Pilot-Operated Control Valve

LibertyCES has documented Pilot-Operated Control Valve specified across 1 sector application, including Mining / Heap Leaching.

Netafim's 'MIN' mining configuration across 75/90/100 is an ALD70 diaphragm + SST 316 spring, with Hastelloy as an upgrade. The high-value finding lives here: the ALD70 chart rates sulfuric acid at only 38°C max — far more restrictive than the body/liner materials at the same acid — so on a sulfuric heap-leach quote the DIAPHRAGM is the limiting material, not the body. ALD70 is Not Good for nitric acid even at 10%, chlorine dioxide, and chlorine gas; Netafim's own catalog names Hastelloy as the substitute because it 'is resistant against chlorine gas, hypochlorite and chlorine dioxide solutions.' — examples include Netafim 75 Series diaphragm-actuated hydraulic/electric control valve (PP; 3/4"-4"R at 10 bar/145 psi, 3"H-8"R at 12 bar/175 psi, 60°C/140°F max), Netafim 90 Series (PVC body / PPS bonnet, 8-10 bar / 115-145 psi size-dependent, 40°C/104°F max), Netafim 100 Series (cast iron / ductile iron / bronze / stainless, 16 bar/230 psi or 25 bar/365 psi), Netafim Flushing Valve with Timer (PP 75 or PVC 90 body, 9V battery, IP67/NEMA 4X, 1-year+ autonomous). This is well-documented in LibertyCES's field data.

Netafim's own ALD70 diaphragm chemical-resistance chart rates sulfuric acid at only 38°C max — more restrictive than the body/liner material at the same acid, so on a sulfuric heap-leach quote the diaphragm elastomer is the limiting material, not the valve body. Real, sourced finding, not a generic acid-resistance claim. Materials to confirm: 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. Specific chemicals include Sulfuric Acid, Nitric Acid.