 Valves
 PREMAFLEX
Pinch Valves
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Operation
By pressing additional compressed air or water into the Premaflex Pinch Valve casing, a special, highly elastic collar is compressed. This will close the collar and will absolutely block the stream of material, even if it contains pieces of solid material.
 Due to the highly elastic collar, the valve's functionality will be maintained even with frequent switching. After switching off the control medium, the collar will automatically reopen on account
of its adaptive quality.
Resistance to chemicals (waste water, caustic and acid liquids), resistant to fire and temperatures from -20°C to +120°C (depending on the gasket material).
As an alternative to the valves operated by means of additional compressed air, we can also offer valves that are opened and closed manually.
Advantages
Light weight, offering a high degree of solidity, resistant to chemicals
High Service Reliability
The structure of this valve is simple throughout and ensures perfect closing and opening - even with media that contain a high proportion of solid materials and dirt. Since either compressed air or water are used as control media; these valves are therefore not dangerous and may even be installed in highly explosive systems.
Ideal under all Operating Conditions
Premaflex Pinch Valves may be used for dust, for pourable and pulpy media and also for liquid and gaseous materials. Due to the special structure of the gasket, a hose may be closed at an even level to the central axis. Tight closure is ensured, even with frequent opening and closing.
Advantage during Installation
The robust and compact structure permits installation under the most difficult conditions and with very limited space.
The highly elastic Gasket
will close absolutely tight, even with solid particles included in the medium and even with a very high number of switchings. This valve is available in various qualities depending on operating conditions.
Simple and inexpensive Replacement of the Gasket
Selecting the best suited material
Due to the respective operating conditions, specific qualities are required for the material. Various materials and sizes are available and may be combined with each other.
A large variety of materials, types of connections and gasket qualities offer a considerable range of applications.
Technical Specifications
| Valve Casing: |
Grey cast iron and/or aluminium
Special execution in GGG 40 - Certificate of Approval DIN 3.1B is available |
| Valve Flanges: |
Grey cast iron, steel, aluminium,
Stainless steel, or grey cast iron with bushings in stainless steel. |
| Flange Connection: |
DN 40 - DN 150 pursuant to DIN 2633 PN 10/16 - Form C
DN 200 pursuant to DIN 2632 PN 10 - Form C |
| Connection for control air: |
3/8" inside thread |
| Max. permitted operating pressure: |
4 - 6 bar |
| Max. permitted pressure of control air: |
1,8 - 2,0 bar above the respective operating pressure |
| Permitted test pressure: |
10 bar |
Gasket Qualities
| Natural Rubber* |
< 80°C |
| Neoprene*, NBR*, Buna S, Viton |
< 100°C |
| EPDM* |
< 120°C |
* Gaskets are also available in food-processing quality.
Special Designs and Accessories
Directly impinged crimp valves of the type PQV with:
- Control and monitoring units
(magnetic valve, manometric switch, pressure regulator, filter, compressed-air accumulator, etc).
- Silo overload cut-outs
(control units plus dummy- and fixed couplings with accessories System STORZ)
- Concomitant electrical heating
(heating cables, insulation)
Hand-wheel Pinch Valves, Type QVH
Pinch Valves with electric drive, Type QVE
Safety Pinch Valves, Type QVS
(Spring-closed/-opened by compressed air or spring-opened/closed by compressed air)
Sizes and Mounting Measurements
We would be pleased to send you measurements for other valve types upon request.
Special designs and accessories are available upon request.
Please do not hesitate to contact us for additional information.
Your contact: Mr. Wolfgang Körber, Phone: +49 6172 67 78-53, E-mail: wolfgang.koerber@prema-service.de
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