Pilot-Operated Control Valve — Acids
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LibertyCES has documented Pilot-Operated Control Valve in Acids service, including Sulfuric Acid and Nitric Acid. Wetted materials to confirm: ALD70 diaphragm. Documented models include Netafim 90 Series and Netafim 100 Series. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a free spec review.
Materials documented for this service
- ALD70 diaphragm (sulfuric acid limited to 38°C max)
- ALD70 Not Good for nitric acid even at 10%
- Hastelloy upgrade available for chlorine-based chemistries
Products cited for this service
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| ALD70 diaphragm — Sulfuric Acid | 38°C max, more restrictive than the body/liner material at the same acid concentration | Netafim Mining — Heap Leaching Products Catalog |
| ALD70 diaphragm — Nitric Acid | Rated "Not Good" even at 10% concentration | Netafim Mining — Heap Leaching Products Catalog |
| Netafim 100 Series pressure | 16 bar/230 psi or 25 bar/365 psi, metal body (cast iron/ductile iron/bronze/stainless) | Netafim Mining — Heap Leaching Products Catalog |
| Hastelloy upgrade | Available for chlorine-based chemistries where ALD70 is rated "Not Good" | Netafim Mining — Heap Leaching Products Catalog |
Because the 75/90/100 Series is diaphragm-actuated — the diaphragm both controls flow and seals the process fluid — a diaphragm rated "Not Good" for nitric acid even at 10% isn't a minor derate, it's a control-valve failure, not just a seal leak, worth flagging before ALD70 gets specified on any nitric-acid-adjacent leach line.
This valve doesn't open and close on command from a separate actuator bolted on top — it's a diaphragm-actuated hydraulic/electric control valve, meaning the ALD70 diaphragm is both the control element AND the wetted seal on a sulfuric leach line. That double duty is exactly why its 38°C ceiling matters more here than on a simple on/off actuated valve.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Can Pilot-Operated Control Valve handle Acids?
LibertyCES has documented Pilot-Operated Control Valve in Acids service.
What wetted materials should Pilot-Operated Control Valve use in Acids service?
Materials documented for this service: ALD70 diaphragm (sulfuric acid limited to 38°C max), ALD70 Not Good for nitric acid even at 10%, Hastelloy upgrade available for chlorine-based chemistries. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a spec review before final specification.
Which Acids chemicals does this cover?
Named chemicals in this documentation: Sulfuric Acid, Nitric Acid.
Which Pilot-Operated Control Valve models are documented for Acids?
Documented examples include Netafim 75 Series diaphragm-actuated hydraulic/electric control valve, Netafim 90 Series, Netafim 100 Series (cast iron / ductile iron / bronze / stainless, 16 bar/230 psi or 25 bar/365 psi).
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated