Rubber sleeves for pinch valve
Technical Specifications
Nominal diameter DN50-1200- Nominal pressure PN10, PN16, PN25, PN40
- Medium temperature -60 °C ... +200 °C
Product Description
Replacement rubber sleeves for pinch valves form the flexible flow passage that is compressed to regulate or isolate the process medium. A worn sleeve can be replaced without replacing the complete valve.
Zondex supplies sleeves for its pinch valve models 204M, 205M and 206M, as well as replacement sleeves for pinch valves from other manufacturers. The sleeve material, construction and dimensions are selected for the valve and its operating conditions.
Available configurations
| Sizes | DN 50–1200, depending on the valve and sleeve design. |
| Pressure ratings | PN 10, PN 16, PN 25 and PN 40, depending on the valve configuration. |
| Valve compatibility | Zondex models 204M, 205M and 206M; replacement sleeves for other pinch valve brands sleeves can be easily used. |
| Flange connections | Sleeve ends and bolt drilling can be matched to EN 1092-1 or ASME flange connections: ASME B16.5 or ASME B16.47, as applicable to the size. |
| Sleeve construction | Inner diameter, length, reinforcement, end geometry and mounting features selected for the specific valve. |
How the sleeve is constructed
Depending on the design, a sleeve can combine an inner layer selected for contact with the process medium, a reinforcement layer for pressure and repeated operation, and an outer layer that supports the sleeve within the valve.
Opening tabs or other mounting features can be incorporated where required by the valve mechanism. The sleeve’s end geometry, bolt drilling, length and inner diameter must match the specific valve; nominal size alone does not establish interchangeability.
Sleeve material selection
| Rubber compound | Application examples | Reference temperature range | Typical media |
|---|---|---|---|
| NR Natural rubber | High-wear slurry service | −40°C to +75°C | Mineral slurries, sand-laden water and other abrasive water-based media |
| NRL Wet natural rubber | Highly abrasive slurry applications | −40°C to +75°C | Ore pulp and mineral suspensions |
| NR + Linatex Natural rubber with specified lining | Severe abrasive service where this lining is specified | −40°C to +85°C | Sand, coal and abrasive mineral suspensions |
| NBR Nitrile rubber | Applications involving oils and hydrocarbons | −30°C to +100°C | Mineral oils, fuels, lubricants and oily water |
| HNBR Hydrogenated nitrile rubber | Higher-temperature duties involving compatible oils | −30°C to +160°C | Oils, fuels and lubricants |
| EPDM Ethylene propylene rubber | Water-based and selected chemical applications | −40°C to +120°C | Water, salt solutions and compatible acids or alkalis |
| SBR Styrene-butadiene rubber | Abrasive, water-based duties | −40°C to +100°C | Contaminated water and mineral suspensions |
| SBRT Special styrene-butadiene compound | High-wear applications with frequent operating cycles | −40°C to +110°C | Abrasive, water-based media and compatible dilute chemical solutions |
| CR Chloroprene rubber | Selected chemical applications; resistance to weathering and ozone | −40°C to +100°C | Compatible chemicals, oils and lubricants |
| CSM Chlorosulfonated polyethylene | Selected chemical applications; resistance to weathering and ozone | −40°C to +100°C | Compatible acids, chemical solutions and oils |
| IIR Butyl rubber | Selected chemical applications requiring low gas permeability | −40°C to +100°C | Compatible acids and other process chemicals |
| FPM / FKM Fluoroelastomer | Selected chemical applications and elevated temperatures | −20°C to +120°C | Compatible hydrocarbons, oils and chemical media |
| PU Polyurethane or PU-lined sleeve | Selected abrasive applications | −10°C to +80°C | Abrasive materials and compatible process liquids |
| NRF Food-grade natural rubber | Food-process applications, subject to documentation for the supplied compound | −40°C to +75°C | Compatible food-process media |
| NBRF Food-grade nitrile rubber | Food-process duties involving fats or oils, subject to compound documentation | −30°C to +100°C | Compatible vegetable and animal oils and fats |
The temperature ranges are material references, not guaranteed limits for every finished sleeve. Final selection depends on the rubber formulation, sleeve construction, medium composition and concentration, pressure and operating cycle. Food-contact suitability must be supported by documentation for the specific compound supplied.
Applications
Replacement sleeves can be specified for mineral slurries, sand-laden water, flotation and dewatering circuits, wastewater sludge, powders and other media containing solids. For oils, chemicals and mixed media, the sleeve material is selected according to the actual process conditions.
Information needed for a replacement sleeve
Please provide the valve manufacturer, model and serial number, or a drawing or sample of the existing sleeve. Specify the valve size and pressure rating (DN/PN or NPS/Class), flange standard and drilling, sleeve length, inner diameter, process medium, operating temperature and pressure. Photographs of the existing sleeve are helpful when original documentation is unavailable.
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