frequency.
• Pneumatic for fast, frequent switching and automated processes.
• Hydraulic for high closing forces.
• Electric for systems without compressed air or for direct integration into PLC/control systems.
• Pinch valves are generally low-maintenance, but the sleeve is the wearing part.
• Ensure that the sleeve can be easily replaced without having to dismantle the entire valve.
• Check the availability of replacement sleeves and seals within a reasonable time.
• Good documentation and assembly instructions save time and money when servicing.
• When open, pinch valves usually offer full flow, but the nominal diameter and flow values should be calculated precisely:
• Nominal diameter and flow values should be calculated accurately.
• The pressure loss in the open state should be taken into account in order to avoid unnecessary energy losses.
• Check the quality of the housing materials, steel, stainless steel, aluminum or plastic, and any existing coatings.
• In sensitive areas such as drinking water, food, pharmaceuticals, approvals such as DVGW, WRAS, FDA or EU 1935/2004 are important.
• Look out for manufacturers with ISO-certified production processes and reliable quality control.
• An experienced manufacturer will support you with selection and design.
• The availability of CAD data, pressure loss diagrams and service life calculations facilitates planning and integration.
• Short delivery times for replacement sleeves or complete valves increase operational reliability.
• When purchasing, it's not just the purchase price that counts.
• Consider the total costs over the life cycle (maintenance, replacement of the sleeve, energy losses due to pressure loss).
• A higher-quality solution can quickly pay for itself through a longer service life and lower operating costs.

The purchase of pinch valves requires a holistic approach: medium, pressure, temperature, elastomer material, design, automation and the manufacturer's service availability are the key factors. If you check these factors carefully, you will get a valve that works reliably, durably and economically and thus supports the trouble-free operation of the entire system. A well-chosen pinch valve reduces downtimes, protects system components and lowers overall costs - a clear advantage for any company.

Pinch valves can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Pinch valves around the world on Exportpages.