Non-Return Valves
A wide range of body and diaphragm materials can be supplied in different combinations as required to withstand the effects of corrosive and erosive fluids and gases.
Valves have been supplied to handle methane gas, corrosive acids and FeSi2-grit.
Can be used in Slurries, Mine drainage, Water supply, Cooling towers, Clean water, Acids and Alkalines.
Standard Valve Materials
Bodies: Cast SG Iron Grade 42 to BS 2789 420/12 or Grey Cast Iron to BS 1452/17.
Centre plates: Cast SG Iron Grade 42 to BS 2789 420/12 or Mild Steel to BS 4360 Grade 43A.
Diaphragms: Natural rubber specified by us according to DIN 53516 and ISO 4649.
Sizes & Pressure Ranges
The standard ranges are from 100NB to 600NB and for pressures of 16 bar, 25 bar and 40 bar.
Valves can be supplied in any size and for any operating pressure.
Pressure ranges: 1mm H2O up to 120 Bar.
Specifications & Standards
The valves are supplied to conform with any international specification standard, e.g. SABS, BS, ANSI, ISO, DIN.
Valves are manufactured and if required, tested in accordance with ISO 9001.
Operational Information
Diaphragm non-return valves
The valve make use of a central plate and rubber diaphragm to control flow. When the pump stops, the diaphragm contracts and seals against the boss at zero pressure, preventing reverse flow and water hammer.
Its soft rubber ensures a tight seal even with debris, operating silently and reliably for decades. The diaphragm—the only wearing part—absorbs pressure spikes, reducing system fatigue and maintenance for all components. While it eliminates surges in short pipelines, additional protection may be needed for very long systems.
STELKON
A durable, long lifespan solution, using patented rubber diaphragm, that reduces maintenance, downtime and operating costs.
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Workshop located @ Delmur, Lillydale Road, Modderrivier, 8700
