There are two types/models of Pinch Valves:
- Air operated Pinch Valves are supplied directly with compressed air/fluid
- Mechanical Pinch Valves are actuated under force from a mechanism and actuator
Pinch Valves are characterized by a free flow of product, guaranteed because of the nominal passage of practically all pinch valve nominal diameters. Advantages of Pinch Valves include minimum frictional resistance and non-clogging.
The particularly robust, elastic fabric-reinforced Pinch Valve sleeve allows for successful working of Pinch Valves, even under extreme conditions. Pinch Valve sleeves prove their worth, particularly because of their long service life. For instance, if very abrasive media is being conveyed with a very high switching cycle frequency. A selection of nine different elastomer grades and different body/flange/socket materials ensures that Pinch Valves may be used practically without restriction in almost all industrial sectors. Due to its simple structure, air operated pinch valve represents a particularly low cost/economic shut-off valve solution, because a separate drive is not required for actuating the air operated pinch valve. In fact, only a 3/2-way solenoid valve or pilot valve is needed to control the air operated pinch valve.
The highly-elastic, air operated pinch valve sleeve shuts off the product flow with a 2-3bar differential pressure supply (depending on elastomer quality) and then moves back to the open position without being driven because of its great rebound resilience, once the pinch valve body has been bled.
Due to its very simple structure, air operated pinch valve is an extremely easy to maintain valve which can be repaired or serviced directly on site at the customer's with the aid of installation instructions.
The valve solution for isolating and regulating/metering abrasive, corrosive and fibrous products such as granulates, powder, pellets, dust and liquids containing solids, etc.
Air operated Pinch Valve Function:
Air operated Pinch Valve is supplying compressed air/fluid (minimum pressure difference 2 bar) into the air operated Pinch Valve casing compresses the sleeve, which is specially manufactured with high rebound elasticity. The body's design guarantees that the sleeve can close freely to form a lip shape. This ensures that the product flow is completely sealed off tight and that the sleeve is guaranteed the longest service life at the same time. This closes the air operated Pinch Valve and completely seals off the flow of the product. The maximum operating pressure is dependent on the nominal diameter and is around 2-6 bar. As soon as the supply of compressed air/fluid is interrupted and the air operated Pinch Valve casing is vented or drained, the specially manufactured sleeve is opened by its rebound elasticity/resilience, enabling the pressure in the medium to flow through the full passage
Advantages:
Free flow of product, minimum frictional resistance, 100% leak free, no blockages and low net weight are among the most important benefits of air operated Pinch Valves.
A flattened and elliptical casing design of all flanged pinch valves ensures minimum compressed air consumption. This results in energy savings and ensures a specified, lipped fold pattern to the sleeve of the air operated pinch valve.
This specific, lipped fold pattern ensures the complete sealing of the product flow. Even large solids are enclosed by the sleeve in the air operated Pinch Valve and are thus tightly sealed.
Versions:
A wide variety of materials for the casing, flanges, sockets and sleeve qualities reveal a very wide field of application for the air operated Pinch Valves
Maintenance:
Quick and simple replacement of all sleeve types with the assistance of detailed fitting instructions for the air operated Pinch Valves is reflected in the very low maintenance costs.
Industrial Sectors:
Air operated Pinch Valves are used in a variety of pneumatic conveying systems, such as the silos/cement sector, pigment and granulate handling, the ceramics/glass/plastics industries, waste water treatment, pharmaceuticals and foodstuffs industry, and winemaking. In addition, air operated Pinch Valves are used in metering and weighing systems, powder coating systems, vacuum toilet systems, vacuum conveying systems and vacuum and compressed air control units.
Mechanical Pinch Valves
The complete valve solution for isolating and regulating abrasive, corrosive and fibrous products such as granulates, powder, pellets, dust, slurries and suspensions.
Valve Function:
The sleeve of the mechanical Pinch Valve is controlled by a mechanism inside the casing and an actuator of your choice. The mechanism comprises one or two pinch bars arranged horizontally above and below the sleeve, and is guided at the side by two rods. Mechanical Pinch Valves can be provided with various actuators.
The actuator causes the pinch bar(s) to pinch the sleeve horizontally (centrally, depending on the nominal size). This provides an effective seal on the flow of product. In addition, a direct connection between the sleeve and the pinch bar(s) ensures an optimum opening of the sleeve to provide the full passage. The maximum operating pressure of the mechanical pinch Valve is dependant on the type and nominal size, and is between 3 and 40 Bar.
The most important advantages of the mechanical Pinch valve include the free flow of the product, minimum frictional resistance and low maintenance and operating costs. A further advantage of the mechanical Pinch Valve is the reduction of the parts in contact with the medium, the sleeve being the only component in contact with the product flow.
In addition, deformation of the sleeve during the closing process causes any incrustations inside the sleeve to break away. This means that the mechanical Pinch Valve is a practically blockage-free valve solution. Furthermore, even larger solid particles are shut off by the sleeve, which is particularly resistant to abrasion and corrosion, hence shut off without leaks.
Actuator variants available include manual actuation by means of a hand wheel or the automatic variant with double or single-acting pneumatic cylinders and electrical actuator drives. A wide variety of materials used in the casing and sleeve qualities open up a very wide field of application for mechanical Pinch Valves.
Maintenance:
The replacement of all sleeve types is quick and simple with the assistance of detailed fitting instructions, without the need for special tools. This is reflected in the very low maintenance and operating costs
Industrial Sectors:
Mechanical Pinch Valves are used in a variety of pneumatic conveying systems in the silos/cement sector, pigment and granulate handling, the ceramics/glass/plastics industry, water treatment and waste water treatment and in the pharmaceuticals and foodstuffs industry. Mechanical Pinch Valves are also very frequently used in the offshore/petroleum/cellulose/and paper industries, mining, metals and the chemical industry.
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