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How do you find the right sleeve for your pinch valve?
As the sleeve is responsible for performing the main task in a pinch valve – namely opening and closing the valve – one of the most important aspects for ensuring that the entire pinch valve can be used efficiently for its intended task is selecting the correct elastomer quality.
Therefore, it is important to consider both the chemical resistance and also the minimum and maximum operating temperatures when selecting the ideal elastomer quality for the sleeve.
Contents:
► Chemical resistance
► Operating temperatures
► Available elastomer qualities
► Request form
1. Chemical resistance
We have compiled some links to elastomer databases below.
You can use these databases to check the resistance of the different elastomer qualities to your pumped media.
Resistance list [Jäger Group] Resistance list [NDS Seals] Resistance list [DuPont]
To ensure that the relevant elastomer is suitable for the pumped media, the media should only have a minor effect on the elastomer with a maximum volume swell of up to 10%.
Depending on the supplier, the recommended classifications are labelled as follows:
- A or B
- 1 or 2
- + or 0
- "Very resistant" or "Resistant"
If you cannot find your operating medium in any of the chemical resistance lists, please don’t hesitate to contact us at any time with the relevant details about your operating medium.
NOTE:
Please be aware that the estimates or recommendations for the general chemical resistance of the elastomers found in these lists and databases only refer to theoretical studies of contact with the operating medium – without any consideration for the varying dynamic loads placed on the pinch valve sleeves.
Recommendation: Please check with us to see if we have any empirical values for your application and/or your operating medium.
If we do not have any empirical values, it is vital to carry out tests using the selected pinch valve sleeves and pinch valves under real operating conditions.
We would be pleased to support you with our full expertise and experience and supervise your tests until the final results have been determined.
2. Operating temperatures
Alongside the chemical resistance of the elastomers, it is also important to compare the permissible operating temperatures for the different qualities of sleeve elastomer with the temperatures found in your application.
Please note here that the operating temperatures for AKO pinch valve sleeves comply with the general recommendations given for the operating temperatures of the different elastomer qualities.
NOTE:
Please note that not all sleeve qualities are suitable for applications with high cycles or frequent intervals.
Please don’t hesitate to contact us about your specific requirements.
Thanks to our more than 35 years of experience, we can usually give you a realistic estimate of the expected service life of the sleeves in cycles.
3. Sleeve qualities from AKO Armaturen
AKO Armaturen can provide you with a large selection of different sleeve qualities as standard.
Alongside special elastomer compounds designed for use with foodstuffs, we can also provide you with conductive sleeve qualities that are suitable for use in Ex zones (potentially explosive atmospheres) due to their electrical conductivity.
| Material code | Designation | AKO-Code | Temp. (min.) |
Temp. (max.) |
Differential pressure (min., ca.) *** |
|---|---|---|---|---|---|
| CR | Neoprene | 01X | -10° C | 100° C | 2,0 - 3,0 bar |
| NR - LW | Natural rubber (food, pale) | 02X | -10° C | 80° C | 2,0 - 2,5 bar |
| NR - LS | Naturak rubber (food, black) | 02LS | -10° C | 80° C | 2,0 - 3,0 bar |
| NR | Natural rubber (abrasion-resistant) | 03X | -10° C | 80° C | 2,0 - 2,5 bar |
| NR - H | Natural rubber (high temperature) | 03X | -10° C | 100° C | 2,5 - 3,0 bar |
| EPDM - HTEC | EPDM / EPDM (food, black) | 04HTEC | -10° C | 90° C * | 2,5 - 3,0 bar |
| EPDM - HTEC (EHEDG) | EPDM / EPDM (food, black, EHEDG conform) | 04HTECE | -10° C | 90° C * | 2,5 - 3,0 bar |
| EPDM - LW | EPDM (food. pale) | 04LW | -10° C | 90° C | 2,5 - 3,0 bar |
| FPM / FKM | Viton | 05 | -10° C | 120° C | 4,0 bar |
| Q | Silicone | 06 | -10° C | 130° C | 3,0 bar |
| NBR | Nitrile | 07X | -10° C | 100° C | 2,0 - 3,0 bar |
| NBR - LS | Nitrile (food, black) | 07LS | -10° C | 80° C | 2,0 - 3,0 bar |
| NBR - LW | Nitrile (food, pale) | 07LW | -10° C | 80° C | 2,0 - 3,0 bar |
| CSM | Hypalon | 08X | -10° C | 100° C | 2,0 - 3,0 bar |
| IIR | Butyl | 09X | -10° C | 90° C | 2,0 - 3,0 bar |
* Short-term application of +120 °C and SIP cleaning possible!
*** See the technical information sheet "Optimal control pressure"
| Material code | Designation | AKO-Code | Temp. (min.) |
Temp. (max.) |
Differential pressure (min., ca.) *** |
|---|---|---|---|---|---|
| NR - LF | Natural rubber (electrically conductive) | 03LF | -10° C | 80° C | 2,0 - 3,0 bar |
| EPDM - HTECLF | EPDM (food, black, electrically conductive) | 04HTECLF | -10° C | 90° C * | 2,5 - 3,0 bar |
| NBR - LF | Nitrile (electrically conductive) | 07LF | -10° C | 70° C | 2,0 - 3,0 bar |
* Short-term use at 120° C and SIP cleaning possible!
*** See the technical information sheet "Optimal control pressure"
Ask about the sleeve quality for your application
We would be pleased to advise you on the ideal sleeve quality for your application.
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Widest pinch valve product range
10 000 pinch valve variants
2 500 variants available ex stock
100 000 units sold each year
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